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©
2002 Maxtor Corporation. All rights reserved. Printed in U.S.A.
This publication could include technical inaccuracies or typographical errors. Changes are periodically made to the information
herein – which will be incorporated in revised editions of the publication. Maxtor may make changes or improvements in the prod-
uct(s) described in this publication at any time and without notice.
UL standard 1954 recognition granted under File No. E78016
CSA standard C22.2-950 certification granted under File No. LR49896
TUV Rheinland EN 60 950
Tested to FCC Rules for Radiated and Conducted Emissions, Part 15, Sub Part J, for Class-B Equipment.
These products are covered by or licensed under one or more of the following U.S. Patents:
4,419,701; 4, 538,193 4,625,109; 4,639,798; 4,647,769; 4,647,997; 4,661,696; 4,669,004; 4,675,652; 4,703,176; 4,730,321;
4,772,974; 4,783,705; 4,819,153; 4,882,671; 4,920,442; 4,920,434; 4,982,296; 5,005,089; 5,027,241; 5,031,061; 5,084,791;
5,119,254; 5,160,865; 5,170,229; 5,177,771; Other U.S. and Foreign Patents Pending.
®
®
®
Maxtor , MaxFax and No Quibble Service are registered trademarks of Maxtor Corporation, registered in the U.S.A. and other
countries. Maxtor Atlas, DisCache, WriteCache are trademarks of Maxtor Corporation. All other brand names or trademarks are
the property of their manufacturers.
Maxtor reserves the right to make changes and improvements to its products, without incurring any obligation to incorporate such
changes or improvements into units previously sold or shipped.
This product or document is protected by copyright and distributed under licences restricting its use, copying, distributing, and
decompilation. No part of this product or document may be reproduced in any form by any means without prior written authoriza-
tion of Maxtor and its licensors, if any.
RESTRICTED RIGHTS LEGEND: Use, duplication, or disclosure by the government is subject to restrictions as set forth in sub-
paragraphs (c)(1)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013 and FAR 52.227-19.
THIS PUBLICATION IS PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTI-
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Publication Number: 81-126196-01
Corporate Headquarters
510 Cottonwood Drive
Milpitas, California 95035
Tel: 408-432-1700
Fax: 408-432-4510
Research and Development Center
333 South Street
Shrewsbury, MA 01545
Tel: 1-800-2-MAXTOR
Thank you for your interest in Maxtor hard disk drives. This manual provides technical information for OEM engineers and sys-
tems integrators regarding the installation and use of Maxtor hard drives. Drive repair should be performed only at an authorized
repair center. For repair information, contact the Maxtor Customer Service Center at 800-2MAXTOR or 408-922-2085.
CAUTION: Maxtor hard drives are precision products. Failure to follow these precautions and guidelines outlined here may
lead to product failure, damage and invalidation of all warranties.
1
BEFORE unpacking or handling a drive, take all proper electro-static discharge (ESD) precautions, including
personnel and equipment grounding. Stand-alone drives are sensitive to ESD damage.
2
3
4
BEFORE removing drives from their packing material, allow them to reach room temperature.
During handling, NEVER drop, jar, or bump a drive.
Once a drive is removed from the Maxtor shipping container, IMMEDIATELY secure the drive through its mount-
ing holes within a chassis. Otherwise, store the drive on a padded, grounded, antistatic surface.
5
6
NEVER switch DC power onto the drive by plugging an electrically live DC source cable into the drive's connector.
NEVER connect a live bus to the drive's interface connector.
ELECTRICAL GROUNDING - For proper operation, the drive must be securely fastened to a device bay that pro-
vides a suitable electrical ground to the drive baseplate.
Please do not remove or cover up Maxtor factory-installed drive labels. They contain information required should the drive ever
need repair.
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1.1 AUDIENCE....................................................................................................................... 1-1
1.2 MANUAL OR GANIZATION .......................................................................................... 1-1
1.3 TERMINOLOGY AND CONVENTIONS ..................................................................... 1-2
1.4 REFERENCES .................................................................................................................. 1-3
2.1 PR ODUCT OVER VIEW ................................................................................................. 2-1
2.2 KEY FEATURES............................................................................................................... 2-1
2.3 Regulatory Compliance Standards ....................................................................................... 2-3
2.4 HARDWARE REQUIREMENTS ................................................................................... 2-4
3.1.1 Safety Precautions .......................................................................................................3-1
3.1.3 Electrostatic Discharge (ESD) Protection ....................................................................3-2
3.2 SPACE REQUIREMENTS............................................................................................... 3-3
3.2.1 Shock Feet .................................................................................................................3-4
3.3 UNPACKING INSTR UCTIONS .................................................................................... 3-4
3.4 HARDWARE OPTIONS ................................................................................................. 3-6
3.4.1 Configuration Jumpers and Connections .....................................................................3-6
3.4.2 Jumper Options on the 68-Pin Wide PCB ................................................................3-6
3.4.3 SCA-2 80-Pin Connector Versions ...........................................................................3-10
3.4.4 Jumper J7 on the 80-Pin SCA PCB ..........................................................................3-14
3.5 INTERFACE CONNECTOR (J1)................................................................................... 3-15
3.5.1 68-pin Wide SCSI Connector - LVD .......................................................................3-16
3.5.2 80-pin SCA-2 SCSI Connector - LVD .....................................................................3-17
3.5.3 68-Pin Wide Single-Ended SCSI Connector ............................................................3-19
3.5.4 80-pin SCA-2 Single-Ended SCSI Connector ..........................................................3-20
3.6 4-pin DC Power Connector (68-Pin Connector) ............................................................... 3-21
3.7 4-pin Mating Connector .................................................................................................... 3-21
3.8 J1 12-pin Auxiliary Connector (68-pin Connector) ............................................................ 3-22
3.9 DRIVE MOUNTING and installation .............................................................................. 3-23
3.9.1 Orientation ...............................................................................................................3-23
3.9.2 Mounting Screw Clearance .......................................................................................3-24
Maxtor Atlas 10K III
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Table of Contents
3.9.3 Shock Clip ...............................................................................................................3-25
4.1 SPECIFICATION SUMMARY ......................................................................................... 4-1
4.2 FOR MATTED CAPACITY............................................................................................... 4-3
4.3 DATA TRANSFER RATES .............................................................................................. 4-4
4.4 TIMING SPECIFICATIONS ............................................................................................. 4-4
4.5 POWER .............................................................................................................................. 4-5
4.5.1 Power Sequencing ......................................................................................................4-5
4.5.2 Power Reset Limits ....................................................................................................4-5
4.5.3 Drive Power Dissipation .............................................................................................4-6
4.6 ACOUSTICS ...................................................................................................................... 4-7
4.6.1 Acoustic Tonal Quality ...............................................................................................4-7
4.7 MECHANICAL.................................................................................................................. 4-8
4.8 ENVIRONMENTAL CONDITIONS............................................................................... 4-8
4.9 ELECTROMAGNETIC CONDITIONS .......................................................................... 4-9
4.9.1 EMI/ RFI Susceptibility ..............................................................................................4-9
4.9.2 Sensitivity to Magnetic Fields .....................................................................................4-9
4.10 SHOCK AND VIBRATION............................................................................................ 4-10
4.11 RELIABILITY .................................................................................................................. 4-10
4.12 DISK ER ROR S................................................................................................................ 4-11
5.1 Overview of the SCSI Command Descriptions..................................................................... 5-1
5.2 Command Descriptor Block................................................................................................. 5-3
5.3 Status/ Error Reporting......................................................................................................... 5-6
5.4 Auto Contingent Allegiance Condition and Contingent Allegiance Condition ..................... 5-7
5.5 Extended Contingent Allegiance Condition ......................................................................... 5-8
5.6 Linked Commands............................................................................................................... 5-9
5.7 DATA Transfer Command Components............................................................................ 5-10
5.8 SCSI COMMAND DESCRIPTIONS .............................................................................. 5-12
5.9 CHANGE DEFINITION Command (40h)....................................................................... 5-13
5.10 FOR MAT UNIT Command (04h).................................................................................... 5-14
5.10.1 Five Forms of FORMAT UNIT Commands ..........................................................5-16
5.10.2 FORMAT UNIT Parameter List ............................................................................5-16
5.11 INQUIRY Command (12h).............................................................................................. 5-20
5.11.1 Standard Inquiry Data Page .....................................................................................5-21
5.11.2 Vital Product Data Pages .........................................................................................5-23
5.12 LOG SELECT Command (4Ch)........................................................................................ 5-36
5.13 LOG SENSE Command (4Dh).......................................................................................... 5-37
5.13.1 LOG SENSE Command Descriptor Block ..............................................................5-38
5.13.2 LOG SENSE Log Pages ..........................................................................................5-39
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5.14 MODE SELECT (6) Command (15h)................................................................................ 5-41
5.14.3 Mode Parameter List ...............................................................................................5-44
5.15 MODE SELECT (10) Command (55h).............................................................................. 5-73
5.16 MODE SENSE (6) Command (1Ah) ................................................................................. 5-75
5.16.1 R ead-Only Mode Pages ..........................................................................................5-77
5.16.4 Margin Control Subpage .........................................................................................5-82
5.16.6 Negotiated Settings Subpage ....................................................................................5-84
5.17 MODE SENSE (10) Command (5Ah) ............................................................................... 5-86
5.18 PERSISTENT RESERVATION IN Command (5Eh)...................................................... 5-88
5.19 PERSISTENT RESERVATION OUT Command (5Fh) ................................................. 5-96
5.20 READ (6) Command (08h).............................................................................................. 5-106
5.21 READ (10) Command (28h)............................................................................................ 5-107
5.22 READ BUFFER Command (3Ch).................................................................................. 5-108
5.23 READ CAPACITY Command (25h) .............................................................................. 5-110
5.24 READ DEFECT DATA Command (10) (37h)................................................................ 5-111
5.25 READ DEFECT DATA Command (12) (B7h) ............................................................... 5-114
5.26 READ LONG Command (3Eh) ...................................................................................... 5-117
5.27 READ SKIP MASK Command (E8h).............................................................................. 5-119
5.28 REASSIGN BLOCKS Command (07h)........................................................................... 5-120
5.29 RECEIVE DIAGNOSTIC RESULTS Command (1Ch)................................................. 5-122
5.29.2 Translate Address Page (40h) .................................................................................5-124
5.30 RELEASE (6) Command (17h)........................................................................................ 5-126
5.31 RELEASE (10) Command (57h)...................................................................................... 5-127
5.32 REPORT DEVICE IDENTIFIER Command (A3h) ...................................................... 5-129
5.33 REPORT LUNS Command (A0h) ................................................................................. 5-131
5.34 REQUEST SENSE Command (03h)............................................................................... 5-132
5.34.1 Sense Data Availability ...........................................................................................5-133
5.34.2 Status Reporting ....................................................................................................5-134
5.34.3 Sense Data Format for Error Code 70h and Error Code 71h ..................................5-135
5.35 RESER VE (6) Command (16h)....................................................................................... 5-155
5.36 RESER VE (10) Command (56h)..................................................................................... 5-156
5.37 REZERO UNIT Command (01h) .................................................................................. 5-158
5.38 SEEK (6) Command (0Bh)............................................................................................... 5-159
5.39 SEEK (10) Command (2Bh)............................................................................................. 5-160
5.40 SEND DIAGNOSTIC Command (1Dh)......................................................................... 5-161
5.40.1 Supported Diagnostic Page List ..............................................................................5-163
5.40.2 Translate Address Page ...........................................................................................5-164
5.41 SET DEVICE IDENTIFIER Command (A4h)................................................................ 5-165
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5.42 START STOP UNIT Command (1Bh) .......................................................................... 5-166
5.43 SYNCHRONIZE CACHE Command (35h).................................................................. 5-167
5.44 TEST UNIT R EADY Command (00h) .......................................................................... 5-168
5.45 VER IFY Command (2Fh) ............................................................................................... 5-169
5.46 WR ITE (6) Command (0Ah)........................................................................................... 5-170
5.47 WR ITE (10) Command (2Ah)......................................................................................... 5-171
5.48 WR ITE AND VERIFY Command (2Eh) ....................................................................... 5-172
5.49 WR ITE BUFFER Command (3Bh) ................................................................................ 5-173
5.50 WR ITE LONG Command (3Fh) .................................................................................... 5-175
5.51 WR ITE SAME Command (41h) ..................................................................................... 5-176
5.52 WR ITE SKIP MASK Command (EAh)........................................................................... 5-177
6.1 KEY FEATURES................................................................................................................ 6-1
6.2 PR EFETCH ........................................................................................................................ 6-2
6.3 WR ITE-BACK CACHING................................................................................................ 6-3
6.4 ZERO LATENCY R EAD/ WR ITE................................................................................... 6-3
6.5 DISCONNECT-RECONNECT ....................................................................................... 6-3
6.6 TRACK AND CYLINDER SKEWING ............................................................................ 6-3
6.7 AVER AGE ACCESS TIME................................................................................................ 6-4
6.8 EMBEDDED SER VO SYSTEM......................................................................................... 6-4
6.9 DATA INTEGR ITY AND SECUR ITY ............................................................................ 6-4
6.9.1 Media Error Protection ...............................................................................................6-4
6.9.2 Transfer Error Protection ............................................................................................6-4
6.9.3 Addressing Error Protection ........................................................................................6-4
6.9.4 Data Sector Reallocation Error Protection ..................................................................6-5
6.9.5 Data Verification ........................................................................................................6-5
6.10 TAGGED COMMAND QUEUING.................................................................................. 6-5
6.11 COMMAND R EORDER ING .......................................................................................... 6-5
6.12 BANDED RECORDING .................................................................................................. 6-6
6.13 SPECIAL FUNCTIONS..................................................................................................... 6-6
6.14 POWER MANAGEMENT ................................................................................................ 6-6
6.15 DIAGNOSTICS.................................................................................................................. 6-6
6.15.1 Power On Self Test (POST) ......................................................................................6-7
6.15.4 Log Sense ..................................................................................................................6-8
6.16 ERROR RECOVERY ...................................................................................................... 6-8
6.16.2 Data Read Errors .......................................................................................................6-8
6.17 SCSI CONFIGURED AUTOMATICALLY (SCAM)........................................................ 6-9
(LVD) SCSI INTERFACE ................................................................................................... 6-9
viii Maxtor Atlas 10K III
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Table of Contents
6.18.1 DIFFSENS ..............................................................................................................6-10
6.18.2 DIFFSENS SWITCHING ......................................................................................6-10
6.18.3 DT AND ST CLOCKING .....................................................................................6-11
6.18.4 CYCLIC R EDUNDANCY CHECKING .............................................................6-12
6.18.5 DOMAIN VALIDATION .....................................................................................6-12
6.18.7 Transmitter Pre-Compensation with Cutback ..........................................................6-13
6.18.8 Free Running Clock (FRC) ....................................................................................6-13
6.18.9 Skew Compensation ................................................................................................6-13
6.19.1 System Considerations .............................................................................................6-14
A.1 SCSI-2/ SCSI-3 Equivalent Terminology ............................................................................ A-1
A.2 SCSI Commands and Messages............................................................................................ A-2
A.3 SCSI Pages .......................................................................................................................... A-3
A.4 Sense Keys .......................................................................................................................... A-5
A.5 Status Codes........................................................................................................................ A-5
B.1 TRANSFER PERIOD FACTOR FIELD.......................................................................... B-1
B.2 Settings for the QAS, DT, and IU fields .............................................................................. B-2
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Figure 3-1 Dimensions for the Maxtor Atlas 10K III Hard Disk Drives............................... 3-3
Figure 3-2 Drive Packing Assembly .................................................................................... 3-5
Figure 3-3 Jumper Locations on the 68-Pin Wide SCSI Drive PCB ................................... 3-7
Figure 3-4 Termination Power Circuitry .......................................................................... 3-10
Figure 3-5 Pin Locations on SCA-2 Connector ................................................................ 3-11
Figure 3-6 J7 Jumper Location on the 80-Pin SCA PCB .................................................. 3-14
Figure 3-7 J1 Interface Connector Configurations............................................................. 3-15
Figure 3-8 Mounting Dimensions Maxtor Atlas 10K III Drives......................................... 3-23
Figure 3-9 Mounting Screw Clearance for Maxtor Atlas 10K III Drive............................. 3-24
Figure 3-10 Lengthwise Airflow Cooling............................................................................ 3-25
Figure 3-11 Crosswise Airflow Cooling.............................................................................. 3-26
Figure 6-1 ST and DT CLocking ..................................................................................... 6-11
Maxtor Atlas 10K III
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Table 5-18
Power R eset Limits1 ................................................................................... 4-5
Environmental Specifications ....................................................................... 4-8
Shock and Vibration Specifications ............................................................ 4-10
Error R ates................................................................................................ 4-11
Supported SCSI Commands ........................................................................ 5-1
Status Codes ................................................................................................ 5-6
Length Fields ............................................................................................. 5-10
FOR MAT UNIT Defect Descriptor- Physical Sector and Bytes
From Index Format ................................................................................... 5-18
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Vital Product Data-Page Codes ................................................................. 5-23
Disk Drive Log Pages ................................................................................ 5-37
Mode Page Types...................................................................................... 5-43
Categories of Changeable Pages................................................................. 5-46
Maxtor Atlas 10K III
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Caching Page-(Page 8)............................................................................... 5-53
Caching Page-(Page 8)............................................................................... 5-54
Port Control Page Short Format ................................................................ 5-60
R ead-Only Mode Pages ............................................................................ 5-77
Margin Control Subpage (01h) .................................................................. 5-82
Bus Mode.................................................................................................. 5-84
Descriptor Block-Data Format................................................................... 5-88
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Descriptor-Data Format............................................................................. 5-91
Descriptor-Field Descriptions .................................................................... 5-92
New Reservations Exist............................................................................. 5-94
Descriptor Block-Data Format................................................................... 5-96
Service Action Descriptions....................................................................... 5-98
Parameter List-Field Descriptions............................................................. 5-104
Description R EAD DEFECT.................................................................. 5-112
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Descriptor Block-Data Format................................................................. 5-122
Descriptor Block-Field Descriptions......................................................... 5-122
Descriptor Block-Data Format................................................................. 5-129
Descriptor Block-Field Descriptions......................................................... 5-130
Supported Sense Keys .............................................................................. 5-137
Bytes\ Field Descriptions .......................................................................... 5-153
R etry Count-Data Format....................................................................... 5-153
Sense Key - R etry Count ........................................................................ 5-154
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R eservation Types................................................................................... 5-157
Block-Field Descriptions ......................................................................... 5-165
Maxtor Atlas 10K III xvi
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This chapter gives an overview of the contents of this manual, including the intended
audience, how the manual is organized, terminology and conventions, and references.
The Maxtor Atlas 10K III Product Manual is intended for reference by original
equipment manufacturers (OEMs) that are integrating the disk drive into a system or
subsystem, developers, and disk drive installers. Its primary audience is the OEM
technical staff that makes disk drive purchase and configuration decisions, and system
integrators that are responsible for the SCSI interface. This manual is not intended for
end-users and is not a users manual or an installation guide. The manual provides
information about installation, interface command implementation, maintenance, and
gives the general specifications of the drive.
This manual is organized into the following chapters:
• Chapter 1 – About This Manual
• Chapter 2 – General Description
• Chapter 3 – Installation
• Chapter 4 – Specifications
• Chapter 5 – SCSI Description
• Chapter 6 – Feature Descriptions
• Appendix A – Quick R eference
• Appendix B – Negotiated Page Information Page R eference
• Glossary
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About This Manual
In the Glossary at the back of this manual, you can find definitions for many of the
terms used in this manual. In addition, the following abbreviations are used in this
manual:
• ASIC
• Kbpi
• dB
application-specific integrated circuit
thousands of bits per inch
decibels
• dBA
• ECC
• Kfci
• Gbit
• GB
decibels, A weighted
error correcting code
thousands of flux changes per inch
gigabit
gigabyte
• Hz
hertz
• KB
kilobytes
• LSB
• LVDS
• mA
• MB
least significant bit
low voltage differential SCSI
milliamperes
megabytes (1 MB = 1,000,000 bytes when referring to disk
transfer rates or storage capacities and 1,048,576 bytes in all
other cases)
• Mbit/ s
• MB/ s
• MHz
• ms
megabits per second
megabytes per second
megahertz
milliseconds
• MSB
• mV
• ns
most significant bit
millivolts
nanoseconds
• SCSI
• tpi
Small Computer System Interface
tracks per inch
microseconds
• µs
• V
volts
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About This Manual
The typographical and naming conventions used in this manual are listed below.
Conventions that are unique to a specific table appear in the notes that follow that
table.
Typographical Conventions:
• Names of Bits: Bit names are presented in initial capitals. An example is
the Host Software Reset Bit.
• Commands: Firmware commands are listed as all capitals. An example is
MODE SELECT.
• Parameters: Parameters are given as initial capitals when spelled out, and
are given as all capitals when abbreviated. Examples are Prefetch Enable
(PE) and Cache Enable (CE).
• Hexadecimal Notation: The hexadecimal notation is given in 9-point
subscript form. An example is 30H.
• Signal Negation: A signal that is non-active or is in its non-asserted state.
• Messages: A message that is sent from the drive to the host is listed in all
capitals. An example is BUS DEVICE R ESET.
Naming Conventions:
• Host: In general, the system in which the drive resides is referred to as
the host.
• Computer Voice: This refers to items you type at the computer
keyboard. These items are listed in 10-point, all capitals, Courier font.
An example is FORMAT.
For additional information about the SCSI interface, refer to:
• ANSI Small Computer System Interface-2 (SCSI-2) Specification, ANSI
X3T9.2/ 86-109, R evision 10k.
• ANSI Small Computer System Interface-3 (SCSI-3) Specification, ANSI
X3T10, August 1994.
• SPI-3 Specification Revision 6
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About This Manual
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This chapter summarizes the general functions and key features of the Maxtor
Atlas 10K III family of hard disk drives, as well as the applicable standards and
regulations.
Maxtor Atlas 10K III hard disk drives are part of a family of high performance, 1-inch-
high hard disk drives manufactured to meet the highest product quality standards.
There are currently three models in the Maxtor Atlas 10K III series with capacities of
18.4, 36.7, and 73.4 gigabytes (GB). These hard disk drives use nonremovable,
3 1/ 2-inch hard disks and are available with the following SCSI configurations:
• Ultra160 SCSI, Ultra2, Ultra SCSI 68-pin Wide (16-bit)
• Ultra160 SCSI, Ultra2, Ultra SCSI 80-pin SCA-2 (16-bit)
• Ultra320 SCSI, Ultra2, Ultra SCSI 68-pin Wide (16-bit)
• Ultra320 SCSI, Ultra2, Ultra SCSI 80-pin SCA-2 (16-bit)
The Maxtor Atlas 10K III hard disk drives feature an embedded SCSI drive controller
and use SCSI commands to optimize system performance. Because the drive manages
media defects and error recovery internally, these operations are fully transparent to
the user.
The innovative design of the Maxtor Atlas 10K III hard disk drives enables Maxtor to
produce a family of low-cost, high-reliability drives.
The Maxtor Atlas 10K III hard disk drive includes the following key features:
General
• Formatted storage capacity of 18.4 GB (1 disk, 2 heads), 36.7 GB (2 disks,
4 heads), and 73.4 (4 disks, 8 heads).
• Low profile, 1-inch height
• Industry standard 3 1/ 2-inch form factor
• Embedded SCSI controller
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General Description
Performance
• Average seek time of 4.5 ms for reads and 5.0 ms for writes
• 10,000 RPM rotational speed
• Average rotational latency of 3 ms
• 8 MB SDRAM buffer. Look-ahead DisCache feature with continuous
prefetch and WriteCache write-buffering capabilities
• R ead-on-arrival firmware
• Tagged Command Queuing with Reordering (ORCA™)
• ECC on-the-fly
• Highly automated SCSI protocol (including Auto Read/ Write)
• 1:1 interleave on read/ write operations
• High performance Ultra160 SCSI or Ultra320 SCSI interface
• SCSI-2, and SCSI-3 supported
• Ultra-2 SCSI-3 LVDS transfer rates supported
• Fast Ultra and Ultra-2 SCSI transfer rates supported (SCSI-3 compliant)
• S.M.A.R.T. 2 (Self-Monitoring, Analysis and Reporting Technology)
• SCSI bus active negation drivers
• SCAM Level 2
• Data transfer rate of up to 6.0 MB/ s asynchronous, 40 MB/ s Ultra SCSI,
80 MB/ s Ultra2 SCSI, 160 MB/ s Ultra160 SCSI, and 320 MB/ s
Ultra320 SCSI.
• SCSI bus fairness
• Ultra 320 Performance Enhancements
~ Adaptive Active Filter (AAF)
~ Transmitter Pre-Compensation with Cutback
~ Double Transition (DT) Data Transfers
~ Free Running Clock (FRC)
~ Skew Compensation
~ Cyclic Redundancy Check (CRC)
~ Domain Validation
~ Information Unit (IU) Transfers
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General Description
R eliability
• Automatic retry on read errors
• 360-bit, interleaved Reed-Solomon Error Correcting Code (ECC), with
cross checking correction up to three separate bursts of 32 bits each
totalling up to 96 bits in length
• Self-diagnostic firmware
• Patented Airlock® automatic shipping lock and dedicated landing zone
• Transparent media defect mapping
• High performance, in-line defective sector skipping
• R eassignment of defective sectors discovered in the field, without
reformatting
• Shock Sensing prevents the drive from writing data to the disk when the
drive is subjected to excessive external shock
• Thermal Sensing monitors the drive temperature to ensure on-going drive
reliability
• Shock Protection System II (SPS II) protects the drive against specific types
of handling events that could cause damage to the drive.
Versatility
• Downloadable firmware
• Plug-and-Play SCSI
• SCSI-2, Ultra160 SCSI, and Ultra320 SCSI compatibility
Maxtor Corporation’s disk drive products meet all domestic and international product
safety regulatory compliance requirements. Maxtor’s disk drive products conform to
the following specifically marked Product Safety Standards:
• Underwriters Laboratories (UL) Standard 1950. This certificate is a
category certification pertaining to all 3.5 of 5.25 inch series drives models.
• Canadian Standards Association (CSA) Standard C.22.2 No. 1950. This
certificate is a category certification pertaining to all 3.5 of 5.25 inch series
drives models.
• TUV R heinland Standard EN60 950. This certificate is a category
certification pertaining to all 3.5 of 5.25 inch series drives models.
Maxtor Atlas 10K III 2-3
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General Description
• CE Mark authorization is granted by TUV Rheinland in compliance with
our qualifying under EN 55022:1994 and EN 50082-1:1997.
• C-Tick Mark is an Australian authorization marked noted on Maxtor’s
disk drive products. The mark proves conformity to the regulatory
compliance document AS/ NZS 3548: 1995 and BS EN 55022: 1995.
• Maxtor’s disk drives are designed as a separate subassembly that conforms
to the FCC Rules for Radiated and Conducted emissions, Part 15 Subpart
J; Class B when installed in a given computer system.
The Maxtor Atlas 10K III hard disk drive is compatible with host computers and
controllers that provide a 68-pin Wide, or 80-pin SCA-2 interface. A 50-pin to 68-
pin adapter is required to use the 68-pin Wide drive in a 50-pin cabling configuration.
Termination is required on the Maxtor Atlas 10K III Hard disk drives as they do not
support on-board SCSI termination.
2-4 Maxtor Atlas 10K III
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This chapter explains how to unpack, configure, mount, and connect the
Maxtor Atlas 10K III hard disk drive prior to operation. It also explains how to start
up and operate the drive.
For your safety, follow all safety procedures described here and in other sections of
the manual.
• R emove power from the computer system (or expansion unit) before
installing or removing the drive to prevent the possibility of electrical
shock or damage to the drive. Unplug the unit containing the drive to
provide an added measure of safety.
• R ead, understand, and observe all label warnings.
Damage to the drive can occur as the result of careless handling, vibration, shock,
or electrostatic discharge (ESD). Always handle the drive with care to avoid damage
to the precision internal components.
A 1/ 4-inch drop onto a hard surface can damage the drive.
Follow these guidelines to avoid damage to the drive:
• Always observe prescribed ESD precautions.
• Keep the drive in its anti-static bag until ready to install.
• Always use a properly fitted wrist strap or other suitable ESD protection
when handling the drive.
• Hold drive only by its sides. Do not touch any components on the
PCBA.
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Installation
• Always handle the drive carefully and gently. A drop of 1/ 4 inch onto a
bench or desktop can damage a drive.
• Do not bump, jar, or drop the drive. Use care when transporting the
drive.
• Always gently place the drive flat, PCB side down, on an appropriate
ESD-protected work surface to avoid the drive being accidentally
knocked over.
• Do not pack other materials with the drive in its shielded bag.
• Place the drive in the anti-static bag before placing in shipping container.
• Do not stack objects on the drive.
• Never force the drive or the mounting brackets into the drive bay.
• Do not expose the drive to moisture.
• Do not damage any seals on the drive; doing so may void the warranty.
Various electrical components within the disk drive are sensitive to static electricity
and Electrostatic Discharge (ESD). Even a static buildup or discharge that is too
slight to feel can be sufficient to destroy or degrade a component's operation.
To minimize the possibility of ESD-related damage to the drive, we strongly
recommend using both, a properly installed workstation anti-static mat and a
properly installed ESD wrist strap. When correctly installed, these devices reduce
the buildup of static electricity which might harm the drive.
• Observe the following precautions to avoid ESD-related problems:
• Use a properly installed anti-static pad on your work surface.
• Always use a properly fitted and grounded wrist strap or other suitable
ESD protection when handling the drive and observe proper ESD
grounding techniques.
• Hold the drive only by its sides. Do not touch any components on the
PCBA.
• Leave the drive in its anti-static bag until you are ready to install it in the
system.
• Place the drive on a properly grounded anti-static work surface pad
when it is out of its protective anti-static bag.
• Do not use the bag as a substitute for the work surface anti-static pad.
The outside of the bag may not have the same anti-static properties as
the inside. It could actually increase the possibility of ESD problems.
• Do not use any test equipment to check components on the electronics
module. There are no user-serviceable components on the drive.
3-2
Maxtor Atlas 10K III
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Installation
The Maxtor Atlas 10K III hard disk drive is shipped without a faceplate and comes
in the following SCSI interface configurations:
• 68-pin Wide SCSI
• 80-pin SCA-2 SCSI
Shock Foot (typical)
25.59 mm
146.50 mm
101.60 mm
Shock Foot (typical)
25.59 mm
146.50 mm
101.60 mm
Dimensions for the Maxtor Atlas 10K III Hard Disk Drives
Maxtor Atlas 10K III 3-3
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Installation
Maxtor Atlas 10K III hard disk drives are outfitted with plastic shock feet on the
bottom edge of the base casting, near the corners, beneath the side mounting holes
(translucent), and near the corners of the top cover next to the screws (black). The
shock feet give an additional level of isolation to prevent the head and disk damage
that occasionally occurs during unpacking, staging, and installation. The shock feet
attenuate the short-pulse shocks that occur when placing the drive on a hard surface.
If the drive is tested on a hard surface, it should be supported such that the shock
feet are not in contact with a hard surface (the drive should be supported in the
middle, between the shock feet).
Note: To provide optimal protection the shock feet are designed to ex-
ceed the form factor when uncompressed.
The maximum limits for physical shock can be exceeded if
the drive is not handled properly. Special care should be
taken not to bump or drop the drive.
1. Open the shipping container and remove the packing assembly that contains
the drive.
2. R emove the drive from the packing assembly.
During shipment and handling, the antistatic electrostatic dis-
charge (ESD) bag prevents electronic component damage due
to electrostatic discharge. To avoid accidental damage to the
drive, do not use a sharp instrument to open the ESD bag.
Save the packing materials for possible future use.
3. When you are ready to install the drive, remove it from the ESD bag.
3-4
Maxtor Atlas 10K III
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Installation
This section includes setup and configuration information for Maxtor Atlas 10K III
drives. These disk drives include
• The 16-bit multimode Ultra160 SCSI, wide version with 68-pin SCSI
connector,
• The 16-bit multimode Ultra160 SCSI, version with SCA-2 80-pin
connector.
• The 16-bit multimode Ultra320 SCSI, wide version with 68-pin SCSI
connector,
• The 16-bit multimode Ultra320 SCSI, version with SCA-2 80-pin
connector.
Specific individual settings for each drive type are described in Sections 3.5.1
through 3.5.4.
Before you begin, review the Safety, ESD, and Handling precau-
tions described at the beginning of this manual to avoid personal in-
jury or damage to equipment.
This section describes how to configure the jumpers on Maxtor Atlas 10K III disks
with 68-pin SCSI interface connectors. The following features are jumper-
selectable:
• A0, A1, A2, A3 – SCSI Bus Device Identification
• FO – Fault Out (R emote LED)
• DS – Delay Spin
• SE – Force SE (Single-Ended, Disable LVD)
• BO – Busy Out (Remote LED)
• WP – Write Protect
• SS – Stagger Spin
• NW – No Wide (Enable Narrow Mode)
• TER MPWR – Termination Power
Note: The disk drive does not support on-board SCSI termination.
3-6
Maxtor Atlas 10K III
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Installation
The drives are shipped from the factory with the jumpers installed across the A1 and
A2 locations. This is the default configuration. The rest of the jumper positions are
open.
The configuration of a Maxtor Atlas 10K III hard disk drive depends on the host
(PCB) assemblies for 68-pin SCSI configurations, indicating the jumpers that
control some of these options.
J1 - 12-pin Option
Connector
(side view)
1
2
A0
A1
A2
A3
NC
+5V
FAULT
GND
GND
BUSY
GND
NC
11 12
Options
Header
4-pin Power
Connector
4
1
12-pin Option
Connector
Front of Drive
12
1
2
GND
GND
GND
SCSI ID (3)
68-pin SCSI
Connector
SCSI ID (2)
SCSI ID (1)
SCSI ID (0)
NO PIN PRESENT
DELAY SPIN
FORCE SE
NC
GND
FAULT OUT
GND
GND
NC
Back of Drive
+5 OUT
GND
GND
GND
GND
BUSY OUT
WRITE PROTECT
STAGGER SPIN
NO WIDE
RESERVED
TERMPWR
J3 - Option
Header
(side view)
TERMPWR
27 28
Jumper Locations on the 68-Pin Wide SCSI Drive PCB
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Installation
SCSI ID Selection on Option Connector (68-Pin SCSI Connector Drives)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Configure the drive for remote (external) SCSI ID selection by removing the SCSI
ID jumpers (if present) from the referenced SCSI ID pins. Then connect the leads
from the external selection switch to the referenced pins. Observe the following
guidelines while doing so:
• ID bit 0, at Pin 8, is the Least Significant Bit.
• SCSI ID bits 0, 1, 2, and 3 (pins 8, 6, 4, and 2, respectively) are active
LOW signals. That is, the bit is a 1 if the corresponding remote switch
is closed to ground.
• Use pins 1, 3, 5 and 7 as the associated ground returns for ID bits 3, 2,
1, and 0, respectively.
To configure Write Protection for the drive, install a jumper across pin pair 19/ 20
on the J3 Option Header. To disable Write Protection on the drive, remove the
jumper.
3-8
Maxtor Atlas 10K III
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Installation
Maxtor Atlas 10K III drives have three Spin Up modes:
Spin up immediately when power is applied. Verify that no jumper is installed
across the Delay Spin pin pair of the J3 Option Header.
Spin up after a predetermined delay following power on: Install the jumper across
pin pair 21/ 22 (GND/ Stagger Spin) on the J3 Option Header. Set the delay
parameters with the MODE SELECT command, Maxtor (Vendor) Special
Function Control Page (39h). The delay is equal to a user-specified
multiplier, multiplied by the numerical SCSI ID of the drive. This will give
a staggered spin-up in multiple-drive installations.
Spin up on START STOP UNIT command: Install the jumper across pin pair
11/ 12 (GND/ Delay Spin) on the J3 Option Header. Remove any jumper
from pin pair 21/ 22 (GND/ Stagger Spin) if a jumper is installed there, on the
Secondary Option connector.
Install a jumper across pin pair 13/ 14 (SE) on the J3 Option Header) to operate the
disk drive as a single-ended device. R emove the SE jumper for LVD operation and
monitoring of the DIFFSENS signal.
Busy and Fault status of the drive can be monitored remotely by connecting a
remote (external) Busy and/ or remote Fault display LEDs to the appropriate pins
on the J3 Option Header or the J1 Option Connector.
On the J3 Option Header, connect the cathode side of the remote Busy LED to pin
18, Busy Out. Connect the anode side of the LED to pin 17, +5V.
On the J1 Option Connector, connect the cathode side of the remote Busy LED
to pin 8, Busy Out. Connect the anode side of the LED to pin 11, +5V.
On the J3 Option Header, connect the cathode side of the remote Fault LED to
pin 9, Fault LED. Connect the anode side of the LED to pin 17, +5V.
On the J1 Option Connector, connect the cathode side of the remote Fault LED
to pin 2, Fault LED. Connect the anode side of the LED to pin 11, +5V.
Wide Data Transfer (WDTR) negations can be limited to 8-bit transfers by
installing a jumper across pin pairs 23/ 24 (No Wide) of the J3 Option Header. This
can also be done by setting byte 5, bit 4 in the Maxtor (Vendor) Unique Mode Page
(39h) via the Mode Select command (15h).
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Installation
The TER MPWR jumper enables the active termination circuit to receive power
circuitry.
Termination Power Circuitry
The drive has an on-board green ‘Busy’ LED and a yellow ‘Fault’ LED.
This section describes the SCA-2 (Single Connector Attachment) 80-pin connector
for Maxtor Atlas 10K III drives with the following features:
• SCSI ID
• Spin Up
• Activity LED displays
3-10 Maxtor Atlas 10K III
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Installation
Figure 3-5 does not call out each of the 80 pins on the connector, but rather
illustrates the layout of the pins.
Note: The SCA-2 Connector version of the disk drives does not provide
the following jumper configuration: TER MPWR, Active Termina-
tion, or Write Protection.
These versions of Maxtor Atlas 10K III disk drives cannot be
configured to provide bus termination. Therefore, be sure to
properly terminate the SCSI bus on which this drive is in-
stalled.
Note: R efer to your system or SCSI controller documentation regard-
ing any additional recommendations regarding drive placement
on the SCSI bus and SCSI bus termination.
Each SCSI device on the bus must have a unique SCSI ID number assigned to it.
The drive can be configured for SCSI ID numbers that range from 0 through 15.
Configure the SCSI ID by providing the proper open or ground signal inputs to the
Note: R efer to your system or SCSI controller documentation for spe-
cific recommendations about assigning SCSI ID numbers for
your specific system.
Pin 2
Pin 1
4.60±0.50
Pin 80
Pin Locations on SCA-2 Connector
Maxtor Atlas 10K III 3-11
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Installation
SCSI ID Pin Assignments (SCA-2 Connector Versions of the Disk Drive)
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Note: 0 indicates an open circuit from +2.4 V to Vcc +0.5 V, and 1
indicates ground from 0.5 V to +0.4 V.
Maxtor Atlas 10K III drives have three Spin Up modes:
Option 1 Spin up occurs immediately when power is applied.
Option 2 Drive spin up occurs after a predetermined delay following power on.
Set the delay parameters with the MODE SELECT Command,
Maxtor (Vendor) Special Function Control Page (39h).The delay is
equal to a user-specified multiplier multiplied by the numerical SCSI
ID of the drive. This will give a staggered spin-up in multiple-drive
installations.
Option 3 Drive spin up is controlled by the STAR T STOP UNIT command.
3-12 Maxtor Atlas 10K III
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Installation
DELAY_SPIN (Pin 38) and STAGGER _SPIN (Pin 78) inputs on the 80-pin SCA-
wired connections at the backplane or backplane logic.
Spin Up on Power On Options
– Spin Up When Power is Applied
– Spin Up After Delay
Open
Ground
Open
Open
Open
– Spin Up on START Com m and
Ground
Ground
Reserved
Ground
The drive provides the output BUSY_OUT signal to power a user-supplied activity
LED.
The output indicates the drive is performing a SCSI operation. To use this output,
connect a user-supplied LED cathode to the BUSY_OUT connection, pin 77 on
+5 VDC supply through an appropriate current-limiting resistor.
Maxtor Atlas 10K III 3-13
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Installation
When the J7 SE jumper is installed, it forces single-ended SCSI operation, and
disables LVD mode and auto switch capabilities. When the jumper is not installed
it allows auto switch to single-ended SCSI or LVD SCSI operation.
Back of Drive
Front of Drive
SCA J1
Connector
J7
Jumper J7
NC
SE
J7 Jumper Location on the 80-Pin SCA PCB
Note: Force Single Ended Jumper needs to be across 2 lower pins in the
magnified 4-pin diagram.
3-14 Maxtor Atlas 10K III
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Installation
The configuration of J1 is different for the 68-pin and 80-pin SCSI variations.
J1 SCSI (68-Pin)/DC (4-Pin)/Auxiliary (12-pin) Combination Connector
12-Pin Option
Connector
4-Pin DC
Power Connector
Pin 2
Pin 1
Pin 1
68-Pin SCSI-Bus Interface Connector
4
3
2
1
A
M
P
Pin 68
Pin 12
Pin 2
J1 SCSI (80-Pin) SCA Connector
Pin 2
Pin 1
Bottom
2.25±0.1
4.6±0.50
Pin 80
Top
J1 Interface Connector Configurations
Maxtor Atlas 10K III 3-15
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Installation
68-Pin Wide LVD Pin Assignments
+DB (12)
1
2
3
4
5
6
7
8
1
3
5
7
2
4
6
8
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
–DB (12)
–DB (13)
–DB (14)
–DB (15)
–DB (P1)
–DB (0)
–DB (1)
–DB (2)
–DB (3)
–DB (4)
–DB (5)
–DB (6)
–DB (7)
–DB (P)
GROUND
GROUND
TERMPWR
TERMPWR
RESERVED
GROUND
–ATN
GROUND
–BSY
–ACK
–RST
–MSG
–SEL
–C/D
–REQ
–I/O
+DB (13)
+DB (14)
+DB (15)
+DB (P1)
+DB (0)
+DB (1)
+DB (2)
+DB (3)
+DB (4)
+DB (5)
+DB (6)
+DB (7)
+DB (P)
GROUND
DIFFSENS
TERMPWR
TERMPWR
RESERVED
GROUND
+ATN
GROUND
+BSY
+ACK
+RST
+MSG
+SEL
+C/D
+REQ
+I/O
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
+DB (8)
+DB (9)
+DB (10)
+DB (11)
–DB (8)
–DB (9)
–DB (10)
–DB (11)
Note: The conductor number refers to the conductor position when
using 0.635 mm (0.025 inch) centerline flat ribbon cable. Other
cable types may be used to implement equivalent contact assign-
ments.
The cable plug connector that mates with the 68-pin hard disk drive connector is
the AMP AMPLIMITE .050 Series III, part number 749925-5.
3-16 Maxtor Atlas 10K III
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Installation
80-Pin SCA-2 LVD Pin Assignments
(L) 12V CHARGE
(S) 12V
1
NOT APPLICA-
BLE
(L) 12V GROUND
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
4
(L) 12V GROUND
(L) 12V GROUND
(S) MATED 1
(L) L OPT 3.3V CHARGE
(L) DIFFSNS
(S) +DB (11)
(S) +DB (10)
(S) +DB (9)
(S) +DB (8)
(S) +I/O
(S) 12V
3
(S) 12 V
4
(S) OPT 3.3 VOLTS
(S) OPT 3.3 VOLTS
(S) –DB (11)
(S) –DB (10)
(S) –DB (9)
(S) –DB (8)
(S) –I/O
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
(S) –REQ
(S) +REQ
(S) –C/D
(S) +C/D
(S) –SEL
(S) +SEL
(S) –MSG
(S) +MSG
(S) –RST
(S) +RST
(S) –ACK
(S) +ACK
(S) –BSY
(S) +BSY
(S) –ATN
(S) +ATN
(S) –DB (P0)
(S) –DB (7)
(S) –DB (6)
(S) –DB (5)
(S) –DB (4)
(S) –DB (3)
(S) +DB (P0)
(S) +DB (7)
(S) +DB (6)
(S) +DB (5)
(S) +DB (4)
(S) +DB (3)
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Installation
(S) –DB (2)
(S) –DB (1)
(S) –DB (0)
(S) –DB (P1)
(S) –DB (15)
(S) –DB (14)
(S) –DB (13)
(S) –DB (12)
(S) 5V
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
(S) +DB (2)
(S) +DB (1)
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
(S) +DB (0)
(S) +DB (P1)
(S) +DB (15)
(S) +DB (14)
(S) +DB (13)
(S) +DB (12)
(S) MATED 2
(L) 5V GROUND
(L) 5V GROUND
(L) ACTIVE LED OUT
(L) DLYD_START
(L) SCSI ID (1)
(L) SCSI ID (3)
(S) 5V
(L) 5V CHARGE
(L) SPINDLE SYNC
(L) RMT START
(L) SCSI ID (0)
(L) SCSI ID (2)
(S) = Short pin
(L) = Long pin
The compatible 80-pin mating connectors are:
• R ight-angle receptacle, AMP CHAMP, .050 Series I, part number 787535-1.
• Vertical receptacle, AMP CHAMP .050 Series I, part number 787311-2.
• Vertical receptacle, BER G part number 71780-001.
3-18 Maxtor Atlas 10K III
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Installation
68-Pin Wide Single-Ended Pin Assignments
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
TERMPWR
TERMPWR
RESERVED
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
1
2
3
4
5
6
7
8
1
3
5
7
2
4
6
8
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
–DB (12)
–DB (13)
–DB (14)
–DB (15)
–DB (P1)
–DB (0)
–DB (1)
–DB (2)
–DB (3)
–DB (4)
–DB (5)
–DB (6)
–DB (7)
–DB (P)
GROUND
GROUND
TERMPWR
TERMPWR
RESERVED
GROUND
–ATN
GROUND
–BSY
–ACK
–RST
–MSG
–SEL
–C/D
–REQ
–I/O
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
–DB (8)
–DB (9)
–DB (10)
–DB (11)
Note:
2. The conductor number refers to the conductor position when using 0.635
mm (0.025 inch) centerline flat ribbon cable. Other cable types may be used
to implement equivalent contact assignments.
Maxtor Atlas 10K III 3-19
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Installation
80-Pin SCA-2 Single-Ended Pin Assignments
(L) 12V CHARGE
1
NOT APPLICA-
BLE
(L) 12V GROUND
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
1
(S) 12V
(S) 12V
(S) 12 V
4
3
4
(L) 12V GROUND
(L) 12V GROUND
(S) MATED 1
(S) OPT 3.3 VOLTS
(S) OPT 3.3 VOLTS
(S) –DB (11)
(S) –DB (10)
(S) –DB (9)
(S) –DB (8)
(S) –I/O
5
6
(L) L OPT 3.3V CHARGE
(L) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S)GROUND
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
(S) –REQ
(S) –C/D
(S) –SEL
(S) –MSG
(S) –RST
(S) –ACK
(S) –BSY
(S) –ATN
(S) –DB (P0)
(S) –DB (7)
(S) –DB (6)
(S) –DB (5)
(S) –DB (4)
(S) –DB (3)
(S) –DB (2)
(S) –DB (1)
(S) –DB (0)
(S) –DB (P1)
(S) –DB (15)
(S) –DB (14)
(S) –DB (13)
(S) –DB (12)
(S) 5V
(S) GROUND
(S) GROUND
(S)GROUND
(S) GROUND
(S) GROUND
(S) GROUND
(S) MATED 2
74
75
76
77
78
79
80
(S) 5V
(L) 5V GROUND
(L) 5V GROUND
(L) ACTIVE LED OUT
(L) DLYD_START
(L) SCSI ID (1)
(L) SCSI ID (3)
(L) 5V CHARGE
(L) SPINDLE SYNC
(L) RMT START
(L) SCSI ID (0)
(L) SCSI ID (2)
(S) = Short pin, (L) = Long pin
3-20 Maxtor Atlas 10K III
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Installation
The recommended mating connectors for the +5 VDC and +12 VDC input power
Power Connector (J1, Section A)
1
2
+12 VDC
4-Pin Connector:
AMP P/N 1-480424-0
Loose piece contacts:
AMP P/N VS 60619-4
Strip contacts:
Ground
Return for
+12 VDC
3
4
Ground
Return for
+5 VDC
AMP P/N VS 61117-4
+5 VDC
Note: J1, Section A, pins 2 and 3 are the +5 and +12 volt returns and
are connected together on the drive.
The recommended mating connectors for the +5 VDC and +12 VDC input power
Maxtor Atlas 10K III 3-21
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Installation
J1 on the 68-pin SCSI PCB contains a 12-pin auxiliary connector. The pin
J1 Auxiliary 12-Pin Connector
1
SCSI Addr -
A0
12-pin connector:
Hirose Electric Co.
Dual-row crim p socket: A3B-12D-
2C
Crim p term inals: A3B-26305CC
(or equivalent)
2
3
XTFAULT
SCSI Addr -
A1
4
5
GND
SCSI Addr -
A2
6
7
GND
SCSI Addr -
A3
8
9
Busy Out
NC
10
11
GND
LED Pwr (+5
V)
12
NC
3-22 Maxtor Atlas 10K III
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Installation
Drive mounting orientation, clearance, and ventilation requirements are described
in the following subsections.
The mounting holes on the Maxtor Atlas 10K III hard disk drive allow the drive to
mounting holes on each side of the drive. The drives also can be mounted using the
four mounting hole locations on the PCB side.
All dimensions are in millimeters. For mounting, # 6-32 UNC screws are
recommended.
25.59
41.60
±0.25
59.99
±0.25
28.16
6.35
40.97
±0.50
44.45
±0.25
95.24
±0.25
101.60
±0.25
146.50
Mounting Dimensions Maxtor Atlas 10K III Drives
Maxtor Atlas 10K III 3-23
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Installation
The printed-circuit board assembly (PCBA) is very close to the mounting holes.
Figure 3-9 specifies the clearance between the screws in the mounting holes and the
PCBA. Do not use mounting screws longer than the maximum lengths specified in
while avoiding damaging or placing unwanted stress on the PCBA. Clearance from
the drive to any other surface (except mounting surfaces) must be a minimum of
1.25 mm (0.05 inches).
Shock Clip
4.78 mm Maximum
Bottom Depth
6.35 mm Maximum
Side Depth (0.25 Inches)
(0.188 Inches)
B
Drive
Mounting
Screw
A
Printed-
Circuit
Board
Printed-
Circuit
Board
Head/Disk
Assembly
Mounting Screw Clearance for Maxtor Atlas 10K III Drive
The PCB is very close to the mounting holes. Do not exceed the speci-
fied length for the mounting screws. The specified screw length allows full
use of the mounting-hole threads, while avoiding damaging or placing
unwanted stress on the PCB.
screws in the mounting holes. The maximum torque applied to the
screws must not exceed 8.7 inch-pounds (1.00 N-m).
3-24 Maxtor Atlas 10K III
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Installation
The shock clip provides an extra level of isolation from the occurrence of a short
duration non-operational shock, particularly when the drive is mounted on a rigid
platform. Shock performance is optimal when either four bottom mount locations
or four outer side screw locations are used.
Note: To prevent the possibility of a cross-threaded screw, it is suggested that
the screws associated with the fixed bottom mounting locations be
started before the screw associated with the shock clip. It is always good
practice to install all the screws completely prior to the final torque pro-
cess.
For the best results during performance benchmark testing, it is highly
recommended that the drive be mounted firmly in a system or fixture, rather than
sitting unconstrained on a tabletop. If it is necessary to do early testing of the drive
while it is unconstrained, the drive should rest on a flat, smooth, semi-cushioned
surface (similar to a mousepad). The drive should not be operated on a hard
surface—this avoids performance degradations due to the higher incidence of
recovered errors.
The Maxtor Atlas 10K III hard disk drive operates without a cooling fan, provided
other surface above and below the drive must be a minimum of 1.25 mm (1/ 16
inch) with a minimum airflow of 150 LFM.
Above Unit
Below Unit
Lengthwise Airflow Cooling
Maxtor Atlas 10K III 3-25
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This chapter gives a detailed description of the physical, electrical, and environmental
characteristics of the Maxtor Atlas 10K III hard disk drives.
Specifications
Form atted Capacity
18.4 GB
10,000
36.74 GB
10,000
73.49 GB
10,000
Nom inal rotational speed
(rpm )
Num ber of Disks
Num ber of R/W heads
Data Organization:
Zones per surface
Track density
1
2
2
4
4
8
24
24
24
40,000 tpi
31,022
40,000 tpi
31,022
40,000 tpi
31,022
User Data Cylinders
Total tracks
61,782
123,564
247,128
Sectors per track:
Inside zone
412
660
412
660
412
660
Outside zone
Total User Sectors
Bytes per sector
Recording
35,916,547
512
71,833,095
512
143,666,191
512
Recording technology
PRML 50/52
encoding
PRML 50/52
encoding
PRML 50/52
encoding
Maxim um linear density
Encoding m ethod
452K fci
452K fci
452K fci
24/25 RLL-NPR
24/25 RLL-NPR
24/25 RLL-NPR
Maxtor Atlas 10K III 4-1
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Specifications
Maxim um effective areal
density
17.2 Gbits/in
17.2 Gbits/in
17.2 Gbits/in
Servo Mechanical Tim ing Specifications:
Sequential Head Switch
Tim e
≤.27 m s read
≤.73 m s write
≤.27 m s read
≤.73 m s write
≤.27 m s read
≤.73 m s write
Sequential Cylinder Switch
Tim e
≤.3 m s read
≤.8 m s write
≤.3 m s read
≤.8 m s write
≤.3 m s read
≤.8 m s write
Random Average Seek
(Read)
4.5 m s typical
5.0 m s typical
4.5 m s typical
5.0 m s typical
4.5 m s typical
5.0 m s typical
Random Average Seek
(Write)
Full Stroke Seek (Read)
≤11.0 m s typical ≤11.0 m s typical
22 m s typical 22 m s typical
≤11.0 m s typical
SCSI ‘Hard’ Reset Tim e
22 m s typical
25 sec m axim um 25 sec m axim um 25 sec m axim um
Power on to Drive Ready
Data transfer Rates:
20 m s typical
20 m s typical
20 m s typical
Sequential Throughput
Read/Write
55 MB/s
m axim um
55 MB/s
m axim um
55 MB/s
m axim um
Buffer Size
8 MB
8 MB
8 MB
Reliability:
Seek error rate
Unrecoverable error rate
<10 in 10
<10 in 10
<10 in 10
<10 in 10
<10 in 10
<10 in 10
Error correction m ethod
(with cross check)
45 Bytes Reed-
Solom on with
XCHK
45 Bytes Reed-
Solom on with
XCHK
45 Bytes Reed-
Solom on with
XCHK
Contact Start/Stop Cycles
Auto head-park m ethod
50,000 m in.
50,000 m in.
50,000 m in.
AirLock® - with
AirLock® - with
AirLock® - with
m agnetic bias
m agnetic bias
m agnetic bias
9
Grown Block Lim it
(1 48 hours)
20
20
25
st
Note: Seek time is defined as the time required for the actuator to seek
to a new position and settle on a track. It is measured by averag-
ing the execution time of a minimum of 1000 operations of the
head settling time, but do not include command overhead time,
time spent reading or writing data, or rotational latency delays.
Unless otherwise specified, read/ seek command settling criteria
is assumed.
4-2 Maxtor Atlas 10K III
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Specifications
1. Typical specifications assume 25°C ambient temperature, nominal supply
voltages and no applied shock or vibration.
Maximum specifications assume worst case extremes of operating temperature,
humidity, and supply voltages.
2. Sequential Head Switch time is the time from the conclusion of the last
sector of a track to the beginning of the first logical sector on the next track
of the same cylinder. It includes sequencer overhead for write setup on head
and cylinder switch.
3. Sequential Cylinder Switch time is the time from the conclusion of the last
sector of a cylinder to the first logical sector on the next cylinder. It includes
sequencer overhead for write setup on head and cylinder switch.
4. R andom LBA.
5. Full Stroke seek is defined as a seek from cylinder 0 to maximum cylinder
or vice versa. It may include one head switch.
6. SCSI ‘Hard’ R eset time is the time from Reset to Selection.
7. At power on start-up error algorithms are used. These recovery routines
may extend the time to Drive R eady by as much as 30 seconds.
8. R efer to Section 4.11, “DISK ER R OR S” for details on error rate
definitions.
9. Post 48 hours Grown spec. = All capacities <10 per 1000 hours of
operation.
At the factory, the Maxtor Atlas 10K III receives a low-level format that creates
from this process. Formatting done at the user level for operation with DOS,
UNIX, or other operating systems, will result in less capacity than the physical
capacity shown.
Formatted Capacity
Form atted Capacity
18.4 GB
36.7 GB
73.4 GB
Num ber of 512-byte
sectors available
35,944,444
71,888,888
143,777,776
Maxtor Atlas 10K III 4-3
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Specifications
Data is transferred from the disk to the read buffer at a rate of up to 55 MB/ s in
bursts. Data is transferred from the read buffer to the SCSI bus at a rate of up to
6 MB/ s in the asynchronous mode, or at up to 160 or 320 MB/ s in the
synchronous mode. For more detailed information on interface timing, refer to
Chapter 6.
disk drive.
Timing Specifications for Maxtor Atlas 10K III
Sequential Head Switch Tim e
≤ .27 m s typical (read)
N/A
N/A
≤
Sequential Cylinder Switch Tim e
≤ .3 m s typical (read)
≤
Random Average Seek (Read)
Random Average Seek (Write)
Average Rotational Latency
1/3 Stroke Seek (Read)
Full-Stroke Seek
<4.5 m s
5.0 m s
5.1 m s
5.5 m s
3 m s
3 m s
<4 m s
4.5 m s
≤11.0 m s
20 m s
13.0 m s
20 m s
SCSI “Hard Reset Tim e”
Power On to Drive Ready
Power On to Selection
22 seconds
2.5 seconds
25 seconds
3 seconds
1. Typical specifications assume 25°C ambient temperature, nominal supply
voltages, and no applied shock or vibration. Maximum specifications
assume worst case extremes of operating temperature, humidity, and
supply voltages.
2. Sequential Head Switch Time is the time from the conclusion of the last
sector of a track to the beginning of the first logical sector on the next
track of the same cylinder.
3. Sequential Cylinder Switch Time is the time from the conclusion of the
last sector of a cylinder to the first logical sector on the next cylinder.
4. Random LBA.
5. 1/ 3 Stroke Seek is defined as any seek of maximum length cylinder/ 3. 1/
3 stroke seek may include one head switch.
6. Full Stroke Seek is defined as a seek from cylinder 0 to maximum cylinder
or vice versa. Full stroke may include one head switch.
7. SCSI “Hard R eset Time” is the time from R eset to Selection.
8. At power on, startup error algorithms are used and may extend the
time to Drive Ready to as long as 30 seconds.
4-4 Maxtor Atlas 10K III
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Specifications
The Maxtor Atlas 10K III hard disk drive operates from two supply voltages:
+12 V
+5 V
±10%
±5%
Allowable ripple and noise for each voltage:
250 m Vp-p
+12 V
+5 V
800 m V p-p (100 Hz to 8 KHz)
250 m V p-p (8 KHz to 20MHz)
You may apply the power in any order or manner, or open either the power or
power return line with no loss of data or damage to the disk drive. However,
data may be lost in the sector being written at the time of power loss. The drive
can withstand transient voltages of +10% to –100% from nominal while
powering up or down.
When powering up, the drive remains reset (inactive) until both rising Voltage
thresholds reset limits are exceeded for 100 ms. When powering down, the drive
resets immediately when either supply voltage drops below the falling voltage
threshold.
Power Reset Limits1
+5 V
V
=
4.175V typical
4.0V m inim um
4.35V m axim um
+12 V
V
=
9.5V typical
9.0V m inim um
10.0V m axim um
Maxtor Atlas 10K III 4-5
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Specifications
various modes of operation of the Maxtor Atlas 10K III hard disk drive.
Power Dissipation in Various Modes (Low-Profile Drives)
Startup
peak
2.2
2.2
2.2
0.9
0.9
0.9
30.9
10.2
30.9
10.2
30.9
10.2
1
2
Idle
0.63
0.63
0.63
0.46
0.46
0.46
Random Seek
+ Read/
0.97
0.97
0.97
0.79
0.79
0.79
15.6
15.6
15.6
3
Write
100%
Random Seek
(No R/W)
1.14
0.48
1.14
0.48
1.14
0.48
0.52
.305
0.52
.305
0.52
.305
16.3
7.26
16.3
7.26
16.3
7.26
6
Standby
1. Current is R MS except for Startup. Startup current is the peak (> 10 ms)
current required during spindle startup. Current measurements do not
include power required for SCSI termination.
2. Idle mode is in effect when the drive is not reading, writing, seeking, or
executing any commands. A portion of the R / W circuitry is powered
down, the motor is up to speed and the Drive R eady condition exists.The
actuator resides on the last track accessed.
3. R andom Seek + R ead/ Write measured at 100% random 2KB R / W, Q=4.
4. Maximum Average Current is defined as mean current plus 3 Standard
Deviations.
5. Power requirements reflect nominal values for +12V and +5V power
supplies.
6. Standby mode is in effect when the motor is stopped, the actuator parked,
and all electronics except the interface control is in low power state. Standby
will occur after a programmable time-out since last host access occurs. Drive
R eady and Seek Complete status exist. The Standby mode will not be in
effect upon receipt of a command which requires disk access or upon receipt
of a spin-up command.
4-6 Maxtor Atlas 10K III
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Specifications
disk drive. The acoustics is measured in an anechoic chamber with background
noise <25 dBA.
Acoustical Characteristics—Sound Power per ISO 7779
Idle On Track
18.4 GB
36.7 GB
73.4 GB
3.1 Bels (typical)
3.4 Bels (typical)
3.6 Bels (typical)
3.3 Bels
3.6 Bels
3.8 Bels
Seeking Random
18.4 GB
4.1 Bels (typical)
4.3 Bels (typical)
4.4 Bels (typical)
4.3 Bels
4.5 Bels
4.6 Bels
36.7 GB
73.4 GB
1. The specifications for idle and operating acoustic noise as per ISO Standard
7779, “Engineering Methods for Free Field Conditions Over a R eflecting
PLane.” All specifications are sound power level maximum limits, A-
weighted, referred to 1 picowatt as indicated in the standard. The drive will
be mounted for the test in the manufacturer’s defined nominal position.
The unit under test should be supported so that its bottom surface in the test
orientation is less than or equal to 6 centimeters from the chamber floor, but
not in contact with it. The unit should be supported with small, compliant,
well-damped blocks that rest on the floor.
2. The relationship between bels and dBA for sound power is 1 bel = 10dBA.
A typical drive will have no discrete tones that exceed a tone ratio of 6 dB as
measured per ISO 7779, Annex D.
Maxtor Atlas 10K III 4-7
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Specifications
The Maxtor Atlas 10K III hard disk drives have the following mechanical
characteristics:
Height1:
Width:
Depth:
1.0 in.
4.0 in.
5.75 in.
(25.4 mm)
(101.6 mm)
(146.1 mm)
Weight (4-disk): 1.58 lb (720 grams)
All dimensions are exclusive of any optional faceplate.
III hard disk drive.
Environmental Specifications
Tem perature
(Non-condensing)
5° to 55°C
(41° to 131°F)
-40° to 70°C
(-40° to 158°F)
Tem perature Gradient
(Non-condensing)
20°C/hr m axim um
30°C/hr m axim um
Hum idity
5% to 95% RH
5% to 95% RH
Maxim um Wet Bulb
Tem perature
37°C (98°F)
46°C (126°F)
Hum idity Gradient
Altitude
30% per hour
30%per hour
-300 m to 3,048 m
(-1,000 to 10,000 ft.)
-300 m to 12,000 m
(-1,000 to 40,000 ft.)
1. No condensation.
2. Altitude is relative to sea level. 1,000 feet = 3,000 meters.
1.
4-8 Maxtor Atlas 10K III
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Specifications
5 Volts/ meter @ 100 MHz.
The drive functions normally when any exposed metal is subjected to
electrostatic discharge excluding the PCB. This electrostatic discharge must be at
a minimum interval of 30 seconds, either from a 150pF capacitor discharged
through a 150KΩ resistor or from a 100pF capacitor through a 500kΩ resistor.
0 – 5kV
5 – 10 kV
10 – 20 kV
Average of <0.3 soft errors per discharge
Average of <1.0 soft errors per discharge
No perm anent degradation
The Maxtor Atlas 10K III family of drives meets all specifications with a 6 gauss
field applied in any environment at 100 kHz.
Maxtor Atlas 10K III 4-9
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Specifications
The Maxtor Atlas 10K III hard disk drive can withstand levels of shock and
vibration applied to any of its three mutually perpendicular axes, or principal base
operating levels of shock and vibration. When a drive has been subjected to
specified non-operating levels of shock and vibration, with power to the drive
off, there will be no change in performance at power on.
When packed in its 1-pack shipping container, the Maxtor Atlas 10K III drive
can withstand a drop from 30 inches onto a concrete surface on any of its surfaces,
six edges, or three corners. The 12-pack shipping container can withstand a drop
from 30 inches onto a concrete surface on any of its surfaces, six edges, or three
corners.
Shock and Vibration Specifications
Shock linear
(G/Num ber of shocks)
63 G/20
250 G (18.4 GB, 36.7 GB,
and 73.4 GB)
1/2 sine wave, 2 m s
duration
1/2 sine wave, 2 m s duration
20,000
Shock rotational
(rad/s )
N/A
Vibration Swept
3 G p-p 5—300 Hz
2 G p-p 5–500 Hz
0.5 G p-p 5—500 Hz
Vibration Random
(G /Hz) 1 G rm s
0.008 10—300 Hz
0.05 10—300 Hz
0.0012 300—500 Hz
0.01 300—500 Hz
Note: 1. At ambient temperature and no unrecoverable errors.
Component Life:
5 years
Preventive Maintenance (PM): Not required
Contact Start/ Stop:
50,000 cycles at all environments
(Equal number of power off
and standby spin downs)
Annualized Failure R ate (AFR ) No greater than 0.9 percent
Drive reliability is closely related to the temperatures the drive is exposed to. The
operational design temperature ambient is 86°F (30°C). Temperature ambient
above 131°F (55°C) or below 41°F (5°C) may decrease drive reliability.
4-10 Maxtor Atlas 10K III
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Specifications
Error Rates
Recovered read errors
<10 events per 10 bits read
1 event per 10 bits read
<10 events per 10 seeks
Uncorrectable read errors
Seek Errors
1. R ecovered read errors are errors which require retries for data correction.
Errors corrected by ECC on-the-fly are not considered recovered read
errors. R ead on arrival is disabled to meet this specification.
2. Uncorrectable read errors are those that are not correctable using an Error
Correcting Code (ECC), or retries within the retry limits specified in the
mode pages. The drive terminates the command either when a repeating
error pattern occurs, or after both the specified number of retries and
application of triple burst error correction fail to correct the error.
3. A seek error occurs when the actuator fails to reach or remain on the
requested cylinder, and/ or the drive requires the execution of the full
calibration routine to locate the requested cylinder.
Maxtor Atlas 10K III 4-11
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Specifications
4-12 Maxtor Atlas 10K III
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This chapter contains an overview of SCSI command and status processing and a
detailed description of the commands supported by the disk drives. The SCSI
command system enables the initiator to instruct the drive to perform specific
functions.
In this manual, unless otherwise stated, numerical values are given in decimal.
Hexadecimal numbers, such as opcodes, are always given with an “h” following, as in
5Ah except when entire data tables are in hexadecimal.
categories are sequential, normal, and immediate.
Im m ediate commands are processed when received by the drive. In most cases, these
commands do not require drive resources, do not change the state of the drive, and
bypass the command queue (unless the command is tagged).
Sequential commands execute in the order that they arrive (unless accompanied by
a HEAD OF QUEUE tag) and execute to completion before a subsequent command
is activated.
Norm al commands are allowed to execute concurrently (with the restriction that the
drive executes overlapping writes in the order received). Normal commands are
usually I/ O commands
Supported SCSI Commands
CHANGE DEFINITION
FORMAT UNIT
40h
04h
12h
4Ch
4Dh
15h
55h
1Ah
5Ah
5Eh
Sequential
Sequential
Im m ediate
Sequential
Sequential
Sequential
Sequential
Sequential
Sequential
Sequential
INQUIRY
LOG SELECT
LOG SENSE
MODE SELECT (6)
MODE SELECT (10)
MODE SENSE (6)
MODE SENSE (10)
PERSISTENT RESERVATION IN
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SCSI Description
PERSISTENT RESERVATION OUT
5Fh
08h
28h
3Ch
25h
37h
B7h
3Eh
E8h
07h
1Ch
17h
57h
A0h
A3h
03h
16h
56h
01h
0Bh
2Bh
1Dh
A4h
1Bh
35h
00h
2Fh
0Ah
2Ah
2Eh
3Bh
3Fh
41h
EAh
Sequential
Norm al
READ (6)
READ (10)
Norm al
READ BUFFER
Sequential
Im m ediate
Sequential
Sequential
Sequential
Norm al
READ CAPACITY
READ DEFECT DATA (10)
READ DEFECT DATA (12)
READ LONG
READ SKIP MASK
REASSIGN BLOCKS
RECEIVE DIAGNOSTIC RESULTS
RELEASE
Sequential
Sequential
Sequential
Sequential
Sequential
Sequential
Im m ediate
Sequential
Sequential
Sequential
Sequential
Sequential
Sequential
Sequential
Sequential
Sequential
Im m ediate
Norm al
RELEASE (10)
REPORT LUNS
REPORT DEVICE IDENTIFIER
REQUEST SENSE
RESERVE
RESERVE (10)
REZERO UNIT
SEEK (6)
SEEK (10)
SEND DIAGNOSTIC
SET DEVICE IDENTIFIER
START STOP UNIT
SYNCHRONIZE CACHE
TEST UNIT READY
VERIFY
WRITE (6)
Norm al
WRITE (10)
Norm al
WRITE AND VERIFY
WRITE BUFFER
WRITE LONG
Norm al
Sequential
Sequential
Sequential
Norm al
WRITE SAME
WRITE SKIP MASK
1. R elative Addressing is not supported by the drive. Therefore, in all I/ O commands,
the R elAdr bit must be 0.
2. R ESER VE and RELEASE are supported, as are third-party reservations. Extent
reservations are not supported.
3. The R ECEIVE DIAGNOSTIC RESULTS and SEND DIAGNOSTIC DATA
commands implement vendor-unique pages to test the drive during the manufacturing
process. It is recommended that initiators specify only the non-page format variants of
these commands (PF=0), except for page 0x40.
5-2
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SCSI Description
An initiator communicates with the drive by sending a 6-, 10-, or 12-byte Command
Descriptor Block (CDB) that contains the parameters for the specific command. The
SCSI command's operation code is always the first byte in the CDB and a control field
is the last byte. For some commands, the CDB is accompanied by a list of parameters
byte CDB.
Typical (6-Byte) Command Descriptor Block-Data Format
0
1
Operation Code
(MSB)
Reserved
Logical Block Address
(LBA)
Logical Block Address
(LBA)
2 - 3
4
5
Transfer Length, Param eter List Length, or Allocation Length
Control
R eserved fields in CDBs and Parameters have a value of 0; R e-
served fields in states and other parameters sent to an initiator are
set to 0.
Command Descriptor Block-Field Descriptions
Operation Code
The first byte of a SCSI CDB contains an operation code. The oper-
ation code of the CDB has a field (bits 7-5) and a
field (bits 4-0). The 3-bit Group Code field provides for
eight groups of com m and codes. The 5-bit Com m and Code field
provides for 32 com m and codes in each group. A total, therefore,
of 256 possible operation codes exist. Operation codes are defined
in the SCSIcom m and standards. The group code for CDBs specified
therein correspond to the length of the com m and descriptor as be-
low:
Group Code
Meaning
0
1
2
3
4
5
6
7
6-byte com m ands
10-byte com m ands
10-byte com m ands
Reserved
16-byte com m ands
12-byte com m ands
Vendor specific
Vendor specific
The operation code specifies the com m and being requested. The list
of supported SCSI com m ands and their operation codes are con-
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SCSI Description
Logical Block Address
The 6-byte READ, SEEK, and WRITE Com m and Descriptor Blocks
contain a 21-bit Logical Block Address. The 10-, 12-, and 16- Com -
m and Descriptor Blocks contain a 32-bit Logical Block Address.
Com m ands that require additionalparam eter data specify the length
of the Logical Block Address that is needed. See the specific com -
m and descriptions for m ore detailed inform ation.
Relative Addressing indicates a technique used to determ ine the
next Logical Block Address to be operated on. The drive does not
support Relative Addressing, it defaults to a value of 0, which spec-
ifies that the Logical Block Address specifies the first logical block
of a range of logical blocks to be operated on by the com m and.
Transfer Length
The transfer length field norm ally specifies the num ber of sectors to
be transferred between the initiator and the drive. For several com -
m ands, the transfer length indicates the num ber of bytes (not sec-
tors) to be sent. For these com m ands, this field m ay be identified
by a different nam e
Com m ands that use
for the transfer length value allow up
to 256 sectors of data to be transferred by one com m and. A trans-
fer length value of 0 indicates that 256 sectors are to be sent.
Transfer length values of 1 through 255 indicate the num ber of sec-
tors to be transferred.
Com m ands that use
for the transfer length value
function differently. A transfer length value of 0 indicates that no
data transfer is to occur. Transfer length values of 1 or greater in-
dicate the num ber of sectors to be transferred.
Param eter List Length
Allocation Length
The Param eter List Length is used to specify the num ber of bytes
sent during the data-out buffer transfer. This field is typically used
for param eters that are sent to a drive (for exam ple, m ode, diagnos-
tic, and log param eters). A param eter list length of 0 indicates that
no data is to be transferred.
The Allocation Length field specifies the m axim um num ber of bytes
that the initiator has allocated for returned data. The Allocation
Length is used to lim it the am ount of data returned to the initiator.
An Allocation Length of 0 indicates that no data is to be transferred
from the drive to the initiator. The drive term inates the data-in buff-
er transfer when the specified num ber of bytes have been trans-
ferred to the initiator or when all available data has been transferred,
whichever is less.
Control Field
The Control Field is the last byte of every Com m and Descriptor
Block; its form at is shown in Figure 5-2 and described in Table 5-3.
Typical (6-Byte) Command Descriptor Block — Data Format
5
Ven-
dor
Specif-
ic
Re-
served
NACA
Flag
Link
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SCSI Description
Command Descriptor Block Control Field-Field Descriptions
Vendor Specific Bits
These bits m ust be 0.
NACA
Norm al Auto-Contingent Allegiance - This bit
cate that SCSI-2 Contingent Allegiance rules apply.
to indi-
Link Bit
A Link bit set to one signals that the initiator requests continuation
of a task
(I/O Process) across two or m ore SCSI com m ands. If the Link bit is
one and the flag bit is zero, and the com m and com pletes success-
fully, the drive will continue the task and return a status of INTER-
MEDIATE and a service response of Linked Com m and Com plete.
If the Link bit and the Flag bit of the Control word are both set to
one, and the drive com pletes a com m and with a status of INTERME-
DIATE, the drive will return a service response of Linked Com m and
scription.
Flag Bit
The Flag bit is used in conjunction with the Link Bit to notify the ini-
tiator in an expedient m anner that a com m and has been com pleted.
Aflag bit set to 1 is valid only when the Link Bit is set to 1.
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SCSI Description
SCSI message-level errors are communicated by messages that are defined specifically
for that purpose. SCSI command-level errors are communicated by a status that is
returned by the drive during the STATUS phase. This phase occurs at the end of each
command, unless the command is terminated by one of the following events:
• ABOR T TASK SET message
• ABOR T TASK message
• TAR GET RESET message
• CLEAR QUEUE message
• Unexpected disconnect
The status code is contained in bits 1 through 5 of the status byte. Bits 0, 6, and 7 are
Status Codes
00h
02h
GOOD
The drive successfully com pleted the com m and.
CHECK CONDITION
An Auto Contingent Allegiance (ACA) condition occurred.
The drive cannot service the com m and at the m om ent, and
its Com m and Descriptor Block has been discarded. The ini-
tiator can retry the com m and at a later tim e. This status is
returned when:
08h
BUSY
This status is returned for every com m and (except the last)
in a series of linked com m ands that was successfully com -
pleted. However, if the com m and is term inated with other
that GOOD status (such as CHECK CONDITION, RESERVA-
TION CONFLICT, OR BUSY), the INTERMEDIATE status is
not returned and the series of linked com m ands and the
task is ended.
10h
INTERMEDIATE
Another initiator has reserved the drive. (This status is nev-
er returned for INQUIRY or REQUEST SENSE com m ands.)
18h
28h
RESERVATION CONFLICT
TASK SET FULL
The drive cannot service the com m and at the m om ent, and
its Com m and Descriptor Block has been discarded. (Re-
turned for a tagged com m and when all of the drive's inter-
nal com m and buffers are in use, or when a host sends a
tagged com m and while an Auto Contingent Allegiance con-
dition is pending for that initiator)
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SCSI Description
Auto Contingent Allegiance condition (ACA) is the SCSI-3 term for the condition of
the drive immediately after it returns a CHECK CONDITION status code. While it
is in this condition, the drive:
• Keeps the status information (sense data) that characterizes the nature of,
and the reason for, the command's failure.
• Suspends execution of all commands that were queued behind the
command that failed (includes commands from all initiators, tagged or
untagged).
• Discards and returns BUSY status for both tagged and untagged drive
access commands from other initiators.
The Auto Contingent Allegiance condition remains in effect until cleared by one of
the following:
• TAR GET RESET message received from any initiator
• ABOR T TASK SET message received from the allegianced initiator
• Subsequent command received from the allegianced initiator
After receipt of an ABOR T TASK SET message from the “allegianced” initiator, the
drive clears any queued command sourced by that initiator and processes the
remaining queued commands.
For Parallel SCSI, as its first action following receipt of the CHECK CONDITION
status code, the initiator sends a REQUEST SENSE command to retrieve the sense
data. Any other command from the initiator causes the drive to set the sense key to
NO SENSE and the additional sense code to NO ADDITIONAL SENSE
INFORMATION. These actions happen prior to resuming execution of queued
commands, or, if there are no commands queued, before processing a new command.
Also for Parallel SCSI, after receipt of the R EQUEST SENSE command or any other
command from the “allegianced” initiator, the drive resumes processing of the queued
commands in the normal manner if the QErr bit in the MODE SELECT Control
Mode page is set to 0, its default value. If the value of QErr is 1, the drive aborts all
queued commands and generates a Unit Attention condition for initiators with
commands in the queue. A Unit Attention condition is not generated for the
“allegianced” initiator if commands belonging to it are flushed from the queue.
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SCSI Description
Under SCSI-2 processing, the Extended Contingent Allegiance condition extends
Contingent Allegiance handling so the initiator has explicit control over the point at
which suspended (queued) commands are resumed. It allows the initiator to send a
R EQUEST SENSE command and then send the non-tagged commands to access the
drive’s medium.
This action is provided to fix damage left by the failed command before permitting the
drive to continue with processing the queued commands.
The Extended Contingent Allegiance condition is enabled and disabled by the EECA
bit in the MODE SELECT Control Mode page. The Extended Allegiance Condition
differs from the Contingent Allegiance in that, under the Extended Contingent
Allegiance condition:
• The drive sends an INITIATE R ECOVER Y message to the allegiance
initiator prior to returning the failed command’s COMMAND
COMPLETE message. If the initiator rejects the INITIATE
R ECOVER Y message, the drive drops back to contingent allegiance
level of operation for the current error.
• An ABORT message does not terminate the extended contingent
allegiance condition.
• Non-tagged drive access commands from the “allegianced” initiator are
accepted by the drive and take priority over all queued commands.
QUEUE FULL status is returned if the host sends a tagged command.
• The drive delays resuming or aborting the queued commands until a
R ELEASE R ECOVERY message is received from the initiator.
The extended contingent allegiance condition remains in effect until cleared by one
of the following:
• Hard reset
• BUS DEVICE RESET message from any initiator
• R ELEASE R ECOVERY message from the “allegianced” initiator
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SCSI Description
An I/ O Process (task) may contain multiple commands that are linked together. The
initiator communicates this condition of linked (or unlinked) commands by setting (or
clearing) the Link bit of the Command Descriptor Block’s control word. A linked
command is one in which the Link bit in the Command Descriptor Block is set.
After successful completion of a linked command the drive sends an
INTER MEDIATE status, followed by a LINKED COMMAND COMPLETE
message. If the Flag bit was set in the Command Descriptor Block, the drive sends an
INTER MEDIATE status, followed by a LINKED COMMAND COMPLETE
(WITH FLAG) message. The drive then switches the bus to the command phase in
order to receive the next command in the linked chain.
All commands in a linked chain are addressed to the same nexus and are part of a single
task (I/ O process). The drive defers any commands that are not part of the linked chain
until the chain is complete. The last command in the chain has the Link bit cleared.
R elative addressing is not supported by the Atlas 10K III disk
drive.
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SCSI Description
Many of the SCSI commands cause data to be transferred between the initiator and
Block field used by the drive to determine how much command-related data are to
be transferred. The units (bytes or logical blocks) for the different Length fields are
Length Fields
Allocation Length
Param eter List Length
Bytes of data the drive is allowed to send to the initiator
Bytes of data the initiator has available for the drive
Logical data sectors the initiator wants transferred or verified
Bytes of data the initiator wants transferred
Transfer Length
Byte Transfer Length
initiator as part of the command. The DATA IN column lists the information sent to
the initiator by the drive.
Numbers in parentheses after an item indicate the item’s length in bytes. In some cases,
additional length information is communicated during the DATA phase. For example,
a FOR MAT UNIT Defect List Header contains a Defect List Length field that
contains the total length of the Defect Descriptors that follow the Defect List Header.
DATA-Phase Command Contents
CHANGE
DEFINITION
0
--
--
Defect List Header
FORMAT UNIT
INQUIRY
0
Initialization Pattern (6-8)
Defect Descriptors
Standard Inquiry or a Vital Prod-
uct Data page
Allocation
---
Param eter List
(m ust be 0)
LOG SELECT
LOG SENSE
--
--
Allocation
---
Log Page
Mode Param eter Header
(4 Block Descriptor (8
Page(s))
Param eter List
MODE SELECT
--
Allocation
Transfer
---
MODE SENSE
Block Descriptor (8)
PERSIST. RES. IN
PERSIST. RES.
OUT
READ (6) (10)
---
Data
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SCSI Description
READ BUFFER Header (4)
Mode-zero Buffer (512) or
Section of Drive’s DRAM or
READ BUFFER Desc. (4)
READ BUFFER
Allocation
---
READ CAPACITY
Allocation
Allocation
---
---
READ CAPACITY data (8)
READ DEFECT
DATA
• Defect List (Hdr) (4)
• Defect Descriptors
• Data (512
• LBA Tag (2)
• EDC (2)
Byte Transfer
(Must be 562)
READ LONG
---
• ECC (46)
READ SKIP MASK
REASSIGN
BLOCKS
0
Defect List Header(4)
Defect Descriptors
RECEIVE
DIAGNOSTIC
RESULTS
Diagnostic Page
Allocation
0
---
---
• ECC (25)
RELEASE
---
REPORT DEVICE
IDENTIFIER
REQUEST SENSE
Allocation
---
---
Sense Data (18)
---
0
(Extent List
Option not
supported)
RESERVE
REZERO UNIT
Com m and
0
---
---
Length in CDB
0
Data Out (To Drive)
---
Data In (To Initiator)
SEEK (6)(10)
---
---
SEND DIAGNOS-
TIC
Param eter List
Diagnostic Page
SET DEVICE
IDENTIFIER
START STOP UNIT
0
0
---
---
---
---
SYNCHRONIZE
CACHE
TEST UNIT READY
VERIFY
0
---
---
---
---
Transfer
Transfer
Data
Data
WRITE (6)(10)
WRITE AND VERI-
FY
Transfer
Data
---
---
Zeros (4)
Mode-zero buffer (512)
or Data to put into DRAM
or Microcode im age
(262,144)
or Microcode im age
(successive 16 KB pieces)
Param eter List
WRITE BUFFER
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SCSI Description
• Data (512)
• LBA Tag (2)
• EDC (2)
Byte Transfer
(m ust be 560)
WRITE LONG
--
• ECC (44)
0
Data (1 logical sector)
WRITE SAME
WRITE SKIP MASK
The SCSI command descriptions that follow this page contain detailed information
about the SCSI commands that are supported by the drive. Each description provides
a Data Format and Field Descriptions for the Command Descriptor Block for the
described command.
The commands are presented in alphabetic order, and each command starts on a new,
odd-numbered page.
Common Fields
Several fields that are common to many commands are described here, rather than
being repeated throughout the descriptions. These fields include:
Reserved – R eserved bits, fields, bytes, and code values are set aside for future
standardization and must be set to 0. If the drive receives a command that contains
non-0 bits in a reserved field or a reserved code value, the command is terminated with
a CHECK CONDITION status and the sense key set to ILLEGAL R EQUEST.
However, there are some fields that are not checked for compatibility with older SCSI
initiators.
Control – The Link Bit and Flag Bit are supported.
RelAdr – Not supported; m ust be 0.
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SCSI Description
SCSI compliance for disk drives with parallel SCSI interfaces to one of four different
levels: SCSI-1, SCSI-1/ CCS, SCSI-2 or SCSI-3.
CHANGE DEFINITION Command Descriptor Block-Data Format
0
Operation Code (40h)
Reserved
1
2
3
Reserved
Save
Rsv’d
New Operating Definition
(0, 1, 2, 3, or 4 are legal values for Parallel SCSI Disk Drives)
4 - 7
Reserved
Param eter Data Length
Control
8
9
CHANGE DEFINITION-Field Descriptions
Save Param eters. When this field is set to 1, the
new operating definition is saved in the drive's
non-volatile m em ory.
Save
The values that can be supplied in the field are
listed below:
0 Current Definition
New Operating Definition
Param eter Data Length
1 SCSI-1
2 SCSI-1/CCS (Com m on Com m and Set)
3 SCSI-2
4 SCSI-3
Length, in bytes, of the param eter data.
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SCSI Description
The FOR MAT UNIT command formats the disk's storage media into initiator-
addressable logical blocks according to initiator-defined options. This command
ensures that the disk storage media is formatted so that all data sectors are accessible.
Any data residing on the disk before this command is invoked is lost.
This command repairs damage left by previous WR ITE LONG commands. The
WR ITE LONG command allows the initiator to deliberately corrupt a sector's ECC
or EDC.
The FOR MAT UNIT command updates the defective sector list, referred to as the
Grown Defect List, that is maintained by the drive. As described below, the drive gives
the initiator considerable control over this list. If certification is enabled, all initiator-
addressable logical blocks are verified, and bad sectors are reassigned and added to the
Grown Defect List.
During FOR MAT UNIT command processing, the drive ig-
nores the R ead/ Write AWR E and ARR E bits (from Error R e-
covery Mode page) and does auto-revectoring as needed.
The drive is physically formatted when it leaves the manufacturing facility. Therefore,
it is not necessary to reformat the drive before using it. If the logical sector size of the
drive is changed using the Block Descriptor of the MODE SELECT Command, it is
recommended (but not necessary) to reformat the drive.
The Immed bit that can be included in the FORMAT UNIT command parameter
list allows the initiator to control whether the drive returns completion status either
after fetching and validating the Command Descriptor Block and parameter list or
after the FOR MAT UNIT command completes. The FORMAT UNIT command
The time required for the FOR MAT UNIT command to format the disk primarily
depends on the capacity of the drive. The number of defects detected and the number
of defects already in the Primary and Grown Defect Lists also influence the time
required to format the drive. If the Disable Certification bit is set to 1, formatting time
is reduced.
Defective sectors on the drive are managed through two lists: the Primary Defect List
and the Grown Defect List. The Primary Defect List is created when the drive is
manufactured and is the drive's initial defect list. The Primary Defect List is not
affected by the FOR MAT UNIT command. Sectors listed in it are revectored by the
drive. The Grown Defect List contains a list of the sectors that have gone bad since
the drive's primary list was generated.
Defects are communicated in a data structure referred to as a Defect Descriptor. The
SCSI specification defines several Defect Descriptor formats. The FOR MAT UNIT
command recognizes defect descriptors in Block format, Bytes From Index format,
and Physical Sector format. (There is one exception: a value of FFFFFFFFh in either
the defect Bytes From Index field or the Defective Sector Number fields is ignored).
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SCSI Description
FORMAT UNIT Command Descriptor Block-Data Format
0
1
Operation Code (04h)
Reserved
Fm t
Cm p
List
Defect List Form at
Data
2
3 - 4
5
Vendor-Specific
Interleave
Control
FORMAT UNIT Command-Field Descriptions
Form at Data. When the Form at Data value is 1, it indicates that a data-out
buffer transfer occurs as part of the com m and execution. The FORMAT
UNIT Param eter list (consisting of a Defect List Header and, optionally, a
num ber of Block Form at Defect Descriptors) is passed to the device during
this phase.
Fm tData
When the Form at Data value is 0, the data-out buffer transfer does not oc-
cur.
Com plete List. When the Com plete List value is 1, the drive deletes its cur-
rent Grown Defect List and starts a new one, containing the Logical Block
Num bers listed in the defect list supplied by the initiator during this form at
operation are added to the list, creating a new Grown Defect List.
Cm pLst
When the Com plete List value is 0, the drive adds initiator-supplied and
newly found defective Logical Block Num bers to the existing Grown Defec-
tive List.
The Defect List Form at value specifies the defect descriptor passed by the
initiator to the drive when the Form at Data value is 1. Acceptable values
are:
Defect List Form at
000b (Block [
] Form at)
100b (Index Form at)
101b (Physical Sector Form at)
Vendor-Specific
Interleave
Not supported. Must be 0
Not supported. Ignored by the drive.
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SCSI Description
Five different forms of the FOR MAT UNIT command are supported through
different combinations of the Format Data bit, Complete List bit, and the information
in the Defect List Length field. (R efer to FORMAT UNIT Defect Header List for a
description of the Defect List Length field.) The different command forms give the
contents of the Grown Defect List after FOR MAT UNIT command execution.
FORMAT UNIT Command Supported Options
All sectors found to be bad, but not listed in the Prim ary Defect
0
1
0
0
N/A
0
List or Grown Defect List, are added to the Grown Defect List.
Sam e as above.
The existing Grown Defect List is discarded. A new Grown De-
fect List is generated, containing All sectors found to be bad, but
not listed in the Prim ary Defect List.
1
1
0
The Grown Defect List contains:
Original Grown Defect List
All sectors found to be bad, but not listed in the Prim ary Defect
List.
A list of sectors supplied by the initiator. These sectors are
passed in defect descriptors in the data-out buffer transfer that
occurs as part of the FORMAT UNIT com m and.
1
1
0
1
>0
>0
Sam e as the case above, except that the current Grown Defect
List is discarded before form atting begins.
bytes or eight bytes in length.
FORMAT UNIT Parameter List-Data Format
0 - 3
Defect List Header
Initialization Pattern Descriptor (if any)
Defect Descriptors (if any)
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SCSI Description
provides descriptions of the data fields in the Defect List Header
.FORMAT UNIT Defect List Header-Data Format
0
Reserved
STPF
Defect List Length
1
FOV
DPRY
DCRT
IP
DSP
Im m ed
VS
2-3
FORMAT UNIT Defect List Header-Field Descriptions
The Form at Options Valid bit indicates that the rem aining option bits in this byte
are valid. If this bit is not set, the rem aining bits, except Im m ed, are ignored.
FOV
during the form at to identify defective areas on the m edia. The drive's default
is 0, indicating that the drive should replace sectors found in the Prim ary Defect
List during the form at.
DPRY
The Disable Certification bit specifies whether the drive should certify the m edia
during the form at. The drive’s default is 0, indicating that the drive should certify
the m edia.
DCRT
STPF
The Stop Form at bit specifies the error conditions under which the drive is to
term inate the form at. The state of the bit is ignored and the drive acts as if this
bit is set. If either the Grown Defect List or the Prim ary Defect List is not found,
the form at operation term inates with a CHECK CONDITION status and a sense
key of MEDIUM ERROR
The Initialization Pattern bit signals the drive that the FORMAT UNIT Param eter
List contains initialization pattern inform ation.
An Initialization Pattern bit of 1 indicates that an initialization pattern descriptor
ing the Defect List Header.
IP
An Initialization Pattern bit of 0 indicates that an initialization pattern descriptor
will use its default initialization pattern of all zeros.
The Disable Saving Param eter prohibits the drive from preserving MODESELECT
param eters received while the Form at is in progress. This bit is ignored, and the
drive acts as if it were set.
DSP
When the Im m ediate bit is 0, the drive returns a status after the form at operation
com pletes. If the disconnect privilege is granted in the accom panying IDENTIFY
m essage, the drive disconnects from the bus after fetching and validating the
Com m and Descriptor Block and the FORMAT UNIT Param eter List. If the discon-
nect privilege is not granted, the drive stays connected to the bus during the
entire FORMAT UNIT com m and. When the Im m ediate bit is set to 1, the drive
returns a status after the Com m and Descriptor Block and FORMAT UNIT Param -
eter List have been fetched and validated. In this case, the drive ignores the
IDENTIFY m essage's disconnect privilege bit and rem ains connected to the bus
while it validates the Com m and Descriptor Block and Param eter List. It returns
the com pletion status before it disconnects. The drive then proceeds with the
form at.
Im m ed
VS
Vendor-specific. Must be 0.
that follow. A value of 0 is valid and m eans that no Defect Descriptors follow.
A CHECK CONDITION status is returned if this value is not a m ultiple of the de-
fect descriptor size. The Defect List Length is equal to four tim es the num ber of
defect descriptors if Block form at is used, or eight tim es if Bytes From Index for-
m at or Physical Sector form at is used.
Defect List Length
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SCSI Description
Each descriptor specifies a 4-byte defective sector address of the sector that contains
FORMAT UNIT Defect Descriptor-Block Format
0 - 3
Defective Block Address
The Physical Sector defect descriptor specifies the location of a defect that is the length
of a sector. The Bytes From Index defect descriptor specifies the location of a defect
that is no more than eight bytes long.
of Defect is the most significant part of the address, and the Defective Sector Number
or Defect Bytes From Index is the least significant part of the address. A value of
FFFFFFFFh in bytes 4 to 7 is ignored
FORMAT UNIT Defect Descriptor- Physical Sector and Bytes
From Index Format
0 - 2
Cylinder Num ber of Defect
Head Num ber of Defect
3
Defective Sector Num ber
or
Defect Bytes from Index
4 - 7
5-18
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SCSI Description
The Initialization Pattern option specifies that the logical blocks on the drive medium
will contain a specified initialization pattern. The Initialization Pattern descriptor is
the Initialization Pattern descriptors. The contents of the descriptor fields are described
FORMAT UNIT Initialization Pattern Descriptor-Data Format
0
IP Modifier = 0
Reserved
1
IP Type
IP Length
IP
2 - 3
4 - n
FORMAT UNIT Initialization Pattern Descriptor-Field Descriptions
IP Modifier
IP Type
The Initialization Pattern Modifier m ust be 0.
the drive uses to initialize each logical sector within the initiator-accessible
portion of the m edium . All bytes within a logical sector are written with the
initialization pattern.
The Initialization Pattern Length field indicates the num ber of bytes contained
in the Initialization Pattern. The valid lengths (when IP Type = 1) are two or
four bytes.
IP Length
IP
Initialization Pattern.
FORMAT UNIT Initialization Pattern Type
1
00h
01h
Use default pattern.
Repeat the initialization pattern as required to fill the logical
2
sector.
3
Reserved.
02h – FFh
NOTES:
1 If the Initialization Pattern Length is not 0, the drive terminates the command with
CHECK CONDITION status. The sense key is set to ILLEGAL REQUEST, and
the additional sense code is set to INVALID FIELD IN PAR AMETER LIST.
2 If the Initialization Pattern Length is 0, the drive terminates the command with
CHECK CONDITION status. The sense key is set to ILLEGAL REQUEST, and
the additional sense code is set to INVALID FIELD IN PAR AMETER LIST.
3 If the Initialization Pattern Type is not 0 or 1, the drive terminates the command
with a CHECK CONDITION status. The Sense Key is set to ILLEGAL R EQUEST,
and the Additional Sense Code is set to INVALID FIELD IN PAR AMETER LIST.
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SCSI Description
The INQUIRY command allows the initiator to determine the kind of SCSI devices
attached to its SCSI bus. It causes a device that is attached to a SCSI bus to return
information about itself. The drive identifies itself as a Direct Access Storage Device
that implements the applicable interfacing protocol. The drive does not need to access
its storage medium to respond to the inquiry. The INQUIR Y commands are
The drive can provide two categories of data in response to an INQUIR Y command:
Standard Inquiry Data and Vital Product Data. Standard Inquiry Data contains basic
data about the drive, and Vital Product Data comprises several pages of additional data.
Each Vital Product Data page requires a separate INQUIRY command from the
initiator.
An INQUIR Y command is not affected by, nor does it clear, a Unit Attention
condition.
INQUIRY Command Descriptor Block-Data Format
0
Operation Code (12h)
Reserved
1
2
3
4
5
Cm dDt
EVPD
Page Code or Operation Code
Reserved
Allocation Length
Control
INQUIRY Command Descriptor Block-Field Descriptions
Com m and Support Data. If Cm dDt = 0 and EVPD (see below) = 0, the drive
returns the Standard Inquiry Data. If Cm dDt = 1 with EVPD = 0, the drive
returns the Com m and Data specified by Page Code/Operation.
Cm dDt
EVPD
Enable Vital Product Data. If EVPD = 0 and Cm dDt (see above) = 0, the drive
returns the Standard Inquiry Data. If EVPD = 1and Cm dDt = 0, the drive re-
turns the Vital Product Data Page specified by Page Code/Operation Code.
Specifies the Vital Product Data Page or Com m and Support Data which is to
be returned by the drive when EVPD is set. Specifies the SCSI Operation Code
for com m and support data to be returned by the drive when Cm dDt is set. A
CHECK CONDITION status is returned if this field specifies an unsupported
drive.
Page Code or
Operation Code
Specifies the num ber of bytes of inquiry inform ation the drive is allowed to
return to the initiator during the com m and's data-in buffer transfer. Error sta-
tus is not returned if the value in this field truncates the requested inform a-
tion.
Allocation Length
5-20
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SCSI Description
The Standard Inquiry Data Page is returned by the drive in response to the INQUIRY
Standard Inquiry Data Page-Data Format
Peripheral Device Type = 0
Peripheral Qualifier = 0
0
1
2
(Direct Access Device)
RMB =
Device Type Modifier = 0
0
ANSI Version = 3
ISO Version = 0
ECMA Version = 0
Norm
ACA
= 0
(SCSI-3)
AERC
= 0
Trm Tsk
= 0
3
Rsv’d
Response Data Form at = 2
4
5
Additional Length = 5Bh
Reserved
Mch-
ACKQ-
REQQ
= 0
Port
= 0
MultiP
6
7
Rsv’d
Rsv’d
ngr
Addr32
= 0
Addr16
= 0
Wbus3
2
= 0
Trans-
Dis
= 1
Cm -
dQue
= 1
Wbus1
6
RelAdr
= 0
Sync
= 1
Linked
= 1
SftRe
= 0
8 - 15
16 - 31
32 - 35
36 - 47
48 - 51
52 - 53
54
Vendor Identification “MAXTOR”
Product Identification
Product Revision Level
Drive Serial Num ber
Reserved
SCSI Hardware Revision Num ber
Disk Controller Hardware Revision Num ber
Electronics Pass Num ber
55
56
Reserved
Clocking
QAS
IUS
57 - 95
Reserved
Standard Inquir Data Page-Field Descriptions
Peripheral Qualifier
Peripheral Device
ANSI Version
AERC
0
0
3
0
0
0
0
0
Non-zero if initiator selects an invalid logical unit.
0 indicates that this is a Direct Access Device.
ANSI SCSI Level 3 (SCSI-3) is supported.
Asynchronous Event Reporting is not supported.
Norm ACA
Port
Does not support setting NACA in CDB Control word.
Only used when MultiP = 1.
MultiP
This field set to 1 if it is a m ultiport device.
Not em bedded in or attached to a m edium changer
Mchngr
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SCSI Description
ACKQREQQ
Addr32
0
0
Device supports REQ and ACK data handshake on Q cable.
32-bit wide SCSI address
Addr16
0/1
0
16-bit wide SCSI address
Trm TSK
TERMINATE TASK Function is not supported
Response Data For-
m at
This Standard Inquiry Data is in the form at specified in the International
Standard.
2
RelAdr
0
0
Relative Addressing is not supported.
32-bit wide bus is not supported.
WBus 32
The WBus bit is 1 if the drive supports 16-bit data transfer. The bit is 0
if the drive only supports 8-bit transfer.
WBus 16
0 or 1
Sync
1
1
The drive supports Synchronous Data Transfers.
Linked Com m ands are supported.
Linked
Indicates that the drive supports CONTINUE TASK and TARGET
TRANSFER DISABLE m essages.
TransDis
Cm dQue
SftRe
1
1
0
0
The drive supports Tagged Com m and Queuing
The drive im plem ents the hard reset option in response to assertion of
the SCSI Bus reset line.
VS
Vendor Specific
The
value in
this field
is:
ATLAS10K3_18_WLS, ATLAS10K3_36_WLS, ATLAS10K3_73_WLS
ATLAS10K3_18_SCA, ATLAS10K3_36_SCA, ATLAS10K3_73_SCA
Product
Identification
The contents of this field define the setting of the double-edge clocking
option (See Chapter 6). Note that the clocking field does not apply to
asynchronous transfers of data. Options available are:
Clocking
11
00b
Indicates the device server supports only Single
Transition (ST)
01b
10b
11b
Indicsates the device server supports only Double
Transition (DT)
Reserved
Indicates the device server supports ST and DT
Quick Arbritrate Support. If the value of this field is 1, it indicates that
the device server supports the quick arbitrate feature. A value of 0 in-
dicates that the device server does not support this feature. 0 is default
setting.
0
QAS
IUS
(U160)
Inform ation Unit Supported. If the value of this field is 1, it indicates
that the device server supports inform ation units. A value of 0 indicates
that the device server does not support inform ation units. Default is 0.
1
(U320)
Vendor Information, Product Identification, and Product R evi-
5-22
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SCSI Description
The Vital Product Data pages that can be returned by the drive are described in the
pages.
Supported Vital Product Data Pages -Data Format
0
Peripheral Qualifier
= 0
Peripheral Device Type = 0
(Direct Access Device)
1
Page Code (00h)
2
3
Reserved
Page Length = 08h
4 - 10
Supported Page List
(see Table 5-14)
Vital Product Data-Page Codes
00h
80h
81h
82h
83h
C0h
C1h
C4h
Supported Vital Product Pages Page
Unit Serial Num ber Page
11
16
9
Im plem ented Operating Definition Page
ASCII Im plem ented Operating Page
Device Identification Page
32
28
40
20
8
Firm ware Revision Page
Maxtor Manufacturing Num ber Page
Negotiated Rate Inform ation Page
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SCSI Description
Unit Serial Number Page-Data Format
Peripheral Qualifier
= 000b
Peripheral Device Type = 000h
(Direct Access Device)
0
1
2
3
Page Code (80h)
Reserved
Page Length = 0Ch
HDA Serial Num ber
4 - 15
Unit Serial Number Page-Field Descriptions
HDA Serial Num ber
A 12-character ASCII representation of the drive’s HDA serial
num ber
5-24
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SCSI Description
The Implemented Operating Definition page reflects the current and available
Implemented Operating Definition Page-Data Format
0
Peripheral Qualifier
= 0
Peripheral Device Type = 0
(Direct Access Device)
1
2
3
4
5
Page Code (81h)
Reserved
Page Length = 05h
Rsvd
Current Definition
SavIm p
= 1
Default Definition is SCSI-3 (04h)
Default Definition is SCSI-3 (04h)
Default Definition is SCSI-2 (03h)
Default Definition is SCSI-1CCS (02h)
6
SavIm p
= 1
7
SavIm p
= 1
8
SavIm p
= 1
Implemented Operating Definition Page-Field Descriptions
Save Im plem ented. If = 0, this bit indicates
that the corresponding operation definition
cannot be saved. When = 1, this bet indicates
that the corresponding operating definition
can be saved.
SavIm p
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SCSI Description
The ASCII Implemented Operating Definition page returns the character string's
length (1Bh) in byte 4, followed by the appropriate character string (“SCSI-3, SCSI-
5-32.
ASCII Implemented Operating Definition Page - Data Format
0
Peripheral Qualifier
= 0
Peripheral Device Type = 0
(Direct Access Device)
1
2
3
4
Page Code (82h)
Reserved
Page Length = 1Ch
ASCII String Length = 1Bh
5 - 31
“SCSI-3, SCSI-2, SCSI-1/CCS” + byte of 0
5-26
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SCSI Description
The Device Identification Page provides the means to retrieve zero or more
Device Identification Page - Data Format
Peripheral Qualifier
(0)
Peripheral Device Type (0)
(Direct Access Device)
0
1
Page Code (83h)
2
Reserved
3
Page Length (24h for SCSI)
4
Reserved
Code Set (1)
Identifier Type (2)
5
6
Reserved
Reserved
Association (0)
Reserved
7
Identifier Length (8h)
8 – 15
16
EUI-64 (Value Stored in Configuration Page 30h)
Reserved Code Set (2)
Association (0) Identifier Type (1)
Reserved
Identifier Length (14h)
17
18
19
20 – 27
28 – 39
Vendor Identifier (“Maxtor “)
Drive Serial Num ber
U160 SCSI uses Quantum an the Vendor ID while U320 SCSI
uses Maxtor as the Vendor ID.
Device Identification Page-Field Description
This field specifies the code set used for the Identifier field. Applicable val-
ues are:
Value Description
0h Reserved
Code Set
1h The Identifier field contains binary values
2h The Identifier field contains ASCII graphic codes (code values 20h
through 7Eh)
3h – Fh Reserved
This field specifies the entity with which the Identifier field is associated.
Applicable values are:
Value Description
Association
0h The Identifier field is associated with the addressed physical or logical
device.
1h The identifier field is associated with the port that received the request.
2h – 3h Reserved
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SCSI Description
This field specifies the form at and assignm ent authority for the identifier.
Values in this field are:
Value Description
0h No assignm ent authority was used; there is no guarantee that the iden-
tifier is globally unique (vendor-specific).
1h The first 8 bytes of the Identifier field represent the Vendor ID.
2h The Identifier field contains an IEEE Extended Unique Identifier, 64-bit
(EUI-64). The Identifier Length field (Byte 7) is set to 8.
3h Not applicable; for Fibre Channel devices.
Identifier Type
4h Not applicable; if the Association value = 1h, the value of the Identifier
contains a 4-byte, binary num ber that identifies the port relative to the
other ports in the device.
5h - Fh Reserved
5-28
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SCSI Description
The Firmware Revision page reflects the current firmware revision and date and time
Firmware Revision Page-Data Format
0
Peripheral Qualifier
= 0
Peripheral Device Type = 0
(Direct Access Device)
1
2
Page Code (C0h)
Reserved
3
Page Length = 24h
4 - 19
20 - 39
Full Firm ware Version Blank Fill (e.g., “T382 “)
Build Date and Tim e Blank Fill (e.g., “J an 19 1999 07:18:15”)
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SCSI Description
part number assigned by Maxtor’s manufacturing group in accordance with vendor
requirements.
Maxtor Manufacturing Information Page-Data Format
0
Reserved
Page Code (C1h)
1
2
3
Reserved
Page Length = 10h
4 - 19
Spaces or Maxtor-Unique Inform ation
The value in the Bytes 4 - 19 field is assigned by Maxtor Corpo-
ration
5-30
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SCSI Description
Negotiated Rate Information Page-Data Format
0
Peripheral Qualifier
= 0
Peripheral Device Type = 0
(Direct Access Device)
1
2
3
4
5
6
7
Page Code (C4h)
Reserved
Page Length = 4h
Transfer Period Factor
REQ / ACK Offset
Rsvd
AIP
AIPD
Reserved
AIPCE
TWE
PARL
QAS
FAIR
DT
SYNC
IU
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SCSI Description
Negotiated Rate Information Page-Field Descriptions
Transfer Period Factor
REQ / ACK Offset
Applicable values of this field are provided in Appendix B.
This is the negotiated value of Req / Ack offset between the initiator and
the target. For Single Transition (ST) data transfers, the REQ/ACK Offset is
the m axim um num ber of REQ assertions allowed to be outstanding before
a corresponding ACK assertion is received at the target: Data transfer size
m ay be 1 or 2 bytes. For Double Transition (DT) data transfers, the REQ/
ACK Offset is the m axim um num ber of REQ assertions allowed to be out-
standing before a corresponding ACK assertion is received at the target:
Data transfer size is 2 bytes.
Asynchronous Inform ation Protection. If = 1, drive supports AIP. If = 0,
device does not support AIP.
AIP
Asynchronous Inform ation Protection Generation Disabled. If = 1, AIP gen-
eration is disabled. If = 0, AIP generation is enabled.
AIPD
AIPCE
Asynchronous Inform ation Protection Checking Enabled. If = 1, AIP protec-
tion is enabled. If = 0, AIP protection is disabled.
n
Transfer Width Exponent. The transfer width is 2 bytes. If set to 0, 1 byte
TWE
is selected; if set to 1, 2 bytes are selected.
Parallel Protocol. When = 1, this field indicates the negotiation occurred
with a Parallel Protocol m essage form at. When = 0, this field indicates the
negotiation occurred with a Synchronous Data Request m essage form at.
PARL
FAIR
Fairness. When set = 1, the Fairness algorithm is enabled. When set = 0,
the algorithm is disabled.
Synchronous Mode. When set = 1, the data transfer bus is operating in
synchronous m ode. When set = 0, the data transfer bus is operating in
asynchronous m ode.
SYNC
Quick Arbritrate Support Enable. When = 0, indicates that QAS is to be dis-
abled when received from initiator and that QAS is disabled when received
from target. When = 1, indicates that QAS is to be enabled when received
from initiator and that QAS is enabled when received from target. See
Appendix B.
QAS
(Note that the value of
this field m ust be 0 if the
value in PARL is 0)
Double Transition Enable. When = 0, indicates that DT DATA is to be dis-
abled when received from initiator and that DT DATA phases are disabled
when received from target. When = 1, indicates that DT DATA phases are
to be enabled when received from initiator and that DT DATA phases are
enabled when received from target. See Appendix B.
DT
(Note that the value of
this field m ust be 0 if the
value in PARL is 0)
Inform ation Units Enable. When = 0, indicates that inform ation unit trans-
fers will not be used when received from the initiator and that inform ation
unit transfers are disabled when received from the target. When = 1, indi-
cates that inform ation unit transfers will be used when received from the
initiator and that inform ation unit transfers are enabled when received from
the target. See Appendix B.
IU
(Note that the value of
this field m ust be 0 if the
value in PARL is 0)
5-32
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SCSI Description
An application client can request command support data by setting the CmdDt bit of
the INQUIR Y command to 1, and specifying the SCSI operation code of the
Command Descriptor Block (CDB) for which it wants information.
Command Support Data Page-Data Format
0
Peripheral Qualifier
= 0
Peripheral Device Type = 0
(Direct Access Device)
1
2
Reserved
ECMA Version
Reserved
Support
ISO Version
ANSI-Approved Version
3 – 4
5
CDB Size (m – 5)
(MSB)
6 – m
CDB Usage Data
(LSB)
Command Support Data Page-Field Descriptions
The value of the Support field describes the type of support that the disk
drive provides for Com m and Support Data.
Support
Value
Description
Data about the requested SCSIoperation
code is not currently available. In this
case, all data after Byte 1 is undefined.
000b
The device does not support the SCSI
operation code requested. In this case,
all data after Byte 1 is undefined
001b
010b
011b
Reserved
The device supports the SCSI operation
code in conform ance with the SCSI stan-
dard.
100b
101b
Vendor-Specific
The device supports the SCSI operation
code, but in a vendor-specific m anner
110b
111b
Vendor-Specific
Reserved
ISO-Version
Must be 0.
ECMA-Version
Must be 0.
ANSI-Approved
Version
Minim um operating definition for supported com m and.
This field contains the num ber of bytes in the CDB for the Operation Code
being requested and the size of the CDB Usage Data in the data that is
returned in response to the INQUIRY.
CDB Size
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SCSI Description
This field contains inform ation about the CDB for the Operation Code be-
ing queried. Note that the first byte of the CDB Usage Data contains the
OpCode for the operation specified. All of the other bytes of the CDB Us-
age Data contain a m ap for bits in the CDB of the OpCode specified.
CDB Usage Data
The bits in the map have a 1-to-1 correspondence to the CDB for the Op-
Code being queried. That is, if the device senses a bit as the entire field or as
part of the field of the operation, the map in CDB Usage Data contains a 1 in
the corresponding bit position. If the device ignores a bit or declares a bit as
“reserved” in the CDB for the OpCode being queried, the map has a 0 in that
for each of the OpCode values that can be sent in the INQUIR Y command.
Command Support Data Page Command or Operation Codes
00h
01h
03h
04h
TEST UNIT READY
REZERO UNIT
03
03
03
03
01
01
01
01
06
06
06
06
00E000000003
01E000000003
03E00000FF03
04FFFFFFFF03
REQUEST SENSE
FORMAT UNIT
REASSIGN
BLOCKS
07h
03
01
06
070E00000003
08h
0Ah
0Bh
12h
READ (6)
WRITE (6)
SEEK (6)
INQUIRY
03
03
03
03
01
01
01
01
06
06
06
06
08FFFFFFFF03
0AFFFFFFFF03
0BFFFFFF0003
12E3FF00FF03
MODE
SELECT (6)
15h
03
01
06
15F10000FF03
16h
17h
1Ah
RESERVE (6)
RELEASE (6)
03
03
03
01
01
01
06
06
06
16FEFFFFFF03
17FEFF000003
1AE8FF00FF03
MODE SENSE (6)
START STOP
UNIT
1Bh
1Ch
1Dh
25h
28h
2Ah
03
03
03
03
03
03
01
01
01
01
01
01
06
06
1BE100000103
1CE1FFFFFF03
1DF700FFFF03
REC. DIAG.
RESULTS
END
DIAGNOSTIC
06
READ
CAPACITY
25E0FFFFFFFF00
000103
0A
0A
0A
28F8FFFFFFFF00F
FFF03
READ (10)
WRITE (10)
2AF8FFFFFFFF00
FFFF03
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SCSI Description
2BE0FFFFFFFF00
000003
2Bh
2Eh
2Fh
35h
37h
3Bh
3Ch
3Eh
3Fh
40h
41h
SEEK (10)
03
03
03
03
03
03
03
03
03
03
03
01
01
01
01
01
01
01
01
01
01
01
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
0A
WRITE AND
VERIFY
2EF2FFFFFFFF00F
FFF03
2FF2FFFFFFFF00F
FFF03
VERIFY
35E0FFFFFFFF00
FFFF03
SYNCH. CACHE
READ DEFECT
DATA
37E01F00000000
FFFF03
WRITE
BUFFER
3BEFFFFFFE00FFF
FFF03
3CEFFFFFFFFFFFF
FFF03
READ BUFFER
READ LONG
3EE2FFFFFFFF00F
FFF03
3FE0FFFFFFFF00F
FFF03
WRITE LONG
CHANGE DEF.
WRITE SAME
40E0017F000000
000003
41E2FFFFFFFF00
FFFF03
4CE3C00000000
0FFFF03
4Ch
4Dh
LOG SELECT
LOG SENSE
03
03
01
01
0A
0A
4DE1FF00000000
FFFF03
55h
56h
57h
5Ah
5Eh
5Fh
A0h
MODE SELECT
(10)
03
03
03
03
03
03
03
01
03
03
01
03
03
03
0A
0A
0A
0A
0A
0A
0C
5510000000000
0FFFF03
RESERVE (10)
5610FFFF000000
FFFF03
RELEASE (10)
5710FFFF000000
FFFF03
MODE SENSE (10)
5AE8FF0000000
0FFFF03
PERSIST.
RES. IN
5E1F0000000000
FFFF03
PERSIST.
RES. OUT
5F1FFF00000000
FFFF03
REPORT LUNS
A00000000000F
FFFFFFF0003
E8h
EAh
SKIP READ (10)
SKIP WRITE (10)
03
03
01
01
0A
0A
E8E0FFFFFFFFFFF
FFF03
EAE0FFFFFFFFFFF
FFF03
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SCSI Description
The drive collects and stores performance data and error summaries in counters. The
LOG SELECT command is used to zero these counters. The LOG SELECT
command is a complementary command to the LOG SENSE command. The format
LOG SELECT Command Descriptor Block-Data Format
0
Operation Code (4Ch)
1
2
Reserved
PCR
SP
PC
Reserved
3 – 6
7 – 8
9
Reserved
Param eter List Length
Control
LOG SELECT Command Descriptor Block-Field Descriptions
Param eter Code Reset. Must be 1. Causes all
the im plem ented counters to be set to 0.
PCR
Save Param eters. A value of 1 indicates that
certain counters are to be cleared from non-vol-
atile m em ory.
SP
PC
Page Control. Must be 01b OR 11b.
Param eter
List Length
Must be 0.
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SCSI Description
Log Sense data pages require special interpretation and also are
subject to change. For assistance with the Log Sense data pages,
contact your Maxtor Applications Engineer.
The drive collects operational information and stores these statistics as log data. Log
data are grouped by category into log pages. The LOG SENSE command allows an
initiator to retrieve the stored log data. The LOG SENSE command is a
complementary command to the LOG SELECT command.
Each log page contains one or more pieces of information. Each piece of information
is referred to as a parameter. There are two types of parameters: values and lists. In
general, error and performance counters are reported as values. For example, the count
of “Hardware Idled Due To Invalid Command” is returned as a 32-bit integer. Events
are reported as lists. For example, the last known failure might be reported with the
ASCII string “Last known failure code 960A(X)”.
Applications Engineer for more information.
Disk Drive Log Pages
00h
01h
02h
03h
05h
06h
07h
08h
0Fh
10h
Supported Log Pages
Buffer Overruns and Underruns
Write Error Counter
Read Error Counter
Verify Error Counter
Non-Medium Error Counter Page
Last n-Error Events Page
Form at Status Page
Application Client Page
Self Test Results Page
EWS Status
1
2Fh
36h
37h
38h
39h
3Ah
3Bh
3Dh
3Eh
1
1
1
1
1
1
1
1
Maxtor Reserved
Maxtor Reserved
Maxtor Reserved
Maxtor Reserved
Maxtor Reserved
Maxtor Reserved
Maxtor Reserved
Maxtor Reserved
Maxtor Reserved
3Fh
Page codes 2Fh, 31h, 35h, 36h, 37h, 38h, 39h, 3Ah, 3Bh, 3Dh, 3Eh,
and 3Fh are vendor-specific pages that are unique to Maxtor drives.
Contact your Maxtor representative for more information.
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SCSI Description
LOG SENSE Command Descriptor Block-Data Format
0
Operation Code (4Dh)
Reserved
1
2
PPC
SP
PC
Page Code
3 – 4
5 – 6
7 – 8
9
Reserved
Param eter Pointer
Allocation Length
Control
LOG SENSE Command Descriptor Block-Field Descriptions
The Param eter Pointer Control bit controls the type of param eters that can be
requested from the drive. This bit m ust be 0, indicating that all log param eters
for the specified page (subject to the allocation length specified) are returned
to the initiator.
PPC
The Save Pages bit specifies whether the param eters are to be saved. This
bit m ust be 0, indicating that no param eters are to be saved and are reset at
power-on or by a TARGET RESET.
SP
PC
The Page Control field defines the type of param eter values to be selected.
The field m ust be 01b indicating that the current values are to be returned.
Mode 11b (return default values) is not supported because all counters have
a default value of 0.
Page Code
Param eter Pointer
This field is related to the PPC field. This bit m ust be 0.
This specifies the num ber of bytes of data that the drive is allowed to pass
during the DATA IN phase. The requested page is truncated if its length ex-
ceeds the num ber of bytes specified in this field.
Allocation Length
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SCSI Description
The log pages that are returned from the drive have a common format that is shown
LOG SENSE Log Page Format-Data Format
0
1
Reserved
Page Code
Reserved
2 – 3
Page Length (n-3)
4 to
x+3
Log Param eter (first)
1
(length x)
n-
y+1
to n
Log Param eter (last)
1
(length y)
1Length x or y is the sum of parameter header and parameter data
value bytes.
LOG SENSE Log Page Format-Field Descriptions
Page Code
The allocation length for the page m inus the
4-byte header.
Page Length
One or m ore log data entities that are returned
as par of a Log Page. Each Log Param eter starts
with a 4-byte header followed by one or m ore
bytes of
data. In m ost cases, the param -
Log Param eter
eter value is a 4-byte longword that contains
the present value of an error or perform ance
generic log param eter.
Generic Log Parameter-Data Format
0 – 1
2
Param eter Code
ETC
DU
DS
TSD
TMC
LBIN
LP
3
Page Length (n-3)
Param eter Value
4 – n
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SCSI Description
Generic Log Parameter-Field Descriptions
A code which uniquely identifies each param eter on a given Log Page. For
exam ple, the code 8002h on the Seek Perform ance Sum m ary page reports
the average seek tim e while the sam e code on the Block Replacem ent Sum -
m ary page reports the num ber of blocks replaced.
Param eter Code
The following pages in this m anualcontain the lists ofapplicable param eters
for each Log page.
DU
DS
Disable Update. This param eter is 1 when updates are not enabled.
Disable Save. This param eter is 1 when param eters are not saved by the
drive.
Target Save Disable. This param eter is 0 indicating that the drive provides
a target-specific way of saving param eters.
TSD
ETC
TMC
Enable Threshold Com parison. This param eter is always 0. The drive does
not use thresholds for any of its param eters.
Threshold Met Com parison. This param eter is always 0. The drive does not
use thresholds for any of its param eters.
List in Binary. This bit only valid if LP = 1. If LP = 1 and LBIN = 0, then
the List Param eter is a string of ASCII graphic codes (code values 20h
through 7Eh). If LP = 1 and LBIN = 1, then the param eter is a list of binary
inform ation.
LBIN
LP
List Param eter. When 0, indicates that the param eter value for this param -
eter is a num eric
When LP is a 1, it indicates that the param eter value
is an alphanum eric ASCII-string
This param eter is always 0.
Param eter Length
Param eter Value
Specifies the length, in bytes, of the param eter’s value.
Contains the param eter’s current value when the PC field of the LOG SENSE
com m and is 01b.
The DU, DS, TSD, ETC, TMC and LP fields are collectively re-
ferred to as the Parameter Control Byte. This byte generally has
a value of 0; however, if the page is non-volatile but the drive is
not spun up or the GLTSD bit is set in Mode Page 0Ah, then the
value would be 20h. If the page is volatile, then the value is 60h.
5-40
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SCSI Description
SCSI refers to the drive’s operational parameters as its mode parameters. SCSI groups the
mode parameters by function into a set of data structures referred to as mode pages. The
MODE SELECT (6) command allows the initiator to modify some of these mode
pages and thereby control some of the drive’s operational characteristics. The Save
Page (SP) option in the Command Descriptor Block makes the changes permanent.
The new mode parameters are then stored in the drive’s non-volatile memory. The
MODE SELECT (6) Command Descriptor Block-Data Format
0
Operation Code (15h)
1
2 – 3
4
Reserved
PF
Reserved
Reserved
SP
Param eter Length List
Control
5
MODE SELECT (6) Command Field Descriptions
Page Form at. The drive ignores the content of this field and produc-
es a m ode param eter list that contains a m ode header optionally
followed by a sector descriptor and one or m ore pages that con-
form to the form at shown here.
PF
SP
Save Pages. When SP = 0, the drive perform s the specified MODE
SELECT operation and does not save any pages. When SP = 1, the
drive perform s the specified operation and stores allsavable pages,
(PS =1 on MODE SENSE return) including any sent during the data-
out buffer transfer. The changes m ade when SP = 1 becom e per-
m anent changes to the drive’s SCSI setup.
This field tells the drive how m any bytes of Mode Param eters to
fetch in the data-out buffer transfer. A CHECK CONDITION status
is returned if this value truncates a page.
Param eter List Length
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SCSI Description
change these pages by supplying them, with the desired changes included, in the
MODE SELECT command’s data-out buffer transfer.
The initiator should first use a MODE SENSE command to read the appropriate pages
and leave non-changeable values as read when the initiator subsequently writes the
changeable pages with the MODE SELECT command. If a non-changeable field
contains an invalid value, the drive returns a CHECK CONDITION status.
Initiator-Changeable Mode Pages
Unit Attention report-
ing (enables or dis-
ables)
00h
Unit Attention Control Page
4
Medium Access Error
recovery and report-
ing procedures for
READ and WRITE
com m ands
Read-Write Error RecoveryPage
01h
02h
12
16
Bus behavior during
data transfers
Disconnect-Reconnect Page
Verify Error Recovery Page
Medium Access Error
recovery and report-
ing procedures for the
VERIFY com m and
1
12
07h
1
Caching Page
Cache policy
20
12
08h
Com m andprocessing
policy
1
Control Mode Page
0Ah
Drive geom etry re-
porting
2
0Ch
10h
19h
24
24
8
Notch and Partition Page
Controls XOR operat-
ing param eters
XOR Control Page
Port Control Page
Defines port control
param eters
Enable and set tim e
intervals for Idle and
Standby m odes
1Ah
Power Condition Page
12
Inform ation Exceptions Control
Page and operations of specific
inform ational exception condi-
tions.
Defines m ethods to
control reporting
1Ch1
39h
12
22
Maxtor-Unique Page
NOTES:
1. This page is not supported by the SCSI-1/ CCS Operating Mode.
2. The Notch and Partition page is changeable but NOT savable.
3. XOR is currently disabled and page is not changeable.
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SCSI Description
The drive maintains three distinct sets of mode pages. They are the current page, the
default page, and the saved page. The drive also reports a fourth set of changeable pages.
Mode Page Types
The
m ode page set applies to all
and defines the drive’s m ode. The
SCSI-2 specification states that a drive can m aintain Mode param eters on a per-ini-
tiator basis if it so chooses. The Drives do not support this option.
The
m ode page set contains the values supplied in the last MODE SELECT
com m and received from an initiator. If no initiator has sent a MODE SELECT com -
m and since the drive was last reset or powered up, the current pages contain
Current
•
values if saved pages exist (from a previous MODE SELECT com m and SP
param eter).
•
values if pages have never been saved.
The drives generate a Unit Attention condition for all initiators (except for the one
that was the source of the MODE SELECT com m and) whenever one initiator m odi-
fies the Mode param eters.
The
m ode page set contains the factory default values that are listed in each
Default
Saved
page’s description.
The
m ode page set contains values preserved in the drive’s non-volatile m em -
ory by a previous SP-m odified MODE SELECT com m and.
The
m ode page set provides a m eans for an initiator to determ ine which
pages it is allowed to change and the specific bits within those pages that it is al-
lowed to change. This page set is read-only and is fetched with a MODE SENSE com -
m and.
Changeable
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SCSI Description
field descriptions for the Mode Parameter Block Descriptor.
Mode Parameter List-Data Format
0 – 3
4 – 11
Mode Param eter Header
Block Descriptor
(optional)
4 – n
or
12 – n
Page(s)
(optional)
Mode Parameter List-Field Descriptions
Contains inform ation about the rem ainder of
the param eter list and is always present (see
Mode Param eter Header
Allows the initiator to set the drive’s Logical
Block Size and num ber of Logical Block Ad-
Block Descriptor
Page(s)
The page code(s) of the pages that are a part of
this com m and.
Mode Parameter Header (6-Byte)-Data Format
0
1
2
3
Mode Data Length
Medium Type
Device-Specific Param eter
Block Descriptor Length
Mode Parameter Header- Field Descriptions
Mode Data Length
Reserved. Must be 0.
Ignored by the drive.
Ignored by the drive.
Medium Type
Device-specific Param eter
Zero (0) if no Block Descriptor is supplied. The
length is eight (8) if a Block Descriptor is sup-
plied.
Block Descriptor Length
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SCSI Description
Mode Parameter Block Descriptor-Data Format
0
Density Code
Num ber of Blocks
Reserved
1 – 3
4
5 – 7
Block Length
Mode Parameter Block Descriptor-Field Descriptions
Density Code
Num ber of Blocks
Block Length
Ignored by the drive.
This field specifies the num ber of logical blocks on the unit that are affected
by the current MODE SELECT com m and.
When this field is 0, the MODE SELECT param eters are put into effect for
all logical blocks on the unit.
The m axim um value allowed is the totalnum ber of initiator-addressable log-
ical blocks for the value specified in the Block Length field.
A value that is less than the m axim um value will decrease the num ber of
initiator-accessible logical blocks to the am ount specified.
This field specifies the length, in bytes, of each logical sector.
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SCSI Description
The drive’s changeable pages are described on the following pages. The data fields for
Categories of Changeable Pages
A field in this category can be m odified by the MODE SELECT com m and, can be
saved and can affect the drives processing. The drive uses the value in the field and,
if the SP bit is set, preserves the new value of the field in non-volatile m em ory on
the drive. (The PS bit m ust have been set when the m ode page was returned with a
MODE SENSE com m and.)
Fully Supported
A field in this category is fully supported, with one exception; the drive does not save
the field contents. The drive does not give an error indication if an attem pt is m ade
to save a tem porary field.
Tem porary
Ignored
Tem porary fields are also underlined in the Mode Param eter Page illustrations but the
PS bit is not.
A value in this field is never used or validated; it is never looked at by the drive. Ig-
nored fields are not underlined in the Mode Param eter Pages’ figures or tables and
are not described in the Field Description tables.
5-46
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SCSI Description
The Unit Attention Page is used to enable or disable the generation of Unit Attention
Conditions. The Unit Attention Condition Page format and field descriptions are
Unit Attention Condition Page (Page 0)
0
1
2
3
PS
Rsvd
Page Code (00h)
Page Length (02h)
Reserved
DUA
Reserved
Reserved (00h)
Unit Attention Condition Page (Page 0)
Param eters Savable. This bit is only used with the MODE
SENSE com m and. A returned value of 1 indicates that the tar-
get is capable of saving the page in a non-volatile, vendor-
specific location. The bit is reserved with the MODE SELECT
com m and.
PS
1
0
Disable Unit Attention. When set to the default value of 0,
the drive reports a CHECK CONDITION for any UNIT ATTEN-
TION condition (power-on, SCSI bus reset, etc.)
DUA
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SCSI Description
The R ead-Write Error R ecovery page controls the drive’s response to error
conditions that arise during the course of R EAD (6), R EAD (10), WRITE (6),
WR ITE (10) command processing and during the write portion of WR ITE AND
VER IFY command processing. The Read-Write Error R ecovery page format and
Read-Write Error Recovery Page-(Page 1)
0
1
2
3
4
5
6
7
8
9
PS
Rsvd
Page Code (01h)
Page Length (0Ah)
RC EER
AWRE
ARRE
TB
PER
DTE
DCR
Read Retry Count
Correction Span
Head Offset Count
Data Strobe Offset Count
Reserved
Write Retry Count
Reserved
10 –
11
Recovery Tim e Lim it
Read-Write Error Recovery Page-(Page 1)
Param eters Savable. This bit is only used with the MODE SENSE com m and.
A returned value of 1 indicates that the target is capable of saving the page
in a non-volatile, vendor-specific location. The bit is reserved with the
MODE SELECT com m and
PS
1
1
Autom atic Write Reallocation Enable. When the value is 1, it causes the
drive to autom atically reallocate bad sectors encountered during a write op-
eration. If it succeeds in replacing the bad sector, the drive adds the revec-
tored sector’s Logical Block Num ber to the Grown Defect List. Reallocation
is done only when the drive is able to recover the sector’s data unless the
HrdBBR bit of the Maxtor (Vendor) Special Function Control Page is set.
When AWRE is 0, the drive does not autom atically reallocate bad sectors
encountered during a write operation. See also Maxtor-Unique Page 39h.
AWRE
Autom atic Read Reallocation Enable. When the value is 1, it causes the
drive to autom atically reallocate bad sectors encountered during a read op-
eration. If it succeeds in replacing the bad sector, the drive adds the revec-
tored sector’s Logical Block Num ber to the Grown Defect List. Reallocation
is done only when the drive is able to recover the sector’s data unless the
Reallocate Uncorrected Errors bit of the Maxtor (Vendor) Special Function
Control Page is set.
ARRE
1
0
When ARRE is 0, the drive does not autom atically reallocate bad sectors en-
countered during a read operation. See also Maxtor-Unique Page 39h
(RUEE).
Transfer Block. When the value is 1, the drive sends best-guess inform ation
to the initiator when it encounters a defective sector whose data cannot be
fully recovered.
TB
When the value is 0, data that cannot be fully recovered is not returned to
the initiator.
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SCSI Description
Read Continuous. When the value is 0, the drive attem pts error recovery
when it encounters an error. When the value is 1, the drive suppresses error
recovery.
RC
0
0
EER
Enable Early Recovery.
Post Error Recovery. When the value is 0, the drive returns a GOOD status
in cases where error recovery is invoked and successful.
PER
DTE
DCR
0
0
0
When the value is 1, the drive returns a CHECK CONDITION status for re-
covered errors, sets the sense key to RECOVERED ERROR, and posts the
appropriate additional sense key.
Disable Transfer on Error.
Disable Correction. When the value is 0, ECC correction is applied as a
m eans of recovering erred data. On write operations, a valid ECC is written
to each data sector regardless of the value in the DCR bit.
When the value is 1, ECC correction is disabled (but not retries or reads),
and ECC errors cannot be corrected. However, on-the-fly is always enabled.
Read Retry
Count
4
Specifies the num ber of retries attem pted for a failed read operation.
Specifies the m axim um num ber of bits in a data sector that the drive is al-
lowed to correct. A value less than the default value can cause an otherwise
correctable error to be reported as uncorrectable. If the initiator specifies a
value larger than the default value, the drive autom atically rounds down the
num ber to the default value. A value of 0 causes the drive to use the default
value. The drive ignores any value placed in this field.
Correction
Span
170
Head Offset
Count
0
0
8
Not supported by the drive.
Data Strobe
Offset Count
Not supported by the drive.
Write Retry
Count
Specifies the num ber of retries attem pted for a failed write operation.
Specifies the m axim um tim e, in m illiseconds, that a retry is attem pted on a
failed sector during a read or write operation. When the value is 0, it m eans
that there is no tim e lim it. The m inim um perm issible value, however, is 100
m illiseconds.
Recovery
Tim e Lim it
0
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SCSI Description
The Disconnect–R econnect Page provides the application client the means to attempt
to optimize the performance of the delivery subsystem. The data format and field
Disconnect–Reconnect Page (Page 2)
0
1
2
3
PS
Rsvd
Page Code (02h)
Page Length (0Eh)
Buffer Full Ratio
Buffer Em pty Ratio
Bus Inactivity Lim it
Disconnect Tim e Lim it
Connect Tim e Lim it
Maxim um Burst Size
4 – 5
6 – 7
8 – 9
10 – 11
12
EMDP
Fairness Arbitration
DIm m
Reserved
First Burst Size
DTDC
13
14 – 15
Disconnect-Reconnect-Field Descriptions (Page 2)
Param eters Savable. This bit is only used with the MODE SENSE com -
m and. A returned value of 1 indicates that the target is capable of sav-
ing the page in a non-volatile, vendor-specific location. The bit is
reserved with the MODE SELECT com m and.
PS
0
The Buffer Full Ratio indicates how full the buffer should be prior to re-
questing an interconnect tenancy. Applies to READ operations only.
The default of 0 indicates to the drive that it should use its default ratio.
Buffer Full
Ratio
0
0
0
The Buffer Em pty Ratio indicates how full the buffer should be prior to
requesting an interconnect tenancy. Applies to READ operations only.
The default of 0 indicates to the drive that it should use its default ratio.
Buffer Em pty
Ratio
The Bus Inactivity Lim it indicates the m axim um duration of any inter-
connect tenancy during which no data is transferred.
Bus Inactivity
Lim it
The Disconnect Tim e Lim it specifies the m inim um tim e, in 100 m icro-
second increm ents, that the drive waits after releasing the SCSI bus be-
fore reselecting. The drive supports a m axim um value of 0xFF. Values
greater than 0xFF are treated as 0xFF. The default value of 0 indicates
that the drive can reslect im m ediately after releasing the bus.
Disconnect
Tim e Lim it
0
0
Connect Tim e
Lim it
The Connect Tim e Lim it indicates the m axim um duration of a single in-
terconnect tenancy.
The Maxim um Burst Size
specifies the m axim um am ount of data that the drive will transfer dur-
ing a data phase before disconnecting from the bus, assum ing it was
given the disconnect privilege. This value is expressed in increm ents of
data sectors (that is, a value of 1 indicates 512 bytes, a value of 2 in-
dicates 1024 bytes). The default value of 0 indicates that there is no
lim it on the am ount of data transferred per connection.
Maxim um
Burst Size
0
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SCSI Description
EMDP
0
Enable MODIFY DATA POINTER.
Fairness
Arbitration
Indicates whether or not the target should use fair or unfair (e.g., prior-
ity) arbitration when beginning the interconnect tenancy.
111b
Value
000b
Description
Disables the fairness algorithm . A fixed priority schem e based on the
SCSI ID assigned is used.
Any non-zero value enables the fairness algorithm (SCSI SPI-2 ANSI
standard, Appendix B).
Non-Zero
Disconnect Im m ediate. When set to a 1, to reduce on-bus tim e, the
drive is forced to disconnect from the SCSI Bus after a SCSI Com m and
is received. Disconnect Im m ediate works only when a typical, error-free
com m and is received. Disconnect Im m ediate does not apply in excep-
tion conditions (for exam ple, SDTR received, error, etc.).
DIm m
DTDC
0
Data Transfer Disconnect Control. This field of three bits defines further restrictions
when a disconnect is perm itted. These are as follows:
Value
Description
Data transfer disconnect control is not used. Disconnect is controlled
by other fields in this page.
000b
A target will not attem pt to disconnect once the data transfer of a com -
m and has started until all data of the com m and has been transferred.
The connect tim e lim it and bus inactivity lim it are ignored during the
transfer.
001b
010b
011b
Reserved
A target will not attem pt to disconnect once the data transfer of a com -
m and has started, until the com m and is com plete. The connect tim e
lim it and bus inactivity lim it are ignored once the transfer has started.
This field indicates the m axim um am ount of data that a target m ay
transfer for a com m and during the sam e interconnect in which it re-
ceives the com m and.
First Burst
Size
0
Fully supported and temporary fields are underlined. Unsupport-
ed fields are not underlined. The PS bit is underlined, meaning
it will be set on a MODE SENSE command, since the page is
savable.
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SCSI Description
The Verify Error Recovery Page controls the drive’s response to error conditions that
arise during the VERIFY command and during the verify operation of the WRITE
AND VERIFY command. The Verify Error R ecovery Page is not supported in the
SCSI-1/ CCS Operating Mode. The data format and field descriptions are described
Verify Error Recovery Page-(Page 7)
0
PS
Rsvd
Page Code (07h)
Page Length (0Ah)
EER
1
2
3
Reserved
PER
DTE
DCR
Verify Retry Count
Verify Correction Span
Reserved
4
5 – 9
10 – 11
Verify Recovery Tim e Lim it
Fully supported and temporary fields are underlined. Informational fields are
not underlined. The PS bit is underlined, meaning it will be set on a MODE
SENSE command, since the page is savable
Verify Error Recovery Page-Field Descriptions (Page 7)
Param eters Savable. This bit is only used with the MODE SENSE com m and. A
returned value of 1 indicates that the target is capable of saving the page in a
non-volatile, vendor-specific location. The bit is reserved with the MODE SE-
LECT com m and.
PS
0
0
EER
Enable Early Recovery.
Post Error Recovery. When the value is 1, the drive returns CHECK CONDITION
status for recovered errors, sets the sense key to RECOVERED ERROR, and
posts the appropriate additional sense code.
PER
0
When set to the default value of 0, it causes the drive to return GOOD status in
cases where error recovery is invoked and is successful. The only recoverable
error that can occur during a VERIFY operation is a failed read that succeeds af-
ter retries.
DTE
DCR
0
0
Disable Transfer on Error.
Disable Correction. When the value is 1, it disables ECC correction (but not re-
tries) on the READ portion of a VERIFY operation. When set to the default value
of 0, the ECC correction is always applied as a m eans of recovering erred data.
Verify
Retry
Count
The Verify Retry Count specifies the num ber of retries that are attem pted per
sector on a failed READ portion of a VERIFY operation.
4
The Verify Correction Span specifies the m axim um num ber of bits in a sector
that the drive is allowed to correct. A value less than the default value can cause
an otherwise correctable error to be reported as uncorrectable. If the initiator
specifies a value larger than 80, the drive rounds down to 80 without reporting
the change. A value of 0 causes the drive to use its default value
Verify
Correction
Span
170
0
The Verify Recovery Tim e Lim it specifies (in m illiseconds) the m axim um tim e
that a retry is attem pted on a failed sector during the read portion of a verify
operation. The default value of 0 indicates that there is no tim e lim it. The m ini-
m um perm issible is 100 m illiseconds.
Verify
Recovery
Tim e Lim it
5-52
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SCSI Description
The Caching Page controls the drive’s cache management policy. The data format and
Caching Page-(Page 8)
0
1
PS
Rsvd
Page Code (08h)
Page Length (12h)
2
Reserved
Dem and Read Retention Priority
Disable Pre-Fetch Transfer Length
WCE
MF
RCD
3
Dem and Write Retention Priority
4 – 5
6 – 7
8 – 9
10 – 11
12
Minim um Pre-Fetch
Maxim um Pre-Fetch
Maxim um Pre-Fetch Ceiling
FSW
LBCSS
DRA
VS
VS
Reserved
13
Num ber of Cache Segm ents
Cache Segm ent Size
Reserved
14 – 15
16
17 – 19
Non-Cache Segm ent Size
NOTES:
Bytes 12 to 19 are returned only if the device operating definition is SCSI-3.
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SCSI Description
Caching Page-(Page 8)
Param eters Savable. This bit is only used with the MODE SENSE com -
m and. A returned value of 1 indicates that the target is capable of saving
the page in a non-volatile, vendor-specific location. Bit reserved with
MODE SELECT com m and.
PS
1
Write Cache Enable. The default value of 1 enables write-back caching
when processing a WRITE com m and. When set to 0 the drive returns a
GOOD status and COMMAND COMPLETE only after successfully writing
all the data to the m edia.
When WCE = 1, write-back caching is enabled while processing a WRITE
com m and. The drive returns a GOOD status and COMMAND COMPLETE
only after fetching the data from the initiator and placing it in the drive’s
cache m em ory.
WCE
1
Note: For m axim um data integrity, it is strongly recom m ended that when
WCE is set to 1, the Read-Write Error Recovery Page (01h) fields be set
as follows:
• AWRE to 1
• RC to 0
• DCR to 0
• Correction Span set to 170
• Head Offset to 0
• Servo Offset to 0
Multiplication Factor (value m ust be 0). The drive interprets the m inim um
and m axim um pre-fetch fields values in term s of the num ber of logical
blocks for each of the respective types of prefetch.
MF
0
0
Read Cache Disable. The default value of 0 enables the read cache capa-
bility and allows the drive to use cache-resident data or m edium data to
satisfy a READ com m and.
RCD
When the value is 1, read caching is disabled and the data returned in re-
sponse to a READ com m and is fetched from the m edium and not from the
drive’s cache m em ory.
This field advises the drive on the retention priority to assign data read into
the cache that has also been transferred from the drive to the initiator.
Dem and Read
Retention
Priority
0
Dem and Write
Retention
Priority
This field advises the drive on the retention priority to assign data written
into the cache that has also been transferred from the cache m em ory to
the m edium .
0
Disable
Pre-Fetch
FFFFh
This field specifies the selective disabling of anticipatory pre-fetch
on long transfer lengths. The value in this field is com pared to the num ber
of sectors requested by the current READ com m and. If the num ber of sec-
tors is greater the than the value specified, anticipatory pre-fetch is not
perform ed for the com m and. When 0, anticipatory pre-fetch is disabled.
Transfer
Length
Minim um
Pre-fetch
This field indicates the num ber of sectors that are to be pre-fetched. See
also MF.
0
Maxim um
Pre-fetch
This field indicates the m axim um am ount of data to pre-fetch into the
cache as a result of one READ com m and.
0421h
5-54
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SCSI Description
Specifies an upper lim it on the num ber of logical blocks com puted as the
m axim um pre-fetch. Ifthis num ber ofsectors is greater than the m axim um
pre-fetch, then the num ber of logical blocks to pre-fetch is reduced to the
value stored in the m axim um pre-fetch ceiling field.
Maxim um
Pre-fetch
Ceiling
0421h
FSW
LBCSS
DRA
VS
0
0
0
The Force Sequential Write bit.
The Logical Block Cache Segm ent Size bit.
The Disable Read-Ahead bit.
The Vendor-Specific bits.
Num ber of
Cache
segm ents
14h
Ignored by the drive.
Cache
0
0
Not supported by the drive.
Segm ent Size
Non-Cache
Segm ent Size
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SCSI Description
The Control Mode page controls the drive’s command processing and error handling
5-73 respectively.
Control Mode Page-(Page 0Ah)
0
1
2
3
PS
Rsvd
Page Code (0Ah)
Page Length (0Ah)
Reserved
Queue Algorithm Modifier
RAC Reserved
Reserved
GLTSD
Qerr
RLEC
DQue
Reserved
RAERP
UAAER
P
4
EECA
EAERP
5
6 – 7
8 – 9
10
Ready AEN Holdoff Period
Busy Tim eout Period
MSB
Extended Selftest Com pletion Tim e
Extended Selftest Com pletion Tim e
11
LSB
NOTES:
Bytes 8 to 11 are returned only if the device operating definition is SCSI-3.
5-56
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SCSI Description
Control Mode Page-Field Descriptions (Page 0Ah)
Param eters Savable. This bit is only used with the MODE SENSE com m and.
A returned value of 1 indicates that the target is capable of saving the page
in a non-volatile, vendor-specific location. The bit is reserved with the
MODE SELECT com m and.
PS
1
Global Logging Target Save Disable. If this bit = 1, the ability to save log
ages to disk is disabled. If a LOG SELECT with the SP bit is received by the
drive, the current cum ulative values will be cleared. The on-disk values will
not be changed. If a LOG SENSE with the SP bit set is received by the drive
and the GLTSD bit is set and the unit is ready, the last LOG counter values
written to disk will be returned (not the current cum ulative values).
GLTSD
RLEC
0
If a STOP UNIT com m and or a LOG SENSE com m and with the SP bit set is
issued to the drive, the cum ulative values of the Log Counters page will be
written to disk. A LOG SENSE com m and will return the cum ulative values
since the counters were cleared, not since the drive was powered on.
Report Log Exception Condition. The drive does not report log exception
conditions.
0
This field specifies restrictions on the algorithm used for re-ordering com -
m ands that are tagged with the SIMPLE m essage.
A value of 0 specifies that the drive orders the actual execution sequence
with a SIMPLE statem ent.
Queue
Algorithm
Modifier
0001b
A value of 1 (Unrestricted Re-ordering Allowed) specifies that the drive can
re-order the actual execution sequence of the com m ands with a SIMPLE in
any m anner. Any data integrity exposures related to com m and sequence or-
der are explicitly handled by the initiator through the selection ofappropriate
com m ands and queue tag m essages.
Queue Error Managem ent. This field controls the drive’s processing of
queued com m ands when a Contingent Allegiance (CA) condition or Extend-
ed Contingent Allegiance (ECA)is cleared. Processing of queued com m ands
is resum ed when a CA/ECA condition is cleared.
QErr
0
0
Disable Queue. When set to the default value of 0, the drive supports
tagged com m and queuing.
When the Disable Queue bit is set to 1, tagged com m and queuing is dis-
abled. A subsequent tagged m essage from the initiator is rejected with a
MESSAGE REJ ECT m essage and the I/O process is executed as an un-
tagged com m and.
DQue
EECA
RAC
0
0
0
0
0
AEN enabled.
Report A Check Condition bit.
Ready AER Perm ission.
Unit Attention AER Perm ission.
Error AER Perm ission.
RAERP
UAAERP
EAERP
Ready AER
Holdoff
0
Not supported by the drive.
Not supported by the drive.
Period
Busy Tim e-
out Period
FFFFh
NOTES:
If the Queue Algorithm Modifier specifies restricted re-ordering (0000b), commands
are not allowed to execute concurrently. If this field specifies unrestricted re-ordering
(0001b), concurrent I/ O execution is allowed.
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SCSI Description
The Notch and Partition page contains parameters for drives that implement a variable
number of sectors per cylinder, and, support this page. Each section of the logical unit
with a different number of sectors is referred to as a notch (or band). Each notch must
span a set of consecutive logical blocks in the logical unit, the notches must not
overlay, and no logical blocks can be excluded from the notches. The data format and
Notch and Partition Page-(Page 0Ch)
0
1
PS
Rsvd
LPN
Page Code (0Ch)
Page Length (16h)
Reserved
2
ND
3
Reserved
4 – 5
6 – 7
8 – 11
12 – 15
16 – 23
Maxim um Num ber of Notches
Active Notch
Starting Boundary
Ending Boundary
Pages Notched
5-58
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SCSI Description
Notch and Partition Page-Field Descriptions (Page 0Ch)
Param eters Savable. This bit is only used with the MODE SENSE com -
m and. The returned value of 0 indicates that the target is not capable
of saving this page in a non-volatile vendor specific location This bit is
reserved with the MODE SELECT com m and.
PS
0
1
Notched (banded) Drive. A value of 0 indicates that the drive is not
notched and that all other param eters in this page are returned as 0.
ND
The default value of 1 indicates that the device is notched. For each
supported active notch value, this page defines the starting and ending
boundaries of the notch.
Logical or Physical Notch. The default value of 0 indicates that the
boundaries of the notch are based on the physical param eters of the
logical unit. The cylinder is considered m ost significant and the head
least significant.
LPN
0
A value of 1 indicates that the notch boundaries are based on logical
blocks of the logical unit.
This field indicates the m axim um num ber of notches supported by the
logical unit. The value cannot be changed.
MaxNotch
24
0
The Active Notch field indicates the notch referenced by this, and sub-
sequent MODE SELECT and MODE SENSE com m ands. The value in
this field can be changed by a later MODE SELECT com m and. The val-
ue of the active notch m ust be = 0 and = 24. An active notch of 0
indicates that this and subsequent MODE SELECT and MODE SENSE
com m ands refer to the param eters that apply across all notches.
Active
Notch
This field indicates the beginning of the active notch or, if the active
notch is 0, the beginning boundary of the logical unit. If the LPN value
is 1, the starting boundary is a Logical Block Address.
Starting
Boundary
000000h,00h
If the LPN value is 0, the three m ost significant bytes designate the
starting cylinder num ber and the least significant byte is the starting
head num ber. This field is unchangeable. When used with the MODE
SELECT com m and, this field is ignored.
18GB:
792D01H
792DH = 31021 which refers to the ending cylinder, 01H is the end-
ing head num ber
Ending
Boundary
36GB:
792D03H
792DH = 31021 which refers to the ending cylinder, 03H is the end-
ing head num ber
73GB:
792D07H
792DH = 31021 which refers to the ending cylinder, 07H is the end-
ing head num ber
This is a 64-bit bitm ap that indicates which MODE com m and pages
contain param eters that m ay be different for different notches. The
m ost significant bit (MSB) corresponds to Page 3Fh (Vendor-Unique
Caching Page), and the least significant bit (LSB) corresponds to Page
00h
00000000b,
00000000b,
00000000b,
00000000b,
00000000b,
00000000b,
00010000b,
00001000b
Pages
Notched
(Unit Attention Control Page).
If a bit is 1, the corresponding m ode page contains param eters that
m ay be different for different notches.
If a bit is 0, the corresponding m ode page contains param eters that are
constant for all notches.
The value of 1 in bits 3 and 12 indicates that Page 03h and 0Ch contain
different param eters for different notches.
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SCSI Description
that affect SPI SCSI device port operation options. The page will be implemented by
LUN 0 of all SPI SCSI devices. The page will not be implemented by logical units
other than LUN 0. The implementation of any bit and its associated functions is
optional. The page follows the MODE SENSE/ MODE SELECT rules specified by
SCSI Primary Commands-2 standard.
The target will maintain an independent set of port control mode page parameters for
each initiator. The parameters saveable bit in the mode page format header returned
with MODE SENSE command will be set to zero if the long mode page format is
being used (LONG bit set to one), indicating the parameters are not saved through
resets.
Port Control Page Short Format
0
1
2
3
4
5
6
7
PS
LONG(0)
Page Code (19h)
Page Length (06h)
Reserved
Reserved
Protocol Identifier (1h)
Synchronous Transfer Tim eout
Synchronous Transfer Tim eout
MSB
LSB
Reserved
Reserved
The Protocol Identifier field of 1h indicates the protocol that this mode page applies
to a SPI SCSI device. See the SCSI Primary Commands-2 standard for other port
control page protocol identifiers.
The Synchronous Transfer Timeout field indicates the maximum amount of time in
1 millisecond increments that the target will wait before generating an error by doing
an unexpected bus free. The target will only go to a BUS FR EE phase if one of the
following events causes the timer, once started, to not reset or reload before expiring:
• If there is a R EQ transition when there are no outstanding R EQs
waiting for an ACK then load and start the timer.
• If there is a R EQ transition when there are any outstanding REQs
waiting for an ACK then there is no effect on the timer.
• If there is an ACK transition when there are outstanding R EQs waiting
for an ACK then load and start the timer.
• If after an ACK transition there are no outstanding R EQs waiting for
an ACK then stop the timer.
• A SYNCHRONOUS TR ANSFER TIMEOUT field value of 0000h
indicates that the function is disabled. A value of FFFFh indicates an
unlimited period.
5-60
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SCSI Description
Port Control Page Long Format
0
1
2
3
4
5
6
n
PS
LONG (1)
Page Code (19h)
Subpage Code
Page Length (n-3)
MSB
Page Length (n-3)
Reserved
LSB
Reserved
Protocol Identifier (1h)
Protocol Specific Mode Param eters
The Subpage Code field indicates which subpage is being accessed. Subpage Code
a CHECK CONDITION status. The sense key will be set to ILLEGAL R EQUEST
and the additional sense code set to ILLEGAL FIELD IN PAR AMETER LIST.
The Page Length field specifies the length in bytes of the subpage protocol specific
mode page parameters after the Page Length field.
The Protocol Identifier field of 1h indicates the protocol that this mode page applies
to a SPI SCSI device. See the SCSI Primary Commands-2 standard for other port
control page protocol identifiers.
The Port Control Subpages can be found on page 5-75.
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SCSI Description
The Power Condition Page controls disk drive Power Management functions. Power
Management provides three sub-states of UNIT R EADY:
• ACTIVE: This is the state of highest power consumption for the disk
drive. A media access command is acted upon immediately by the drive.
• IDLE: This is a state of lower power consumption for the disk drive. A
media access command is acted upon after a delay of approximately one
second.
• STANDBY: This is the state of lowest power consumption for the disk
drive. A media access command is delayed by approximately 10 seconds
before being acted upon.
Note that in all three sub-states, the drive remains R EADY.
Power Condition Page fields.
Power Condition Page-(Page 1Ah)
0
1
2
3
PS
Page Code (1Ah)
Page Length (0Ah)
Reserved
Reserved
IdlEnb
Sby-
Enb
4 - 7
Idle Tim er
8 - 11
Standby Tim er
5-62
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SCSI Description
Power Condition Page-Field Descriptions (Page 1Ah)
Param eters Savable. This bit is only used with the MODE SENSE com -
m and. A returned value of 1 indicates that the target is capable of saving
the page in a non-volatile, vendor-specific location. The bit is reserved
with the MODE SELECT com m and.
PS
0
Enable Idle Tim er. This is a lower power consum ption state of the drive.
A m edia access com m and waits for an approxim ately one second transi-
tion tim e delay from the IDLE to the ACTIVE state.
IdlEnb
0
0
Enable Standby Tim er. Any m edia access com m and waits for an approxi-
m ately 10 second transition tim e delay from the STANDBY to the ACTIVE
state.
SbyEnb
The Idle Tim er specifies the tim e, in 100-m illisecond increm ents, before
entering the IDLE state after the last m edia access com m and. The IdlEnb
field m ust be set to 1. The internal m inim um value for this field is 60 sec-
onds.
Idle Tim er
0
0
The Standby Tim er specifies the tim e, in 100-m illisecond increm ents, be-
fore entering the Standby state after the last m edia access com m and. The
SbyEnb field m ust be set to 1. The internal m inim um value for this field is
15 m inutes.
Standby
Tim er
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SCSI Description
This page defines the methods used by the disk drive to control the reporting and
operations of specific informational exception conditions. This page applies only to
informational exceptions that report an additional sense code of FAILUR E
PR EDICTION THR ESHOLD EXCEEDED to the application client.
Informational exception conditions occur as the result of vendor-specific events
within a disk drive. An informational exception condition may occur asynchronous to
any commands issued by an application client.
Information Exceptions Control Page-(Page 1Ch)
0
1
2
3
PS
Perf
Page Code (1Ch)
Page Length (0Ah)
EWASC DExcpt
Reserved
Reserved
Test
Rsv’d
MRIE
LogErr
(MSB)
4 - 7
Interval Tim er
(LSB)
(LSB)
(MSB)
8 – 11
Report Count
5-64
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SCSI Description
Information Exceptions Control Page-Field Descriptions (Page 1Ch)
Param eters Savable. This bit is only used with the MODE SENSE com m and.
A returned value of 1 indicates that the target is capable of saving the page
in a non-volatile, vendor-specific location. This bit is reserved with the
MODE SELECT com m and.
PS
1
1
Perform ance.This bitenables/disables perform ance-sensitive functions.For
Atlas 10K III, this m eans enabling or disabling flushing of SMART data to
the m edia (done hourly). The prediction algorithm is designed to reset the
current accum ulated data approxim ately every 100,000 blocks read or writ-
ten per head.
PERF
When this bit = 0, current accum ulated SMART data is preserved across
power cycles.
When this bit = 1, current accum ulated SMART data is lost across power
cycles.
Enable Warning ASC. When this bit = 0, reporting of therm al warm ing is
disabled.
EWASC
DExcpt
1
0
When this bit = 1, therm al warning reports are enabled.
Disable Exceptions. This bit is used to enable or disable SMART exception
reporting. When this bit = 0, SMART exception reporting is enabled.
When this bit = 1, all SMART functions are disabled, including reporting
SMART exceptions, running the prediction algorithm , and accum ulating
SMART data.
When this bit = 0, the test function is disabled.
When this bit = 1, the disk drive reports false SMART trip reports as pre-
scribed in the MRIE field (see below). Interval tim er field and report count
and m ethod fields apply. When the test bit forces a SMART failure, the fail-
ure is reported with a sense code/qualifier of 5D/FF.
Test
0
When this bit = 0, it indicates that log sense inform ation is vendor-unique.
NOTE: LogErr = 0 is the only value supported.
LogErr
MRIE
0
4
Method ofReporting Inform ationalExceptions. The value within this field in-
dicates the m ethod that will be used by the diskdrive to report inform ational
ing of m ultiple inform ational exceptions is vendor-specific.
This field indicates the period, in 100 m illisecond increm ents, for reporting
that an inform ational exception condition has occurred. The disk drive will
not report such conditions m ore frequently than the tim e specified by the
Interval Tim er field and as soon as possible after the tim er interval has
elapsed. After the condition has been reported, the interval tim er restarts.
A value of 0 in the Interval Tim er field indicates that the disk drive will only
report the inform ational exception condition once. A value of FFFFFFFFh in
the Interval Tim er field indicates that the tim er interval is vendor-specific.
If the disk drive’s predictor detects a SMART threshold trip, it reports the
failure only if it has not reported a failure within the last interval tim er peri-
od. A value of 0 m eans that there is no required waiting between SMART
reports.
Interval
Tim er
0
NOTE: The Interval Tim er field does not apply to MRIE m ode 6.
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SCSI Description
The value contained in this field indicates the num ber of tim es to report an
inform ational exception condition to the application client. A value of 0 in
this field indicates there is no lim it on the num ber of tim es the disk drive will
report an inform ational exception condition.
Each tim e the disk drive detects a SMART failure, the SMART status is re-
ported the num ber of tim es indicated by the value of the Report Count field.
Report
Count
1
The disk drive then resets its cum ulative values and continues with its pre-
dicting activity. The SMART threshold trip rem ains perm anent (or until a
LOG SELECT com m and clears it) and can be retrieved at any tim e using
MRIE m ode 6.
NOTE: The Report Count field does not apply to MRIE m ode 6.
Codes Used by the MRIE Field
No reporting of inform ational exception condition. This m ethod instructs the disk drive not
to report these conditions.
0h
1h
Asynchronous Event Reporting. This m ethod of reporting instructs the disk drive to report
inform ational exception conditions by using the rules for asynchronous event reporting as
described in the SCSI-3 Architecture Model and the relevant Protocol Standard. The sense
key will be set to RECOVERED ERROR and the additional sense code will indicate the cause
of the inform ational exception condition.
Generate Unit Attention. This m ethod of reporting instructs the disk drive to report infor-
m ational exception conditions by returning a CHECK CONDITION status on any com m and.
2h
3h
The sense key is set to UNIT ATTENTION and the additional sense code will indicate the
cause of the inform ation exception condition. The com m and that has the CHECK CONDI-
TION will not be executed before the inform ational exception condition is reported.
Conditionally Generate Recovered Error. This m ethod of reporting instructs the diskdrive to
report inform ational exception conditions dependent on the value of the PERbit of the Error
Recovery Param eters Mode Page, by returning a CHECK CONDITION status on any com -
m and. The sense key will be set to RECOVERED ERROR and the additional sense code will
indicate the cause of the inform ational exception condition. The com m and that has the
CHECKCONDITION will com plete before and inform ational exception condition is reported.
Unconditionally Generate Recovered Error. This m ethod ofreporting instructs the diskdrive
to report inform ational exception conditions regardless of the value of the PER bit of the
Error Recovery Param eters Mode Page, by returning a CHECK CONDITION status on any
com m and. The sense key will be set to RECOVERED ERROR and the additional sense code
will indicate the cause of the inform ational exception condition. The com m and that has the
CHECK CONDITION will com plete without error before any inform ational exception condi-
tion will be reported.
4h
Generate No Sense. This m ethod of reporting instructs the diskdrive to report inform ational
exception conditions by returning a CHECK CONDITION status on any com m and. The sense
key will be set to NO SENSE and the additional sense code will indicate the cause of the
inform ationalexception condition. The com m and that has the CHECK CONDITION willcom -
plete without error before any inform ational exception condition is reported.
5h
6h
Only Report Inform ational Exception Condition On Request. This m ethod of reporting in-
structs the disk drive to preserve the inform ational exception(s) data. To learn about these
exception conditions, the application client polls the disk drive via an unsolicited REQUEST
SENSE com m and. The sense key is set to NO SENSE and the additional sense code will
indicate the cause of the inform ational exception condition.
7h – Bh
Reserved.
Ch – Fh
Vendor-specific.
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SCSI Description
This Maxtor-unique page is implemented for historical purposes only. All unused
fields are changeable but are ignored by the drive. The data format and field
Maxtor-Unique Page-Data Format (Page 39h)
0
1
PS
Rsv’d
Page Code (39h)
Page Length (14h)
Wait
SpinUp
Enable
Enable
Error
Logging
Disable
Parity
Check
Reall.
Uncor.
Errors
Enable
Fill Data
Pattern
Disable
Unit
Att’n
2
Disable
SCAM
Reserved
Disable
Auto
Disable
Auto
3
4
5
Delay
Spin
SSSIE
Software Selectable SCSI ID
WRITE
READ
Reselection Retries
Auto
Master
Enable
Stagger
Spin
ERSS
Force 8
DFCP
PXM
ISN
IWN
(MSB)
6 - 7
8
Stagger Spin Delay
(LSB)
Enable
Quiet
NMAIO
P
ASDP
Rsv’d
USCIO
FAxRE
SAE
DRC
Rsv’d
Read
Ahead
Disable
9
Soft
Fault
ManCal
DPER
QDER
FCHG
DFC
Disable
Revec-
tor
AIP
Check
En-
AIP
Gen
10
DFRC-
SU
AIP
EDAF
ESL
ESPDis
LogPgB
Disabled
Capable
Cache
abled
Disable
Auto
Move
Heads
Enable
Com m
Tim eout
11
Force
10
IMR
IOE
DlyESP
DEWG
SSSO
12
13 - 14
15
MaxSkip
Vendor Specific
Minim um Block Threshold
Maxim um Slots to be Reserved
Spindle Synch Check Interval
16
EAMNR
17
18
RUEEW
20
Com m and Tim eout Lim it
21
Com m and Tim eout Lim it Response Tim e
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SCSI Description
Maxtor-Unique Page-Field Descriptions (Page 39h)
Param eters Savable. This bit is only used with the MODE SENSE com m and.
A returned value of 1 indicates that the disk drive is capable of saving the
page in a non-volatile, vendor-specific location. The bit is RESERVED with
a MODE SELECT com m and.
PS
1
WaitSpinUp
Enable
When this field = 0, the disk drive spins up upon power on. When this field
= 1, the disk drive perform s a Wait/Spin.
0
0
0
Enable Error
Logging
When this field = 0, Error Logging is disabled.
When this field = 1, Error Logging is enabled.
Disable
Parity Check
When this field = 0, Parity Checking is enabled.
When this field = 1, Parity Checking is disabled.
When this field = 0, reallocation of blocks that have uncorrectable read er-
rors does not take place
When this field = 1, a block that encounters an uncorrectable read error will
be m arked for pending reallocation. The block in error rem ains “as is” for a
possible recovery on a future access. If a subsequent successful read or
write (with readback / com pare) occur, the pending reallocation will be de-
ferred. However, it will be “rem em bered” that an unrecoverable read oc-
curred at one tim e, and if a second unrecoverable read occurs, the block will
be reallocated on the next successful access. Also, if a subsequent unsuc-
cessful write occurs on a block m arked for pending reallocation, the block
will be reallocated.
Realloca-
tion Uncor-
rected
0
Errors
When this field = 0, the disk drive ignores any inform ation in Byte 2 of the
FORMAT UNIT com m and. Note that if the setting in Byte 2 of FORMAT
UNIT is “0”, the disk drive will interpret that setting as “1.”
Enable Fill
Data Pattern
1
When this field = 1, the disk drive writes the data pattern that is specified
in Byte 2 of the FORMAT UNIT com m and into every user-accessible block
when the disk drive executes a FORMAT UNIT com m and.
Disable
SCAM
1
When this field = 0, SCAM is enabled. When this field = 1, SCAM features
are disabled.
(Parallel)
When this field = 0, a UNIT ATTENTION condition exists following power
on or a reset caused by either a BUS DEVICE RESET m essage or a hard reset
condition.
Disable Unit
0
Att’n
When this field = 1, the disk drive will not issue a CHECK CONDITION sta-
tus with the UNIT ATTENTION sense key on the first com m and following a
reset. The disk drive will execute the first com m and issued after a reset con-
dition.
Software Selectable SCSI ID Enable. When this field = 0, the disk drive’s
SCSI ID is determ ined via the disk drive’s hardware ID select jum per set-
tings.
When this field = 1, the disk drive’s SCSI ID setting is determ ined by the
value set in the Software Selectable SCSI ID field (Byte 3, bits 0 – 3).
SSSIE
0
Disable
When this field = 0, the Auto WRITE function is enabled.
When this field = 1, the Auto WRITE function is disabled.
0
0
Auto WRITE
Disable
Auto READ
When this field = 0, the Auto WRITE function is enabled.
When this field = 1, the Auto WRITE function is disabled.
When this field = 0, Delay Spin is not enabled.
When this field = 1, and Staggered Spin Delay (Bytes 6 & 7) is enabled, the
three lower bits of the disk drive’s SCSI ID are used for the m ultiplier to de-
term ine the length of the delay. When only three bits are used, disk drives
0 through 7 and drives 8 through 15 have the sam e corresponding delays
since the fourth bit is not used (disk drive 0 has the sam e delay as disk drive
8, disk drive 1 has the sam e delay as disk drive 9, and so on).
Use Three
Bits for
Delay
0
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SCSI Description
When SSSIE (Byte 3, bit 7) = 1, this field determ ines the disk drive’s SCSI
ID. When changing SCSI ID via the MODE SELECT com m and, the SCSI ID
changes after the next reset or power cycle. If at initial power on the SSSIE
bit is set to 1 (the bit’s previous setting was saved to disk) the Software
Selectable SCSI ID field’s value determ ines the disk drive’s SCSI ID.
Software
Selectable
SCSI ID
0
7
The value of this field specifies the num ber of reselection attem pts the drive
will m ake to the initiator. A value of 0 indicates an infinite num ber of rese-
lection attem pts.
Reselection
Retries
Enable Rotational Position Locking (RPL) Sector Synchronization.
ERSS
0
0
Stagger
Spin
When the value of this field =1, the Stagger Spin Delay field (Bytes 6 & 7)
is in effect. The disk drive operates as if its Spin Delay jum per was installed.
When this field = 0, this disk drive does not act as the m aster in a storage
array configuration (refer to the Hard Disk Geom etry page). When this field
= 1, this disk drive becom es the m aster.
Auto Master
Enable
0
When this field = 0, 16-bit wide data transfer responses are allowed.
When this field = 1, negotiations are lim ited to 8-bit responses.
Force 8
DFCP
0
0
Delay Following Com m and Phase.
Preserve Synchronous and Wide Mode. If set = 1, this bit causes the disk
drive to preserve the m ost recent wide and synchronous states for all initi-
ators across power on resets, bus reset, and bus device reset m essages.
PXM
0
Initiate Synchronous Negotiation. When this field is set = 1, the disk drive
initiates a synchronous transfer negotiation with the initiator. This is done
on the first selection with ATTENTION following a power on reset, bus re-
set, or bus device reset. The negotiation is done for each initiator. Note that
if both ISN and IWN (Byte 5, bit 0) are set =1, the wide data transfer ne-
gotiation takes place first.
ISN
0
Initiate Wide Negotiation. When this field is set = 1, the disk drive initiates
a wide data transfer negotiation with the initiator. This is done on the first
selection with ATTENTION following a power on reset, bus reset, or bus de-
vice reset. The negotiation is done for each initiator. Note that if the disk
drive is not capable of actually transferring data on a wide bus, the firm ware
will only negotiate for an 8-bit bus. If both ISN (Byte 5, bit 1) and IWN are
set =1, the wide data transfer negotiation takes place first. A wide data
transfer negotiation causes the disk drive to reset any synchronous agree-
m ent to asynchronous m ode.
IWN
0
The Stagger Spin Delay is a value in 100 m illisecond units that is used to
determ ine the length of the period of tim e delay before starting the disk
drive’s m otor if the Stagger Spin feature is used. The actual am ount of the
delay is determ ined using the following form ula:
Stagger
Spin Delay
28h
Spin Up Delay = (SCSI ID x Stagger Spin Delay).
Refer to the description of Delay Spin (Byte 3, bit 4).
Note that for the value in Stagger Spin Delay field to have effect, the Spin
Delay hardware jum per m ust be installed (Chapter 3).
Always Save Data Pointers. If set = 1, the drive will always send an SDP
m essage before sending a DISCONNECT m essage.
ASDP
EnableQuiet
USCIO
0
0
0
0
Enable Quiet Seek Mode. If set = 1, Quiet Seek m ode is enabled.
Use Sam e Cylinder Optim ization in OPTWORK. When set = 1, helps m ulti-
ple sequential stream s.
SAE
Show All Errors. When this field = 1, errors usually hidden are shown.
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SCSI Description
Disable Reassign Copy. When this field = 0, the disk drive copies best-
guess data to the new physical block during REASSIGN BLOCKS com m and
processing. If the disk drive cannot successfully read the original block’s da-
ta, the disk drive sets a Forced Error flag in the replacem ent block’s flags.
DRC
0
When this field = 1, the disk drive does not copy a block’s data and obtain
best-guess data; it first reassigns the block and then writes data to the
block. Untilit is overwritten by a subsequent WRITEcom m and, a reassigned
block’s data is undefined and its Forced Error flag is set.
NMAIOP
DNTRA
0
0
0
No MAIOP. When this field = 1, MAIOP is disabled.
Disable Next Track Read Ahead. Do not prefetch next track.
When this field is set = 1, the disk drive’s FAULT led illum inates.
Soft Fault
Manual Calibration. When set = 0, the disk drive runs calibration and diag-
nostic procedures periodically.
When set = 1, calibrations occur only as a result of a REZERO UNIT com -
m and.
ManCal
0
Note that this bit is not saved by MODE SELECT when the value of the SP
field is 1.
Disable Post Error Recovery. When set = 1, disables Post Error Recovery
(refer to Read-Write Error Recovery Page, Section 5.17.3.3).
DPER
1
1
Force AxRE where x = W (WRITE) or R (READ)
When set = 0, the settings of AWRE/ARRE are as set in Mode Page 01h
(Read-Write Error Recovery Page).
FAxRE
When set = 1, Autom atic WRITEs or READs are forced, even if the related
fields of Mode Page 01h are = 0.
Quick Disk Error Recovery. When set = 0, disk error recovery has no
20m sec lim it.
QDER
DFC
0
When set = 1, disk error recovery tim e allotted is less than 20m sec.
Disable Form at Certification. If set = 1, form at certification is disabled re-
gardless of the value of the DCRT bit in the FORMAT Com m and’s param eter
header.
0
0
0
Read Ahead
Disable
If set = 1, disables READ ahead.
Enable
Double Ack
Filter
If set = 1, enables the double acknowledge filter.
ESPDis
0
0
ESP Disabled. If this field = 1, ESP (anticipatory READ) is disabled.
Disable Filling of Revector Cache on Spin-Up. When this field = 1, revec-
toring cache is not refilled on spin-up.
DFRCSU
Asynchronous Inform ation Protection (AIP) Generation Disabled. When =
0, drive places AIP inform ation on the upper byte of data during asynchro-
nous inform ation phases, regardless of the setting of “AIP Check Enabled.”
When set = 1, AIP generation is disabled.
AIP Gen
Disable
0
AIP Checking Enabled. When = 0, the drive will ignore AIP inform ation for
this initiator. When = 1, the drive is able to validate incom ing AIP inform a-
tion on upper byte of data during asynchronous inform ation phases and can
generate errors on bad inform ation.
AIP Check
Enabled
0
NOTE
This bit is m aintained uniquely for each unique initiator ID that senses or se-
lects it. All initiators that want to participate in AIP m ust set this bit for
them selves.
When = 0, indicates that drive does not support AIP. If = 1, indicates drive
is capable of AIP.
AIP Capable
LogPgB
1
0
When this field = 0, “total bytes read/written” field on Log Page 02h and
03h reported as num ber of
.
. When = 1, field is reported as num ber of
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SCSI Description
Disable
Auto Move
Heads
When set to a 0, Move heads is on m eaning that if there is no I/O activity
for 30 seconds the heads will m ove on there own. When set to a 1 Move
heads will be turned off.
0
Enable Save Log. When set = 1, saving and loading of non-SMART pages
to/from the MCS area is enabled.
ESL
IMR
0
0
Infinite Message Retry. When set = 1, the num ber of retries at a m essage
error is infinite.
IOE
1
0
Individual ORCA Profile Enabled. When set = 0, this feature is disabled.
Arcs always on.
ArcsOn
Delay ESP. For ESP (anticipatory-READ) com m ands only, when set = 1 the
delay from data phase to the first REQ of data is increased from about 2 µs
to about 16 µs.
DlyESP
0
When this bit = 0, the disk drive m ay negotiate for a transfer period less
than 19h.
Force10
DEWG
0
When this bit = 1, SDTR transfer period is lim ited to 19h m inim um .
Disable ESP WRITE Guess. When = 1, enables this feature.
1
0
Enable
Com m
Tim eout
Enable Com m and Tim eout. When = 1, enables this feature.
The value of this field specifies the num ber of tim es that a host request can
be skipped over (such as when perform ing queuing optim izations). This pa-
ram eter affects only queued com m ands. Som e host operating system s sup-
port tagged com m and queuing which allows for m ultiple requests to be
resident in the disk drive sim ultaneously. The disk drive can then re-order
execution of the requests to im prove throughput. For system s in which m in-
im um com pletion tim e ofa request is m ore im portant than throughput, Max-
Skip can be reduced. Values allowed range from 0 to 255.
MaxSkip
5
Vendor Spe-
cific
---
1
Proprietary Inform ation
Minim um
Block
Threshold
This field specifies the m inim um num ber ofblocks ready before starting data
transfer.
This field is used to reserve x am ount of slots from the total resources with-
in the disk drive for incom ing com m ands. Once the rem aining slots are full,
up to the queue depth of the disk drive, subsequent com m ands will be ac-
cepted but placed on a disk drive internal pending list. As the disk drive
com pletes the active com m ands, freeing up internal resources (SMBs), the
pending com m ands are activated.
Maxim um
Slots to be
Reserved
0
Spindle Sync Sector Offset. This field is used to specify the RPL offset to
sector boundary.
SSSO
0
0
Enable Auto Master Negotiation if RPL Mode = 0.
EAMNR
The value of this field specifies the tim e, in m inutes, of the interval between
spindle synchronization status checks. If this value is 0, the spindle is
checked at five-m inute intervals. If the value is set to 60 or greater, the spin-
dle is checked at 60-m inute intervals.
Spindle
Sync Check
Interval
0
Com m and
Tim eout
Lim it
The value of this field specifies the tim eout lim it in 100 m illisecond units.
The default value of 60 specifies a com m and tim eout lim it of 6 seconds
60
10
Com m and
Tim eout
Lim it
Response
Tim e
The value of this field specifies how long, in 100 m illisecond units, before
the Com m and Tim eout Lim it abort processing should com m ence. This is in-
tended to com pensate for abort processing tim e.
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SCSI Description
To start AIP:
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SCSI Description
The MODE SELECT (10) command allows the initiator to modify certain mode
pages and thereby control some of the drive’s operational characteristics. R efer to
of the MODE SELECT (10) Command Descriptor Block. See MODE SELECT (6),
descriptions.
MODE SELECT (10) Command Descriptor Block-Data Format
0
Operation Code (55h)
PF
1
Reserved
Reserved
SP
2 - 6
7 - 8
9
Reserved
Param eter List Length
Control
Mode Parameter Header (10-Byte)-Data Format
(MSB)
(MSB)
0 - 1
Mode Data Length
(LSB)
(LSB)
2
3
Medium Type
Device-Specific Param eter
Reserved
4 - 5
6 - 7
Block Descriptor Length
Mode Parameter Block Descriptor-Data Format
(MSB)
(MSB)
0 - 3
4
Num ber of Blocks
Density Code
(LSB)
(LSB)
5 - 7
Block Length
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SCSI Description
Mode Parameter Block Descriptor-Field Descriptions
The value in this field specifies the num ber of logical blocks on the disk to
which the density code and block length fields apply. A value of 0 in this
field indicates that all of the rem aining logical blocks on the disk have the
m edium characteristics specified.
Num ber of
Blocks
The Density Code field is unique for each device type. Direct access devices
value is zero.
Density Code
Block Length
The value in this field specifies the length in bytes of each logical block de-
scribed by the block descriptor.
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SCSI Description
The MODE SENSE (6) command allows the initiator to read the drive's sector
descriptor and mode pages. The MODE SENSE Command Descriptor Sector is
MODE SENSE (6) Command Descriptor Block-Data Format
0
Operation Code (1Ah)
DBD
1
2
3
4
5
Reserved
Reserved
PC
Page Code
Sub Page Code
Allocation Length
Control
MODE SENSE Command-Field Descriptions
Disable Block Descriptor. When the value is 0, the drive returns its Block
Descriptor followed by the requested page(s). When the value is 1, the drive
returns only the requested pages.
DBD
Page Control. Determ ines which type of page values are returned. These
values are:
PC
00b Current
01b Changeable
10b Default
11b Saved
The Page Code field determ ines the pages to be returned to the initiator in
for a com plete list of the Mode Pages (changeable and read-only). A Page
Code of 3Fh causes all supported pages to be returned.
Page Code
Mode Parameter Header (6 Byte)-Data Format
0
1
2
3
Mode Data Length
Medium Type
Device-Specific Param eter
Block Descriptor Length
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SCSI Description
Mode Parameter Header-Field Descriptions
Mode Data Length
Length of the returned data
Medium Type
Always zero (0)
Device-Specific
Bit 7 - This bit is set if the drive is write protected
Bit 4 - This bit is always set to indicate that the drive supports
cache m em ory.
Param eter
Zero (0) if Block Descriptor (DBD) in MODE SENSE Com m and De-
scriptor Length sector is 0.
Block Descriptor
If DBD is 1, then the Block Descriptor Length is eight (8).
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SCSI Description
Read-Only Mode Pages
03h
04h
Form at Device
Medium form at
24
24
Total cylinder head
and rotational speed
Rigid Disk Geom etry
38h
Vendor Unique Caching
Margin Control
Total segm ents
16
22
19h(1h)
Margin controlvalues
Saved Training
Configuration
Saved training
19h(2h)
19h(3h)
19h(4h)
234
14
8
configuration values
Negotiated settings
for current I_T Nexus
Negotiated Settings
Report Transfer
Capabilities
Transfer capabilities
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SCSI Description
parameters are changeable.
Format Device Page-(Page 3)
0
PS
Rsvd
Page Code (03h)
Page Length (16h)
1
2 - 3
Tracks Per Zone
Alternate Sectors/Zone
Alternate Tracks/Zone
Alternate Tracks/Logical Unit
Sectors/Track
4 - 5
6 - 7
8 - 9
10 - 11
12 - 13
14 - 15
16 - 17
18 - 19
20
Data Bytes/Physical Sector
Interleave
Track Skew Factor
Cylinder Skew Factor
SSEC
HSEC
RMB
SURF
Reserved
Reserved
21 - 23
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SCSI Description
Format Device Page-Field Descriptions (Page 3)
Param eters Savable. This bit is only used with the MODE SENSE com -
m and. This bit is reserved with the MODE SELECT com m and. A PS bit
value of 1 indicates that the disk drive is capable of saving the page in
a non-volatile vendor specific location.
PS
0
The num ber of physical tracks per cylinder:
for 18 GB, for 36 GB, for 73 GB
Tracks/Zone
Alternate
Sectors/Zone
The num ber of spare locations within a notch:
for 18 GB,
for 36 GB,
for 73 GB
Alternate Tracks/
Zone
0
The drive does not have any alternate tracks.
Alternate Tracks/
Logical Unit
The num ber of tracks reserved for defect handling:
for 18 GB,
for 36 GB,
for 73 GB
The num ber of Physical Block Address sectors per track. The value de-
pends on the Notch value selected in the Notch and Partitions page.
Sectors/Track
579
Data Bytes/
512
1
This value is the current disk sector size.
The drive does not support interleave.
Physical Sector
Interleave
The num ber of physical sectors between the last logical sector on one
track and the first logical sector on the next track within a cylinder:
25 for 18 GB, 25 for 36 GB, 25 for 73 GB
Track Skew
Factor
The num ber of physical sectors between the last logical sector on one
cylinder and the first logical sector on the next cylinder:
23 for 18 GB, 23 for 36 GB, 23 for 73 GB
Cylinder Skew
Factor
SSEC
HSEC
RMB
0
1
0
The drive does not use soft sector form atting.
The drive supports hard sector form atting only.
The drive does not support rem ovable logical m edia.
A Surface bit value of 0 indicates that the drive allocates progressive
addresses to all logical blocks within a cylinder prior to allocating ad-
dresses on the next cylinder.
SURF
0
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SCSI Description
The R igid Disk Geometry Page describes the drive geometry. The data format and
Rigid Disk Geometry Page-(Page 4)
0
1
PS
Rsvd
Page Code (04h)
Page Length (16h)
2 - 4
5
Num ber of Cylinders
Num ber of Heads
6 - 8
9 - 11
12 - 13
14 - 16
17
Starting Cylinder - Write Precom pensation
Starting Cylinder - Reduced Write Current
Drive Step Rate (0)
Landing Zone Cylinder
Reserved
RPL
18
Rotational Offset
19
Reserved
20 - 21
22 - 23
Medium Rotation Rate
Reserved
Rigid Disk Geometry Page-Field Descriptions (Page 4)
Param eters Savable. This bit is only used with the MODE SENSE
com m and. A returned value of 1 indicates that the target is ca-
pable of saving the page in a non-volatile, vendor-specific loca-
tion. The bit is reserved with the MODE SELECT com m and.
PS
1
Num ber of Cylin-
ders
17338
The num ber of physical cylinders that hold host data.
Num ber of Heads
Starting Cylinder
3/5/10/20
17338
The num ber of heads that can access host data.
The value in this field is the physical cylinder at
which write precom pensation is to begin. The first cylinder num -
ber is 0. If the starting cylinder is equal to the value in the Num ber
of Cylinders field, write precom pensation is disabled.
Write
Precom pensation
Starting Cylinder -
Reduced Write
Current
The value in this field is the physical cylinder at which write cur-
rent is reduced. The first cylinder num ber is 0. If the starting cyl-
inder for reduced write current is equalto the value in the Num ber
of Cylinders field, reduced write current is disabled.
0
0
Drive Step Rate
Applies to stepper-m otor actuators. Not applicable.
This field indicates a two’s com plem ent location where the drive
positions the disk heads. A negative value indicates that the
heads are positioned below cylinder 0 by that num ber of cylin-
ders. A positive value greater than the num ber of cylinders indi-
cates that the heads are positioned beyond the cylinders used for
data storage at the location specified.
Landing Zone
Cylinder
17338
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SCSI Description
Rotational Position Locking is used for spindle synchronization in
storage arrays. The m odes are:
00b – Disabled
10b – Master
01b – Slave
RPL
00b
11b – Not supported
RPL can be overridden if the Maxtor (Vendor) Special Function
Control page Auto field value = 1.
Rotational Offset indicates the am ount of rotational offset that
the drive uses when synchronized. The rotational offset is applied
in the retarded direction (lagging the synchronized spindle m as-
ter). The value in the field is determ ined by the following form ula:
Offset = 0 … 255
256
Rotational Offset
0
For exam ple, a num erator of 128 indicates an offset of 1/2 revo-
lution (180°).
The valid param eter values are 0 to 255.
The specified value m ay be rounded. Rotational offset is not used
when the drive is configured as the synchronized-spindle m aster.
Medium Rotation
Rate
10021
The disk rotation speed in RPM.
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SCSI Description
margin control values for usage between the initiator/ target pair on subsequent
synchronous and paced transfers.
A MODE SELECT command will return the current settings for the initiator/ target
pair. Fields that are not implemented will be reported as zero.
Margin Control Subpage (01h)
0
1
Reserved
Driver Strength
Drive’s Asym m etry
Drive’s Slew Rate
Reserved
Driver Precom pensation
Reserved
2
3
4
Reserved
Reserved
Reserved
Vendor Specific
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
5
6
7
8
9
10
11
12
13
14
15
The Driver Strength field indicates the relative amount of driver source currently used
by the driver. The Driver Strength field affects both the strong and week drivers. A
larger value indicates more driver source current.
The Driver Precompensation field indicates the relative difference between the weak
driver and the strong driver amplitudes when precompensation is enabled. A larger
value indicates a larger difference between the weak and strong amplitudes.
The Driver Asymmetry field indicates the relative difference between the amplitudes
of asserted and negated signals launched from the driver. A larger value indicates a
relatively stronger asserted signal compared to the negated signal.
The Driver Slew R ate field indicates the relative difference between the assertion and
negation magnitudes divided by the rise or fall time. A larger value indicates a faster
slew rate.
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SCSI Description
The saved training configuration values subpage is used to report the SCSI device's
saved training configuration values. These vendor specific values are maintained by the
SCSI device when the retain training information option is enabled. The fields are
for the current I_T nexus are reported.
Saved Training Configuration Subpage (02h)
0
MSB
Reserved
3
4
LSB
MSB
DB(0) Value
7
LSB
64
MSB
DB(15) Value
67
68
LSB
MSB
P_ORCA Value
LSB
71
72
MSB
P1 Value
75
76
LSB
MSB
BSY Value
79
80
LSB
MSB
SEL Value
83
84
LSB
MSB
RST Value
87
88
LSB
MSB
REQ Value
91
92
LSB
MSB
ACK Value
95
96
LSB
MSB
ATN Value
99
LSB
100
MSB
C/D Value
103
104
LSB
MSB
I/O Value
107
108
LSB
MSB
MSG Value
111
112
LSB
MSB
Reserved
227
LSB
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SCSI Description
negotiated settings of a target for the current I_T nexus.
Negotiated Settings Subpage (03h)
0
1
2
3
4
5
Transfer Period Factor
Reserved
Req/Ack Offset
Transfer Width Exponent
Reserved
Protocol Option Bits
Reserved
Transceiver
Mode
SENT_
PCOMP_EN
RECEIVED
PCOMP_EN
6
7
Reserved
Vendor Specific
The Transfer Period Factor field indicates the negotiated transfer period factor (see
current I_T nexus.
The R eq/ Ack Offset field indicates the negotiated R EQ/ ACK offset (see
current I_T nexus.
The Transfer Width Exponent field indicates the negotiated transfer width exponent
current I_T nexus.
The Protocol Options Bits field contain the negotiated protocol options (see
current I_T nexus.
The TR ANSCEIVER MODE field specifies the current bus mode of the target as
The SENT PCOMP_EN bit contains the value of the PCOMP_EN bit (see
target for the current I_T nexus.
The R ECEIVED PCOMP_EN bit contains the value of the PCOMP_EN bit (see
the target for the current I_T nexus.
Bus Mode
00b
01b
10b
11b
Unknown (device not capable of reporting bus m ode)
Single-ended
Low-Voltage Differential
High-Voltage Differential
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SCSI Description
The Maxtor-Unique Caching Page is a read-only page that reports the number of
segments in the drive's cache memory. The data format and field descriptions are
Maxtor-Unique Caching Page-(Page 38h)
0
PS
Rsv’d
Page Code (38h)
Page Length (0Eh)
1
2
Reserved
Cache Table Size
3 - 15
Reserved
Maxtor-Unique Caching-Field Description (Page 38h)
Param eters Savable. This bit is only used with the MODE SENSE com -
m and. This bit is reserved with the MODE SELECT com m and. A PS bit val-
ue of 1 indicates that the disk drive is capable of saving the page in a non-
volatile vendor specific location.
PS
0
Cache Table
Size
27
This field indicates the num ber of cache segm ents supported by the drive.
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SCSI Description
The MODE SENSE command allows the initiator to read the drive’s sector descriptor
and mode pages.
MODE SENSE (10) Command Descriptor Block-Data Format
0
Operation Code (5Ah)
1
2
Reserved
DBD
Page Code
Page Code
Reserved
PC
3
Sub
4 – 6
Reserved
(MSB)
7 – 8
Allocation Length
Control
(LSB)
9
Mode Parameter Header (10 Byte)-Data Format
(MSB)
0 - 1
Mode Data Length
(LSB)
2
Medium Type
Device-Specific Param eter
Reserved
3
4 - 5
6 - 7
Block Descriptor Length
Field Descriptions for the Mode Parameter Header are given in the table that follows.
Mode Parameter Block Descriptor-Data Format
0
Density Code
Num ber of Blocks
Reserved
(MSB)
(MSB)
1 - 3
(LSB)
(LSB)
4
5 - 7
Block Length
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SCSI Description
Mode Parameter Header & Block Descriptor-Field Descriptions
Mode Data Length
Medium Type
Reserved. Must be 0.
Ignored by the drive.
Device Specific
Param eter
Ignored by the drive.
Block Descriptor
Length
The value = 0 if no Block Descriptor is supplied; the length is 8 if a block
descriptor is supplied.
Density Code
Num ber of Blocks
Block Length
Ignored by the drive.
The value in this field specifies the num ber of logical blocks on the unit that
are affected by the current MODE SELECT com m and. When this field = 0,
the MODE SELECT param eters are put into effect for all logical blocks on
the unit. The m axim um value allowed is the total num ber of initiator-addres-
sable logical blocks for the value specified in the Block Length field. A value
that is less than the m axim um value will decrease the num ber of initiator-
accessible logical blocks to the am ount specified.
The value in this field specifies the length, in bytes, of each logical block.
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SCSI Description
The PERSISTENT RESER VATION IN command is a 10-byte command used to
obtain information about persistent reservations and reservations that are active within
a device server. It is used in conjunction with the PER SISTENT RESER VATION
OUT command.
Note that a if device that has R ESERVE (10), R ESER VE (6), extent reservations, or
SCSI Media Changer (SMC) element reservations active receives a PER SISTENT
R ESER VATION IN command, the PER SISTENT R ESER VATION IN
command is rejected with a R ESERVATION CONFLICT status reported.
PERSISTENT RESERVATION IN Command Descriptor Block-Data Format
0
Operation Code (5Eh)
Service Action
1
Reserved
2 - 6
7 – 8
9
Reserved
(MSB)
Allocation Length
(LSB)
Control
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SCSI Description
PERSISTENT RESERVATION IN Command-Field Descriptions
Service Action
Service actions that require inform ation about persistent reservation and registra-
tions m ay require enabling of nonvolatile m em ory within the logical unit.
Service action codes available are:
Code Nam e Description
00h Read Keys Reads all registered Reservation keys
01h Read Reservations Reads all current persistent reservations
02 – 1Fh Reserved
A “Read Keys” service action requests that the device server return a param eter list
that includes a header and a com plete list of all of the reservation keys currently reg-
istered with the device server. If m ultiple initiators have registered with the sam e
A “Read Reservation” service action requests that the device server return a param -
eter list that contains a header and a com plete list of all persistent reservations that
are presently active in the device server and its extents. Note that duplicate persis-
Allocation
Length
This field indicates how m uch space has been reserved for the returned param eter
list (Read Keys or Read Reservations param eters). The actual length of the param eter
data is indicated in the param eter data field for those param eters.
If the Allocation Length is not sufficient to contain the entire list of param eters, the
first portion of the list that does fit is returned. If it is determ ined that the rem ainder
of the list is required, the client should send a new PERSISTENT RESERVATION IN
com m and with an Allocation Length field large enough to contain the entire list of
param eters.
The data format and field descriptions for the Read Keys Parameters are described in
Read Keys Parameters-Data Format
(MSB)
0 - 3
4 - 7
Generation
(LSB)
(MSB)
Additional Length ( – 7)
(LSB)
(Reservation Key List Follows in Bytes 8 –
)
(MSB)
(MSB)
8 - 15
First Reservation Key
(LSB)
(LSB)
– 7 to n
Last Reservation Key
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SCSI Description
Read Keys Parameters-Field Descriptions
The value in this field is a 32-bit counter in the device server that is increm ented
each tim e a PERSISTENT RESERVATION OUT com m and requests a Register, Clear,
Pre-em pt, or Pre-em pt and Clear operation. Note that PERSISTENT RESERVATION
IN com m ands do not increm ent the counter, nor do PERSISTENT RESERVATION
OUT com m ands that perform a Reserve or Release service action, or by a PERSIS-
TENT RESERVATION OUT com m and that is not done due to an error or a reservation
conflict. The value in the Generation field is set to 0 as part of the power on or reset
processes.
Generation
The value in the Generation field allows the application client that exam ines the value
to verify that the configuration of the initiators attached to a logical unit has not been
m odified by another application client without any notification of the application cli-
ent doing the exam ination.
This field contains the count of the num ber of bytes that are in the Reservation Key
list (bytes 8 – ). Note that this field contains the num ber of bytes in the reservation
key list regardless of the value prescribed by the Allocation Length field in the com -
m and’s CDB.
Additional
Length
Each of the Reservation Keys appear as item s in a list as bytes 8 through . Each
entry reflects an 8-byte reservation key registered with the device server via the PER-
SISTENT RESERVATION OUT, Reserve, Pre-em pt, Pre-em pt and Clear, or Register
service actions. Each key can be exam ined by the application client for correlation
with a set of initiators and SCSI ports
Reservation
Keys
The data format and field descriptions for the Read R eservations Parameters are
Read Reservations Parameters-Data Format
(MSB)
0 - 3
Generation
(LSB)
(LSB)
(MSB)
(MSB)
4 - 7
Additional Length ( – 7)
8 -
Reservation Descriptors
(See Figure 5-53 / Table 5-55 for detail of a Descriptor Field)(LSB)
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SCSI Description
Read Reservations Parameters-Field Descriptions
The value in this field is a 32-bit counter in the device server that is increm ented
each tim e a PERSISTENT RESERVATION OUT com m and requests a Register, Clear,
Pre-em pt, or Pre-em pt and Clear operation. Note that PERSISTENT RESERVATION
IN com m ands do not increm ent the counter, nor do PERSISTENT RESERVATION
OUT com m ands that perform a Reserve or Release service action, or by a PERSIS-
TENT RESERVATION OUT com m and that is not done due to an error or a reservation
conflict. The value in the Generation field is set to 0 as part of the power on or reset
processes.
Generation
The value in the Generation field allows the application client that exam ines the value
to verify that the configuration of the initiators attached to a logical unit has not been
m odified by another application client without any notification of the application cli-
ent doing the exam ination.
This field contains the count of the num ber of bytes of Reservation descriptors
(bytes 8 – ). Note that this field contains the num ber of bytes regardless of the val-
ue prescribed by the Allocation Length field in the com m and’s CDB.
Additional
Length
One Reservation descriptor is reported for each unique persistent reservation on the
logical unit when the PERSISTENT RESERVATION IN com m and has indicated a Read
ervation Descriptors field.
Reservations
Descriptors
The data format and field descriptions for the PERSISTENT RESER VATION IN
respectively.
PERSISTENT RESERVATION IN Read Reservations Descriptor-Data Format
(MSB)
0 - 7
Reservation Key
Scope-Specific Address
Reserved
(LSB)
(LSB)
(MSB)
(MSB)
8 - 11
12
13
Scope
Type
14 -
15
Extent Length
(LSB)
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SCSI Description
PERSISTENT RESERVATION IN Read Reservations Descriptor-Field Descriptions
Reserva- The Reservation key field contains an 8-byte value that identifies the reservation key under
tion Key
which the persistent reservation is held.
If the Scope field (Byte 13, bits 4 – 7) represents an “Extent” reservation, the Scope-Specific
Address field contains the logical block address (LBA) of the first block of the extent and the
Extent Length field (Bytes 14 – 15) contains the num ber of blocks in the extent.
Scope-
Specific
Address
If the Scope field represents an “Elem ent” reservation, the Scope-Specific Address field con-
tains the Elem ent address, zero-filled in the m ost significant bytes to fit the field and the Ex-
tent Length field is set to zero.
The value in this field indicates whether a persistent reservation applies to an entire logical
unit, to a part of the logical unit (defined as an extent), or to an elem ent.
The values for the Scope field are:
Code Nam e Description
0h LU Logical Unit. Persistent reservation applies to the full logical unit. The LU scope is
therefore im plem ented by all device servers that im plem ent PERSISTENT RESERVATION
OUT.
1h Extent Persistent reservation applies to the specified extent. When Extent is the scope,
it indicates that the persistent reservation applies to the extent of the logical unit defined by
the Scope-Specific Address and Extent Length fields in the PERSISTENTRESERVATION OUT
com m and’s param eter list. Note that an extent is defined only for devices defining contigu-
ous logical block addresses. The Extent scope is optional for all device servers that im ple-
m ent PERSISTENT RESERVATION OUT.
Scope
2h Elem ent Persistent reservation applies to the specified elem ent. When Elem ent is the
scope, it indicates that the persistent reservation applies to the elem ent of the logical unit
defined by the Scope-Specific Address field in the PERSISTENT RESERVATION OUT param -
eter list. An elem ent is as defined by the SCSI-3 Medium Changer Com m ands (SMC) stan-
dard. The Elem ent scope is optional for all device servers that im plem ent PERSISTENT
RESERVATION OUT.
3h – Fh Reserved
The value of the Type field specifies the characteristics of the persistent reservation being
established for all data blocks within the extent or within the logical unit. Refer to Table 5-
56 for the applicable Type codes and their m eanings
Type
from the Type field of the PER SISTENT RESER VATION IN Read R eservations
parameters.
Each of the codes provides handling instructions for R EAD operations, for WR ITE
operations, and for subsequent attempts to establish persistent reservations (referred to
as “Additional R eservations Allowed” in the table).
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SCSI Description
Persistent Reservation Type Codes and Their Meanings
READS: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers from the disk to the initiator.
WRITES: Prohibited; any com m and from any initiator that perform s a
transfer from the initiator to the disk results in a reservation conflict.
0h
1h
READ Shared
ADDITIONAL RESERVATIONS: Allowed; any initiator m ay reserve the log-
ical unit, extents, or elem ents as long as the persistent reservations do not
conflict with any reservations already known to the device server.
READS: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers from the disk to the initiator.
WRITES: Exclusive; any com m and from any initiator other than the initia-
tor that holds the persistent reservation that attem pts a transfer to the
disk results in a reservation conflict
WRITE
Exclusive
ADDITIONAL RESERVATIONS: Allowed; any initiator m ay reserve the log-
ical unit, extents, or elem ents as long as the persistent reservations do not
conflict with any reservations already known to the device server.
READS:Exclusive; any com m and from any initiator other than the initiator
that holds the persistent reservation that attem pts a transfer from the disk
results in a reservation conflict
WRITES: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers to the disk from the initiator.
2h
READExclusive
ADDITIONAL RESERVATIONS: Allowed; any initiator m ay reserve the log-
ical unit, extents, or elem ents as long as the persistent reservations do not
conflict with any reservations already known to the device server.
READS:Exclusive; any com m and from any initiator other than the initiator
holding the persistent reservation that attem pts a transfer from the disk
results in a reservation conflict.
WRITES: Exclusive; any com m and from any initiator other than the initia-
tor holding the persistent reservation that attem pts a transfer to the disk
results in a reservation conflict.
Exclusive
Access
3h
ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVA-
TION OUT com m and with the Reserve service action from any initiator
other than the initiator holding the persistent reservation results in a res-
ervation conflict. The initiator that holds the persistent reservation can re-
serve the logical unit, extents, or elem ents as long as the persistent
reservations do not conflict with any reservations already known to the
device server.
READS: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers from the disk to the initiator.
WRITES: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers to the disk from the initiator.
4h
Shared Access
ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVA-
TION OUT com m and with the Reserve service action from any initiator
other than the initiator holding the persistent reservation results in a res-
ervation conflict. The initiator that holds the persistent reservation can re-
serve the logical unit, extents, or elem ents as long as the persistent
reservations do not conflict with any reservations already known to the
device server.
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SCSI Description
READS: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers from the disk to the initiator.
WRITE
WRITES: Exclusive; any com m and from an initiator that has not previously
perform ed a Register service action with the device server that attem pts
a transfer to the disk results in a reservation conflict
Exclusive,
Registrants
Only
5h
ADDITIONAL RESERVATIONS: Allowed; any initiator m ay reserve the log-
ical unit, extents, or elem ents as long as the persistent reservations to not
conflict with any reservations already known to the device server.
READS: Exclusive; any com m and from an initiator that has not previously
perform ed a Register service action with the device server that attem pts
a transfer from the disk results in a reservation conflict.
Exclusive
Access,
Registrants
Only
WRITES: Exclusive; any com m and from an initiator that has not previously
perform ed a Register service action with the device server that attem pts
a transfer to the disk results in a reservation conflict
6h
ADDITIONAL RESERVATIONS: Allowed; any initiator m ay reserve the log-
ical unit, extents, or elem ents as long as the persistent reservations to not
conflict with any reservations already known to the device server.
7h - Fh
Reserved
N/A
Being Attempted when Persistent Reservations are already held for each of the types
of persistent reservations.
When Do Conflicts Between Existing Reservations and New Reservations Exist?
Persistent
WRITE
Exclu-
sive
Exclu-
sive
Reservation
Being At-
tem pted
READ
Shared
LU EX
WRITE
Exclu-
sive
READ
Exclu-
sive
Exclu-
sive
Access
*
LU EX
Shared
Access
*
Access
RO
RO
LU EX
LU EX
LU EX
LU EX
LU EX
LU
READ Shared
EX
N N
N N
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
N N
N N
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
LU
WRITE
Exclusive
EX
LU
READ
Exclusive
EX
LU
Exclusive
Access *
EX
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SCSI Description
LU
Shared
Access *
EX
N N
N N
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
N N
N N
Y Y
O O
Y Y
Y O
Y Y
Y O
N N
N N
LU
WRITE
Exclusive
RO
N N
N N
EX
LU
Exclusive
Access RO
EX
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
N N
N N
N N
N N
KEY: LU = Logical Unit Scope
EX = Extent or Elem ent Scope
RO = Registrants Only
* = Conflicts with all reservation requests from
other initiators.
N = No Conflict
Y = Conflict
O = Conflict occurs if extent or elem ent
overlaps with existing extent or elem ent
reservation.
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SCSI Description
The PERSISTENT R ESERVATION OUT command is a 10-byte command used
to reserve a logical unit or an extent within a logical unit for the exclusive or shared
use by an initiator. The command is used in conjunction with the PER SISTENT
R ESER VATION IN command; it is not used with the RESER VE and R ELEASE
commands.
Persistent reservations conflict with reservations made via the R ESERVE command.
Initiators that perform PER SISTENT RESER VATION OUT actions are identified
by a reservation key assigned by the application client. The client may use the
PER SISTENT R ESERVATION IN command to identify which other initiators
within a system hold conflicting or invalid persistent reservations and use the
PER SISTENT R ESERVATION OUT command to preempt those reservations if
necessary.
Note that since persistent reservations are not reset by the TAR GET RESET task
management function or other global actions, they can be used to enact device sharing
among multiple initiators. The PER SISTENT R ESERVATION OUT and
PER SISTENT R ESERVATION IN commands provide the means for resolving
contentions in multiple-initiator systems with multiple port target. By using the
reservation key to identify persistent reservations, it is possible to determine which
ports hold conflicting persistent reservations and to take over such reservations from
failing or “greedy” initiators.
5-119 explains the data fields of the command.
PERSISTENT RESERVATION OUT Command Descriptor Block-Data Format
0
Operation Code (5Fh)
Service Action
Type
1
2
Reserved
Scope
3 - 6
7 – 8
9
Reserved
(MSB)
Param eter List Length (18h)
(LSB)
Control
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SCSI Description
PERSISTENT RESERVATION OUT Command-Field Descriptions
Service actions that require inform ation about persistent reservation and registrations
m ay require enabling of nonvolatile m em ory within the logical unit.
Service action codes available are:
Service Ac-
tion
Regis-
00h
01h
02h
03h
04h
Register a reservation key with the device server
Create a persistent reservation using a reservation key
Release a persistent reservation
ter
Re-
serve
Re-
lease
Clear all reservation keys and all persistent reserva-
tions
Clear
Pre-
em pt
Pre-em pt persistent reservations from another initiator
Pre-
em pt &
Clear
Pre-em pt persistent reservations from another initiator
and clear the task set for the pre-em pted initiator
05h
Re-
served
06 – 1Fh
Reserved
The value in this field indicates whether a persistent reservation applies to an entire
logical unit, to a part of the logical unit (defined as an extent), or to an elem ent.
Scope
The values for the Scope field are:
Logical Unit. Persistent reservation applies to the full
logical unit. The LU scope is therefore im plem ented by
0h
1h
LU
all device servers that im plem ent PERSISTENT RESER-
VATION OUT.
Persistent reservation applies to the specified extent.
When Extent is the scope, it indicates that the persis-
tent reservation applies to the extent of the logical unit
defined by the Scope-Specific Address and Extent
Length fields in the PERSISTENT RESERVATION OUT
com m and’s param eter list. Note that an extent is de-
fined only for devices defining contiguous logicalblock
addresses. The Extent scope is optional for all device
servers that im plem ent PERSISTENT RESERVATION
OUT.
Extent
Persistent reservation applies to the specified elem ent.
When Elem ent is the scope, it indicates that the persis-
tent reservation applies to the elem ent of the logical
unit defined by the Scope-Specific Address field in the
PERSISTENT RESERVATION OUT param eter list. An
elem ent is as defined by the SCSI-3 Medium Changer
Com m ands (SMC) standard. The Elem ent scope is op-
tional for all device servers that im plem ent PERSIS-
TENT RESERVATION OUT.
Ele-
m ent
2h
Re-
served
3h – Fh
Reserved
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SCSI Description
The value of the Type field specifies the characteristics of the persistent reservation
being established for all data blocks within the extent or within the logical unit. Refer
Type
Fields contained in the PERSISTENTRESERVATION OUTparam eter list specify the res-
ervation keys and extent inform ation required to perform a persistent reservation ser-
vice action.
Param eter
List Length
The param eter list is 24 bytes in length; the Param eter List Length field contains 24
(18h) bytes.
R ESER VATION OUT command’s seven possible service actions (Service Action
codes appear in bits 0 – 4 of Byte 1).
PERSISTENT RESERVATION OUT Command’s Service Action Descriptions
When the com m and executes a Register service action, it registers a reserva-
tion key with a device server without generating a reservation. The device serv-
er holds these reservation keys from each initiator that perform s a PERSISTENT
RESERVATION OUT com m and with a Register service action until the key is
changed by a new PERSISTENT RESERVATION OUT com m and with Register
service action from the sam e initiator, or until the initiator registration is re-
m oved by:
• Powering down the logical unit, if the last
Activate Persist Through Power Loss
(APTPL; see Figure 5-55 and Table 5-61)
received by the device server was 0;
• Performing a Clear service action;
00h
Register
• Performing a Pre-empt service action;
• Performing a Pre-empt and Clear service
action; or
• Performing a Register service action from the
same initiator with the value of the service
action reservation key set to 0.
When a reservation key has not yet been established or when the reservation
key has been rem oved, a reservation key of 0 is used when the initiator per-
form s a PERSISTENT RESERVATION OUT with the Register service action.
When the reservation has been rem oved, no inform ation is reported for the ini-
tiator in the Read Keys service action of the resulting PERSISTENT RESERVA-
TION IN com m and.
A PERSISTENT RESERVATION OUT com m and with Reserve service action cre-
ates a persistent reservation with a specified Scope and Type.
Persistent reservations are not superseded by a new persistent reservation from
any initiator except by the execution of a PERSISTENT RESERVATION OUT
com m and that specifies either a Pre-em pt or Pre-em pt and Clear service action.
New persistent reservations that do not conflict with an existing persistent res-
ervation execute norm ally. Persistent reservations of logical units or extents
having the sam e Type value are perm itted if no conflicting persistent reserva-
tions are held by another initiator. When these types of overlapping reserva-
tions are released, each of the extent reservations and logical unit reservations
are rem oved with a separate Release service action. Multiple identical reserva-
tions from the sam e initiator are all released sim ultaneously via a single Release
service action that m atches the reservations.
01h
Reserve
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SCSI Description
A PERSISTENT RESERVATION OUT com m and with Release service action re-
m oves a persistent reservation held by the sam e initiator.
The fields associated with a Release service action m atch fields of the active
persistent reservation. Sending of a PERSISTENT RESERVATION OUT com -
m and that specifies a Release service action when no persistent reservation ex-
ists from that initiator does not result in an error. Instead, the device server
returns a GOOD m essage without altering any other reservation: the reserva-
tion key is not changed by the Release service action.
The device server returns a CHECK CONDITION status for any PERSISTENT
RESERVATION OUT com m and that specifies the release of a persistent reser-
vation held by the requesting initiator that m atches som e but not all of the
Scope, Type, Reservation Key, and extent values. The sense key is set to ILLE-
GAL REQUEST and additional sense data is set to INVALID RELEASE OF AC-
TIVE PERSISTENT RESERVATION. Attem pts to release persistent reservations
in which none of the Scope, Type, Reservation Key, and extent values m atch
an existing persistent reservation held by the initiator m aking the request are
not errors.
02h
Release
An active persistent reservation m ay also be released by:
1. Powering off. When the m ost recent APTPL value received by the device
server is 0, a power-off perform s a hard reset, clears all persistent reservations,
and rem oves all registered reservation keys;
or
2. Executing a PERSISTENT RESERVATION OUT com m and from another initi-
ator with a persistent reserve service action of Pre-em pt or Pre-em pt and Clear.
Note that a Release service action should not be perform ed if any operations
interlocked by the persistent reservation have not yet com pleted.
A PERSISTENT RESERVATION OUT com m and with a successful Clear service
action rem oves all persistent reservations for all initiators. All reservation keys
are also rem oved. Any com m ands from any initiator that have been accepted
by the device server as non-conflicting continue their norm al executions.
A UNIT ATTENTION condition is established for all initiators for the cleared log-
ical unit. The sense key is set to UNIT ATTENTION; the additional sense data
is set to RESERVATIONS PREEMPTED.
03h
Clear
Note that applications should not use the Clear action service except during re-
coveries associated with initiator or system reconfiguration, since data integrity
m ay be com prom ised.
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SCSI Description
A PERSISTENT RESERVATION OUT com m and with a successful Pre-em pt ser-
vice action rem oves all persistent reservations for all initiators that have been
registered with the Service action Reservation key specified in the PERSISTENT
RESERVATION OUT com m and’s param eter list. Apersistent reservation is also
established for the pre-em pting initiator. Any com m ands from any initiator that
have been accepted by the device server as non-conflicting continue their nor-
m al executions. If a PERSISTENT RESERVATION OUT com m and is sent that
specifies a Pre-em pt service action and no persistent reservation exists for the
initiator identified by the Service action Reservation key, it is not an error con-
dition.
A UNIT ATTENTION condition is established for the pre-em pted initiators. The
sense key is set to UNIT ATTENTION; the additional sense data is set to RES-
ERVATIONS PREEMPTED. Com m ands that follow are subject to the persistent
reservation restrictions set by the pre-em pting initiator.
The persistent reservation thus created by the pre-em pting initiator is defined
by the Scope and Type fields of the PERSISTENT RESERVATION OUT com -
m and and the corresponding fields of the com m and’s param eter list.
The registration keys for the pre-em pted initiators are rem oved by the Pre-em pt
service action; the reservation key for an initiator that has perform ed a Pre-
em pt service action with its own Reservation key specified in the Service action
Reservation key rem ains unchanged, although all other specified releasing ac-
tions and reservation actions are perform ed.
04h
Pre-em pt
Note that persistent reservations are not superseded by a new persistent res-
ervation from any initiator except by the execution of a PERSISTENT RESER-
VATION OUT that specifies either the Pre-em pt or the Pre-em pt and Clear
service actions. New persistent reservations that do not conflict with an exist-
ing persistent reservation execute norm ally. The persistent reservation of a log-
ical unit or extents having the sam e Type value are perm itted if no conflicting
persistent reservations other than the reservations being pre-em pted are held
by another initiator.
Note: Service Action (Code) 4 is not supported by Atlas 10K III.
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SCSI Description
A PERSISTENT RESERVATION OUT com m and with a Pre-em pt & Clear service
action rem oves all persistent reservations for all initiators that have been regis-
tered with the Service action Reservation key specified in the PERSISTENT
RESERVATION OUT com m and’s param eter list. It also establishes a persistent
reservation for the pre-em pting initiator. Any com m ands from the initiators be-
ing pre-em pted are term inated as if an ABORT TASKm anagem ent function had
been perform ed by the pre-em pted initiator. If a PERSISTENT RESERVATION
OUT com m and is sent that specifies a Pre-em pt & Clear service action and no
persistent reservation exists for the initiator identified by the Service action
Reservation key, it is not an error condition. If the key is registered, however,
the Clear portion of the action executes norm ally.
A UNIT ATTENTION condition is established for the pre-em pted initiators. The
sense key is set to UNIT ATTENTION; the additional sense data is set to RES-
ERVATIONS PREEMPTED. Com m ands that follow, and retries of com m ands
that tim ed out because there were cleared are subject to the persistent reser-
vation restrictions set by the pre-em pting initiator.
The persistent reservation thus created by the pre-em pting initiator is defined
by the Scope and Type fields of the PERSISTENT RESERVATION OUT com -
m and and the corresponding fields of the com m and’s param eter list.
Pre-em pt &
Clear
05h
The Pre-em pt & Clear service action clears any ACA or CA condition associated
with the initiator that is pre-em pted and clears any tasks with an ACA attribute
from that initiator.
Any Asynchronous Event Reporting operations in progress that were initiated
by the device server are unaffected by a Pre-em pt and Clear service action.
The reservation key for the other initiators pre-em pted are rem oved by the Pre-
em pt & Clear service action. The reservation key for an initiator that has sent
a Pre-em pt & Clear action with its own reservation key specified in the service
action’s reservation key rem ains unchanged, although all other specified clear-
ing actions, releasing actions, and reservation actions are perform ed.
Persistent reservations are not superseded by a new persistent reservation from
any initiator except via execution of a PERSISTENT RESERVATION OUT that
specifies either the Pre-em pt or Pre-em pt &Clear service action. New persistent
reservations not in conflict with an existing persistent reservation execute nor-
m ally. The persistent reservation of a logical unit or extent that has the sam e
Type value is perm itted as long as no conflicting persistent reservations other
than the reservations being pre-em pted are perm itted.
from the Type field of the PER SISTENT RESER VATION IN Read R eservations
parameters.
Each of the codes provides handling instructions for R EAD operations, for WR ITE
operations, and for subsequent attempts to establish persistent reservations (referred to
as “Additional R eservations Allowed” in the table).
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SCSI Description
Persistent Reservation Type Codes and Their Meanings
READS: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers from the disk to the initiator.
WRITES: Prohibited; any com m and from any initiator that perform s a trans-
fer from the initiator to the disk results in a reservation conflict.
0h
READ Shared
ADDITIONAL RESERVATIONS: Allowed; any initiator m ay reserve the logi-
cal unit, extents, or elem ents as long as the persistent reservations do not
conflict with any reservations already known to the device server.
READS: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers from the disk to the initiator.
WRITES: Exclusive; any com m and from any initiator other than the initiator
that holds the persistent reservation that attem pts a transfer to the disk re-
sults in a reservation conflict
WRITE Exclu-
sive
1h
ADDITIONAL RESERVATIONS: Allowed; any initiator m ay reserve the logi-
cal unit, extents, or elem ents as long as the persistent reservations do not
conflict with any reservations already known to the device server.
READS: Exclusive; any com m and from any initiator other than the initiator
that holds the persistent reservation that attem pts a transfer from the disk
results in a reservation conflict
WRITES: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers to the disk from the initiator.
2h
READExclusive
ADDITIONAL RESERVATIONS: Allowed; any initiator m ay reserve the logi-
cal unit, extents, or elem ents as long as the persistent reservations do not
conflict with any reservations already known to the device server.
READS: Exclusive; any com m and from any initiator other than the initiator
holding the persistent reservation that attem pts a transfer from the disk re-
sults in a reservation conflict.
WRITES: Exclusive; any com m and from any initiator other than the initiator
holding the persistent reservation that attem pts a transfer to the diskresults
in a reservation conflict.
Exclusive Ac-
cess
3h
ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVA-
TION OUTcom m and with the Reserve service action from any initiator other
than the initiator holding the persistent reservation results in a reservation
conflict. The initiator that holds the persistent reservation can reserve the
logical unit, extents, or elem ents as long as the persistent reservations do
not conflict with any reservations already known to the device server.
READS: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers from the disk to the initiator.
WRITES: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers to the disk from the initiator.
4h
Shared Access
ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVA-
TION OUTcom m and with the Reserve service action from any initiator other
than the initiator holding the persistent reservation results in a reservation
conflict. The initiator that holds the persistent reservation can reserve the
logical unit, extents, or elem ents as long as the persistent reservations do
not conflict with any reservations already known to the device server.
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SCSI Description
READS: Shared; any application client on any initiator m ay execute com -
m ands that perform transfers from the disk to the initiator.
WRITE
WRITES: Exclusive; any com m and from an initiator that has not previously
perform ed a Register service action with the device server that attem pts a
transfer to the disk results in a reservation conflict
Exclusive,
5h
Registrants
Only
ADDITIONAL RESERVATIONS: Allowed; any initiator m ay reserve the logi-
cal unit, extents, or elem ents as long as the persistent reservations to not
conflict with any reservations already known to the device server.
READS: Exclusive; any com m and from an initiator that has not previously
perform ed a Register service action with the device server that attem pts a
transfer from the disk results in a reservation conflict.
WRITES: Exclusive; any com m and from an initiator that has not previously
perform ed a Register service action with the device server that attem pts a
transfer to the disk results in a reservation conflict
ADDITIONAL RESERVATIONS: Allowed; any initiator m ay reserve the
logical unit, extents, or elem ents as long as the persistent reservations
to not conflict with any reservations already known to the device
server.
N/ A
The PER SISTENT R ESER VATION OUT command requires a parameter list,
parameter list are sent for every PER SISTENT RESER VATION OUT command,
even if the field is not required for the specific Service action and/ or Scope values
.PERSISTENT RESERVATION OUT Parameter List-Data Format
(MSB)
0 – 7
Reservation Key
(LSB)
(MSB)
8 – 15
Service Action Reservation Key
(LSB)
(MSB)
Scope-Specific Address
(LSB)
16 – 19
20
21
Reserved
Reserved
APTPL
(LSB)
(MSB)
Extent Length
22 – 23
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SCSI Description
PERSISTENT RESERVATION OUT Parameter List-Field Descriptions
This field contains an 8-byte token that is provided by the application client to the
device server to identify which initiator is the source of the PERSISTENT RESERVA-
TION OUT com m and. The device server verifies that the Reservation Key in the PER-
SISTENT RESERVATION OUT com m and m atches the Reservation Key that is
registered for the initiator from which the com m and is received. If there is no m atch,
the device server returns a RESERVATION CONFLICT status. The Reservation Key
of the initiator is valid for all Service action and Scope values.
Reservation
Key
This field contains inform ation needed for 3 service actions: the Register service ac-
tion, the Pre-em pt service action, and the Pre-em pt & Clear service action. The Ser-
vice Action Reservation Key is ignored for all other service actions.
For the Register service action, the Service Action Reservation Key field contains the
new Reservation Key to be registered.
Service Action
Reservation
Key
For the Pre-em pt and the Pre-em pt & Clear service actions, the Service Action Res-
ervation Key contains the reservation key of the persistent reservations that are be-
ing pre-em pted. For the Pre-em pt and the Pre-em pt & Clear actions, any failure of
the Service Action Reservation Key to m atch any registered keys results in the de-
vice server returning a RESERVATION CONFLICT status.
If the Scope is an Extent reservation, this field contains the Logical Block Address of
the extent and the Extent Length field (bytes 22 – 23) contain the num ber of blocks
in the extent.
Scope-Specific
Address
If the Scope signifies an Elem ent reservation, the Scope-Specific Address field con-
tains the Elem ent Address, zero-filled in the m ost significant bytes to fit the field; the
Extent Length is set to 0.
If the Service action is Register or Clear, or if the Scope is a Logical Unit reservation,
both the Scope-Specific Address and Extent Length fields are set to 0.
Activate Persist Through Power Loss. This bit is valid only for Register service ac-
tions; it is ignored for all other types of service actions.
Support for APTPL set to 1 is optional. If a device server that does not support APT-
PL receives a 1 in that bit in a Register service action, it returns a CHECK CONDITION
status, with the sense key set to ILLEGAL REQUEST and additional sense data set
to INVALID FIELD IN PARAMETER LIST.
APTPL
If the last valid APTPL bit value received by the device server is 0, the loss of power
in the target releases any persistent reservations and rem oves all reservation keys.
If the last valid APTPL bit value is 1, the logical unit retains all persistent reservations
and all reservation keys for all initiators even if power is lost and later returned. The
m ost recently received valid APTPL value from any initiator governs the logical unit’s
behavior in the event of a power loss.
the device server for each Service and Scope value.
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SCSI Description
Device Server Interpretation of Service and Scope Value
Register
Reserve
Ignored
LU
Ignored
Valid
Valid
Ignored
Ignored
Ignored
Ignored
Ignored
Ignored
Ignored
Ignored
Valid
Ignored
Ignored
Reserve
Extent
Elem ent
LU
Valid
Extent Valid
Ignored
Reserved
Release
Valid
Valid
Ignored
Release
Extent
Elem ent
Ignored
Ignored
LU
Valid
Extent Valid
Elem ent Valid
Ignored
Release
Valid
Clear
Ignored
Ignored
Valid
Clear
Ignored
Pre-em pt
Pre-em pt
Pre-em pt
Pre-em pt & Clear
Pre-em pt & Clear
Pre-em pt & Clear
Ignored
Extent
Elem ent
LU
Valid
Valid
Extent Valid
Elem ent Valid
Ignored
Valid
Valid
Valid
Valid
Extent
Elem ent
Valid
Valid
Extent Valid
Elem ent Valid
Valid
Valid
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SCSI Description
The R EAD (6) command requests that data be transferred from the drive to the
initiator. The amount of data transferred is specified by the transfer length field. The
starting point is specified by the logical sector address. The data format and field
READ (6) Command-Data Format
0
Operation Code (08h)
Logical Block Address
1
Reserved
2 - 3
Logical Block Address (continued)
Transfer Length
4
5
Control
READ (6) Command-Field Descriptions
Specifies the logical block address where the
read operation will begin.
Logical Block Address
Specifies the num ber of contiguous logical
blocks of data to transfer. A transfer length of
0 indicates that 256 logical blocks will be trans-
ferred. Any other value indicates the num ber of
logical blocks that will be transferred.
Transfer Length
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SCSI Description
The R EAD (10) command requests that data be transferred from the drive to the
initiator. The amount of data transferred is specified by the transfer length field. The
starting point is specified by the logical sector address. The data format and field
READ (10) Command-Data Format
0
1
Operation Code (28h)
DPO FUA
Reserved
Reserved
RelAdr
2 - 5
6
Logical Block Address
Reserved
7 - 8
9
Transfer Length
Control
READ (10) Command-Field Descriptions
Disable Page Out. When the value is 0, the drive caches the data read,
using its norm al Logical Read Unit policies.
DPO
When the value is 1, the drive assigns to logical blocks accessed by the
READ (10) com m and the lowest priority for being fetched into or retained
by the cache.
Force Unit Access. When the value is 0, the drive is allowed to satisfy the
read with cache-resident data.
FUA
A value of 1 indicates that the drive accesses the m edia in perform ing the
com m and before returning GOOD status.
Relative Addressing. The drive does not support relative addressing. Must
be 0
RelAdr
Logical Block Address
Specifies the logical sector address where the read operation will begin.
Specifies the num ber of contiguous logical blocks of data to transfer. A
transfer length of 0 indicates that no logical blocks are to be transferred.
Transfer Length
Any other value indicates the num ber of logical blocks to be transferred.
The drive returns a CHECK CONDITION status with the correct sense data
if the specified transfer extends beyond the logical sector space.
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SCSI Description
The R EAD BUFFER command is used in conjunction with the WR ITE BUFFER
command. It allows the initiator to gain access to the data storage areas within the
drive's controller. In particular, these two commands are used to check the integrity
of the buffer-initiator data path, independent of the media, typically for fault isolation
in the event of a failure. In addition, these commands can be used to verify the caching
policies of the drive controller or other kinds of diagnostic and verification work.
Both the R EAD BUFFER and the WR ITE BUFFER commands have a buffer ID
and a buffer offset data field defined in their Control Descriptor Block. In the
Combined Header and Data Mode, if both are set to 0, reference is made to a single
512-byte buffer set aside in the drive controller's data memory (independent of cache).
This allows an initiator to verify the data path from the controller's data memory to
the initiator without affecting the drive's internal data caches. The data format and field
READ BUFFER Command-Data Format
0
1
2
Operation Code (3Ch)
Reserved
Mode
Buffer ID
Buffer Offset
Allocation Length
Control
3 - 5
6 - 8
9
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SCSI Description
READ BUFFER Command-Field Descriptions
Four m odes are supported by the drive; Com bined Header and Data, Data Only, Descrip-
tor Only, and Read Data from Echo Buffer. The perm issible values for Buffer ID, Buffer
Offset, are as follows:
Mode
0000b
Com bined Header and Data – In this m ode, data to be transferred is preceded by a 4-
byte header that contains the buffer capacity. The resulting descriptor and data are trans-
ferred to the initiator during the com m and’s data-in buffer transfer.
m ust be 0
m ust be 0
Allocation length m ust be set to between 0 and 516 (4 bytes of header and up to 512
bytes of data).
Data Only– In this m ode, the data-in buffer transfer contains data from the controller’s
m em ory.
. When non-zero, the value specifies a specific track line in the controller’s
cache. If Buffer ID of zero is specified, the buffer referenced is the sam e as if a Buffer ID
of one were specified.
0010b
. When non-zero, the value of Buffer Offset can range from 0 to one less
than the num ber of sectors/track m ultiplied by 512. This value m ust be either a zero or
a m ultiple of 512.
Must be between zero and the m axim um num ber of sectors/track m ul-
tiplied by 512.
Descriptor Only
When requesting a descriptor (a description of the buffer referenced in the Buffer IDfield),
the resulting data is the offset boundary requirem ents and the length of each buffer.
When non-zero, the value specifies a specific track line within the controller’s
cache. If Buffer ID of 0 is specified, the buffer referenced is the sam e as if a Buffer ID of
1 were specified.
0011b
1010b
Must be zero
Must be between 4 (header) and the m axim um num ber of sectors/
track m ultiplied by 512 + header size.
Read Data from Echo Buffer
In this m ode, the drive transfers data to the host from the echo buffer. The echo buffer
will transfer the sam e data as when the WRITE BUFFER com m and with the m ode field
set to echo buffer was issued.
Ignored.
Ignored.
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SCSI Description
The R EAD CAPACITY command reports formatted capacity and track-boundary
READ CAPACITY Command-Data Format
0
Operation Code (25h)
Reserved
1
RelAdr
PMI
2 - 5
6 - 7
8
Logical Block Address
Reserved
Reserved
9
Control
READ CAPACITY Command-Field Descriptions
Relative Addressing is not supported by the drive; the field m ust
be 0.
RelAdr
Logical Block Address
Used in conjunction with the PMI bit. Must be 0 when the PMI bit
is 0.
Partial Media Indicator. When the value in the field is 0, the Re-
ical sector of the logical unit.
When the value is 1, the Returned Logical Block Address is that
of the last sector on the sam e cylinder as the Logical Block Ad-
dress supplied in the Com m and Descriptor Block's LBAfield. That
is, the Returned Logical Block Address is that of the Logical Block
Address before a substantial delay in data transfer will be encoun-
tered).
PMI
logical sector size, as determ ined by the Block Length field in the
Mode param eter Block Descriptor.
be sent during the data-in buffer transfer for the command. R efer to the PMI
READ CAPACITY Returned Data-Data Format
0 - 3
Returned Logical Block Address
Block Length in Bytes
4 - 7
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SCSI Description
The R EAD DEFECT DATA (10) command directs the drive to report defect
information about the drive’s medium. R efer to the FOR MAT UNIT command for
information about defects. The data format and field descriptions are shown in Table
The R EAD DEFECT DATA (10) Command Descriptor Block is shown in
READ DEFECT DATA (10) Command-Data Format
0
Operation Code (37h)
Reserved
1
2
Reserved
Plist
Glist
Defect List Form at
3 - 6
Reserved
(MSB)
7 - 8
9
Allocation Length
Control
(LSB)
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SCSI Description
READ DEFECT DATA (10) Command-Field DescriptionREAD DEFECT
When the value is 0, the returned data does not include the Prim ary Defect List.
PList
GList
When the value is 1, the returned data includes the Prim ary Defect List. The defects
are returned in ascending order.
When the value is 0, the returned data does not include the Grown Defect List.
When the value is 1, the returned data includes the Grown Defect List. The defects
are returned in order of occurrence.
When both PList and GList are set to 1, the Prim ary Defect List and the Grown Defect
List are returned. The Plist is returned followed by the Glist (the lists are not m erged).
initiator.
Defect List
Form at
This field specifies the form at in which the defect descriptors are to be returned. The
supported form ats are:
000b
Bytes from the Index (Figure 5-63). The data re-
turned from this m ode does not include defects
outside norm al user space.
100b
m at. The defects returned from this m ode do not
include defects outside norm al user space.
101b
110b
Vendor-Unique Form at. This form at is valid only
for the READ DEFECT DATA com m ands. The data
returned from this m ode does not include defects
outside norm al user space. Note that the vendor-
unique form at is proprietary in nature and thus is
not docum ented in this Product Manual.
1 All in-line spared blocks do not have an associated LBA, and, therefore, will not be
seen in Logical Block Format.
Defect Descriptor-Block Format.
0 - 3
Defective Block Address
Format is 100b or the Physical Sector Format when the Defect List Format is 101b.
Defect Descriptor-Bytes From Index Format, or Physical Sector Format
0 - 2
Cylinder Num ber of Defect
Head Num ber of Defect
3
4 - 7
Defective Bytes From Index / Defective Sector Num ber
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SCSI Description
Defect List Header -Data Format
0
1
Reserved
Reserved
Plist
Glist
Defect List Form at
2 - 3
Defect List Length
Defect List Header-Field Descriptions
Prim ary Defect List. When the value is 0, the returned data does not include the Prim ary
Defect List.
PList
GList
When the value is 1, the returned data includes the Prim ary Defect List.
Grown Defect List. When the value is 0, the returned data does not include the Grown
Defect List.
When the value is 1, the returned data includes the Grown Defect List.
Defect List
Form at
This field indicates the form at of the descriptors returned. If this differs from the form at
requested in the Com m and Descriptor Block, a recovered error is returned.
This indicates the actual num ber of bytes that follow the defect list header. The drive
truncates the list if the allocation length is not sufficient to accom m odate the entire list
(CHECK CONDITION status is not returned when this happens). The initiator is respon-
sible for com paring the defect list length and the allocation length to ensure that a partial
list was not received.
Defect List
Length
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SCSI Description
The R EAD DEFECT DATA (12) command directs the drive to report defect
information about the drive’s medium. R efer to the FOR MAT UNIT command for
information about defects. The data sent to the host in the command’s data-in buffer
READ DEFECT DATA (12) Command-Data Format
0
Operation Code (B7h)
1
Reserved
Plist
Glist
Defect List Form at
2 - 5
Reserved
(MSB)
6 - 9
Allocation Length
(LSB)
10
11
Reserved
Control
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SCSI Description
READ DEFECT DATA (12) Command-Field Description
When the value is 0, the returned data does not include the Prim ary Defect List.
PList
GList
When the value is 1, the returned data includes the Prim ary Defect List. The defects
are returned in ascending order.
When the value is 0, the returned data does not include the Grown Defect List.
When the value is 1, the returned data includes the Grown Defect List. The defects
are returned in order of occurrence.
When both PList and GList are set to 1, the Prim ary Defect List and the Grown Defect
List are returned. The Plist is returned followed by the Glist (the lists are not m erged).
initiator.
Defect List
Form at
This field specifies the form at in which the defect descriptors are to be returned. The
supported form ats are:
000b
100b
m ode does not include defects outside norm al user space.
fects returned from this m ode do not include defects outside
norm al user space.
101b
110b
Vendor-Unique Form at. This form at is valid only for the READ
DEFECT DATA com m ands. The data returned from this m ode
does not include defects outside norm al user space. Note that
the vendor-unique form at is proprietary in nature and thus is not
docum ented in this Product Manual.
1 All in-line spared blocks do not have an associated LBA, and, therefore, will not be
seen in Logical Block Format.
Defect Descriptor-Block Format
0 - 3
Defective Block Address
Format is 100b or the Physical Sector Format when the Defect List Format is 101b.
Defect Descriptor-Bytes From Index Format, or Physical Sector Format
0 - 2
3
Cylinder Num ber of Defect
Head Num ber of Defect
4 - 7
Defective Bytes From Index / Defective Sector Num ber
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SCSI Description
Defect List Header-Data Format
0
Reserved
1
Reserved
Plist
Glist
Defect List Form at
2 - 3
4 - 7
Reserved
Defect List Length
Defect List Header-Field Descriptions
Prim ary Defect List. When the value is 0, the returned data does not include the Pri-
m ary Defect List.
When the value is 1, the returned data includes the Prim ary Defect List.
PList
Grown Defect List. When the value is 0, the returned data does not include the
Grown Defect List.
GList
When the value is 1, the returned data includes the Grown Defect List.
Defect List
Form at
This field indicates the form at of the descriptors returned. If this differs from the for-
m at requested in the Com m and Descriptor Block, a recovered error is returned.
This indicates the actual num ber of bytes that follow the defect list header. The drive
truncates the list if the allocation length is not sufficient to accom m odate the entire
list (CHECK CONDITION status is not returned when this happens). The initiator is
responsible for com paring the defect list length and the allocation length to ensure
that a partial list was not received.
Defect List
Length
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SCSI Description
The R EAD LONG command is used in conjunction with the WR ITE LONG
command to allow the initiator to issue raw reads and writes of physical data blocks,
but address them as logical blocks with an assumed sector length of 512 bytes. These
two commands are used to verify the correction capability of the drive’s ECC and to
create a known kind and location to verify the drive’s recovery and bad sector
READ LONG Command Descriptor Block-Data Format
0
Operation Code (3Eh)
Reserved
1
2 - 5
6
Correct
RelAdr
Logical Block Address
Reserved
7 - 8
9
Byte Transfer Length (562)
Control
READ LONG Command Descriptor Block-Field Descriptions
When the value in this field is 1, the drive corrects the data by the ECC before trans-
ferring it to the initiator. When the value is 0, the drive does not perform ECC cor-
rection on the data.
Correct
RelAdr
NOTE: This bit, not the DCR bit of the Read Recovery page, governs the effect of
error correction for the READ LONG com m and.
Relative addressing is not supported by the drive. This value m ust be 0.
Specifies the logical sector to read.
Logical Block Ad-
dress
Must be 562. This value reflects the num ber of bytes spanned by the ECC, including
the ECC itself, rounded up to the next word (this is easiest understood in bits: 4096
data bits + 1 force error bit + 15 Logical Block Address bits + 16 cross check bits
+ 2 pad bits + 360 ECC bits + 6 pad bits that are not written to m edia but are only
needed for transfer = 4496 bits or 562 bytes). Any other value in this field results
in a CHECK CONDITION status and the appropriate sense data.
Byte Transfer
Length
Command's data-in buffer transfer. The returned data always consists of 512 bytes of
data, followed by a two LBA bytes, two EDC bytes, and 46 ECC-related bytes.
READ LONG Command-Returned Data
0 - 511
Data (512 Bytes)
512 - 513
Logical Block Address Bits + Force Error Bit
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SCSI Description
514 - 515
516 - 562
EDC (8 Bits)
45 ECC Bits + 8 Pad Bits
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SCSI Description
The READ SKIP MASK command allows the initiator to condition the function of
the R EAD commands to allow only selected data to be transferred over the SCSI
interface. A R EAD SKIP MASK command precedes a R EAD (10) command; the
R EAD (10) command must be linked to the R EAD SKIP MASK command or the
skip mask is lost and a CHECK CONDITION status is returned. The data format and
READ SKIP MASK Command-Data Format
0
Operation Code (E8h)
Reserved
1
2 - 5
6
(MSB)
Logical Block Address
Skip Mask Length
Transfer Length
Reserved
(LSB)
(MSB)
VU
7 - 8
9
(LSB)
Link
Flag
READ SKIP MASK Command-Field Descriptions
This field specifies the first logical block of the corresponding READ (10)
COMMAND. This allows a SEEK to begin im m ediately. The LBA of the fol-
lowing READ (10) com m and m ust the sam e as the LBA of the READ SKIP
MASK com m and.
LogicalBlockAddress
Skip Mask Length
Transfer Length
This field indicates the length in bytes of the skip m ask. The m ask is up to
2048 bits, giving a data address capability of 1 MB in 512-byte block
length. The m ask consists of a sequence of bits where a “1” bit is for the
blocks of data to be transferred, and a “0” for the blocks of data that are to
be skipped. The first “1” bit of the m ask corresponds to the first LBA to be
transferred. Any unused bits at the end of the last byte in the m ask m ust
be set to 0. The m ask is transferred in the data-out buffer transfer of the
skip m ask com m and.
This field m ust be equal to the transfer length in the linked READ (10) com -
m and. The transfer length field m ust be equal to the num ber of “1” bits in
the skip m ask. If a READ (10) is used with 0 as the transfer length, a trans-
fer length of 256 data blocks is im plied.
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SCSI Description
The REASSIGN BLOCKS Command reassigns one or more logical blocks to a spare
location(s) set aside for this purpose and records the reassignments in the Grown
Defect List.
No command-specific Control Descriptor Block fields affect the processing performed
for this command.
The list of Logical Block Addresses to reassign is supplied in the R EASSIGN
BLOCKS Defect List passed in the command's data-out buffer transfer. The Defect
List Header. If multiple Logical Block Addresses are specified, they are listed in
ascending order.
REASSIGN BLOCKS Command Descriptor Block-Data Format
0
1 - 4
5
Operation Code (07h)
Reserved
Control
REASSIGN BLOCKS Defect List Header-Data Format
0 - 1
2 - 3
Reserved
Defect List Length
REASSIGN BLOCKS Defect List Header -Field Description
The contents of this field indirectly indicates the num ber of defective Logical
Block Addresses passed in the Defect List. The value m ust be four tim es the
num ber of Defect Descriptors supplied. Zero (0) is a valid value and m akes
the com m and a NOP.
Defect List
Length
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SCSI Description
REASSIGN BLOCKS Defect Descriptor-Data Format
0 - 3
Defect Logical Block Address
The drive returns a CHECK CONDITION status if it cannot complete the
command. If this happens because the drive ran out of spare sectors, the drive sets the
sense key to MEDIUM ER ROR and the additional sense code to NO DEFECT
SPAR E LOCATION AVAILABLE. The sense key and additional sense key are set
appropriately for any other cause. The Logical Block Address of the first defect
descriptor not reassigned is returned in the command-specific information field of the
sense data. If all defects were reassigned, but some other error occurred, then
FFFFFFFFh is posted in the command-specific field.
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SCSI Description
The R ECEIVE DIAGNOSTIC RESULTS command fetches the results of the last
SEND DIAGNOSTIC command sent to the drive. The drives support the diagnostic
Diagnostic Pages Supported by The Drives
00h
40h
40h
Supported Diagnostic Pages
Translate Address Page (SEND DIAG)
Translate Address Page (RECEIVE DIAG)
6
14
14 or m ore
The R ECEIVE DIAGNOSTIC R ESULTS Command Descriptor Block is shown in
To receive one or both of the two diagnostic pages that are available, the initiator first
sends the desired page code(s) to the drive using a SEND DIAGNOSTICS command.
The SEND DIAGNOSTICS command tells the drive which page it should return in
response to the next R ECEIVE DIAGNOSTICS R ESULTS command. The page
specified in the most recent SEND DIAGNOSTICS command is always the page
returned in response to the R ECEIVE DIAGNOSTICS R ESULTS command.
RECEIVE DIAGNOSTIC RESULTS Command Descriptor Block-Data Format
0
Operation Code (1Ch)
Reserved
1
PCV
2
3 - 4
5
Page Code Value
Allocation Length
Reserved
Control
RECEIVE DIAGNOSTIC RESULTS Command Descriptor Block-Field Descriptions
Specifies the num ber of bytes of diagnostic-page results the drive is allowed to
send to the initiator. A CHECK CONDITION is not returned if this value trun-
cates the inform ation available.
Allocation
Length
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SCSI Description
tics Pages Page (00h)
Supported Diagnostics Pages Page-Data Format
0
Page Code (00h)
Reserved
1
2 - 3
4
Page Length (0002h)
Supported Diagnostics Pages Page (00h)
Translate Address Page (40h)
5
To obtain the Supported Diagnostics Pages list, the initiator must:
1.Send a Supported Diagnostics Page to the drive with a SEND DIAGNOSTICS
command (the Page Length in the Supported Diagnostics page must be 0).
2.Send a R ECEIVE DIAGNOSTIC R ESULTS command to the drive. The listing
of Supported Diagnostic Pages is returned by the drive.
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SCSI Description
The Translate Address Page allows the initiator to translate a logical sector address,
physical address, or physical bytes for an index address into any one of the other
formats. The address to be translated is passed to the drive with the SEND
DIAGNOSTIC command, and the results are returned to the initiator by the
R ECEIVE DIAGNOSTIC R ESULTS command.
contains a description of the data fields. Multiple translated addresses are returned if
the logical sector size is greater than 512 bytes (more than one physical data sector).
Translate Address Page-Data Format
0
1
Operation Code (40h)
Reserved
2 - 3
Page Length (2 + (8 x ))
(where = num ber of sectors / LBA)
4
5
Reserved
Supplied Form at =
000b (LBA)
RAREA
ALT-
SEC
ALT-
TRK
Reserved
Translate Form at =
101b (Physical Sector)
1
6 - 8
9
Translated Address (Cylinder Num ber)
1
Translated Address (Head Num ber)
1
10 - 13
Translated Address (Sector Num ber or Bytes From Index)
y -
y + 2
Translated Address (Cylinder Num ber)
Where y = (( -1) x 8) + 6
y + 3
Translated Address (Head Num ber)
y + 4
-
y + 7
Translated Address (Sector Num ber or Bytes From Index)
Bytes 6 through 13: One set of these bytes is required for each
sector per Logical Block Address.
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SCSI Description
Translate Address Page-Field Descriptions
The Supplied Form at field specifies the form at of the following Translate Address
field. Must be 000b, which specifies the LBA form at.
Supplied Form at
RAREA
Reserved Area is not used.
An Alternate Sector bit of 1 indicates that the translated address from the SEND DI-
AGNOSTIC com m and is physically located in an alternate sector on the disk.
ALTSEC
When ALTSEC is 0, it indicates either that no part of the translated address is located
in an alternate sector of the m edium or that the drive is unable to determ ine this in-
form ation.
An Alternate Track bit of 1 indicates either that part or all of the translated address
is located on an alternate track of the m edium or, the drive cannot determ ine if all
or part of the translated address is located on an alternate track.
ALTTRK
When ALTTRK is 0, it indicates that no part of the translated address is located on
an alternate track of the m edium
The Translate Form at field specifies the form at into which the initiator wants the ad-
dress translated. The value m ust be 101b, specifying the Physical Sector form at.
TranslateForm at
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SCSI Description
The R ELEASE and the R ESERVE commands are used for contention resolution in
multiple-initiator systems. The R ELEASE command is used to release a previously
reserved logical unit. The drive will not return an error if the initiator attempts to
release a reservation that is not currently valid. The data format and field descriptions
RELEASE (6) Command Descriptor Block-Data Format
0
Operation Code (17h)
1
2
Reserved
3rdPty
Third Party Device ID
Extent
Reservation Identification
Reserved
3 - 4
5
Control
RELEASE (6) Command -Field Descriptions
Third Party Release allows an initiator to release a logical unit that was previously
reserved. If the value in this field is 0, third party release is not requested.
3rdPty
When the value is 1, the drive releases the specified logical unit, but only if the res-
ervation was m ade by the initiator using a third-party reservation that requested the
release for the sam e SCSI device as specified in the Third Party Device ID field.
Required if the 3rdPty bit is 1. This field specifies the SCSI ID (0 through 7 only) of
the initiator whose third party reservation is being released. (This field m ust be set
if the initiator of the original third party RESERVE is the source of the RELEASE.)
Third Party De-
vice ID
Extent
The drive supports reservations only on entire logical units.
Reservation
Identification
Any value in this field is ignored by the drive.
Assuming that the R ELEASE Command Descriptor Block is valid, the drive
always returns a GOOD status for this command. An actual release only hap-
pens if the initiator has the unit reserved for itself or a third-party initiator.
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SCSI Description
The R ELEASE and the R ESERVE commands are used for contention resolution in
multiple-initiator systems. The R ELEASE (10) command is used to release a
previously reserved logical unit. The drive will not return an error if the initiator
attempts to release a reservation that is not currently valid. The data format and field
RELEASE (10) Command Descriptor Block-Data Format
0
Operation Code (57h)
1
2
Reserved
3rdPty
Reserved
LongID
Extent
Reservation Identification
Third Party Device ID
Reserved
3
4 - 6
(MSB)
Param eter List Length
(LSB)
7 - 8
9
Control
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SCSI Description
RELEASE (10) Command — Field Descriptions
Third Party Release allows an initiator to release a logical unit that was previously
reserved. If the value in this field is 0, third party release is not requested. If 3rdPty
= 1, then the device server will release the specified logical unit, but only if the ini-
tiator ID, 3rdPty bit, and third party device ID are identical when com pared to the
RESERVE com m and that established the reservation.
3rdPty
If the Long ID bit is set to 1, the Param eter List Length is 8 and the eight bytes of
the param eter list carry the device ID of the third party device; the contents of the
Third Party Device ID in the CDB (byte 3) are ignored.
LongID
If the Third Party Device ID value that is connected with the reservation release is
sm aller than 255, the LongID bit m ay be 0 and the ID value sent in the CDB. If
LongID bit = 0, the Param eter List Length field also = 0. If the Third Party Device
Third Party De- ID value is greater than 255, LongID = 1.
vice ID
Device servers that support device IDs greater than 255 will accept com m ands with
LongID = 1; device servers that do not support IDs greater than 255 m ay reject
com m ands with LongID set = 1. Device ID form ats are protocol-specific.
Param eter List
Length
The contents of this field specify the length, in bytes, of the param eter list that will
be transferred from the initiator to the target.
Extent
The drive supports reservations only on entire logical units.
Reservation
Identification
Any value in this field is ignored by the drive.
Assuming that the R ELEASE Command Descriptor Block is valid, the drive
always returns a GOOD status for this command. An actual release only hap-
pens if the initiator has the unit reserved for itself or a third-party initiator.
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SCSI Description
The R EPOR T DEVICE IDENTIFIER command requests that the device server
send device identification to the application client. The data format and field
REPORT DEVICE IDENTIFIER Command Descriptor Block-Data Format
0
1
Operation Code (A3h)
Reserved
Service Action (05h)
2 – 5
Reserved
(MSB)
Allocation Length
(LSB)
6 – 9
10
11
Reserved
Control
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SCSI Description
REPORT DEVICE IDENTIFIER Command Descriptor Block-Field Descriptions
. Any other value forces Check Condition, Illegal
Service Action
Request.
If the length is not sufficient to contain all of the param eter da-
ta, the first portion of the data is returned, and this is not con-
sidered to be an error. The actual length of the param eter data
is available in the Identifier Length field in the param eter data.
If the rem ainder of the param eter data is required, the applica-
Allocation Length
tion client m ust send a new REPORT DEVICE IDENTIFIER com -
m and with an Allocation Length field large enough to contain
all of the data.
The R EPOR T DEVICE IDENTIFIER command’s parameter list contains a 4-byte
field that provides the length, in bytes, of the parameter list and the logical unit’s
5-168 respectively.
.REPORT DEVICE IDENTIFIER Parameter List-Data Format
(MSB)
0 – 3
4 – n
Identifier Length (n – 4)
(LSB)
Identifier
REPORT DEVICE IDENTIFIER Parameter List-Field Descriptions
This field specifies the length, in bytes, of the Identifier field.
If the Allocation Length field in the CDB is insufficient in size
to transfer all of the Identifier, the length is not adjusted to re-
flect any truncation of inform ation. The Identifier is initially set
= 0, and is changed only by a successful SET DEVICE IDEN-
TIFIER com m and.
Identifier Length
The value reported in this field is a vendor-specific value and
is the last value written by a successful SET DEVICE IDENTI-
FIER com m and. The value of the Identifier is changed only by
a successful SET DEVICE IDENTIFIER com m and. The Identifier
value persists through device resets, power cycles, and for-
m atting of m edia.
Identifier
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SCSI Description
The R EPOR T LUNS command requests that the peripheral device logical unit
numbers of known logical units in the target disk be sent to the applications client.
The command only returns information about the logical units to which commands
REPORT LUNS Command Descriptor Block-Data Format
0
Operation Code (A0h)
Reserved
1 - 5
(MSB)
Allocation Length
(LSB)
6 – 9
10
11
Reserved
Control
REPORT LUNS Command Descriptor Block-Field Description
If the Allocation Length is not sufficient to contain the logical unit num ber val-
ues for all configured logicalunits, the device server stillreports as m any logical
num ber values as will fit in the Allocation Length.
Allocation
Length
LUN Reporting Parameter List -Data Format
(MSB)
0 - 3
4 - 7
LUN List Length (n – 7)
Reserved
(LSB)
(LSB)
(MSB)
8 - 15
LUN (first LUN)
n-7 –
n
LUN (last LUN, if m ore than one)
The LUN List Length field contains the length in bytes of the LUN list that can be
transferred. The LUN list length equals the number of logical unit numbers reported
multiplied by eight. If the allocation length in the CDB is too small to allow transfer
of information about all of the logical units configured, the LUN list length value is
not adjusted to reflect the truncation. The data format for the LUN Reporting
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SCSI Description
The REQUEST SENSE command causes the drive to transfer detailed sense data to
the initiator. The drive maintains sense data on an individual initiator basis. The data
REQUEST SENSE Command Descriptor Block-Data Format
0
Operation Code (03h)
1 - 3
Reserved
Allocation Length
Control
4
5
REQUEST SENSE Command Descriptor Block-Field Description
Allocation
Length
The drives can return a m axim um of 18 bytes of sense data. The initiator
should set this field to the m axim um value to receive all the sense data.
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SCSI Description
Sense data is available if the initiator is responsible for an in-progress FOR MAT
UNIT command (Format Progress Indication is available in the Format Progress
Indication Bytes).
The drive returns a sense key of NO SENSE and an additional sense code of NO
ADDITIONAL SENSE INFOR MATION if it has no sense data available for the
initiator.
For Parallel SCSI disk drives, sense data is available if the previous command from the
initiator terminated with a CHECK CONDITION status, or if the previous
command from the initiator ended with an unexpected BUS FREE error.R EQUEST
Clearing Sense Data
Sense data is cleared from the drive's memory by one of the following conditions:
• After being returned from a REQUEST SENSE command.
• As soon as any other command is received from the initiator except
INQUIR Y.
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SCSI Description
The drive returns CHECK CONDITION status for a REQUEST SENSE command
only to report errors specific to the command when:
• A non-zero reserved bit is detected in the Command Descriptor Block.
• A drive malfunction prevents return of the sense data.
For Parallel SCSI disk drives, the drive also returns CHECK CONDITION status for
a R EQUEST SENSE command to report errors specific to the command when an
unrecovered parity error is detected on the data bus.
Note that any of the previous conditions overwrites the current sense data with the
sense data describing the error encountered by the R EQUEST SENSE command
(that is, for the condition stated in the first bulleted entry, the new sense data reflects
that a non-zero reserved bit was detected in the Command Descriptor Block).
The drive returns a maximum of 18 bytes of sense data. The initiator should set the
Allocation Length field in the Command Descriptor Block to 18 to receive all sense
data. If the Allocation Length is set to 0, four bytes of data will be returned (this option
maintains compatibility with SCSI-1 systems).
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SCSI Description
The sense data format for error code 70h (current error) and error code 71h (deferred
Sense Data Format for Error Code 70h or 71h-Data Format
0
1
2
Valid
Error Code (70h or 71h)
Segm ent Num ber = 00h
FileMrk
= 0
EOM
= 0
ILI
Rsvd
Sense Key
3 - 6
7
Inform ation
Additional Sense Length = 0Ah
Com m and-Specific Inform ation
Additional Sense Code
8 - 11
12
13
Additional Sense Code Qualifier
Field Replaceable Unit Code
Sense-Key Specific
14
15
SKSV
16 -
17
Sense-Key Specific (continued)
Sense Data Fields (Error Code 70h)-Field Descriptions
The Valid bit, when set to 1, indicates that the Inform ation field contains valid inform a-
tion, as defined below. When set to 0, it indicates that the contents of the Inform ation
field are not as defined below.
Valid
Either 70h, indicating that current errors are to be reported, or 71h, indicating deferred
errors are to be reported.
Error Code
Segm ent
Num ber
This feature is not supported and will return a zero value.
The File Mark field is reserved for sequential access devices This field will return a zero
value.
FileMrk
EOM
The End-of-Medium field is reserved for sequential access and printer devices. This field
will return a zero value.
Incorrect Length Indicator. When this bit is set to 1, it indicates that the requested logical
sector length did not m atch the logical sector length of the data on the m edia. This field
is only set for incorrect byte transfer lengths on a READ LONG and WRITE LONG com -
m and descriptor block.
ILI
The sense key, additional sense code, and additional sense code qualifier provide a hier-
archy of inform ation. The sense key provides the highest level of inform ation about error
and exception conditions.The additionalsense code and qualifier provided m ore detailed
inform ation.
Sense Key
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SCSI Description
The Inform ation field contains the following device-type or com m and-specific inform a-
tion:
1) The unsigned logical sector address associated with the sense key.
Inform a-
tion
2) The difference between the requested length and the actual length in either bytes or
sectors, as determ ined by the com m and. This difference is called the residue.
3) A description of each of the drive's supported com m ands definition for this field is
The Additional Sense Length field indicates the num ber of addition sense bytes that can
follow. If the Allocation Block Length specified in the Com m and Descriptor Block is too
sm all to transfer all of the additional sense bytes, the Additional Sense Length byte value
is not adjusted to reflect the truncation.
Additional
Sense
Length
Command-
Specific
Inform a-
tion
The Com m and-Specific Inform ation field is valid only for Sense Data for a failed REAS-
SIGN BLOCKS com m and. It contains either the Logical Block Address of the first defect
descriptor not reassigned or, if all the defect descriptors were reassigned, FFFFFFFFh.
The Additional Sense Code field indicates further inform ation related to the error or ex-
ception condition reported in the sense key. If the drive does not have further related
inform ation, the additional sense key is set to NO ADDITIONAL SENSE INFORMATION.
Additional
Sense
Code
Additional
Sense
The Additional Sense Code Qualifier field indicates detailed inform ation related to the ad-
Code Qual- ditional sense code. If the drive does not have detailed inform ation, the field is set to 0.
ifier
Field Re-
placeable
Unit
The Field Replaceable Unit Code specifies a unit that has failed:
Code
FRU
1
2
3
Host
Hard Disk Assem bly (HDA)
Printed Circuit Board Assem bly (PCBA)
tion: NOT READY and UNIT ATTENTION/RPL Status Change). The SKSV bit and Sense-
Key Specific bytes m ay be 0 when the sense key is NOT READY.
SKSV
sum m arizes the sense keys for which the drive supplies sense-key specific inform ation.
(See SKSV.)
Sense-Key
Specific
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SCSI Description
Supported Sense Keys
There is no specific sense key inform ation to be reported for the designated
logical unit. This is the case for a successful com m and or a com m and that
received CHECK CONDITION or COMMAND TERMINATED status because
one of the following bits is set to 1: File Mark, EOM, or ILI.
NO SENSE
0h
1h
The last com m and com pleted successfully with som e recovery action per-
form ed by the drive. Details m ay be contained in the additional sense bytes
and the Inform ation field. When m ultiple recovered errors occur during one
com m and, the choice of which error to report (first, last, m ost severe, etc.)
is device specific.
RECOV-
EREDERROR
The logical unit cannot be accessed. Operator intervention m ay be required
to correct this condition.
NOT READY
2h
3h
The com m and term inated with a non-recovered error condition that was
probably caused by a flaw in the m edium or an error in the recorded data.
This sense key can also be returned if the drive is unable to distinguish be-
tween a flaw in the m edium and a specific hardware failure (Sense Key
MEDIUM
ERROR
The drive detected a non-recoverable hardware failure while perform ing the
com m and or during a self-test. The error type could be controller failure, de-
vice failure, etc.
HARDWARE
ERROR
4h
5h
The drive detected an illegal param eter in the Com m and Descriptor Block or
in the additional param eters supplied as data for som e com m ands. If the
drive detects an invalid param eter in the Com m and Descriptor Block, it ter-
m inates the program without altering the m edium . If the drive detects an
invalid param eter in the additional param eters supplied as data, the drive
m ay have already altered the m edium . This sense key m ay also indicate that
an invalid IDENTITY m essage was received.
ILLEGAL
REQUEST
The drive generates this sense key whenever the drive is reset by a TARGET
RESET m essage, a hard reset condition, or by a power-on reset. Other con-
ditions that generate a UNIT ATTENTION include:
The m ode param eters in effect for this initiator have been changed by an-
other initiator.
• The m icrocode has been changed.
UNIT
ATTENTION
6h
• Tagged com m ands queued for this initiator were cleared by another initi-
ator.
• INQUIRY data has been changed.
• The m ode param eters in effect for the initiator have been restored from
non-volatile m em ory.
• Other events that require the attention of the initiator.
DATA
A Read or Write com m and was attem pted on a sector that is protected for
this operation. The requested operation was not perform ed.
7h
9h
Bh
Eh
PROTECT
VENDOR
SPECIFIC
This sense key is used to report specific Maxtor conditions.
ABORTED
COMMAND
The drive aborted the com m and. The initiator m ay be able to reissue the
com m and successfully.
MISCOM-
PARE
The source data did not m atch the data read from the m edium (i.e., a m is-
m atch).
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SCSI Description
Sense Key Information Field Contents
The address of the first bad sector encountered during the form at
operation. This sector, and all other bad sectors found during a for-
m at operation, are autom atically reallocated by the drive.
RECOVERED
ERROR
FORMATUNIT
ILLEGAL
REQUEST
The first illegal defect descriptor encountered in the Defect De-
scriptor List.
The address of the first bad sector found during the read (possible
only when PER=1, DTE=0, and DCR=0.). For a RECOVERED ER-
ROR, the last Logical Block Address in the error is returned; for a
MEDIUM ERROR the first Logical Block Address is returned.
RECOVERED/
MEDIUM
ERROR
READ(6)(10)
READ LONG
RECOVERED/
MEDIUM
ERROR
READ(6)(10) error recovery qualifiers apply. The inform ation field
echoes this com m and's Logical Block Address field.
The transfer length residue (requested, m inus correct length) if the
transfer length is wrong.
ILLEGAL
REQUEST
REASSIGN
BLOCKS
HARDWARE
ERROR
The address of the first logical sector is not reassigned (the drive
ran out of spare sectors).
ILLEGAL
REQUEST
The first illegal defect descriptor encountered in the Defect De-
scriptor List.
ILLEGAL
SEEK(6)(10)
VERIFY
The first invalid sector address detected by the com m and.
REQUEST
WRITE(6)(10) error recovery qualifiers apply. Contains the Logical
Block Address that m ay have failed the write or verify (com pare)
operation. For a RECOVERED ERROR, the last Logical Block Ad-
dress in the error is returned; for a MEDIUM ERRORthe first Logical
Block Address is returned.
RECOVERED/
MEDIUM
ERROR
The address of the first bad sector found during the write. (Possible
only when PER=1, DTE=0, and DCR=0.) For a RECOVERED ER-
ROR, the last Logical Block Address in the error is returned; for a
MEDIUM ERROR the first Logical Block Address is returned.
RECOVERED/
MEDIUM
ERROR
WRITE(6)(10)
WRITE(6)(10) error recovery qualifiers apply. This field contains the
Logical Block Address that m ay have failed the write or verify
(com pare) operation. For a RECOVERED ERROR, the last Logical
Block Address in the error is returned; for a MEDIUM ERROR the
first Logical Block Address is returned.
RECOVERED/
MEDIUM
ERROR
WRITE AND
VERIFY
RECOVERED/
MEDIUM
ERROR
Write (10) error recovery qualifiers apply. The inform ation field ech-
oes the WRITE LONG com m and’s Logical Block Address.
WRITE LONG
The transfer length residue (requested m inus correct length) if the
transfer length is wrong.
ILLEGAL
REQUEST
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SCSI Description
Supported Additional Sense Codes and Sense Code Qualifiers (in Hex)
0x00
0x0B
0x5D
0x00
0x01
0x00
MISC
EC_NO_ERROR
No additional sense information
SMART overtemperature trip
Smart triggered
SMART EC_RWS_TrippedThermal
SMART EC_RQS_EWS_Tripped
Smart triggered due to Read TA
Factor
0x5D
0x5D
0x5D
0x5D
0x5D
0x5D
0x5D
0x5D
0x01
0x02
0x14
0x32
0x37
0x38
0x41
0x50
SMART EC_RWS_TrippedTAFactor
SMART EC_RWS_TrippedErrFactor
SMART EC_RWS_CBBTable
SMART EC_RWS_CReadError
SMART EC_RWS_CReadErrorTA
SMART EC_RWS_CWriteErrorTA
SMART EC_RWS_CWriteError
SMART EC_RWS_CCSS
Smart triggered due to Write Err
Factor
Smart triggered due to bad block
% free (Compaq)
Smart triggered due to read
errors (Compaq)
Smart triggered due to TA read
errors (Compaq)
0x00
No
Sense
Smart triggered due to TA write
errors (Compaq)
Smart triggered due to write
errors (Compaq)
Smart triggered due to contact
start stop (Compaq)
0x5D
0x5D
0x5E
0x5E
0x5E
0x5E
0x5B
0xFF
0x00
0x01
0x02
0x03
SMART EC_RWS_TrippedSpinFail
SMART EC_RQS_EWS_TestTripped
Smart triggered due to spin retry
Smart test trigger
HW
HW
HW
HW
EC_PWR_ACTIVE
EC_PWR_IDLE
Power State: ACTIVE
Power State: IDLE
EC_PWR_STANDBY
EC_PWR_SLEEP
Power State: STANDBY
Power State: SLEEP
EC_REC_NO_SEEK_
COMPLETE
0x02
0x00
DER
No seek complete: recovered.
0x03
0x03
0x00
0x01
DER
DER
EC_REC_WRITE_FAULT
EC_REC_PRE_AMP_WUS
Write fault: recovered.
Pre-Amp write unsafe: recovered.
EC_REC_TRK_FOLLOW_
ERR
0x09
0x00
DER
Track following error: recovered.
0x01
Rec
Error
0x0B
0x0C
0x01
0x00
SMART EC_EWS_TrippedThermal
RDWR EC_REC_WRITE_ERR
SMART overtemperature trip
Recovered write error
EC_REC_WR_AUTO_
REALLOC
Write error - recovered with auto
reallocation.
0x0C
0x15
0x15
0x01
0x02
0x80
DER
Positioning error detected by
read: recovered.
DER
DER
EC_REC_POS_ERR
Positioning error detected by
read on write: recovered.
EC_REC_POS_ERR_WRT
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SCSI Description
Servo Write Not OK assertion:
recovered.
0x15
0x81
DER
EC_REC_SERVO_WNOK
Servo Read Not OK assertion:
recovered.
0x15
0x15
0x16
0x82
0x83
0x00
DER
DER
DER
EC_REC_SERVO_RNOK
EC_REC_SPK_ADR_ERR
Spoke address error: recovered.
EC_REC_DATA_SYNC_
ERR
Data synchronization mark error:
recovered.
EC_REC_SPOKE_SYNC_
ERR
Spoke synchronization mark
error: recovered.
0x16
0x17
0x83
0x00
DER
DER
Recovered data with no ECC
applied.
EC_REC_DATA_NO_ECC
0x17
0x01
DER
EC_REC_DATA_WITH_RETRIE Recovered data with retries.
S
0x17
0x17
0x17
0x91
0x92
0x93
SERVO EC_REC_SVO_TA_ERR
SERVO EC_REC_SVO_TA_ERR_2
SERVO EC_REC_SVO_BAD_SYNC
TA Err-1st. - recovered.
TA Err-2nd. - recovered.
Bad Sync-1st. - recovered.
EC_REC_SVO_BAD_
SYNC_2
0x17
0x01
0x94
0x95
0x96
0x97
0x98
0x99
0x9a
0x9b
0x9c
SERVO
Bad Sync-2nd. - recovered.
Rec
EC_REC_SVO_GREY_
SERVO
Grey Code Quality Err-1st. -
recovered.
0x17
Error
QUALITY_ERR
EC_REC_SVO_GREY_
SERVO
Grey Code Quality Err-2nd. -
recovered.
0x17
0x17
0x17
0x17
0x17
0x17
0x17
QUALITY_ERR_2
EC_REC_SVO_HEAD_
SERVO
Head Spoke Num
Miscompare-1 - recovered.
SPOKE_NUM_ERR
EC_REC_SVO_HEAD_
SERVO
Head Spoke Num
Miscompare-2 - recovered.
SPOKE_NUM_ERR_2
EC_REC_SVO_BURST_
Timeout waiting burst/
Spoke-1 - recovered.
SERVO
TMO
EC_REC_SVO_BURST_
Timeout waiting burst/
Spoke-2 - recovered.
SERVO
TMO_2
EC_REC_SVO_SPINDLE_
SPEED_ERR
Spindle Speed Error -
recovered.
SERVO
EC_REC_SVO_SPINDLE_
SERVO
Spindle Speed Error -
recovered.
SPEED_ERR_2
EC_REC_SVO_POSSIBLE_BU Possible Bump-1st -
0x17
0x17
0x17
0xA0
0xA1
0xA2
SERVO
MP
recovered.
SERVO EC_REC_SVO_BUMP
Bump Err-2nd - recovered.
EC_REC_SVO_DEFECT_
Defective Wdg-1st -
recovered.
SERVO
WEDGE
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SCSI Description
EC_REC_SVO_DEFECT_
WEDGE2
0x17
0x17
0x17
0xA3
0xA4
0xA5
SERVO
SERVO
SERVO
Defective Wdg-2nd - recovered.
Map'd Wdg-1st - recovered.
Map'd Wdg-2nd - recovered.
EC_REC_SVO_MAPPED_WED
GE
EC_REC_SVO_MAPPED_WED
GE2
0x17
0x17
0xA6
0xA7
SERVO EC_REC_SVO_ID_ERR
SERVO EC_REC_SVO_ID_ERR2
Id Err-1st - recovered.
Id Err-2nd - recovered.
EC_REC_SVO_UNKNOWN_WE Unknown Wdg Err-1st -
0x17
0xA8
SERVO
SERVO
DGE_ERR
recovered.
EC_REC_SVO_UNKNOWN_WE Unknown Wdg Err-2nd - recov-
0x17
0x17
0xA9
0xAA
DGE_ERR_2
ered.
SERVO EC_REC_SHOCK_SENSED
Shock detected - recovered.
Recovered data with ecc
on-the-fly.
0x17
0xAF
DER
EC_REC_DATA_WITH_ECC_OT
F
EC_REC_CONFINED_
SYNC_TIMEOUT
Confined sync timeout -
recovered
0x17
0x17
0x17
0x17
0x18
0x18
0x18
0x1C
0x40
0x40
0x41
0xB0
0xB2
0xB3
0xB5
0x00
0x02
0x05
0x00
0x86
0x8C
0x86
SERVO
Context Aquire Timeout - recov-
ered
SERVO EC_REC_CON_ACQ_TIMEOUT
EC_REC_CON_ACQ_DAV_TIM Context Aquire Data Addr Valid
EOUT
0x01
Rec
Error
SERVO
SERVO
DER
T/O - recovered
EC_REC_NOTCH_
TIMEOUT
Notch engine timeout -
recovered
Recovered data with ECC
applied.
EC_REC_DATA_WITH_ECC
EC_REC_DATA_AUTO_
REALLOC
Recovered data - data auto-real-
located.
DER
EC_REC_DATA_REC_
REASS
Recovered data - recommend
reassignment (TA err).
DER
EC_REC_DLST_
NOTFOUND
Requested Defect List Not
Found.
CMD
DER
Controller FIFO over/underflow
error: recovered.
EC_REC_FIFO_ERR
EC_REC_LBA_ERR
LBA mismatch error:
recovered.
DER
Required HW process did not
complete: recovered.
DER
SYS
EC_REC_PRC_OVR
EC_REC_POFAIL
0x42
0x5D
0x00
0x00
Power On or Self Test failed.
Smart trigged
SMART EC_EWS_Tripped
Smart trigged due to Write TA
Factor
0x5D
0x5D
0x01
0x02
SMART EC_EWS_TrippedTAFactor
Smart trigged due to Write Err
Factor
SMART EC_EWS_TrippedErrFactor
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SCSI Description
Smart trigged due to bad block %
free (Compaq)
0x5D
0x5D
0x5D
0x5D
0x14
0x32
0x37
0x38
0x41
0x50
SMART EC_EWS_CBBTable
SMART EC_EWS_CReadError
SMART EC_EWS_CReadErrorTA
SMART EC_EWS_CWriteErrorTA
SMART EC_EWS_CWriteError
SMART EC_EWS_CCSS
Smart trigged due to read errors
(Compaq)
Smart trigged due to TA read
errors (Compaq)
Smart trigged due to TA write
errors (Compaq)
Smart trigged due to write errors
(Compaq)
0x5D
0x01
Smart trigged due to contact start
stop (Compaq)
Rec
Error
0x5D
0x5D
0x5B
0xFF
SMART EC_EWS_TrippedSpinFail
SMART EC_EWS_TestTripped
Smart trigged due to spin retry
Smart test tripped
0x5D
0x80
Block Slow PLL Error:
recovered.
0x10
0x11
0x12
DER
DER
DER
EC_REC_SPLL1_ERR
EC_REC_SPLL2_ERR
EC_REC_BSM_DIS_ERR
Split Slow PLL Error:
recovered.
0x80
0x80
Block state machine disabled:
recovered.
EC_REC_SPOKE_TIME_
ERR
Spoke-to-spoke time error:
recovered.
0x82
0x04
0x04
0x20
0x00
0x01
DER
HDA
EC_NOT_READY
Drive Not Ready
Drive Not Ready, in process of
coming ready
MISC
EC_DRV_RDY_IN_PROGRESS
EC_NEED_START_UNIT_
CMD
Drive Not Ready, use START
cmd
0x04
0x04
0x04
0x02
0x04
0x09
MISC
MISC
MISC
EC_NOT_READY_FORMAT
Drive Not Ready, formatting
Drive Not Ready, self test in
progress
EC_NOT_READY_SLFTST
FileSystem Boot Area unread-
able @ POR.
0x04
0x80
SYS
EC_FSBA_UNREADABLE
Failure to read sector descriptor
file.
0x02
0x04
0x82
0x83
0x84
0x85
0x86
SYS
SYS
SYS
SYS
MISC
EC_FAIL_READ_SDESC
EC_READ_DISKWARE
Not
Ready
0x04
0x04
0x04
0x04
Error reading diskware file.
EC_DISKWARE_NOT_
READY
Diskware not loaded yet - issue
start cmd.
EC_DEAD_VECTOR
Code jumped to Dead Vector.
Drive not ready, config page 8/
HDA mismatched
EC_HDA_NVR_MISMATCH
EC_READ_CONFIGPG_
FILE
0x04
0x88
SYS
Error reading Config Page file.
Drive not ready, selfscan is run-
ning
0x04
0x04
0x91
0x92
MISC
MISC
EC_NOT_READY_SS
EC_NVR_NOTCOMPATIBLE
NVR image not compatible.
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SCSI Description
EC_NOT_READY_
UNKNOWN_LIST
Drive Not Ready, Unknown
defect list.
0x19
0x19
0x01
0x03
SYS
SYS
EC_NOT_READY_BAD_
G_LIST
Drive Not Ready, Bad grown
defect list.
EC_NOT_READY_FMT_
CORP
Drive Not Ready, Format
corrupted.
0x31
0x31
0x40
0x00
0x01
0x80
HDA
HDA
HW
EC_FMT_FAILED_IBM
Format command failed (IBM).
0x02
Not
EC_NOT_READY_
UNKNOWN_HW
Drive Not Ready, Unknown HW
problem.
Ready
Drive Not Ready, NVR is
Corrupt
0x40
0x40
0x40
0x40
0x81
0x83
0x84
0x99
MISC
HW
EC_NVR_ISCORRUPT
EC_NOT_READY_HDA_
DIAG
Drive Not Ready, Failed HDA
test.
EC_NOT_READY_PCB_
DIAG
Drive Not Ready, Failed PCB
test.
HW
ROM and resident code are
incompatible
MISC
EC_ROM_RES_VERSION
0x02
0x03
0x03
0x0C
0x00
0x01
0x84
0x00
DER
DER
EC_NO_SEEK_COMPLETE
EC_PRE_AMP_WUS
No seek complete.
Pre-Amp write unsafe.
DIAG: Write fault.
Write error
RDWR EC_DIAG_WRITE_FAULT
RDWR EC_WRITE_ERR
Write error - auto reallocation
failed.
0x0C
0x02
DER
EC_WR_AUTO_REALLOC_FAIL
Write error - recommend
reassignment.
0x0C
0x11
0x11
0x03
0x00
0x04
DER
DER
DER
EC_WR_ERR_REC_REASS
EC_DATA_ECC
Unrecovered read error.
Unrecovered read error -
auto reallocate failed.
EC_RD_AUTO_REALLOC_FAIL
Read error - recommend
reassignment (TA err).
0x03
Medium
Error
0x11
0x0B
DER
EC_RD_ERR_REC_REASS
EC_DER_RD_PENDING_
REALLOC
Unrecovered read error - pending
reallocation.
0x11
0x11
0x11
0x0C
0x81
0x84
DER
SYS
SYS
EC_FILE_CHKSUM
System file has checksum error.
Error reading Diskware vector tbl
file.
EC_READ_VECTBL
EC_POS_ERR_UNK_
SOURCE
Positioning error detected by
drive, check UPT
0x15
0x15
0x15
0x00
0x02
0x80
DER
DER
DER
Positioning error detected by
read.
EC_POS_ERR
Positioning error detected by
write.
EC_POS_ERR_WRT
0x15
0x15
0x81
0x82
DER
DER
EC_SERVO_WNOK
EC_SERVO_RNOK
Servo Write Not OK.
Servo Read Not OK.
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SCSI Description
0x15
0x16
0x83
0x00
DER
DER
EC_SPK_ADR_ERR
Spoke address error
EC_DATA_SYNC_ERR
Data synchronization mark error.
Spoke synchronization mark
error.
0x16
0x83
DER
EC_SPOKE_SYNC_ERR
0x19
0x19
0x19
0x19
0x19
0x27
0x31
0x31
0x00
0x01
0x03
0x80
0x81
0x00
0x00
0x01
0x00
BBR
SYS
SYS
BBR
BBR
EC_BBR_BAD_MCS
EC_UNKNOWN_LIST
EC_BAD_G_LIST
MCS is invalid.
Unknown defect list.
Bad grown defect list.
Replacement block bad.
Found two bad RBN's.
Write protected.
EC_BBR_BAD_RBN
EC_BBR_RECURSION
RDWR EC_WRITE_PROTECT
HDA
HDA
BBR
EC_FORMAT_CORRUPTED
EC_FMT_FAILED
Format corrupted.
Format command failed.
No available replacement block.
0x03
0x32
EC_BBR_NO_RBN
Medium
Error
Failed replacement I/O
(servo dead?).
0x32
0x41
0x44
0x44
0x01
0x86
0x80
0x81
BBR
DER
SYS
SYS
EC_BBR_IO_FAILED
EC_PRC_OVR
Required HW process did not
complete.
Error writing FileSystem (neg cyl)
file.
EC_WRITE_SYSTEM
EC_READ_SYSTEM
Error reading FileSystem
(neg cyl) file.
0x80
0x80
0x80
0x00
0x10
0x11
DER
DER
DER
EC_FRC_ERR
EC_SPLL1_ERR
EC_SPLL2_ERR
Forced error.
Block Slow PLL Error.
Split SLow PLL Error.
Block state machine disabled
error
0x80
0x82
0x02
0x03
0x06
0x12
0x20
0x00
0x00
0x80
DER
DER
EC_BSM_DIS_ERR
EC_SPOKE_TIME_ERR
Spoke-to-spoke time error
EC_HARD_NO_SEEK_
COMPLETE
DER
No seek complete.
DER
EC_HARD_WRITE_FAULT
Write fault.
EC_RCL_PES_PARAM_
BAD
RECAL
PES calibration results are bad.
EC_RCL_BIAS_PARAM_
BAD
0x04
Hdwe
Error
0x06
0x81
RECAL
RECAL
BIAS calibration results are bad.
EC_RCL_GAMMA_
PARAM_BAD1
ID GAMMA calibration values out
of range.
0x06
0x06
0x06
0x06
0x82
0x83
0x84
0x85
RECAL EC_RCL_REC_TMOUT
Recal record timeout.
Seek fail during feed forward
scale Cal.
RECAL EC_RCL_SK_FFG
RECAL EC_RCL_GRAB_FAILED
Initial track grab failed.
5-144
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SCSI Description
Seek failure during Bias
Calibration.
0x06
0x06
0x86
0x87
RECAL EC_RCL_SK_BIAS
RECAL EC_RCL_SK_KTJ
Seek failure during KT/J
Calibration.
Seek failure during PES
Calibration.
0x06
0x06
0x06
0x88
0x89
0x8A
RECAL EC_RCL_SK_PES
RECAL EC_RCL_SVO_NOT_RDY
Recal servo not ready.
EC_RCL_SW_POINT_
RECAL
Switch Point calibration results
are bad.
PARAM_BAD
EC_RCL_TRACK_NUM_
0x06
0x06
0x06
0x06
0x06
0x8B
0x8C
0x8D
0x8E
0x8F
RECAL
BAD
Recal track number bad.
EC_RCL_SK_SWITCH_
Seek failure during switch point
cal.
RECAL
POINT
Not all Head(s) in USER head
map were found alive
RECAL EC_RECAL_MAP_HEADS
EC_RCL_NO_SAMS_
RECAL
FOUND
Valid SAMs not found !!!
EC_RCL_SYNC_2_SPOKE_FAI
RECAL
L
Sync To Disk Spokes failed.
0x06
0x06
0x06
0x90
0x91
0x92
RECAL EC_RCL_INVALID_CP18
RECAL EC_RCL_INVALID_CP21
RECAL EC_RCL_INVALID_CP22
Invalid CP18 on disk.
Invalid CP21 on disk.
Invalid CP22 in NVR.
0x04
Hdwe
Error
EC_RCL_HEAD_POLARITY_FA
0x06
0x06
0x06
0x06
0x06
0x06
0x06
0x06
0x06
0x06
0x06
0x93
0x94
0x95
0x96
0x97
0x98
0x99
0x9A
0x9B
0x9C
0x9D
RECAL
IL
Head polarity cal failed.
EC_RCL_CP22_HEAD_
POLARITY
Invalid head polarity vector in
CP22.
RECAL
EC_RCL_ERASE_BAND_
Seek 1 failure during servo writer
erase band resync.
RECAL
SK1
Seek failure during ARCs
Calibration.
RECAL EC_RCL_SK_ARC
Seek failure during Pes
Linearization.
RECAL EC_RCL_SK_PESLIN
RECAL EC_RCL_PESLIN_BODE
Error during Pes Lin bode mea-
surement.
EC_RCL_ERASE_BAND_
Seek 2 failure during servo writer
erase band resync.
RECAL
SK2
EC_RCL_PESLIN_TABL_
UPDATE
Seek failure during pes
linearization table update.
RECAL
EC_RCL_TURBO_SPIN_
RECOVERY
Motor speed error after turbo
spin recovery.
RECAL
EC_RCL_BAD_ELEC_OFFSET Electrical offset calibration
_VAL returned an invalid value.
EC_RCL_HEAD_POLARITY_DE Went servo dead during head
RECAL
RECAL
AD
polarity/coarse ATT cal.
Maxtor Atlas 10K III
5-145
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SCSI Description
Data consistency failure during
PES Linearization
0x06
0x06
0x06
0x06
0x06
0x06
0x06
0x09
0x9E
0x9F
0xA0
0xA1
0xA2
0xA3
0xA4
0x00
RECAL EC_RCL_FAIL_IN_PESLIN
EC_RCL_ERASE_BAND_
NOSYNC
Couldn't find sync in the erase
band & couldn't restart servo.
RECAL
EC_RCL_ERASE_BAND_
SERVODEAD
Went servo dead after
completing a seek.
RECAL
EC_RCL_ERASEBAND
RECAL
Successful sync not in the erase
band.
SYNCINVALID
EC_RCL_GAMMA_PARAM_BA ID GAMMA projected value out of
D2 range.
EC_RCL_GAMMA_PARAM_BA OD GAMMA calibration
D3 values out of range.
EC_RCL_GAMMA_PARAM_BA OD GAMMA projected value out
RECAL
RECAL
RECAL
DER
D4
of range.
EC_HARD_TRK_
FOLLOW_ERR
Track following error.
0x09
0x09
0x09
0x09
0x90
0x91
0x92
0x93
0x94
SERVO EC_SVO_NO_ERROR
SERVO EC_SVO_TA_ERR
Svo:No Err.
Svo:TA Err-1st.
Svo:TA Err-2nd.
Svo:Bad Sync-1st.
Svo:Bad Sync-2nd.
SERVO EC_SVO_TA_ERR_2
SERVO EC_SVO_BAD_SYNC
SERVO EC_SVO_BAD_SYNC_2
0x09
0x04
Hdwe
0x09
Error
EC_SVO_GREY_QUALITY_ER Svo:Grey Code Quality
Err-1st.
EC_SVO_GREY_QUALITY_ER Svo:Grey Code Quaility
0x95
0x96
0x97
0x98
0x99
0x9a
0x9b
0x9c
SERVO
SERVO
SERVO
SERVO
R
0x09
R_2
Err-2nd.
EC_SVO_HEAD_SPOKE_
NUM_ERR
Svo:Head Spoke Number Mis-
compare-1st.
0x09
0x09
0x09
0x09
0x09
0x09
EC_SVO_HEAD_SPOKE_
NUM_ERR_2
Svo:Head Spoke Number Mis-
compare-2nd.
Svo:Timeout waiting for burst/
Spoke-1st.
SERVO EC_SVO_BURST_TMO
SERVO EC_SVO_BURST_TMO_2
Svo:Timeout waiting for burst/
Spoke-2nd.
EC_SVO_SPINDLE_SPEED_ER
SERVO
R
Svo:Not spinning at proper speed
EC_SVO_SPINDLE_SPEED_ER Svo:Not spinning at proper
SERVO
SERVO
R_2
speed-2nd
EC_SVO_POSSIBLE_
BUMP
0x09
0x09
0x09
0xA0
0xA1
0xA2
Svo:Possible Bump-1st.
Svo:Bump Err-2nd.
Svo:Defective Wdg-1st.
SERVO EC_SVO_BUMP
EC_SVO_DEFECT_
SERVO
WEDGE
EC_SVO_DEFECT_
WEDGE2
0x09
0xA3
SERVO
Svo:Defective Wdg-2nd.
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SCSI Description
EC_SVO_MAPPED_
WEDGE
0x09
0x09
0xA4
0xA5
SERVO
SERVO
Svo:Map'd Wdg-1st.
EC_SVO_MAPPED_
WEDGE2
Svo:Map'd Wdg-2nd.
0x09
0x09
0xA6
0xA7
SERVO EC_SVO_ID_ERR
SERVO EC_SVO_ID_ERR2
Svo:Id Err-1st.
Svo:Id Err-2nd.
EC_SVO_UNKNOWN_
SERVO
0x09
0x09
0xA8
0xA9
Svo:Unknown Wdg Err-1st.
Svo:Unknown Wdg Err-2nd.
WEDGE_ERR
EC_SVO_UNKNOWN_
SERVO
WEDGE_ERR_2
0x09
0x09
0xAA
0xAB
SERVO EC_SHOCK_SENSED
SERVO EC_SVO_SEEK_TMO
Svo:Shock detected.
Svo:Seek time out
EC_CONFINED_SYNC_
TIMEOUT
0x09
0xB0
SERVO
Svo:Confined sync timeout.
0x09
0x09
0xB1
0xB2
SERVO EC_RW_SERIAL_TIMEOUT
SERVO EC_CON_ACQ_TIMEOUT
Svo:R/W serial timeout.
Svo:Context Aquire Timeout.
EC_CON_ACQ_DAV_
TIMEOUT
Svo:Context Aquire Data Addr
Valid Timeout.
0x09
0x09
0xB3
0xB4
SERVO
EC_CON_ACQ_BAD_
TRK_NUM
Svo:Context Aquire Bad Trk
Number.
SERVO
0x04
Hdwe
Error
0x09
0x15
0xB5
0x00
SERVO EC_NOTCH_TIMEOUT
Svo:Notch engine timeout
Random positioning error.
DER
DER
BBR
BBR
EC_HARD_RND_POS_ERR
Positioning error detected by
read.
0x15
0x32
0x32
0x02
0x00
0x80
EC_HARD_POS_ERR
EC_BBR_ALIST_FULL
EC_BBR_REPLACE_FAIL
A-list is full.
Replacement failed
(table full?)
0x3E
0x3E
0x40
0x03
0x04
0x80
HW
HW
HW
EC_SLFTST_FAIL
Logical Unit failed self test
Logical unit log update failure.
Unknown HW problem.
EC_SLFTSTLOG_FAIL
EC_UNKNOWN_HW
Hardware Bug Check
(check Info field)
0x40
0x82
MISC
EC_DIAG_FAILURE
0x40
0x40
0x40
0x83
0x84
0x85
HW
HW
HW
EC_HDA_DIAG
EC_PCB_DIAG
EC_EDC_ERR
Failed HDA test.
Failed PCB test.
EDC check failed.
Controller FIFO over/underflow
error.
0x40
0x40
0x40
0x86
0x87
0x88
DER
HW
HW
EC_FIFO_ERR
EC_EDC_ERR_IBM
EC_SVO_WTR_DATA
EDC check failed (IBM).
DIAG: Drive failed to read
servowriter serial number.
0x40
0x40
0x89
0x8A
HW
HW
EC_XOR_FAIL
EC_SE_FAIL
DIAG: Failed XOR test.
DIAG: Failed Servo Engine test.
Maxtor Atlas 10K III
5-147
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SCSI Description
0x40
0x40
0x8C
0x8D
DER
HW
EC_LBA_ERR
LBA mismatch error.
ETM test failure, drive failed to
spin.
EC_ETM_FAILURE
EC_TARGET_RPM_
FAILURE
0x40
0x40
0x40
0x40
0x8E
0xA0
0xA1
0xA2
HW
Could not achieve target RPM.
Test did not complete.
SVOT
SVOT
SVOT
EC_SVOT_FAIL_INCMP
Test completed successfully, but
failed.
EC_SVOT_FAIL_CMP
EC_SVOT_INVALID_PARM
Invalid parameter was received.
Invalid data in servo record. Pre-
vented algorithm from complet-
ing.
EC_SVOT_INVALID_
RECORD_DATA
0x40
0xA3
SVOT
EC_SVOT_RECORD_
TIMEOUT
0x40
0x40
0xA4
0xA5
0xA6
0xA7
0xA8
0xA9
0xAA
0xAB
0xAC
0xAD
0x00
0x84
0x01
SVOT
SVOT
SVOT
SVOT
SVOT
SVOT
SVOT
SVOT
AVAIL
AVAIL
SYS
Servo record did not complete
Read seek failed.
EC_SVOT_READ_SEEK_
FAILED
EC_SVOT_WRITE_SEEK_
FAILED
0x40
0x04
Write seek failed.
EC_SVOT_RAW_SEEK_
FAILED
Hdwe
Error
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x44
0x44
0x90
Raw seek failed.
EC_SVOT_SVO_TEST_
RUNNING
Servo Diagnostic Test running.
EC_SVOT_INVALID_97_
98_SEQ
Invalid 97/98 super cmd seq.
Must send 97 before 98
EC_SVOT_CMD_97_
RUNNING
Super Command 97 already run-
ning.
EC_SVOT_CMPLX_MAG_
IS_0
Complex magnitude is zero.
EC_SVOT_BCV_WRITE_
FAILURE
Could not complete the
low-level bcv write function
EC_SVOT_CMPLX_DIV_
BY_0
Got a divide by zero error in com-
plex divide.
Logical assertion (firmware con-
sistency check)
EC_ASSERT_ERROR
EC_INSUF_BUF
Insufficient buffer memory for
operation
SYS
EC_SERIAL_RECEIVE_
ERROR
SER
Serial Port Packet Receive Error.
5-148
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SCSI Description
0x1A
0x20
0x00
0x00
SCSI
CMD
EC_PARAMETER_OVR
EC_INV_COMMAND
Parameter list length error.
Invalid command.
ETM can't run with motor
spinning
0x20
0xFE
SCSI
EC_INV_ETM_CMD
0x20
0x21
0x24
0x25
0x26
0x26
0xFF
0x00
0x00
0x00
0x00
0x02
MISC
CMD
CMD
CMD
CMD
CMD
EC_SS_CODE_BAD
EC_INV_LBA
Selfscan code not loaded or bad
Invalid LBA.
EC_INV_CDB
Invalid bits set in CDB.
Invalid LUN specified.
Invalid fields in parameters.
Bad fields in parameters.
EC_INV_LUN
0x05
Illegal
Request
EC_INV_PARAMETER
EC_BAD_PARAMETER
Invalid release of persistent res-
ervation
0x26
0x26
0x04
0x80
CMD
CMD
EC_INV_PERRESREL
EC_BAD_CODE_IMAGE
Invalid Code image checksum
failed.
0x26
0x2C
0x81
0x00
CMD
CMD
EC_INV_PRODUCT_CODE
EC_INV_CMD_SEQ
Incorrect product code loaded
Invalid command sequence.
Invalid bit set in identify
message
0x3D
0x00
SCSI
EC_INV_ID_MSG
Maxtor Atlas 10K III
5-149
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SCSI Description
0x0B
0x28
0x29
0x29
0x29
0x29
0x01
0x00
0x01
0x02
0x03
0x04
SMART EC_EWS_UTrippedThermal
SMART overtemperature trip
Not Ready to Ready transition
Power-On-Reset occurred.
SCSI bus reset occurred.
Bus device reset message.
Recovered from bug check
SCSI
SCSI
SCSI
SCSI
MISC
EC_NRDY_2_RDY
EC_RESET_OCCURRED
EC_RESET_SCSI_BUS
EC_RESET_BUS_DEV
EC_BUG_CHECK
Bus mode changed to single
ended.
0x29
0x05
SCSI
EC_RESET_SINGLE_END
0x29
0x29
0x2A
0x2A
0x06
0x86
0x01
0x02
SCSI
SCSI
SCSI
SCSI
EC_RESET_LVDS
Bus mode changed to LVDS.
Reset after too many ACK's
Mode parameters were changed.
Log parameters were changed.
EC_RESET_AFTER_OVRN
EC_MODE_CHANGED
EC_LOG_CHANGED
Persistent Reservations were
cleared.
0x2A
0x06
Unit
Attn
0x03
0x04
0x00
SCSI
SCSI
SCSI
EC_RES_PREEMPT
EC_RES_RELEASED
EC_CLEARED_CMNDS
Persistent Reservations were
released.
0x2A
Cmd Queue cleared by another
initiator.
0x2f
0x3f
0x3f
0x01
0x05
0x01
0x02
0x00
SCSI
SCSI
SCSI
SCSI
EC_CODE_LOAD
Microcode has been changed
Device Identifier changed
Spindle synced
EC_DEV_ID_CHANGED
EC_RPL_SYNCD
0x5C
0x5C
0x5D
EC_RPL_NOT_SYNCD
Spindle not synced
SMART EC_EWS_UTripped
Smart triggered
Smart triggered due to Write TA
Factor
0x5D
0x5D
0x5D
0x5D
0x5D
0x5D
0x5D
0x5D
0x01
0x02
0x14
0x32
0x37
0x38
0x41
0x50
SMART EC_EWS_UTrippedTAFactor
Smart triggered due to Write Err
Factor
SMART EC_EWS_UTrippedErrFactor
SMART EC_EWS_UCBBTable
Smart triggered due to bad block
% free (Compaq)
Smart triggered due to read
errors (Compaq)
SMART EC_EWS_UCReadError
SMART EC_EWS_UCReadErrorTA
SMART EC_EWS_UCWriteErrorTA
SMART EC_EWS_UCWriteError
Smart triggered due to TA read
errors (Compaq)
Smart triggered due to TA write
errors (Compaq)
Smart triggered due to write
errors (Compaq)
0x06
Unit
Attn
Smart trigged due to contact
start stop (Compaq)
SMART EC_EWS_UCCSS
0x5D
0x5D
0x5D
0x5B
0x80
0xFF
SMART EC_EWS_UTrippedSpinFail
Smart trigged due to spin retry
Smart test tripped
MISC
EC_TRIP_ECCOTF
SMART EC_EWS_UTestTripped
Smart test tripped
5-150
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SCSI Description
0x07
Data
Protect
0x27
0x00
0x00
RDWR
SCSI
EC_DATA_WR_PROTECT
EC_OVRLAP_DF_WE
Data write protected.
0x09
Vendor 0x81
Specific
New command overlaps deferred
write error.
0x00
0x1B
0x25
0x3F
0x00
0x00
0x00
0x0F
SCSI
SCSI
SCSI
SCSI
EC_ABORT
Aborted.
Abort: Synchronous transfers
timeout
EC_ABORT_STTO
EC_ABORT_INV_LUN
EC_BUFF_NOT_VALID
Aborted with invalid LUN
Aborted: Echo buffer
overwritten
0x43
0x45
0x00
0x00
0x00
0x01
SCSI
SCSI
SCSI
SCSI
EC_MSG_REJECT
EC_RESEL_FAIL
EC_SCSI_PARITY
EC_pCRC_ERROR
Abort: Message reject error.
Abort: Reselection failed.
Abort: Bus parity error.
0x47
0x47
0x0B
Aborted
Cmd
Abort: pCRC error detected.
Abort: Bus parity error during ST
data phase.
0x47
0x47
0x02
0x03
SCSI
SCSI
EC_SCSI_PARITY_DATA
EC_IU_CRC_ERROR
Abort: Information Unit CRC
error.
0x47
0x48
0x49
0x04
0x00
0x00
SCSI
SCSI
SCSI
EC_SCSI_AIP
Abort: Async Protection error.
Abort: Initiator detected error.
Aborted with invalid Message.
EC_INIT_DET_ERR
EC_ABORT_INV_MSG
Overlapped commands
attempted.
0x4E
0x1D
0x00
0x00
SCSI
DER
EC_ACTIVE_SELECT
0x0E
EC_DATA_MISCOMPARE
Data miscompare error.
Maxtor Atlas 10K III
5-151
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SCSI Description
Sense-Key Specific Field Contents
Field pointer
bytes
ILLEGAL
REQUEST
Illegal field's offset (in the Com m and Descriptor Block or
data-out buffer transfer param eters).
Progress Indi-
cation
NOT READY
Indicates progress of FORMAT UNIT Com m and.
RECOV-
ERED
Retry count
Num ber of retries for I/O operation
Num ber of retries for I/O operation
ERROR
MEDIUM
ERROR
Retry count
The data format of the Field Pointer bytes associated with the ILLEGAL R EQUEST
ILLEGAL REQUEST Sense Key Field Pointer Bytes\Data Format
15
SKSV
= 1
C/D
Reserved
BPV
Bit Pointer
16 -
17
Field Pointer
5-152
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SCSI Description
ILLEGAL REQUEST Sense Key Field Pointer Bytes\Field Descriptions
SKSV
C/D
Sense-Key Specific Valid
Com m and/Data. When the value in this field is 1, the Field Pointer iden-
tifies the first byte in error in the Com m and Descriptor Block.
When 0, the Field Pointer identifies the first byte in error in the data pa-
ram eters sent by the initiator in the data-out buffer transfer.
BPV
Bit Pointer Valid. The drive does not support Bit-level resolution; the bit
value m ust be 0.
Bit Pointer
The drive does not support Bit-level resolution; the bit value m ust be 0.
Field Pointer
Indicates the first byte in error in either the Com m and Descriptor Block
or in the data param eters sent by the initiator.
The data format of the Progress Indication bytes associated with the NOT R EADY
NOT READY Sense Key - Progress Indication Bytes\Data Format
15
SKSV
Reserved
= 1
16 -
17
Progress Indication
NOT READY Sense Key - Progress Indication Bytes\Field Descriptions
SKSV
Progress Indication
Sense-Key Specific Valid
Indication of percent com plete for the FORMAT UNIT com m and.
The returned value is the num erator of a fraction that has 65536
(10000h) as the denom inator (Progress Indication/10000h = per-
cent com plete).
The data format of the R etry Count bytes associated with the MEDIUM ER R OR
MEDIUM ERROR or RECOVERED ERROR Sense Key - Retry Count-Data Format
15
SKSV
= 1
Reserved
Retry Count
16 -
17
Maxtor Atlas 10K III
5-153
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SCSI Description
The R ESERVE and the R ELEASE commands are used for contention resolution in
multiple-initiator systems. The R ESERVE command is used to reserve a logical unit.
RESERVE (6) Command Descriptor Block-Data Format
0
1
Operation Code (16h)
Reserved
3rdPty
Third Party Device ID
Extent
2
Reservation Identification
Extent List Length
Control
3 - 4
5
RESERVE (6) Command-Field Descriptions
3rd Pty
When set to 1, it indicates that the Third Party Device ID field is valid.
Required and used only when the 3rdPty bit is set, in which case this field specifies the
SCSI ID (0 through 7 only) of the initiator to be granted the reservation of the logical unit.
The drive preserves the reservation until one of the following occurs:
• It is superseded by another valid RESERVE com m and from the initiator.
• It is released by the sam e initiator
• It is released by a TARGET RESET m essage from any initiator.
• It is released by a hard reset condition.
Third
Party
Device ID
The drive ignores any attem pt to release the reservation m ade by any other initiator. For
exam ple, if ID7 sends ID2 a Third Party reservation on behalf of ID6 (the target at ID2
gets reserved for the initiator ID6), then only ID7 can release the target at ID2 (using a
Third Party release). ID6 cannot release the reservation even though the reservation was
m ade on its behalf.
Extent
The drive supports reservations only on entire logical units. The value m ust be 0.
Reserva-
tion Iden- Any value in this field is ignored by the drive.
tification
Extent
List
Any value in this field is ignored by the drive.
Length
The drive returns R ESER VATION CONFLICT status if the unit is already
reserved for another initiator. Once the reservation is honored, any command
from another initiator (except INQUIR Y or R EQUEST SENSE) is rejected
with R ESERVATION CONFLICT status.
Maxtor Atlas 10K III
5-155
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SCSI Description
The R ESERVE and the R ELEASE commands are used for contention resolution in
multiple-initiator systems. The R ESERVE command is used to reserve a logical unit.
If RESER VE (10) is used, then RELEASE (10) is also used. The data format and the
RESERVE (10) Command Descriptor Block-Data Format
0
Operation Code (56h)
1
2
3
Reserved
3rdPty
Reserved
LongID
Extent
Reservation Identification
Third Party Device ID
Reserved
4 - 6
7 - 8
9
(MSB)
Param eter List Length
Control
(LSB)
RESERVE (10) Command-Field Descriptions
3rd Pty
When set to 1, it indicates that the Third Party Device ID field is valid.
When 0, indicates that the third party device associated with the reservation release
has a num ber sm aller than 255 and the ID value can be sent within the CDB. If set
= 1, indicates that the third party device ID is greater than 255, the ID value within
the CDB is ignored, and the param eter list length is at least eight.
LongID
Required and used only when the 3rdPty bit is set, in which case this field specifies
the SCSI ID of the initiator to be granted the reservation of the logical unit. The drive
preserves the reservation until one of the following occurs:
• It is superseded by another valid RESERVE com m and from the initiator.
• It is released by the sam e initiator.
• It is released by a TARGET RESET m essage from any initiator.
• It is released by a hard reset condition.
Third Party
Device ID
The drive ignores any attem pt to release the reservation m ade by any other initiator.
For exam ple, if ID7 sends ID2 a Third Party reservation on behalf of ID6 (the target
at ID2 gets reserved for the initiator ID6), then only ID7 can release the target at ID2
(using a Third Party release). ID6 cannot release the reservation even though the res-
ervation was m ade on its behalf.
If 0, requests that the entire logical unit be reserved for use only by the initiator until
the request is supplanted by another valid RESERVE com m and from the sam e initia-
tor, or until released via a RELEASE (10) com m and from the reserving initiator, a hard
reset, or a power on cycle.
If set = 1, the extent reservation option is im plem ented. This option allows an ap-
plication client in a m ultitasking environm ent to have m ultiple reservations.
Extent
The size of the extent list is defined by the contents of the Param eter List Length
field. The extent list consists of zero or m ore descriptors. Each descriptor defines an
extent beginning at the specified logical block address for the specified num ber of
blocks. If the num ber of blocks is 0, the extent begins at the specified logical block
address and continues through the last logical block address on the logical unit. The
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SCSI Description
Extent Descriptors-Data Format
0
Reserved
RelAdr
Reservation Type
(LSB)
(MSB)
(MSB)
1 - 3
Num ber of Blocks
4 - 7
Logical Block Address
(LSB)
The R eservation Type field defines the type of reservation in effect for the extent
Reservation Types
READ shared. No write operations are perm itted by any initiator
to the reserved extent. Any initiator m ay read from the extent.
00b
WRITE exclusive. No other initiator m ay write to the indicated
extent. Any initiator m ay read from the extent.
01b
READ exclusive. While this reservation is active, no other initia-
tor m ay be perm itted to read to the indicated extent.
10b
Exclusive access. While this reservation is active, no other initi-
ator is perm itted any access to the reserved extent.
11b
R elAdr is always 0: The Maxtor Atlas 10K III hard disk drive does not support relative
addressing.
If both the LongID and the Extent bits = 1, then the parameter list takes the format
Parameter List When LongID and Extent Bits = 1-Data Format
(MSB)
0 - 7
8 - n
Third Party Device ID
(LSB)
(MSB)
Extent Descriptors
(See Figure 5-91 Above)(LSB)
If the LongID bit = 1 and the Extent bit = 0, then the parameter list length is eight
RESERVE (10) ID Only Parameter List-Data Format
(MSB)
0 - 7
Third Party Device ID
(LSB)
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SCSI Description
The REZERO UNIT command sends the heads to cylinder 0 (Logical Block Address
0). Once the heads are on the track, they are not guaranteed to stay at cylinder 0;
periodic calibrations may send them to a different cylinder. If periodic calibrations
have been disabled by using the MAN bit (byte 3, bit 6) of the Vendor Unique
Function Control Page in the MODE SELECT command (15h), the R EZERO
UNIT command will cause the drive to perform the next scheduled calibration. The
REZERO UNIT Command Descriptor Block-Data Format
0
Operation Code (01h)
Reserved
1 - 4
5
Control
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SCSI Description
The SEEK (6) command uses a 6-byte Command Descriptor Block to request the
drive to send the drive heads to the requested Logical Block Address. The drive
responds by placing the heads at the correct Logical Block Address. When the heads
are at the specified Logical Block Address, they are not guaranteed to stay in that
position since periodic calibrations may send them to a different cylinder. The data
SEEK (6) Command Descriptor Block-Data Format
0
1
Operation Code (0Bh)
Reserved
Logical Block Address
Logical Block Address
2 - 3
4
Reserved
Control
5
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SCSI Description
The SEEK (10) command uses a 10-byte Command Descriptor Block to request the
drive to send the drive heads to the requested Logical Block Address. The drive
responds by placing the heads at the correct Logical Block Address. When the heads
are at the specified Logical Block Address, they are not guaranteed to stay in that
position since periodic calibrations may send them to a different cylinder. The data
SEEK (10) Command Descriptor Block-Data Format
0
Operation Code (2Bh)
Reserved
1
2 - 5
6 - 8
9
Logical Block Address
Reserved
Control
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SCSI Description
The SEND DIAGNOSTIC command sends a diagnostic page to the drive. R efer to
the R ECEIVE DIAGNOSTICS R ESULTS command for a description of the
diagnostic pages and the use of the diagnostic commands. The Supported Diagnostic
SEND DIAGNOSTIC Command Descriptor Block-Data Format
0
Operation Code (1Dh)
PF Rsvd
Reserved
Self
Test
1
Function
DevOnl UnitOfl
2
3 - 4
5
Param eter List Length
Control
SEND DIAGNOSTIC Command-Field Descriptions
When the SelfTest bit is set to one, the Function code field is 000b. When the Self-
Test bit is cleared to zero, the content of the Function code field is specified as fol-
lows:
000b: Value to be used when the SelfTest bit is set to one or if the SEND DIAGNOS-
TIC com m and is not invoking one of the other self-test function codes (for exam ple,
Translate Address page)
001b: Background short self-test. The device server will start its short self-test rou-
tine in the background m ode.
010b: Background extended self test. The device server will start its extended self-
test routine in the background m ode.
011b: Reserved
Function
100b: Abort background self-test. Abort the current self-test running in background
m ode. This value is only valid if a previous SEND DIAGNOSTIC com m and specified
a Background self-test function and that function has not com pleted. If either of
these conditions is not true, then the device server will respond by returning a
CHECK CONDITION with a sense key of NOT READY and an additional sense code
of LOGICAL UNIT NOT READY, SELF-TEST IN PROGRESS.
101b: Foreground short self-test. The device server will start its short self-test rou-
tine in the foreground m ode
110b: Foreground extended self-test. The device server will start its extended self-
test routine in the foreground m ode
111b: Reserved
Page Form at. When the PF bit is 1, the param eters that follow conform to the Sup-
PF
SelfTest is ignored when PF = 1.
The PF bit m ust be 1 if Param eter List Length is not 0.
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SCSI Description
If the PF bit is 0 and the SelfTest bit is 1, the drive runs its self-test routine. GOOD
status is returned to the initiator if the self-test passes. CHECK CONDITION status
is returned along with any available sense data if the self-test fails.
SelfTest
This field is ignored if the PF bit is 1.
DevOnl
UnitOfl
Any value in this field is ignored by the drive.
Any value in this field is ignored by the drive.
When the Param eter List Length field is non-zero, the value specifies the length (in
bytes) of the param eter list that is to be transferred from the initiator to the drive
during the com m and's data-out buffer transfer.
Param eter List
Length
This field is only valid when the PF bit = 1 and m ust be 0 when the PF bit is 0.
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SCSI Description
SEND DIAGNOSTIC command to request that the Supported Diagnostic Page List
be returned after the next RECEIVE DIAGNOSTIC R ESULTS command.
Supported Diagnostic Page List-Data Format
0
Page Code (00h)
Reserved
1
2 - 3
Page Length (00h)
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SCSI Description
DIAGNOSTIC command to request that the Translate Address Page be returned after
the next RECEIVE DIAGNOSTIC R ESULTS command.
Translate Address Page-Data Format
0
Page Code (40h)
Reserved
1
2 - 3
4
Page Length (0Ah)
Supplied Form at
000b (LBA)
Reserved
Reserved
5
Translate Form at
101b (Physical Sector)
6 - 9
Address to Translate
(LBA Form at)
10 -
13
Reserved
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SCSI Description
The SET DEVICE IDENTIFIER command requests that the device identifier
information in the logical unit be set to the value send via the SET DEVICE
IDENTIFIER command’s parameter list. The data format and field descriptions are
Upon successful completion of a SET DEVICE IDENTIFIER command, a Unit
Attention is generated for all initiators except the one that issued the command.
SET DEVICE IDENTIFIER Command Descriptor Block-Data Format
0
1
Operation Code (A4h)
Reserved
Service Action (06h)
2 – 5
Reserved
(MSB)
6 – 9
Param eter List Length
(LSB)
10
11
Reserved
Control
SET DEVICE IDENTIFIER Command Descriptor Block-Field Descriptions
Service Action
. Any other value forces Check Condition, Illegal Request.
This field specifies the length, in bytes, of the Identifier to be transferred
from the application client to the device server. The m axim um value for
this field is 64 bytes. A param eter list length of 0 indicates that no data
will be transferred, and that subsequent REPORT DEVICE IDENTIFIER
com m ands will return an Identifier length of 0. If the param eter list length
exceeds 64 bytes, then the drive returns a Check Condition status with
the sense key set to Illegal Request, and an additional sense code of In-
valid Field in CDB.
Param eter List Length
The SET DEVICE IDENTIFIER command’s parameter list contains Identifier to be
set by the logical unit to which the command is sent. The parameter list is shown
SET DEVICE IDENTIFIER Parameter List-Data Format
(MSB)
0 – n
Identifier
(LSB)
SET DEVICE IDENTIFIER Parameter List-Field Descriptions
The value reported in this field is the data to be returned by all
subsequent REPORTDEVICEIDENTIFIERcom m ands, untila new
SET DEVICE IDENTIFIER com m and is issued that changes the
data.
Identifier
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SCSI Description
The STAR T STOP UNIT command enables or disables the logical unit for media
access operations. This command gives the initiator remote control over drive spin-
up and spin-down. The data format and field descriptions are shown in Table 5-205
A jumper (or backplane connection) is used to select the spin-up mode. When
configured for remote control of spin-up (Option 3), the drive requires a STAR T
STOP UNIT Command to spin up. See Chapter 3 for jumper-programming
instructions for your specific hard disk drive.
START STOP UNIT Command Descriptor Block-Data Format
0
Operation Code (1Bh)
Reserved
1
Im m ed
Start
2 - 3
Reserved
4
5
Power Conditions
Reserved
LoEj
Control
START STOP UNIT Command-Field Descriptions
Im m ediate. When 1, the drive returns GOOD status im m ediately after validat-
ing the Com m and Descriptor Block, but before the drive spins up.
Im m ed
LoEj
When 0, the drive does not return GOOD status until after the drive has spun
up successfully and is ready for m edia access com m ands.
Load Eject. This value m ust be zero, because the disk drive contains non-re-
m ovable m edium .
When Start is 1, the unit spins up (if it is not currently spinning) and is left
in a state where subsequent m edia access com m ands can succeed.
Start
When the value is 0, the drive spins down. Subsequent m edia access com -
m ands are rejected with CHECK CONDITION status and the proper sense da-
ta.
Power
Conditions
The Power Conditions field is not supported.
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SCSI Description
The SYNCHRONIZE CACHE command ensures that all logical blocks, within the
specified range in the drive's cache memory, have their most recent data value
recorded on the physical medium. If more recent data for a logical block, within the
specified range, exists in the cache memory than on the physical medium, then the
logical blocks from the cache memory is written to the physical medium. Logical
blocks are not necessarily removed from the cache as a result of the Synchronize Cache
5-208 respectively.
SYNCHRONIZE CACHE Command Descriptor Block-Data Format
0
1
Operation Code (35h)
Reserved
Im m ed
= 0
RelAdr
2 - 5
6
Logical Block Address
Reserved
Num ber of Blocks
Control
7 - 8
9
SYNCHRONIZE CACHE Command-Field Descriptions
Im m ediate. Must be 0. The drive returns status after the synchronize cache
operation has been com pleted.
Im m ed
RelAdr
Relative Address. Must be 0. Relative addressing is not supported.
Logical
Block Ad-
dress
The address of the first logical sector of the range to be operated upon by
this com m and.
Specifies the total num ber of contiguous logical blocks within the range.
When set to 0, the drive rem oves all sectors from the given Logical Block Ad-
dress on.
Num ber of
Blocks
When Num ber of Blocks and Logical Block Address are both 0, the drive re-
m oves all unwritten cache sectors to the m edium .
It is not considered an error when no sectors within the specified range are
in the cache m em ory.
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SCSI Description
The TEST UNIT READY command returns GOOD status if the drive is ready to
receive medium access commands (that is, R EAD, WR ITE, VER IFY, etc.). If the
drive is not ready to receive medium access commands, it returns CHECK
CONDITION status with the appropriate sense keys and qualifiers. The data format
TEST UNIT READY Command Descriptor Block-Data Format
0
Operation Code (00h)
Reserved
1 - 4
5
Control
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SCSI Description
The VERIFY command verifies the data on the medium for the Logical Block
VERIFY Command Descriptor Block-Data Format
0
Operation Code (2Fh)
1
2 - 5
6
Reserved
DPO
Reserved
BytChk
RelAdr
Logical Block Address
Reserved
7 - 8
9
Verification Length
Control
VERIFY Command-Field Descriptions
Disable Page Out. When the value of the field = 1, the device server will assign
the logical blocks accessed by this com m and the lowest priority for being
fetched into or retained by the cache.
DPO
When DPO = 0, the priority will be determ ined by fields in the Caching page.
Byte Check. When the value is 1, the drive perform s a byte-by-byte com parison
of the data on the m edium with the data sent by the initiator in the data-out buff-
er transfer.
BytChk
RelAdr
When 0, the drive perform s a m edium verification with no data com parison. In
this case, no data is sent by the initiator.
Relative Address. This feature is not supported;
Logical
Block
Address
The address of the first logical sector to be verified.
Verifica-
tion
Length
The num ber of contiguous sectors that are to be verified. The drive returns a
CHECK CONDITION status with the correct sense data if the specified transfer
extends beyond out of the logical sector space.
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SCSI Description
The WR ITE (6) command requests that the drive write initiator-supplied data to the
medium.
WRITE (6) Command Descriptor Block-Data Format
0
Operation Code (0Ah)
Logical Block Address
1
Reserved
2 - 3
Logical Block Address
Transfer Length
Control
4
5
WRITE (6) Command-Field Descriptions
Logical Block
Address
The address of the first logical block where the Write operation will oc-
cur.
The num ber of contiguous logical blocks of data to transfer. A transfer
length of 0 indicates 256 logical blocks are to be transferred. Any other
value indicates the actual num ber of logical blocks that will be trans-
ferred.
Transfer Length
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SCSI Description
The WR ITE (10) command requests that the drive write initiator-supplied data to the
5-215 respectively.
WRITE (10) Command Descriptor Block-Data Format
0
Operation Code (2Ah)
DPO FUA
1
2 - 5
6
Reserved
Reserved
RelAdr
Logical Block Address
Reserved
7 - 8
9
Transfer Length
Control
WRITE (10) Command-Field Descriptions
Disable Page Out. When the value of the field is 1, the drive tells the control-
ler to bypass cache as m uch as possible. The buffers used for the WRITE
data are given a low priority. This bit m ay be useful if the host CPU is per-
form ing a background copy operation and does not want to wipe out the
drive's cache.
DPO
When DPO is 0, the drive tells the controller to cache this WRITE data in a
norm al m anner.
NOTE: The drive norm ally assigns a low priority to write caching. Therefore,
the DPO bit in a WRITE com m and is ignored.
Force Unit Access. When 1, the data m ust be written on the m edium before
GOOD status is returned. When 0, GOOD status m ay be returned after the
data is fetched from the initiator and before it is written to the m edium . If
the WCE (Write Cache Enable) bit on the MODE SELECT com m and Caching
Page is clear, the FUA bit is ignored and behaves as if it were always set (that
is, if WCE = 0, the controller forces FUA = 1).
FUA
Logical Block
Address
The address of the first logical block where the Write operation will occur.
Relative Address. This drive does not support this feature; the field m ust be
0.
RelAdr
The num ber of contiguous logical blocks of data to write. The drive returns
CHECK CONDITION status with the correct sense data if the specified trans-
fer would cause the write operation to extend beyond the Logical Block Ad-
dress space.
Transfer
Length
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SCSI Description
The WRITE AND VER IFY command writes host-supplied data to the unit and
verifies it was written correctly. The data format and field descriptions are shown in
WRITE AND VERIFY Command Descriptor Block-Data Format
0
Operation Code (2Eh)
1
Reserved
DPO
Reserved
BytChk
RelAdr
2 - 5
6
Logical Block Address
Reserved
7 - 8
9
Transfer Length
Control
WRITE AND VERIFY Command-Field Descriptions
Disable Page Out. When the value of the field is 1, the drive tells the con-
troller to bypass cache as m uch as possible. The buffers used for the
WRITE data are given a low priority. This bit m ay be useful if the host CPU
is perform ing a background copy operation and does not want to wipe out
the drive's cache.
DPO
When DPO is 0, the drive tells the controller to cache this WRITE data in a
norm al m anner.
NOTE: The drive norm ally assigns a low priority to write caching. There-
fore, the DPO bit in a WRITE com m and is essentially ignored.
Byte Check. When 1, the drive perform s a byte-by-byte com parison of the
data written on the m edia with the data transferred from the initiator.
BytChk
RelAdr
When 0, the drive perform s a m edium verification with no data com parison
of the sectors written by the com m and.
Relative Address. This feature is not supported and the field m ust be 0.
Logical Block
Address
The address of the first logical block where the WRITE operation will occur.
The num ber of contiguous logical blocks of data to write and verify. The
drive returns CHECK CONDITION status with the correct sense data if the
specified transfer would cause the write operation to extend beyond the
Logical Block Address space.
TransferLength
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SCSI Description
The WRITE BUFFER and the READ BUFFER commands allow the initiator to
gain access to the data storage areas within the drive controller. These commands are
used to check the integrity of the buffer-initiator data path independent of the storage
medium, typically for fault isolation. The commands can be used to verify the caching
policies of the controller or other kinds of debug work. In addition, the WR ITE
BUFFER command supports controller microcode downloads. The data format and
Both the R EAD BUFFER and WRITE BUFFER commands have a Buffer ID and a
Buffer Offset data field defined in their Command Descriptor Block. In combined
Header and Data Mode, if both are set to 0, reference is made to a single, 512-byte
buffer set aside in the controller's data memory, independent of cache. This allows an
initiator to verify the data path from the controller's data memory to the initiator
without affecting the drive's internal data caches.
WRITE BUFFER Command Descriptor Block-Data Format
0
1
Operation Code (3Bh)
Reserved
Mode
2
Buffer ID
Buffer Offset
3 - 5
6 - 8
9
Param eter List Length
Control
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SCSI Description
WRITE BUFFER Command-Field Descriptions
Four m odes are supported by the drive; Com bined Header and Data, Data Only, Download
Microcode and Save, and Write Data from Echo Buffer. The perm issible values for Buffer
ID, Buffer Offset are as follows:
Mode
0000b
Com bined Header and Data – In this m ode, the data to be transferred is preceded by a 4-
byte header that contains reserved bytes that m ust be set to 0. The resulting descriptor and
data are fetched from the initiator during the com m and's data-out buffer transfer and, after
the descriptor has been validated, only the data is written to the controller's m em ory.
m ust be 0
m ust be 0
m ust be set to between 0 and 516 (4 bytes of header and up to 512
bytes of data).
Data Only– In this m ode, the data-out buffer transfer contains buffer data. Data is written
to the drive's buffer starting at the location specified by the Buffer ID and Buffer Offset.
. When non-zero, the value specifies a specific track line in the controller’s cache.
If Buffer ID of zero is specified, the buffer referenced is the sam e as if Buffer ID of one were
specified.
0010b
. When non-zero, the value can range from 0 to one less than the num ber of
sectors/track m ultiplied by 512. This value m ust be either a zero or a m ultiple of 512.
. This value m ust be a m ultiple of 512. The m axim um value for this
field is one m ore than the num ber of sectors/track tim es 512. The m inim um value is 0.
In this m ode, a m icrocode im age is transferred to the drive,
and if valid, is saved in the controller's non-volatile m em ory. This im age m ust be transferred
with all buffers of the sam e size (the last buffer of the transfer cannot be of a different size)
and the buffer size m ust be a m ultiple of 512. Most im ages are m ultiples of 512 and 1K. In
that case, it is safe to have 512 byte transfers or 1K transfers. For exam ple, if the im age
size is 369K, then 738 512-byte buffers can be transferred or 369 1K byte buffers can be
transferred. It is also possible to transfer the im age in one large buffer.
0101b
The controller does a hard reset on com m and com pletion. In Download Microcode and Save
m ode, the other Com m and Descriptor Blocks are supported as follows:
– Undefined and ignored.
– The offset of the buffer being transferred. For exam ple: for 512 byte trans-
fers use 0, 512, 1024, 1536,.... For 1K byte transfers use 0, 1024, 2048, 3072...
– Must be the size of the buffer being transferred.
7
This m ode acts the sam e as m ode 0101b but
is restricted to sending the bytes in sequential order.
(0111b)
Write Data from Echo Buffer
In this m ode, the host transfers data and stores it in an echo buffer. The data will be pre-
served in the echo buffer unless there is an intervening com m and.
1010b
Ignored.
Ignored.
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SCSI Description
The WRITE LONG and R EAD LONG commands allow the initiator to issue raw
reads and writes of physical sectors addressed as logical blocks with an assumed sector
length of 512 bytes. These commands are used to verify the correction capability of
the drive's ECC and to create defects of a known kind and location to verify the drive's
recovery and bad sector handling policies. The data format and field descriptions are
WRITE LONG Command Descriptor Block-Data Format
0
Operation Code (3Fh)
Reserved
1
2 - 5
6
RelAdr
Logical Block Address
Reserved
7 - 8
9
Byte Transfer Length (562)
Control
WRITE LONG Command-Field Descriptions
Relative Address. This drive does not support this feature; the field m ust
be 0.
RelAdr
Logical Block
Address
The address of the first logical sector where the Write operation will occur.
Must be 562. This value reflects the num ber of bytes spanned by the ECC,
including the ECC itself, rounded up to the next word (this is easiest un-
derstood in bits: 4096 data bits + 1 force error bit + 15 Logical Block Ad-
dress bits + 16 cross check bits + 2 pad bits + 360 ECC bits + 6 pad
bits that are not written to m edia but are only needed for transfer = 4496
bits or 562 bytes). Any other value in this field results in a CHECK CON-
DITION status and the appropriate sense data.
Byte Transfer
Length
The initiator should first issue a READ LONG, then m odify the data portion
only, and then issue a WRITE LONG. It is also recom m ended that the drive
be reform atted after these com m ands are used.
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SCSI Description
The WRITE SAME command requests that the drive write the single sector of data
transferred by the initiator to the medium multiple times. The data format and field
WRITE SAME Command Descriptor Block-Data Format
0
Operation Code (41h)
1
Reserved
PBdata
LBdta
RelAdr
2 - 5
6
Logical Block Address
Reserved
7 - 8
9
Num ber of Blocks
Control
WRITE SAME Command-Field Descriptions
Physical Block Data. – Not supported.
PBdata
Logical Block Data. – A value of 1 requests that the drive replace the first four
bytes of the data to be written to the current logical sector with the logical sector
address of the sector currently being written.
LBdata
RelAdr
Relative Address. – Not supported.
Logical
Block Ad-
dress
The address of the first logical sector where the Write operation will occur.
This field contains the num ber of contiguous logical blocks that are to be written.
A value of 0 requests that all the rem aining logical blocks on the m edium are to
be written.
Num berof
Blocks
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SCSI Description
The WR ITE SKIP MASK command allows the initiator to condition the function of
the WR ITE commands to allow only selected data to be transferred over the SCSI
interface. A WRITE SKIP MASK command precedes a WR ITE (10) command; the
WR ITE (10) command must be linked to the WRITE SKIP MASK command or the
skip mask is lost and a CHECK CONDITION status is returned. The data format and
WRITE SKIP MASK Command Descriptor Block-Data Format
0
1
Operation Code (EAh)
Reserved
(MSB)
2 - 5
6
Logical Block Address
Skip Mask Length
Transfer Length
Reserved
(LSB)
(MSB)
VU
7 - 8
9
(LSB)
Link
Flag
WRITE SKIP MASK Command-Field Descriptions
Logical
Block Ad-
dress
This field specifies the first logical block of the corresponding WRITE (10)
COMMAND. This allows a SEEK to begin im m ediately. The LBA of the fol-
lowing WRITE (10) com m and m ust the sam e as the LBA of the WRITE SKIP
MASK com m and.
Skip Mask
Length
This field indicates the length in bytes of the skip m ask. The m ask is up to
2048 bits, giving a data address capability of 1 MB in 512-byte block length.
The m ask consists of a sequence of bits where a “1” bit is for the blocks of
data to be transferred, and a “0” for the blocks of data that are to be skipped.
The first “1” bit of the m ask corresponds to the first LBA to be transferred.
Any unused bits at the end of the last byte in the m ask m ust be set to 0. The
m ask is transferred in the data-out buffer transfer of the skip m ask com m and.
Transfer
Length
bits in the skip m ask. If a WRITE (10) is used with 0 as the transfer
length, a transfer length of 256 data blocks is im plied.
Maxtor Atlas 10K III
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SCSI Description
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Maxtor Atlas 10K III
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This chapter provides descriptions of many of the features incorporated in the Maxtor
Atlas 10K III hard disk drive family.
Maxtor Atlas 10K III disk drives provide unequaled quality and performance. They
are designed to improve the performance of high-end workstations, file servers, and
storage systems. Among their features are the following:
• 18.3 GB, 36.7 GB, or 73.4 GB formatted capacity (512 bytes/ block)
• MR heads and banded recording for higher overall bit-densities
• Self-Monitoring, Analysis, and R eporting Technology (S.M.A.R .T.)
R evision 2 support
• OR CA (Optimized R eordering Command Algorithm) and tagged
command queuing for greater throughput
• SCAM-2 (SCSI Configured AutoMatically) Auto ID configuration
• 8 MB Track-oriented segmented cache buffer with prefetch
• Automatic Power Management System with power-saving sub-states
• 10,000 rpm rotational speed yielding 3 ms average latency
• 4.5 ms/ 5.0 ms average read/ write random seek time for 18.3/ 36.7/ 73.4
GB disk drives
• Embedded servo system for exceptional head positioning accuracy and
long life
• “Zero latency” reads and writes reduce data access time
• Full SCSI-3 compliance (compatible with SCSI-2 and SCSI-1)
Note: The drives are in compliance with the SCSI-3 draft proposed ANSI
standards as they exist at the time of product release; SCSI-3 features
may not be enabled on drives when shipped.
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Feature Descriptions
• Advanced Ultra160 SCSI-LVD, Ultra320 SCSI-LVD, Ultra2-LVD, and
Ultra-SE with
68-pin wide connector or 80-pin SCA-2 connector
• Superior data integrity:
•352-bit R eed-Solomon quad-burst ECC provides fast on-the-fly
correction for small errors and robust software-based correction for
larger errors
•EDC internal protection from SCSI bus to media
Many of these features are described in this chapter.
The drive contains a large, segmented buffer in R AM that is used to maximize the
throughput for sequential read streams. This cache is organized as a number of separate
track line segments. Each track line segment can hold data from one complete track
on the media, temporarily assuming the identity of the track for all input/ output
functions.
The buffer is also used to combine or coalesce I/ O data on a track-by-track basis,
prior to accessing the disk media. Performance is greatly improved by gathering and
combining the data on a track basis rather than on a command basis. With this unique
system, multiple commands for a particular track are coalesced in the buffer before
accessing the media.
As a result, multiple I/ O commands, that address a single track are logically combined
to avoid multiple disk accesses on multiple rotations. Since most reads and writes are
sequential, this greatly increases throughput for most applications.
The drive supports prefetch. After the controller has copied an entire media track into
a cache track line segment, a unique algorithm determines whether:
• The most recently used cache track line (track n) satisfies a read request;
• The cache memory also includes another track line (track n-1)
corresponding to the media track preceding the one that was just copied,
and;
• There is no other work currently waiting for service by the read/ write
system.
If all three of these conditions are met, there is a high probability that the host will call
for data from the next media track (track n+1). So, the drive controller automatically
issues a read for that data and substitutes it for the information in the n-1 track line
segment in cache. This process, called prefetch, gives the drive a very high cache hit
rate for sequential reads.
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Feature Descriptions
The drive supports write-back caching. In this case, writes are considered complete
when the data is loaded into the cache, before it is written to the media. This allows
the host to go on to other tasks, while the drive assumes responsibility for the data and
ensuring that it is written to media as soon as possible. If write-back caching is
employed, it is recommended that an uninterruptible power source (UPS) be
provided for optimal data security.
An average of half a revolution of latency is saved by starting to read or write as soon
as a seek settles on the designated track. If reading, the initial data read is stored in a
buffer (cache) until the actual starting address data block is reached and read. The
starting address data is then transferred to the bus as the rest of the data is transferring
from media to the buffer. When the initial data address read is reached again, that data
in the buffer is transferred to the bus. This ensures that the track data goes out in media
order and eliminates the rotational latency associated with waiting for the starting
address to rotate to the head.
Writing works essentially the same way only in reverse. The data is first transferred to
the drive's buffer. After seeking to the desired track, a write pointer is set to the current
location of the head on the track and writing is commenced from the buffer, starting
at the corresponding place in the data.
System throughput can be improved by disconnecting the drive from the initiator
during physical positioning operations, thereby freeing up the SCSI bus for other I/
O processes. After the drive has determined that there will be a delay, it disconnects
itself from the SCSI bus by sending a DISCONNECT message and enters the BUS
FREE phase.
When the drive is ready to resume data transfer, it arbitrates for the SCSI bus and, after
winning arbitration, reconnects to the initiator and sends an IDENTIFY message via
the MESSAGE IN phase. This revives the I_T_L nexus (initiator-target-logical unit
connection) so the initiator can retrieve the correct set of data pointers for the I/ O
process. The initiator restores the active pointers to their most recent saved values, and
the drive continues to finish the original I/ O process.
Disconnect-R econnect is controlled with the Mode Select Command (15h) for the
Disconnect/ R econnect (02h) mode page.
The disk drive improves data throughput by skewing track and cylinder addresses.
When the drive switches heads or tracks, or both, to access sequential data, the
rotation of the disk media allows one or more physical blocks to pass by the read/ write
head before the head is ready to continue the transfer. Skewing adjusts the block
addresses so that the head switch and settle times and the media rotation coincide to
bring the head exactly to the next logical block. This minimizes rotational latency (and
increases throughput) when data is accessed sequentially.
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Feature Descriptions
A 10,000 rpm rotation speed yields an average latency of 3 ms.
Embedded servo information is written in a spoke configuration on every track, on
every disk surface. The spokes (or headers) consist of quadrature analog patterns and
digital address data. The digital portions of the spoke data are read and used to locate
the desired track, spoke, and head number. The quadrature analog signal portion is
detected and used by a servo feedback control loop to precisely position the head on
the track center.
The disk drives use a combination of parity checking, error detection coding (EDC),
error correction coding (ECC), and checkpointing to protect stored data from media
errors, transfer or addressing errors, or errors introduced during block reallocation.
To ensure that data read is the same as data written, the drive computes and appends
an Error Correction Code (ECC) to each block of data stored. The drive uses a 352-
bit R eed Solomon code with a 4:1 interleave, which can correct up to 20 bytes in
each block.
The drive can also correct up to 2 bytes per interleave (up to 8 per block) in hardware
(“on-the-fly”), with no loss in throughput.
An end-to-end error detection code (EDC) protects data from any errors introduced
by internal buses, the disk controller chip, the data cache, or the SCSI interface.
An EDC is calculated and added to each data block as the data arrives from the SCSI
bus (after SCSI bus parity is checked). The EDC is stored with the data and protected
by the block ECC for added security. On reading or writing, the EDC is checked as
the data is transferred between buffer R AM and the media or the SCSI bus.
Each data block on the media is identified and located by a servo spoke address. The
spoke address consists of a two-byte word. Each spoke has multiple copies of the least
significant bytes of the address. The disk hardware requires that a majority of the
copies agree and that the result agrees with the expected head, track, and spoke
number, before it will read or write the data.
To further protect against addressing errors, the logical address (LBA) of the data is
added to the EDC of each block. If data is written to the wrong block and
subsequently read, or read from the wrong block, the error will be flagged.
The hardware does not allow a blind read of a data block; the firmware must request
specific data blocks. Even if the head selection hardware malfunctions, it is not possible
for the drive to return data from the wrong head.
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Feature Descriptions
In any SCSI disk drive, bad blocks may be reallocated. However, a power failure or
unrecoverable data could threaten data integrity during a block reallocation.
The reallocation and defect list storage algorithms prevent a reallocation from being
lost due to a power failure. Once a reallocation starts, the information about the data
block to be moved is stored on the media. As the reallocation progresses, checkpoint
information about the reallocation (such as the new destination and the data in transit)
is recorded. If the reallocation is interrupted, the process can automatically continue
from the last checkpoint without data loss.
If a block reallocation is performed on unrecoverable data (rare), a Bad Data Mark is
set in the new location. Thus, there is no chance of undetected bad data being
generated from a reallocation.
Data can be verified in two ways. First, the integrity of data in selected areas of the
media can be checked using the VER IFY command. Secondly, the WR ITE AND
VER IFY command writes host-supplied data and then verifies that it was written
correctly.
The Verify Error R ecovery Page of the MODE SELECT COMMAND controls the
drive's response to error conditions that arise during the VER IFY command and
during the verify operation of the WRITE AND VER IFY command.
The drive supports all three SCSI-defined queue tag messages. When queuing is
enabled (default condition), the drive can accept any of the following:
• Simple - specifies that the command is to be placed in the drive's
command task set (queue). If several commands are present, the drive
may reorder them to increase overall throughput.
• Head of Queue - directs the drive to place the command at the
beginning of the queue, to be executed next. Consecutive commands
with Head of Queue specified are executed in last-in-first-out (LIFO)
order. Queue depth is 64.
• Ordered - specifies that commands in the drive's task set are to be
executed in the order received (FIFO).
The DQue bit (disable queuing) of the Control Mode page can be used to disable
tagged command queuing.
The drive uses Optimized R eordering Command Algorithm (ORCA) and tagged
command queuing to provide greater throughput by reordering any commands
queued on the drive to minimize rotational latency, seek time and head selection time.
The performance improvement is significant in heavily loaded applications where
queue depth exceeds 10-15 commands.
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Feature Descriptions
In banded recording, the disk is divided into multiple bands (also called partitions,
notches, or bit-zoned areas). Starting at the inner band, each band further out has
more blocks per track (a higher recording frequency). This use of multiple-frequency
recording increases the capacity of the drive.
Maxtor has incorporated a number of unique options into the drive. The Maxtor
(Vendor) Special Function Control page is used to control these options. The options
include:
• Initiate Synchronous Data Transfer Negotiation - a toggle-type
parameter that allows the initiator to move between asynchronous and
synchronous modes of data transfer.
• Write Protect - Prevents writing to the disk drive.
• Spin Delay - specifies if the drive should spin-up at power on or wait for
a START STOP UNIT command from the host.
• Stagger Spin Delay - allows a series of drives to be spun up individually,
reducing the load on the system power supply.
The Maxtor Atlas 10K III hard disk drives have three basic power states:
• OFF - power is removed from the drive.
• UNIT READY - the drive is powered on and is ready to accept and
execute commands. A single sub-state of UNIT READY exists,
ACTIVE. This is the highest power consumption state of the drive. A
media access command is acted upon immediately by the drive.
The drive remains in the UNIT R EADY state.
• NOT READY - The drive is powered on but cannot be addressed. An
example of this state is during spin-up. In other cases the drive may
require operator intervention. This state will return a Status = Check
condition.
The Power Condition Page, controlled with the MODE SELECT command, sets the
drive Power Management functions. This page is not changeable.
The drive has extensive diagnostic capabilities, including those described below:
power-on self-test, periodic self-adjustments, and host diagnostics. Maxtor uses self-
diagnostic tests and sense data tracking to manage drive errors, in addition to logical
block address (LBA) revectoring.
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Feature Descriptions
The disk drive performs a self-diagnostic test immediately at power up. Both the Fault
LED and a Busy LED briefly illuminate during spin-up as a lamp test.
If the drive passes the self-tests (and the spin-up jumper is installed), it spins up and
performs further diagnostics on the Head Disk Assembly (HDA). The drive indicates
“not ready” until the HDA tests are completed successfully.
The drive diagnostics test the following:
• R AM and R OM chips
• Buffer memory
• Gate array chips
• R ead/ write encoding circuits
• Basic servo functions
After a SELECTION TIME following power-on, the disk drive is able to respond
with appropriate status and sense data to the TEST UNIT READY, INQUIR Y, and
R EQUEST SENSE commands.
During normal drive operation, certain periodic functions occur automatically so the
drive can verify and maintain the integrity of its operations and optimize performance.
The operations performed include those listed below.
• Move/ Switch idle heads
• Adaptive seek profile calibration
• R OM checksum
Such periodic functions can make the drive appear to be active when no commands
are outstanding, because the drive appears to be seeking. Periodic calibrations occur
only after the drive has been inactive for 30 seconds.
Note: If a media access command is received during a calibration, the
drive aborts the calibration process and acts on the command.
If desired, calibrations can be suspended to reduce drive overhead by setting the
Manual Calibration bit in the (Vendor) Special Function Control page. If this is done,
manual calibrations can still be initiated by performing a R EZER O UNIT command.
The Host Processor can command the drive to perform diagnostic tests and report
status using R ECEIVE and SEND DIAGNOSTIC RESULTS commands. Certain
parameters can be sent to the drive to alter or enhance the performance of the
diagnostic tests specified.
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Feature Descriptions
Maxtor implements multiple LOG SENSE pages which logically group together
parameters related to disk and subsystem activities. Monitoring this data enables users
to observe drive performance and possibly predict failures.
The mode pages control all error recovery. Any error recovery that is enabled is
attempted without host intervention.
Seek error recovery is automatic if the hardware is physically able to position to the
correct track.
Data read errors are recovered, if possible, by one or more of the following methods:
• Correction of the data “on-the-fly” with ECC hardware.
• R e-try the operation.
• R eload read channel registers to calibrated values.
• Off-track R ecovery. Use different off-track offsets and re-try.
• Use a fixed gain while retrying.
• Margin servo thresholds to facilitate seek and detent.
• Margin the error tolerance of sync mark detection.
• Force sync mark detection while retrying.
• Skip Sector R ereads. R etries, each without one of eight earlier servo
blocks.
• Correction of the bad data with the software ECC algorithm.
• Switching the bias current of the MR head between retries.
• TA baseline compensation, and other TA recovery methods.
Most of the spare blocks are located on the inner cylinders of the drive. All defective
blocks are in-line spared at the factory or at format time. Some spare blocks are
allocated at the end of each band, and are reserved for grown, revectored blocks. All
grown defects are reallocated to one of the spare blocks, using a “nearest neighbor”
algorithm.
If bad block replacement is enabled (via the AWRE and AR RE bits in the R ead-
Write Error R ecovery Page), blocks that are difficult to read or write may be replaced
after multiple retries.
If the bad block data is recoverable, the drive first verifies that the original block
location is bad with multiple write tests. If the write tests fail, the original data is
reassigned to a new location.
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Feature Descriptions
If the block's data is unrecoverable, the block may or may not be replaced according
to the state of the RUEE bit in the Maxtor Vendor Unique Page. If the R UEE bit is
set, the bad data is relocated with a Bad Data Mark appended to it. If the PER bit is
set in the R ead-Write Recovery Page, operations resulting in bad block replacement
activate Check
SCAM is a process of automatic ID assignment that eliminates the need for user
involvement in the setting of unique SCSI IDs. The drives support and conform to
the SCAM-2 automatic ID assignment protocol contained in the SCSI-3 draft
standards for SCAM. The drives are also fully compatible with SCSI devices that do
not comply with SCAM requirements.
SCSI-3 provides increased performance and versatility to SCSI disks. LVD uses lower
level voltage swings, differential signaling, and double transition (DT) clocking to
allow a maximum bus speed of 160 or 320 MB/ second in wide SCSI configurations.
The Maxtor Atlas 10K III disk drive supports the LVD/ MSE (Multi-Mode LVD and
Single-Ended) interface standard. When installed on a bus with only LVD devices the
Maxtor Atlas 10K III disk drive operates in LVD mode at transfer rates up to 160 or
320 MB/ second. It is fully compatible with Ultra2 LVD devices operating at slower
transfer rates. If an Maxtor Atlas 10K III disk drive is installed on a bus with one or
more single-ended (SE) devices, it automatically switches modes to operate in SE
mode at the slower, legacy data rates.
Differential SCSI operation has the advantage of higher reliability of data transfer
through increased immunity to electrical noise. Differential signaling uses a two-wire
active system in which current from each wire flows in opposite directions and
reverses direction for a signal transition. The direction of current flow determines
whether the voltage levels on the two wires have a high/ low or low/ high relationship
to each other. The common mode, or reference, level for the two LVD signals is
+1.25 volts. High and low is defined relative to this level. LVD permits a wide range
of signal amplitudes. The Maxtor Atlas 10K III interface drivers are designed to
provide a high to low range on each signal of approximately 400 millivolts in a
nominal configuration, resulting in a differential signal of approximately 800
millivolts.
Single-ended SCSI, in contrast, uses one-wire active signaling with the signal return
wire connected to ground. The active signal range is switched between a high in the
range of +2.4 - 3.0 volts and a low in the range of 0 - +.5 volts. LVD/ MSE SCSI
devices in single-ended mode do not have the signal return wires connected directly
to ground, as these same pins must be driven to LVD levels when the device is
operating in LVD mode. Instead, when in single-ended mode, the device turns on a
driver transistor for each return line that acts as a switch to connect the signal return
to ground.
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Feature Descriptions
The DIFFSENS signal in the SCSI bus defines the current operating mode of the
SCSI bus. A level below +.5 volts defines a single-ended bus. A level between +.7
and +1.9 volts defines an LVD bus. A level above +2.4 volts defines a High Voltage
Differential (HVD) bus. Before LVD was introduced, HVD was simply called
Differential SCSI.
All single-ended-only devices connect the DIFFSENS signal to ground. On an LVD
bus, the terminators drive the DIFFSENS signal to +1.3 volts unless some device is
holding the signal at ground. HVD devices pull DIFFSENS up to +5 volts via a
resistor.
The Maxtor Atlas 10K III disk drive is designed with a circuit that monitors the level
of DIFFSENS at power-on. The drive then enables the appropriate circuits for LVD
or single-ended operation, or disables its interface completely if it detects an HVD
level on DIFFSENS.
The two normal operating environments for the Maxtor Atlas 10K III disk drive are
an all-LVD or (LVD/ MSE) bus, in which case it operates in its LVD mode, or a bus
that contains at least one single-ended device, in which case the Maxtor Atlas 10K III
disk drive operates in single-ended mode.
HVD mode is not supported by the Maxtor Atlas 10K III disk drive. Signal levels on
an HVD bus can reach as high as +15 volts due to allowed common mode transients.
After establishing its initial operating mode, the Maxtor Atlas 10K III disk drive
continues to monitor the DIFFSENS signal. If a change in level is detected, such as
might occur if a device is added to or removed from the bus, the DIFFSENS circuit
detects the change and presents a mode change interrupt to the drive firmware. The
operating mode of the interface switches to the new mode 100 msec after the change
is detected, providing the new level has remained constant. This delay is required to
prevent spurious mode switches due to noise on the DIFFSENS line.
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Feature Descriptions
With Ultra160 and Ulra320 SCSI interfaces, Maxtor has introduced a new method of
clocking data on the SCSI bus. This method, called Double Transition (DT) clocking,
uses both the rising and falling edges of the REQ and ACK signals to clock data into
the receiving device. This has the advantage of allowing the R EQ and ACK signals
to run at half the frequency that would be required under the traditional Single
Transition (ST) SCSI clocking scheme for the same data rate. Lower frequency clocks
clocking.
ST and DT CLocking
The Maxtor Atlas 10K III disk drive can operate at speeds up to 80 MB/ sec in either
ST or DT modes, depending on the capabilities of the host adapter. Transfer rates
above 80 MB/ sec are only supported in DT mode, as required by the SPI-3 SCSI
standard.
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Feature Descriptions
When transferring data with DT clocking on the SCSI bus, a significantly improved
form of error checking, cyclic redundancy checking (CR C) is used instead of the
traditional parity checking. With CR C checking, the device sending data generates a
four-byte CRC character based on the contents of the bytes being transferred. The
receiving device also generates a CR C character as it receives the bytes. At the end of
a data burst, the sending device transfers its CRC character and the receiving device
compares the sender's CRC with its own. If the two CR C characters match, then the
data burst transferred without error.
In ST mode, the Maxtor Atlas 10K III uses the traditional parity checking method to
ensure error free data transfers.
A new feature (also known as “physical layer integrity checking”) in Ultra160 and
Ultra320 SCSI interfaces is the capability of the initiator and target devices to execute
a test sequence of commands before customer operation begins to ensure that the
SCSI bus can support the desired transfer rate. If errors are found, the initiator can
negotiate different transfer parameters until a working configuration is found.
• Domain validation can detect configuration problems such as:
• Wide devices with a narrow bus segment between them
• DT devices connect through an ST expander
• Broken connections
It may also detect poor quality cables, marginal quality signals, and improper
termination.
Domain validation is implemented using standard SCSI commands and new versions
of the WR ITE BUFFER and R EAD BUFFER commands. The sequence of
commands used for domain validation may vary from system to system. The selection
of commands used is entirely under control of host firmware and software.
Also known as “receiver equalization with filtering.”AAF is a closed-loop method of
improving received signal quality by amplifying the fundamental frequency of the
signal while filtering noise and other undesirable com-ponents. Devices implementing
AAF establish the gain of its amplifiers by setting the amplitude of the high-frequency
portion of the training pattern to be the same as the low-frequency portion at the
beginning of the training pattern. Using the training pattern to perform this
adjustment of signal amplitude provides for an inherent closed-loop system that can
adjust signal quality for different cable plants and changes in system conditions (e.g.,
when a new device is added to a system causing the electrical characteristics of the
cable plant to change). AAF settings may be adjusted as often as necessary because
either the initiator or target may initiate the training pattern sequence. A receiver may
disable transmitter pre-compensation in a transmitter as AAF performs better in the
configuration.
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Feature Descriptions
This is an open-loop method of compensating for some of the signal loss that is most
severe on the first part of a signal’s transition.
FRC is used to improve integrity of the clock signal by removing inter-symbol
interference (ISI). By having a clock running at a constant neutralized. The free
running clock is restricted for use with DT information unit transfers at 320 megabytes
per second.
Skew c ompensation of data signals relative to the clock signal; an Ultra320 SCSI
device can establish skew compensation simulta-neously for each of the received
transitions on the data lines so that they occur at the correct time relative to the clock.
IUT (or “IU Transfers,” also known as “packetized transfers”) is a method to
encapsulate non-data information (like commands sent from the initiator to the target
and status sent from the target to the initiator) into packets and transfer those packets
at the maximum negotiated data rate of up to 320 megabytes per second. A method
to transfer packets for a number of I/ O processes without an intervening physical
disconnection. A method to minimize overhead by eliminating several bus phase
changes per I/ O process.
The Maxtor Atlas 10K III SCA low voltage differential (LVD) disk drives are designed
for use in “Hot Swap” applications within a properly designed and configured SCSI
system. With care, system integrators can design storage arrays and/ or SCSI buses
using Maxtor Atlas 10K III disk drives that are “Hot Swap Case 4" tolerant.
Case 4 is defined as follows:
• Devices are powered and the bus may have active I/ O processes
ongoing, but the device being removed or inserted must be idle (no
ongoing I/ O processes during the insertion/ removal).
• Ground connections to the drive must be made and maintained for 1
millisecond before, during, and 1 millisecond after the insertion/
removal. The SCA-2 connector used on the Maxtor Atlas 10K III disk
drive meets this requirement.
• Device circuitry connected to bus pins must remain “glitch” free during
power up or power down.
Note: In a multimode environment, any insertion or removal that
changes the bus mode causes a transceiver mode change reset
event.
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Feature Descriptions
It is not possible for the suppliers of various system components (e.g., targets, initiators,
backplanes, terminators) to guarantee that a system can operate under “Hot Swap Case
4" conditions. Therefore, the system integrator bears the responsibility for ensuring
that the system can meet “Hot Swap Case 4" operational criteria.
There are two metrics key to ensuring “Hot Swap Case 4" tolerance:
1. When a drive is being hot inserted into an active bus, a smaller capacitance on the
SCSI bus pins create a smaller (that is, a lesser charge) transient spike on the bus.
2. When the drive is the closest drive to the connector at which another drive is
being hot inserted, it is desirable that the input receivers ignore short low
amplitude transients (usually via a low pass filter).
LVD SCSI devices may require more stringent system design to tolerate transients that
occur during Case 4 insertion or removal. System integrators should consider the
following when designing their backplanes or buses:
2. Larger SCSI signal-trace capacitance (that is, lower impedance) is preferable for
minimizing transient spikes, but can cause other bus problems unrelated to hot
swapping. Draft standard SCSI-3 SCSI SPI-2 (SCSI Parallel Interface), Revision
18, Section 6.6.2 illustrates the trade-offs between trace capacitance and drive-to-
drive spacing.
3. The universe of drives needs to be homogeneous. A 15 pF drive hot-inserted into
a rack of 15 pF drives presents no difficulty. A 30 pF drive inserted into a rack of
10 pF drives with very close connector spacing, however, is more likely to cause
problems.
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Feature Descriptions
If additional information is required, refer to the following documentation:
• SCSI-3 SPI (SCSI Parallel Interface), revision 15, now ANSI Standard
No. X3.253.1993
- Device Insertion/ R emoval classes
• SCSI-3 Fast-20, revision 6, now ANSI Standard No. X3.277.1996
- Documents 20 Mega-transfer/ second operation
- Defined active negation
• SPI-3 Specification Revision 6
- Defines LVD signaling
- Defines Multimode (LVD/ SE) transceivers
- Defined LVD active terminators
- Defines Multimode (LVD/ SE) terminators
- Defines new functionality for the DIFFSENS pins
- Documents 40 Mega-transfer/ second operation
- Documents LVD connector pin assignments for LVD buses
- This document is a superset of SCSI standards, incorporating contents of
both SPI and Fast-20
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Feature Descriptions
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Appendix A is a synopsis of SCSI commands, associated pages, messages, sense keys
and status codes used in this manual.
Note: R eserved fields in CDBs and Parameters have a value of 0; R e-
served fields in states and other parameters sent to an initiator are
set to 0.
documents.
SCSI-2/ SCSI-3 Equivalent Terminology
abort
abort task set
abort task
abort tag
bus device reset
clear queue
target reset
clear task set
task com plete
continue task
head of queue
ordered
com m and com plete
continue I/O process
head of queue tag
ordered queue tag
incorrect initiator connection overlappedcom m ands
I/O process
phase
task
service
task set
task set full
sim ple
queue
queue full
sim ple queue tag
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Appendix A
corresponding op codes.
SCSI-3 Quick Reference – Commands
CHANGE DEFINITION
FORMAT UNIT
INQUIRY
LOG SELECT
LOG SENSE
MODE SELECT (6)
MODE SELECT (10)
MODE SENSE (6)
MODE SENSE (10)
PERSISTENT RESERVE IN
PERSISTENT RESERVE OUT
READ (6)
40
04
12
4C
4D
15
55
1A
5A
5E
5F
08
28
3C
25
37
B7
3E
E8
07
81
1C
82
17
57
A3
A0
03
16
56
01
READ (10)
READ BUFFER
READ CAPACITY
READ DEFECT DATA (10)
READ DEFECT DATA (12)
READ LONG
READ SKIP MASK
REASSIGN BLOCKS
REBUILD
RECEIVE DIAGNOSTIC RESULTS
REGENERATE
RELEASE (6)
RELEASE (10)
REPORT DEVICE IDENTIFIER
REPORT LUNS
REQUEST SENSE
RESERVE (6)
RESERVE (10)
REZERO UNIT
SEEK (6)
SEEK (10)
0B
2B
1D
A4
1B
35
00
2F
0A
2A
2E
3B
3F
41
EA
SEND DIAGNOSTIC
SET DEVICE IDENTIFIER
START/STOP UNIT
SYNCHRONIZE CACHE
TEST UNIT READY
VERIFY
WRITE (6)
WRITE (10)
WRITE AND VERIFY
WRITE BUFFER
WRITE LONG
WRITE SAME
WRITE SKIP MASK
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Appendix A
SCSI-3 Quick Reference – Messages
ABORT
06
0D
0C
0E
00
ABORT TAG
BUS DEVICE RESET
CLEAR QUEUE
COMMAND COMPLETE
CONTINUE I/O PROCESS
DISCONNECT
12
04
EXTENDED MESSAGE
HEAD OF QUEUE TAG
IDENTIFY
01
21
80 – FF
25
IGNORE WIDE RESIDUE
INITIATOR DETECTED ERROR
05
LINKED COMMAND COMPLETE
LINKED COMMAND COMPLETE w/FLAG
MESSAGE PARITY ERROR
MESSAGE REJ ECT
0A
0B
09
07
NO OPERATION
08
ORDERED QUEUE TAG
22
PARALLEL PROTOCOL REQUEST
QUICK ARBITRATION AND SELECTION
RELEASE RECOVERY
04
55
10
SAVE DATA POINTER
02
SIMPLE QUEUE TAG
20
SYNCHRONOUS DATA TRANSFER REQUEST
TARGET TRANSFER DISABLE
WIDE DATA TRANSFER REQ.
01
13
03
SCSI-3 Quick Reference - Pages
ASCIIIm plem ented Operating Def-
inition
82
12
ASCII Inform ation
01, 02, 03
39
12
Bad Block Replacem ent Sum m ary
Buffer Overruns and Underruns
Caching
4D
01
4D
08 *
0A *
3A
15, 55
15, 55
4D
Control Mode
DER Description
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Appendix A
Device Identification
Disk Error Recovery Counters
Disconnect-Reconnect
Early Warning Status
ECC Counters and Sum m ary
Firm ware Revision
83
3A
02
36
3D
C0
03
08
81
07
0B
06
0C
09
0D
C1
39
19
12
4D
15, 55
4D
4D
12
Form at Device
1A
Form at Status
4D
Im plem ented Operating Definition
Last n Error Events
12
4D
Medium Types Supported
Non-Medium Error Counter
Notch and Partition
1A
4D
15, 55
1A, 5A
15
Peripheral Device
Power Condition
Maxtor Manufacturing Num ber
Maxtor-Unique
12
15, 55
15, 55
4D
Port Control Page
Read Error Counter
03
01
04
3E
37
38
**
00
00
00
40
00
80
C1
38
05
07
02
10
Read-Write Error Recovery
Rigid Disk Geom etry
SCSI Bus Events
15
15, 55
4D
Seek Perform ance Sum m ary
Servo Events Counter
Standard Inquiry Data
Supported Diagnostic Pages
Supported Log Pages
Supported Vital Product Pages
Translate Address
4D
4D
1C
4D
12
1C
Unit Attention Control
Unit Serial Num ber
15, 55
12
Vendor Part Num ber
Vendor-Unique Caching
Verify Error Counter
Verify Error Recovery
Write Error Counter
12
1A, 5A
4D
15, 55
4D
XOR Control
15, 55
Note: * Not supported in SCSI-1/ CSS mode
XOR is currently disabled and page is not changeable
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Appendix A
SCSI-3 Quick Reference – Sense Keys
NO SENSE
0
1
2
3
4
5
6
7
9
B
E
RECOVERED ERROR
NOT READY
MEDIUM ERROR
HARDWARE ERROR
ILLEGAL REQUEST
UNIT ATTENTION
DATA PROTECT
VENDOR SPECIFIC
ABORTED COMMAND
MISCOMPARE
SCSI-3 Quick Reference – Status Codes
GOOD
00
CHECK CONDITION
BUSY
02
08
18
28
RESERVATION CONFLICT
TASK SET FULL
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Appendix A
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This appendix provides information about the INQUIR Y command’s Negotiated
R ate Information Page that is not provided in Section 5.11.2.7. Specifically, it
provides the codes and meanings for the Transfer Period Factor field (byte 4) and a
table that explains the allowable settings for the QAS, DT, and IU fields (bits 2, 1, and
0, respectively, of byte 7).
field if the value of PARL (Parallel Protocol, bit 2 of byte 6 of the Negotiated R ate
Information Page) is 1.
Transfer Period Factor Field Values When PARL = 1
00h – 08h
Reserved.
09h
Transfer period = 12.5 ns (Fast-80 is latched every 12.5 ns). This code
is valid only if the protocol options bits (QAS, DT, and IU) of the page
have values selected that support double transition (DT) data transfers.
0Ah
0Bh
OCh
Transfer period = 25 ns (Fast-40 data is latched every 25 ns).
Transfer period = 30 ns (Fast-40 data is latched every 30 ns).
Transfer period = 50 ns (Fast-20 data is latched using a transfer period
of less than or equal to 96 ns and greater than or equal to 50 ns).
0Dh – 18h
Transfer period = the period factor x 4 (Fast-20 data is latched using a
transfer period of less than or equal to 96 ns and greater than or equal
to 50 ns).
19h – 31h
Transfer period = the period factor x 4 (Fast-10 data is latched using a
transfer period of less than or equal to 196 ns and greater than or equal
to 100 ns).
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Appendix B
32h - FFh
Transfer period = the period factor x 4 (Fast-5 data is latched using a
transfer period of less than or equal to 1020 ns and greater than or
equal to 200 ns).
Transfer Period Factor Field Values When PARL = 0
00h – 09h
0Ah
Reserved.
Transfer period = 25 ns (Fast-40 data is latched every 25 ns).
Transfer period = 30 ns (Fast-40 data is latched every 30 ns).
0Bh
OCh
Transfer period = 50 ns (Fast-20 data is latched using a transfer period
of less than or equal to 96 ns and greater than or equal to 50 ns).
0Dh – 18h
19h – 31h
32h - FFh
Transfer period = the period factor x 4 (Fast-20 data is latched using a
transfer period of less than or equal to 96 ns and greater than or equal
to 50 ns).
Transfer period = the period factor x 4 (Fast-10 data is latched using a
transfer period of less than or equal to 196 ns and greater than or equal
to 100 ns).
Transfer period = the period factor x 4 (Fast-5 data is latched using a
transfer period of less than or equal to 1020 ns and greater than or
equal to 200 ns).
Table C-3 provides valid bit combinations for the QAS, DT, and IU fields of the
INQUIR Y command’s Negotiated R ate Information Page (Section 5.11.2.7 of this
manual). Only the combinations shown in the table are valid; all other combinations
are reserved.
Settings for the QAS, DT, and IU Fields of the Negotiated Rate Information Page (INQUIRY
Command)
0
0
0
1
0
1
1
1
0
0
1
1
Selects Single Transition phases. Use ST DATA IN and ST DATA
OUT phases to transfer data
Use DT DATA IN and DT DATA OUT phases with data group
transfers.
Use DT DATA IN and DT DATA OUT phases with inform ation unit
transfers.
Use DT DATA IN and DT DATA OUT phases with inform ation unit
transfers and use QAS for arbitration.
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ALLOCATION UNIT – An allocation unit,
also known as a cluster, is a group of sectors on
the disk that can be reserved for the use of a
particular file.
ACCESS – (v) Read, write, or update
information stored on a disk or other medium.
(n) The operation of reading, writing, or
updating stored information.
ANSI – Abbreviation for American National
Standards Institute
ACCESS TIME – The interval between the
time a request is made by the system and the
time the data is available from the drive.
Includes the seek time, rotational latency, and
command processing overhead time. (See also
seek, rotational latency, and overhead.)
ASCII – Abbreviation for American Standard
Code for Information Interchange
ASIC – Acronym for Application Specific
Integrated Circuit.
ACTIVE I/ O PR OCESS– An I/ O process that
AVER AGE SEEK TIME – The average time it
takes for the read/ write head to move to a
specific location. Calculated by dividing the
time it takes to complete a large number of
random seeks by the number of seeks
performed.
is currently in execution (not queued).
ACTUATOR – Also known as the positioner.
The internal mechanism that moves the read/
write head to the proper track. The Maxtor
actuator consists of a rotor connected to head
mounting arms that position the heads over the
desired cylinder. Also known as rotary actuator.
AIR LOCK – A patented Maxtor feature that
ensures durable and reliable data storage. Upon
removal of power from the drive for any reason,
the read/ write heads automatically park and
lock in a non data area called the landing zone.
Airlock allows the drive to withstand high levels
of non-operating shock. When power is applied
to the drive, airflow created from the spinning
disks causes the Airlock arm to swing back and
unlock the actuator, allowing the heads to move
from the landing zone. Upon power down, the
Airlock swings back to the locked position,
locking the heads in the landing zone. A park
utility is not required to park the heads on drives
equipped with Airlock (all Maxtor drives).
BACKUP – A copy of a file, directory, or
volume on a separate storage device from the
original, for the purpose of retrieval in case the
original is accidentally erased, damaged, or
destroyed.
BAD BLOCK – A block (usually the size of a
sector) that cannot reliably hold data due to a
physical flaw or damaged format markings.
BAD TR ACK TABLE – A label affixed to the
casing of a hard disk drive stating which tracks
are flawed and cannot hold data. This list is
typed into the low-level formatting program
when the drive is installed. Maxtor users can
ignore bad track tables since Maxtor’s built-in
defect-management protections compensate for
these flaws automatically.
ALLOCATION – The process of assigning
particular areas of the disk to specific data or
instructions. An allocation unit is a group of
sectors on the disk reserved for specified
information. On hard disks for small computer
systems, the allocation unit is usually in the form
of a sector, block, or cluster. (See also allocation
unit.)
BANDING – A method of variable frequency
recording on the media that attempts to keep
the bit density constant, regardless of the track
radius. Banding greatly increases capacity and
data transfer rates.
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Glossary
BEZEL – A plastic panel that extends the face
of a drive so that it covers a computer’s drive
bay opening. The bezel usually contains a drive-
activity LED. Also known as the faceplate.
CLEAN R OOM – An environmentally
controlled dust-free assembly or repair facility
in which hard disk drives are assembled or can
be opened for internal servicing.
BIT – Abbreviation for binary digit. A binary
digit may have one of two values—1 or 0. This
contrasts with a decimal digit, which may have
a value from 0 to 9. A bit is one of the logic 1or
logic 0 binary settings that make up a byte of
data. (See also byte.)
CMOS – Acronym for complementary metal
oxide semiconductor. A low-power, low-heat,
high-density semiconductor.
COMMAND QUEUE – The queue used to
store I/ O processes.
BLOCK – In UNIX workstation
CONNECT – The initiator function that
selects a target to establish a nexus and to start
an I/ O process. The connection that results is
an initial connection.
environments, the smallest contiguous area that
can be allocated for the storage of data. UNIX
blocks are generally 8 Kbytes (16 sectors) in size.
In DOS environments, the block is referred to
as a cluster. (Note: This usage of the term block
at the operating system level is different from its
meaning in relation to the physical
CONNECTION – An initial connection or
reconnection that can occur only between one
initiator and one target.
configuration of the hard drive. See sector for
comparison.)
CONTINGENT ALLEGIANCE – A
condition generated by a CHECK
CONDITION or
BPI – Bits Per Inch. A measure of how densely
information is packed on a storage medium.
(See also FCI.)
COMMAND TER MINATED status during
which execution of all tagged I/ O processes (for
the associated I_T_X nexus) are suspended until
the condition is cleared. A target preserves an
I_T_X nexus until it is cleared by a hard or soft
reset, an abort message or another command for
that I_T_X nexus. While the contingent
allegiance condition exists, the target maintains
sense data for the initiator.
BUFFER – An area of R AM reserved for
temporary storage of data that is waiting to be
sent to a device that is not yet ready to receive
it. The data is usually on its way to or from the
hard disk drive or some other peripheral device.
BUS – The part of a chip, circuit board, or
interface designed to send and receive data.
CLUSTER – In DOS environments, the
smallest contiguous area that can be allocated
for the storage of data. DOS clusters are usually
2 Kbytes (4 sectors) in size.
BYTE – The basic unit of computer memory,
large enough to hold one character of
alphanumeric data. Comprised of eight bits.
(See also bit.)
CONTR OLLER – The chip or circuit that
translates computer data and commands into a
form suitable for use by the hard drive. Also
known as disk controller.
CACHE – Specialized High-speed R AM used
to optimize data transfers between system
elements with different performance
characteristics, e.g., disk to main memory or
main memory to CPU.
CONTR OLLER CAR D – An adapter
containing the control electronics for one or
more hard disks. Usually installed in a slot in the
computer.
CPU – Central Processing Unit. The
microprocessor chip that performs the bulk of
data processing in a computer.
CAPACITY – The amount of information that
can be stored on a hard drive. Also known as
storage capacity. (See also formatted capacity.)
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Glossary
CR C – Cyclic R edundancy Check. An error
detection procedure that identifies incomplete
or faulty data in each sector.
DMA – Direct Memory Access. A process for
transferring data directly to and from main
memory, without passing through the CPU.
DMA improves the speed and efficiency by
allowing the system to continue processing
even while new data is being retrieved.
CYLINDER – When disks are placed directly
above one another along the shaft, the circular,
vertical “slice” consisting of all the tracks
located in a particular position.
DOS – Disk Operating System. The most common
operating system used in IBM PCs. Manages all ac-
cess to data on the disk.
DR IVE – Short form of disk drive.
DATA SEPAR ATOR – The circuit that
extracts data from timing information on drives
that store a combined data and clock signal.
DR IVE GEOMETR Y – The functional
dimensions of a drive, including the number of
heads, cylinders, and sectors per track. (See also
logical format.)
DEDICATED SER VO – A positioning
mechanism using a dedicated surface of the disk
that contains timing and positioning
information only, as compared to surfaces that
are also used for data. (See also embedded servo.)
ECC – Error Correction Code. The
incorporation of extra parity bits in transmitted
data in order to detect errors that can be
corrected by the controller.
DEFECT MANAGEMENT – A technique
ensuring long-term data integrity. Consists of
scanning disk drives both at the factory and
during regular use, de-allocating defective
sectors before purchase and compensating for
new defective sectors afterward.
EDC – Abbreviation for error detection code.
An end-to-end cyclic redundancy code that is
used to protect data from errors that may be
introduced by the connecting busses, the disk
controller chip, the data cache, or the SCSI
interface in a disk drive. See also, CR C.
DIFFER ENTIAL TERMINATION – One of
two methods for terminating the SCSI bus,
characterized by a two-line signal: a (+) signal
and a (-) signal. Used to improve noise
resistance when long bus cables are required.
See also single-ended termination.
ELECTR ONICS MODULE – The printed
circuit board containing the drive electronics.
EMBEDDED SER VO – A timing or location
signal placed on tracks that store data. These
signals allow the actuator to fine-tune the
position of the read/ write heads.
DISK – In general, any circular-shaped data-
storage medium that stores data on the flat
surface of the platter. The most common type
of disk is the magnetic disk, which stores data as
magnetic patterns in a metal or metal-oxide
coating. Magnetic disks come in two forms:
floppy and hard. Optical recording is a newer
disk technology that gives higher capacity
storage but at slower access times.
ENCODING – The conversion of data into a
pattern of On/ Off or 1/ 0 signals prior to being
written on the disk surface. (See also RLL and
MFM.)
EPR OM – Erasable Programmable R ead-Only
Memory. An integrated circuit memory chip
that can store programs and data in a non-
volatile state. These devices can be erased by
ultraviolet light and reprogrammed with new
data.
DISK CONTROLLER – A plug-in board, or
embedded circuitry on the drive, that passes
information to and from the disk. The Maxtor
hard disk drives all have controllers embedded
on the drive printed-circuit board. (See also
controller.)
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Glossary
EXTENDED CONTINGENT
of disk surface. The number is usually stated as
flux changes per inch (FCI), with typical values
in the thousands. (See also FCI.)
ALLEGIANCE – A condition generated by a
target and announced with a INITIATE
R ECOVERY message. The mode is used
when multi-step extended error recovery
procedures are required to prevent interference
as from other initiators in a multi-initiator
system. See also contingent allegiance.
FLYING HEIGHT – The distance between
the read/ write head and the disk surface, made
up of a cushion of air that keeps the two objects
from touching. Smaller flying heights permit
denser data storage but require more precise
mechanical designs. Also known as fly height.
EXTERNAL DR IVE – A drive mounted in an
enclosure separate from the computer system
enclosure, with its own power supply and fan,
and connected to the system by a cable.
FOR MAT – To write a magnetic track pattern
onto a disk surface, specifying the locations of
the tracks and sectors. This information must
exist on a disk before it can store data.
FOR MATTED CAPACITY – The amount of
room left to store data on a disk after writing
sector headers, boundary definitions, and
timing information during a format operation.
The size of a Maxtor drive is always expressed
in formatted capacity, accurately reflecting the
usable space required.
FALSE – R efers to the logical-zero (or
“negated”) state of a binary number. See also,
signal negation.
FAST SCSI – The SCSI protocol that governs
fast synchronous transfer. See also Synchronous
Transfer.
FOR M FACTOR – The industry standard that
defines the physical, external dimensions of a
particular device. For example, most Maxtor
hard disk drives use a 3 1/ 2-inch form factor.
FCI – Flux Changes per Inch. The number of
magnetic field patterns that can be stored on a
given area of disk surface, used as a measure of
data density. (See also BPI.)
FULL HEIGHT – Term used to describe a disk
that occupies the vertical space (3.250 inches) of
a full sized 5.25-inch drive. See also half height,
low profile.
FIELD – A logically related group of one or
more physically contiguous bits.
FILE SER VER – A computer that provides
network stations with controlled access to
shareable resources. The network operating
system is loaded on the file server, and most
shareable devices (disk subsystems, printers) are
attached to it. The file server controls system
security and monitors station-to-station
communications. A dedicated file server can be
used only as a file server while it is on the
network. A non dedicated file server can be
used simultaneously as a file server and a
workstation.
GIGABYTE (GB) –1 billion bytes. The total
accessible capacity varies depending on the
operating environment.
Glist – Abbreviation. When the drive
encounters a defective sector during regular use,
it adds the address of the sector to the Grown
Defect List (Glist). See also Plist.
FIR MWAR E – Permanent instructions and
data programmed directly into the circuitry of
read-only memory for controlling the operation
of the computer. Distinct from software, which
can be altered by programmers.
GUIDE R AILS – Plastic strips attached to the
sides of a hard disk drive in an IBM PC/ AT or
compatible computer so that the drive easily
slides into place.
FLUX DENSITY – The number of magnetic
field patterns that can be stored in a given length
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Glossary
basic configurations. (See also low-level
formatting.)
HALF-HEIGHT – Standard drive size
equivalent to half the vertical space of a 5 1/ 4-
inch drive.
HOME – R eference track used for
recalibration of the actuator. Usually the
outermost track (track 0).
HAR D DISK – A type of storage medium that
retains data as magnetic patterns on a rigid disk,
usually made of an iron oxide or alloy over a
magnesium or aluminum platter. Because hard
disks spin more rapidly than floppy disks, and
the head flies closer to the disk, hard disks can
transfer data faster and store more in the same
volume.
HOST ADAPTER – A plug-in board that acts
as the interface between a computer system bus
and the disk drive.
HAR D ERR OR – A data error that persists
when the disk is re-read, usually caused by
defects in the physical surface.
INITIALIZATION – See low-level formatting.
INTER FACE – A hardware or software
protocol, (contained in the electronics of the
disk controller and disk drive) that manages the
exchange of data between the drive and
computer. The most common interfaces for
small computer systems are AT (also known as
IDE) and SCSI.
HAR D-SECTORED – The most common
method of indicating the start of each sector on
a disk, based on information located in the
embedded servo. This method is more precise
than soft-sectored techniques and results in
lower overhead. (See also soft-sectored.)
INTER LEAVE – The arrangement of sectors
on a track. The Interleave Factor is the number
of sectors that pass beneath the read/ write heads
before the next sector arrives. For example, a
3:1 interleave factor means that the heads read a
sector, then let two pass by before reading
another, requiring three full revolutions of the
disk to access the complete data track. Maxtor
drives have an interleave factor of 1:1, allowing
the system to access a full track of data in a single
revolution.
HEAD – The tiny electromagnetic coil and
metal pole used to create and read back
magnetic patterns on the disk. Also known as
read/ write head.
HEAD CR ASH – Damage to the read/ write
head, usually caused by sudden contact with the
disk surface. Head crash can also be caused by
dust and other particles.
INTER LEAVE FACTOR – The number of
sectors that pass beneath the read/ write heads
before the next numbered sector arrives. When
the interleave factor is 3:1, a sector is read, two
pass by, and then the next is read. It would take
three revolutions of the disk to access a full track
of data. Maxtor drives have an interleave of 1:1,
so a full track of data can be accessed within one
revolution of the disk, thus offering the highest
data throughput possible.
HEAD ASSEMBLY – The tiny
electromagnetic or magneto-resistive element
used to write and read back the magnetic
patterns of data on the recording media. See also
Diamond Head.
HEAD DISK ASSEMBLY (HDA) – The
assembly made up of the spindle motor, spindle,
head positioner (actuator), head preamp
electronics, and magnetic disk assembly.
INTER NAL DRIVE – A drive mounted
inside one of a computer’s drive bays, or a hard
disk on a card installed in one of the computer’s
expansion slots.
HIGH-CAPACITY DRIVE – By industry
conventions typically a drive of 100 megabytes
or more.
HIGH-LEVEL FOR MATTING – Formatting
performed by the operating system to create the
root directory, file allocation tables and other
I/ O PR OCESS – An I/ O process consists of an
initial connection (nexus) followed by zero or
more reconnections, all pertaining to a single
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Glossary
command or a group of linked commands. An
I/ O process normally ends with a BUS FR EE
phase following a COMMAND COMPLETE
or a R ELEASE RECOVER Y message.
LOW-LEVEL FOR MATTING – The process
of creating sectors on the disk surface so that the
operating system can access the required areas
for generating the file structure. Maxtor drives
are shipped with the low-level formatting
already completed. Also known as initialization.
LOW PROFILE – Describes drives built to the
3 1/ 2-inch form factor, which are only 1 inch
high. The standard form factor drives are 1.625
inches high.
JUMPER – A tiny box that slips over two pins
on a circuit board, connecting the pins
electrically. Some board manufacturers use
Dual In-Line Package (DIP) switches instead of
jumpers.
LPS – Low Profile Series.
LOW-VOLTAGE DIFFER ENTIAL (LVD)
— Is a differential bus technology that
combines much of the bus length, noise,
immunity, and performance benefits to
conventional differential SCSI with the power
consumption and cost of single-ended SCSI
Interfaces. Ultra2 SCSI (LVD) increase bus data
rates to 80 Mbytes/ sec, provides differential
data integrity, extends the SCSI bus cable
length to 12 meters, and provides easy system
configuration for up to 15 peripherals.
KILOBYTE (K) – A unit of measure consisting
of 1,024 (210) bytes.
LANDING ZONE – A non-data area on the
disk’s inner cylinder where the heads can rest
when the power is off.
LATENCY – The time during which the read/
write heads wait for the data to rotate into
position after the controller starts looking for a
particular data track. If a disk rotates at 3,600
rpm, the maximum latency time is 16.4
milliseconds, and the average latency time is 8.2
milliseconds.
MB – See megabyte.
MAGNETO-RESISTIVE – A unique
characteristic of some metals, which, when
combined, yields a variable electrical resistance
to varying magnetic fluxes. The resistance varies
directly with the strength of the flux, field, not
simply to a change in flux as with magneto-
inductance.
LBA – Abbreviation for Logical Block Address.
A sequentially-numbered identity of a multi-
byte block of user data. It does not refer directly
to the physical location of the data in a disk
drive.
MEDIA – The magnetic film that is deposited
or coated on an aluminum substrate which is
very flat and in the shape of a disk. The media
is overcoated with a lubricant to prevent
damage to the heads or media during head take
off and landing. The media is where the data is
stored inside the disk in the form of magnetic
flux or polarity changes.
LOGICAL FORMAT – The logical drive
geometry that appears to the computer system
BIOS as defined by the drive tables and stored
in CMOS.
LOGICAL UNIT – A physical or virtual
MEGABYTE (MB) – A unit of measurement
equal to 1,000 kilobytes, or 1,024,000 bytes.
(See also kilobyte.)
peripheral device addressable through a target.
LOOK AHEAD – The process of anticipating
events in order to speed up computer
operations. For example, the system can buffer
data into cache R AM by reading blocks in
advance, preparing the system for the next data
request.
MEGAHER TZ – A measurement of frequency
in millions of cycles per second.
MHz – See megahertz.
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Glossary
MICR OPR OCESSOR – The integrated
circuit chip that performs the bulk of data
processing and controls the operation of all of
the parts of the system. A disk drive also
contains a microprocessor to handle all of the
internal functions of the drive and to support
the embedded controller.
OVER HEAD – Command overhead refers to the
processing time required by the controller, host
adapter, or drive prior to the execution of a
command. Lower command overhead yields
higher drive performance. Disk overhead refers
to the space required for non-data information
such as location and timing. Disk overhead
often accounts for about ten percent of drive
capacity. Lower disk overhead yields greater
disk capacity.
MICR OSECOND (µs) – One millionth of a
second (.000001 sec.).
MILLISECOND (ms) – One thousandth of a
second (.001 sec.).
OVER WR ITE – To write data on top of
existing data, erasing it.
MTBF – Mean Time Between Failure.
R eliability rating indicating the failure rate
expected of a product expressed in power on
hours (POH). Since manufacturers differ in the
ways they determine the MTBF, comparisons
of products should always take into account the
MTBF calculation method.
OXIDE – A metal-oxygen compound. Most
magnetic coatings are combinations of iron or
other metal oxides, and the term has become a
general one for the magnetic coating on tape or
disk.
MTTR – Mean Time To R epair. The average
time it takes to repair a drive that has failed for
some reason. This only takes into consideration
the changing of the major sub-assemblies such
as circuit board or sealed housing. Component
level repair is not included in this number as this
type of repair is not performed in the field.
PAR ITY – An error checking technique
wherein the sum of the bits in a data byte is used
to set or reset an extra parity bit, depending on
whether the sum is an odd or an even number.
A second parity check after the data is
transferred to a new location checks that the
new parity bit matches the transferred bit. Parity
checking can only detect an odd number of bit
errors (1,3,5, etc.). Parity is defined as odd or
even, depending on which condition (odd or
even) is used to set the parity bit.
.NANOSECOND (ns) – One billionth of a
second (0.000 000 001 second or 10-9 second).
PAR KING ZONE – A position in a non-data
area on a disk platter reserved for resting the
heads when power is off. Using this area
prevents the heads from touching the surface in
data areas upon power down, adding to the data
integrity and reliability of the disk drive. The
parking zone is most often inside the disk's
inner-most cylinder.
NEXUS – A relationship between two devices
that begins with the establishment of an initial
connection and ends with the completion of an
I/ O process. A nexus relationship is further
defined by the letters I (initiator), T (target), L
(logical unit), R (target routine), x (either L or
R ), Q (queue tag), and x_y (either an x or a Q)
PAR TITION – A portion of a hard disk
dedicated to a particular operating system and
application and accessed as a single logical
volume.
PER FOR MANCE – A measure of the speed
of the drive during normal operation. Factors
affecting performance are seek times, transfer
rate and command overhead.
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Glossary
PER IPHER AL – A device added to a system as
an enhancement to the basic CPU, such as a
disk drive, tape drive or printer.
R AM – R andom Access Memory. An
integrated circuit memory chip that allows
information to be stored and retrieved by a
microprocessor or controller. The information
may be stored and retrieved in any order, and all
storage locations are equally accessible.
PHYSICAL FORMAT – The actual physical
layout of cylinders, tracks, and sectors on a disk
drive.
PHYSICAL SECTOR –See sector, data.
R AM DISK – A “phantom” disk drive created
by setting aside a section of R AM as if it were a
group of regular sectors. Access to R AM disk
data is extremely fast, but is lost when the
system is reset or turned off.
PLATTER – Common term referring to the
hard disk.
POH – Power On Hours. The unit of
measurement for Mean Time Between Failure
as expressed in the number of hours that power
is applied to the device regardless of the amount
of actual data transfer usage. (See also MTBF.)
R EAD – The function of detecting, processing
and transmitting data that has been recorded
(written) on a magnetic disk or some other
media.
POSITIONER – See actuator.
R EAD AFTER WRITE – A mode of
operation requiring that the system read each
sector after data is written, checking that the
data read back is the same as the data recorded.
This operation lowers system speed but raises
data reliability.
PR EFETCH –The technique of buffering data
into cache RAM by reading subsequent blocks
in advance to anticipate the next request for
data. Prefetch speeds up disk accesses to
sequential blocks of data.
R EAD VER IFY – A data accuracy check
performed by having the disk read data to the
controller, which then checks for errors but
does not pass the data on to the system.
PR ML – Partial-R esponse Maximum-
Likelihood. A sophisticated data-detection
method that improves data throughput and
increases areal density. PRML read channels are
used in place of peak-detection read channels.
R EAD/ WR ITE HEAD – The tiny
electromagnetic coil and metal pole piece used
to create and read back the magnetic patterns
(write or read information) on the disk. Each
side of each platter has its own read/ write head.
QUEUE – A prioritized list or set of processes.
A queue may be a FIFO (first-in, first-out),
LIFO (last-in, first -out) or a random-access
entity.
R ECONNECT – The act of reviving a nexus
to continue an I/ O process. An initiator
reconnects to a target using the SELECTION
and MESSAGE OUT phases after winning
arbitration. The target reconnects to the
initiator using R ESELECTION and
QUEUE TAG – The value associated with an
I/ O process that uniquely identifies it from
other queued I/ O processes in the logical unit
from the same initiator.
MESSAGE IN phases after winning arbitration.
R ECONNECTION – The state which results
from a reconnect. It exists from the assertion of
BSY in the SELECTION or RESELECTION
phase and lasts until the next BUS FR EE phase.
QUEUED I/ O PROCESS – An I/ O process
that is in the command queue.
R EMOVABLE DISK – Generally said of disk
drives where the disk itself is meant to be
removed, and in particular of hard disks using
disks mounted in cartridges. Their advantage is
G-8
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Glossary
that multiple disks can be used to increase the
amount of stored material, and that once
removed, the disk can be stored away to
prevent unauthorized use.
SCAM-1 – SCSI Configured Automatically. A
plug-and-play method used in some drives.
SCSI – Small Computer System Interface. An
interface designed for Apple Macintosh systems
and UNIX workstations.
R LL – Abbreviation for Run Length Limited.
An advanced method used to encode (or
compress) data for storage on a disk. RLL
encoding stores almost 50 percent more data
than MFM (Modified Frequency Modulation).
R LL code improves MFM code by encoding
data bits in groups rather than singly. Many
encoding schemes are possible. The best
achieve optimum values of code rates, clocking,
power spectrum, error propagation and
encoding complexity. A number pair (e.g., 1,7)
is usually stated with R LL references. It refers to
the minimum number of 0;s(1) and the
maximum number of 0's (7) that can separate
data 1's stored on the disk.
SCSI-1 – The first small computer system
interface standard.
SCSI-2 – An enhanced small computer system
interface as defined and published by ANSI in
standard X3.131-1994. One of the major
features of SCSI-2 is integrating the controller
into the peripheral device, making the device
independent of the initiator.
SCSI-3 – A new set of related ANSI standards
are currently under development by the X3T10
committee. The old SCSI-2 standard has been
divided into a new set of standards for SCSI-3.
Some of these [working draft] standards are:
R OM – R ead-Only Memory. Integrated
circuit memory chip containing programs that
can be accessed and read but can not be
modified.
SAM (SCSI Architecture Model) for the
architecture;
R OTAR Y ACTUATOR – The rotary
actuator replaces the stepper motor used in the
past by many hard disk manufacturers. The
rotary actuator is perfectly balanced and rotates
around a single pivot point. It allows closed-
loop feedback positioning of the heads, which is
more accurate than stepper motors.
SBC (SCSI Block Commands) for the disk
drive specific command set.
SPC (SCSI Primary Commands) for the
primary command set; and
SIP (SCSI Interlocked Protocol) for the
protocol layer;
R OTATIONAL LATENCY – The delay
between when the controller starts looking for
a specific block of data on a track and when that
block rotates around to where it can be read by
the read/ write head. On average, it is half of the
time needed for a full rotation (about 8 ms.).
SPI (SCSI Parallel Interface) for the physical
layer;
Layering the standards documents in this
manner allows substitution of parts of the
structure as new technology arrives.
SCSI ADDR ESS – The unique address
assigned to a SCSI bus device. Normally, the
address is assigned and set during system
installation with priority being a consideration.
A SCSI address is a value of 0 to 7 (or 0 to 15
for “wide” SCSI).
SCA – Single Connector Attachment. A drive
connector that combines the signal and power
connectors into one. Typically, SCA-type
connectors are used in RAID (R edundant
Array of Inexpensive Devices) systems.
SCSI BUS – A multi-signal parallel bus that
interconnects SCSI devices in a daisy-chain
fashion.
SCA-2 – An improved Single Connector
Attachment that incorporates two electrostatic
discharge (ESD) pins on either end of the
connector to improve safety when making a
connection.
SCSI DEVICE – A host adapter or a target
controller that can be attached to the SCSI bus.
Maxtor Atlas 10K III 18/36/73 GB Ultra160 SCSI
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Glossary
SCSI ID – The bit-significant representation of
the SCSI address referring to one of eight (or
one of sixteen) data lines.
SER VO SUR FACE – A separate surface
containing only positioning and disk timing
information but no data.
SECTOR – On a PC hard drive, the minimum
segment of track length that can be assigned to
store information. On Macintosh and UNIX
drives, sectors are usually grouped into blocks
or logical blocks that function as the smallest
data unit permitted. Since these blocks are often
defined as a single sector the terms block and
sector are sometimes used interchangeably in
this context. (Note: The usage of the term
block in connection with the physical
SETTLE TIME – The interval between the
arrival of the read/ write head at a specific track,
and the lessening of the residual movement to a
level sufficient for reliable reading or writing.
SHOCK R ATING – A rating, expressed in
“G’s”, of how much shock a disk drive can
sustain without damage.
SIGNAL ASSER TIOn – The act of driving a
signal to the true (logical-one) state. An asserted
signal on the SCSI bus is a low voltage resulting
from driving a transistor ON.
configuration of the disk is different from its
meaning at the system level. See also block and
cluster for comparison.)
SEEK – A movement of the disk read/ write
SIGNAL NEGATION – The act of driving a
signal to the false (0) state, or allowing the cable
terminators to bias the signal to the false state by
placing the data driver in the high impedance
(off) condition. A negated signal on the SCSI
bus is a high voltage resulting from all OR -tied
transistors being OFF.
head to a specific data track.
SEGMENTED CACHE BUFFER – A cache
buffer that is organized into multiple track lines.
Segmenting the cache allows track data to be
saved in separate segments when the head is
switched rather than having to erase the entire
cache. Segmenting the cache enables command
reordering on a more efficient track-basis rather
than on a command-basis.
SIGNAL RELEASE – The act of allowing the
cable terminators to bias the signal to the false
state by placing the bus driver in the high
impedance (off) condition.
SENSE DATA – Information returned to an
initiator regarding error conditions in the drive.
SINGLE-ENDED TER MINATION – One
of two methods for terminating the SCSI bus,
characterized by signal values that conform to
the ANSI-defined levels for SCSI
implementation. Typically used for short cable
runs. See also differential termination.
SERVO SECTOR TIME – The time (in µsec)
between reading one servo header (or “spoke”)
and reading the next header.
SERVO SPOKE DATA – In embedded servo
technology, digital and quadrature analog servo
data is written (embedded) in multiple headers
(or “spokes”) on each track on the data-
recording area of each disk surface. The digital
portion of the spoke data are read and used to
locate the correct track, spoke, and head
number. The quadrature analog signal portion
is detected and used by a servo feedback control
loop to precisely position the head on the track
center.
SKEW – To shift sector addresses when
switching tracks or cylinders to create a slight
overlap under the read/ write heads. The
overlap works to delay the arrival of the next (in
sequence) sector from arriving under the
selected head until the track or cylinder switch
has been done. Skewing minimizes latency time
(increasing data throughput) when data on the
drive is accessed sequentially.
S.M.A.R .T. – Self-Monitoring and Analysis
R eporting Technology. The continual
monitoring of the drive's operating condition
with reports sent to the host computer. Similar
to Maxtor's EWS (Early Warning System) used
in some drives.
SERVO DATA – Magnetic markings written
on the media that guide the read/ write heads to
the proper position.
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Glossary
SOFT ER R OR – A faulty data reading that
does not recur if the same data is reread from the
disk, or corrected by ECC. Usually caused by
power fluctuations or noise spikes.
TAR GET – An SCSI device that performs an
operation requested by an initiator.
target routine – An I/ O process directed to a
SOFT-SECTOR ED – Old time-based method
of indicating the start of each sector on a disk.
Soft-sectored drives require that location
instructions be located in the data fields. (See
also hard-sectored.)
target and not to a logical unit.
THIN FILM – A type of coating allowing very
thin layers of magnetic material, used on hard
disks and read/ write heads. Hard disks with thin
film surfaces can store greater amounts of data.
SPINDLE – The drive’s center shaft, on which
the hard disks are mounted. A synchronized
spindle is a shaft that allows two disks to spin
simultaneously as a mirror image of each other,
permitting redundant storage of data.
THIR D-STR OKE SEEK – A method of
evaluating the power requirements of a hard
drive. It involves monitoring drive current
while seeking to a selected track, waiting for 1/
2 a revolution, then seeking to a track that is 1/
3 of the total actuator stroke from the first. The
seek/ wait cycle is usually repeated three times.
SPUTTER – A special method of coating the
disk that results in a hard, smooth surface
capable of storing data at a high density. Maxtor
disk drives use sputtered thin film disks.
TPI – Tracks Per Inch. The number of tracks
written within each inch of disk’s surface, used
as a measure of how closely the tracks are
packed on a disk surface. Also known as track
density.
STEPPER – A type of motor that moves in
discrete steps with each electrical pulse. Stepper
were originally the most common type of
actuator engine, since they can be geared to
advance a read/ write head one track per step.
However, they are not as fast, reliable, or
durable as the voice coil actuators found in
Maxtor disk drives. (See also voice coil.)
TR ACK – One of the many concentric
magnetic circle patterns written on a disk
surface as a guide for storing and reading data.
Also known as channel.
SUBSTR ATE – The material underneath the
magnetic coating of a disk. Common substrates
include aluminum or magnesium alloys for hard
drives, glass, for optical disks, and mylar for
floppy disks.
TR ACK DENSITY – How closely the tracks
are packed on a disk surface. The number is
specified as tracks per inch (TPI).
TR ACK-TO-TR ACK SEEK TIME – The
time required for the read/ write heads to move
to an adjacent track.
SUR FACE – The top or bottom side of a disk,
which is coated with the magnetic material for
recording data. On some drives one surface may
be reserved for positioning information.
TR ANSFER RATE – The rate at which the
disk sends and receives data from the controller.
The sustained transfer rate includes the time
required for system processing, head switches
and seeks, and accurately reflects the drive’s true
performance. The burst mode transfer rate is a
much higher figure that refers only to the
movement of data directly into R AM.
SYNCHR ONOUS DATA TR ANSFER –
Data transfer that allows transfer of multiple
blocks of data between request or
acknowledgment signals, since request and
acknowledgment signals need not be sent
before and after each block. This method is
faster than asynchronous data transfer.
TR UE – R efers to the logical-one (or
“asserted”) state of a binary number. See also,
signal assertion.
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Glossary
unformatted capacity – The total number of
VOICE COIL – A fast and reliable actuator
motor that works like a loud speaker, with the
force of a magnetic coil causing a proportionate
movement of the head. Voice coil actuators are
more durable than their stepper counterparts,
since fewer parts are subject to daily stress and
wear. Voice coil technology is used in all
Maxtor drives.
bytes of data that can be put on a disk drive.
Formatting the disk requires approximately
20% of this space to record servo data, addresses,
boundary definitions, and timing information.
After formatting, user data can be stored on the
remaining disk space, known as the formatted
capacity.
wide SCSI – SCSI protocol permits wide data
ULTRA SCSI– Doubles the bandwidth of
SCSI Fast. it provides 8-bit (SCSI NAR ROW)
data rates of 20 Mbytes per second and 16-bit
(SCSI Wide) data rates of 40 Mbytes per
second. Shorter cables may be required. Also
known as Fast-20.
transfers of 16 or 32 bits.
wide data transfer – Data transfer that allows
information transfer across 16 (or future 32)
bits. Faster than standard 8-bit data transfer.
WEDGE SERVO – The position on every
track that contains data used by the closed loop
positioning control. This information is used to
fine tune the position of the read/ write heads
exactly over the track center.
UNFORMATTED CAPACITY – The total
number of usable bytes on a disk, including the
space that will be required to later to record
location, boundary definitions, and timing
information. (See formatted capacity for
comparison.)
WINCHESTER DISKS – Former code name
for an early IBM hard disk model, sometimes
still used to refer to hard drives in general.
WR ITE – The operation of recording or
storing data on a magnetic or other media. See
also, read.
WR ITE ONCE – An optical disk technology
that allows the drive to store and read back data,
but prevents the drive from erasing information
once it has been written.
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4-pin DC power connector 3-21
abbreviations 1-2
acoustics 4-7
actuator 4-6
Adapter, 50-pin to 68-pin 2-4
Additional Sense Length 5-136
air temperature 3-25
altitude2 4-8
clearance 3-24
Command Queuing 5-22
component life 4-10
Connect Time Limit 5-50
contact start/ stop cycles 4-2
Contingent Allegiance Condition 5-7
cooling fan requirements 3-25
ASCII Implemented Operating Definition
ASCII Implemented Operating Definition
Page 5-26
audience definition 1-1
auto head-park method 4-2
average write 4-2
Bit Pointer 5-153
buffer size 4-2
Bus Inactivity Limit 5-50
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Index
disks 4-1
DOS 4-3
Drive Step R ate 5-80
drop 4-10
hard reset time 4-4
hardware options 3-6
hardware requirements 2-4
Head Offset Count 5-49
hot plugging 6-11
humidity 4-8
idle 4-6
encoding method 4-1
Ending Boundary 5-59
environmental conditions 4-8
error correction method 4-2
error type 4-11
Implemented Operating Definition Page
input power connections 3-21
inside zone 4-1
ESD 3-4
Extent List Length 5-155
interface connector 3-15
Interleave 5-79
faceplate 3-3
Field Pointer Bytes 5-153
Format Device Page 5-78
Jumper Configurations and Connections
(16-bit Drives) 3-6
jumpers 3-7
full stroke 4-4
key features 2-1
general 2-1
Landing Zone Cylinder 5-80
Log Pages 5-37
I-2
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Index
low 4-3
low-level format 4-3
orientation 3-23
manual organization 1-1
mating connectors 3-21
Maximum Burst Size 5-50
maximum effective areal density 4-2
maximum number of errors 4-11
maximum screw torque 3-24
maximum specifications 4-4
packing assembly 3-5
packing materials 3-4
Page Length 5-39
Parameter Code R eset 5-36
Parameter Pointer 5-38
Parameter Pointer Control 5-38
PCBA 3-24
Mode Data Length 5-76
Mode Page Types 5-43
Mode Parameter Block Descriptor 5-45
Mode Parameter List 5-44
Mounting 3-25
performance 2-2
Peripheral Device 5-21
Physical Block Data 5-176
pin assignments 3-22
PM 4-10
power down 4-5
power on 4-4
power requirements 4-6
multiple drive shipments 3-5
printed circuit board 3-7
product overview 2-1
Progress Indication Bytes 5-133
naming conventions 1-3
Notch and Partition Page 5-58
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Index
Quantum Manufacturing Information
Page 5-30
Quantum Special Function Control Page
rotational speed 4-1
Queue Algorithm Modifier 5-57
Sense Data Availability 5-133
Sense Keys 5-137
recording technology 4-1
references 1-3
Standard Inquiry Data Page 5-21
Starting Boundary 5-59
Status R eporting 5-134
Status/ Error R eporting 5-6
R emote Busy and Fault Displays (16-bit
Drives, except SCA) 3-9
R esponse Data Format 5-22
R etry Count 5-153
I-4
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Index
Supported Diagnostics Pages Page 5-123
ventilation requirements 3-23
Verification Length 5-169
Verify Correction Span 5-52
Verify Error R ecovery 5-52
Verify Error R ecovery Page 5-52
Synchronous Data Transfer 5-22
temperature 4-8
terminology 1-2
vibration 4-10
Vital Product Data Pages 5-23
volt returns 3-21
total tracks 4-1
total user sectors 4-1
Track Skew Factor 5-79
WR ITE (10) Command 5-171
WR ITE (6) Command 5-170
WR ITE AND VER IFY Command 5-172
transferred data 4-4
transient voltages 4-5
Write R etry Count 5-49
typical specifications 4-4
typographical conventions 1-3
zones per surface 4-1
unrecoverable error rate 4-2
Vendor-Unique Caching Page 5-85
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Index
I-6
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