Fujitsu MAS3367FC User Manual

C141-E198-02EN  
MAS3735FC  
MAS3367FC  
DISK DRIVES  
PRODUCT/MAINTENANCE MANUAL  
Revision History  
(1/1)  
Revised section (*1)  
(Added/Deleted/Altered)  
Edition  
Date  
Details  
01  
02  
2003.07.29  
2003.10.07  
Capacity notation is changed.  
Misdescription is corrected.  
Table 2.1, 2.2 and 3.2 are altered.  
Table 2.3 is altered  
*1 Section(s) with asterisk (*) refer to the previous edition when those were deleted.  
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Preface  
This manual describes the MAS3735FC and MAS3367FC (hereafter, MAS series),  
3.5 type fixed disk drives with an embedded fibre channel controller.  
This manual details the specifications and functions of the above disk drive, and gives the  
requirements and procedures for installing it into a host computer system.  
This manual is written for users who have a basic understanding of fixed disk drives and  
their use in computer systems. The MANUAL ORGANIZATION section describes  
organization and scope of this manual. The need arises, use the other manuals.  
The organization of this manual, related reference manual and conventions for alert  
messages follow.  
Overview of Manual  
This manual consists of the following seven chapters, glossary, and abbreviation:  
Chapter 1 General Description  
This chapter introduces the MAS series disk drives and discusses their standard features,  
hardware, and system configuration.  
Chapter 2 Specifications  
This chapter gives detailed specifications of the MAS series disk drives and their  
installation environment.  
Chapter 3 Data Format  
This chapter describes the data structure of the disk, the address method, and what to do  
about media defects.  
Chapter 4 Installation Requirements  
This chapter describes the basic physical and electrical requirements for installing MAS  
series disk drives.  
Chapter 5 Installation  
This chapter explains how to install MAS series disk drives. It includes the notice and  
procedures for setting device number and operation modes, mounting the disk drive,  
connecting the cables, and confirming drive operation.  
Chapter 6 Diagnostics and Maintenance  
This chapter describes the automatic diagnosis, and maintenance of MAS series disk drive.  
This chapter also describes diagnostic methods for operation check and the basics of  
troubleshooting the disk drives.  
Chapter 7 Error Analysis  
This chapter describes in details how collect the information for error analysis and how  
analyze collected error information.  
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i
Preface  
APPENDIX A Connector Signal Allocation  
The appendix gives supplementary information, including the signal assignments of  
interface connectors.  
Conventions for Alert Messages  
This manual uses the following conventions to show the alert messages. An alert message  
consists of an alert signal and alert statements. The alert signal consists of an alert symbol  
and a signal word or just a signal word.  
The following are the alert signals and their meanings:  
This indicates a hazardous situation likely to result in  
serious personal injury if the user does not perform the  
procedure correctly.  
This indicates a hazardous situation could result in serious  
personal injury if the user does not perform the procedure  
correctly.  
This indicates a hazardous situation could result in minor  
or moderate personal injury if the user does not perform  
the procedure correctly. This alert signal also indicates  
that damages to the product or other property, may occur if  
the user does not perform the product correctly.  
This indicates information that could help the user use the  
product more efficiently.  
In the text, the alert signal is centered, followed below by the indented message. A wider  
line space precedes and follows the alert message to show where the alert message begins  
and ends. The following is an example:  
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Preface  
(Example)  
Data loss  
For MAS series, Reed Solomon codes are applied for their ECC. The  
sector-data is divided into 4 interleaving sectors, and ECC is performed in  
each sector where the maximum number of errors (up to 5 byte) can be  
corrected. [Total maximum byte: 5 byte × 4 ( interleave) = 20 byte]  
If the error of read sector keeps allowable error byte number, correction is  
performed. However, if error byte exceeds its allowable number,  
correction may not be performed properly.  
The main alert messages in the text are also listed in the “Important Alert Items.”  
CONVENTIONS USED IN THIS MANUAL  
The MAS3735FC and MAS3367FC disk drives are described as "the intelligent disk drive  
(IDD)", "the drive" or "the device" in this manual.  
Decimal number is represented normally.  
Hexadecimal number is represented as X'17B9', 17B9h or 17B9H.  
Binary number is represented as "010".  
Attention  
Please forward any comments you may have regarding this manual.  
To make this manual easier for users to understand, opinions from readers are needed.  
Please write your opinions or requests on the Comment at the back of this manual and  
forward it to the address described in the sheet.  
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Important Alert Items  
Important Alert Messages  
The important alert messages in this manual are as follows:  
A hazardous situation could result in minor or moderate personal injury if the  
user does not perform the procedure correctly. Also, damage to the product  
or other property, may occur if the user does not perform the procedure  
correctly.  
Task  
Alert message  
Page  
2-5  
Data loss  
Mounting Installation  
For MAS series, Reed Solomon codes are applied for their ECC.  
The sector-data is divided into 4 interleaving sectors, and ECC is  
performed in each sector where the maximum number of errors (up  
to 5 byte) can be corrected. [Total maximum byte: 5 byte × 4  
(interleave) = 20 byte]  
If the error of read sector keeps allowable error byte number,  
correction is performed.  
However, if error byte exceeds its allowable number, correction  
may not be performed properly.  
Hot temperature  
5-1  
To prevent injury, do not handle the drive until after the device has  
cooled sufficiently after turning off the power. The DE and LSI  
become hot during operation and remain hot immediately after  
turning off the power.  
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Important Alert Items  
Task  
Alert message  
Page  
5-5  
Mounting Installation  
Damage  
1. When dismounting the drive which is mounted on the system  
while power is supplied to it.  
The drive to be dismounted must be separated from the  
loop. Dismounting the drive which is not separated from  
the loop may cause an unexpected error.  
If the drive is not separated from the loop, issue an LPB to  
the drive from the initiator in a primitive sequence of the  
order set.  
It is recommended to stop the spindle motor prior to this  
loop separation operation. The spindle motor can be  
stopped by a START/STOP command. It takes about 30  
seconds for the spindle motor to stop completely.  
Then, dismount the drive using the drive  
mounting/dismounting mechanism, etc. of the system. If  
the drive is dismounted while the spindle motor is running,  
special care is required to avoid excessive vibration or  
shock to the drive. It is recommended to stop the operation  
once the SCA connector breaks off contact and wait until  
the spindle motor stops (about 30 seconds) before dismount  
the drive.  
When storing or transporting the drive, put it in an  
antistatic bag. (Shown in Section 5.1).  
2. When dismounting the drive which is mounted on the system  
while power is not supplied to it.  
Do not move the drive until the drive stops completely  
(about 30 seconds if the spindle motor was stopped by a  
START/STOP UNIT command, and about 30 seconds after  
powering-off when the power was simply turned off).  
Then, dismount the drive using the drive  
mounting/dismounting mechanism, etc. of the system.  
When storing or transporting the drive, put it in an  
antistatic bag. (Shown in Section 5.1).  
Data loss  
6-4  
6-5  
When the SEND DIAGNOSTIC command terminates with the  
CHECK CONDITION status, the INIT must collect the error  
information using the REQUEST SENSE command. The RECEIVE  
DIAGNOSTIC RESULTS command cannot read out the error  
information detected in the self-diagnostics.  
Caution  
1. To avoid injury, do not touch the mechanical assembly during  
disk drive operation.  
2. Do not use solvents to clean the disk drive.  
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Important Alert Items  
Task  
Alert message  
Page  
6-6  
Mounting Installation  
Caution  
1. Always ground yourself with a wrist strap connected to ground  
before handling. ESD (Electrostatics Discharge) may cause  
the damage to the device.  
2. Do not remove a PCA. This operation is required to prevent  
unexpected or unpredictable operation.  
3. Do not use a conductive cleaner to clean a disk drive assembly.  
Damage  
6-6  
6-7  
Never open the disk enclosure in the field. Opening the disk  
enclosure in the field may cause an irreparable fault.  
Data loss  
Save data stored on the disk drive before requesting repair. Fujitsu  
does not assume responsibility if data is destroyed during servicing  
or repair.  
Damage  
6-15  
Never open the disk enclosure in the field. Opening the disk  
enclosure may cause an irreparable fault.  
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MANUAL ORGANIZATION  
PRODUCT/  
MAINTENANCE MANUAL  
1. General Description  
2. Specifications  
3. Data Format  
(This manual)  
4. Installation Requirements  
5. Installation  
6. Diagnostics and Maintenance  
7. Error Analysis  
Fibre Channel  
Interface  
Specifications  
1. Command Processing  
2. Data Buffer Management  
3. Command Specification  
4. Sense Data and error Recovery Procedure  
5. Disk Medium Management  
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ix  
REFERENCED STANDARDS  
The product specifications and functions described in this manual conform to the  
following ANSI (*1) standards:  
Document number  
Title  
NCITS TR-19  
FIBRE CHANNEL PRIVATE LOOP SCSI DIRECT ATTATH (FC-PLDA)  
FIBRE CHANNEL PHYSICAL AND SIGNALING INTERFACE (FC-PH)  
FIBRE CHANNEL PHYSICAL AND SIGNALING INTERFACE-2 (FC-PH-2)  
FIBRE CHANNEL ARBITRATED LOOP (FC-AL)  
ANSI X3.230-1994  
ANSI X3.297-1996  
ANSI X3.272-199X  
ANSI X3.269-199X  
FIBRE CHANNEL PLOTOCOL FOR SCSI (SCSI-FCP)  
*1 ANSI = American National Standards Institute  
In case of conflict between this manual and any referenced document, this manual takes precedence.  
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CONTENTS  
CHAPTER 1 General Description ..................................................................1-1  
1.1 Standard Features....................................................................................1-2  
1.2 Hardware Structure .................................................................................1-5  
1.3 System Configuration..............................................................................1-7  
CHAPTER 2 Specifications............................................................................2-1  
2.1 Hardware Specifications .........................................................................2-1  
2.1.1 Model name and order number.............................................................2-1  
2.1.2 Function specifications .........................................................................2-2  
2.1.3 Environmental specifications................................................................2-4  
2.1.4 Error rate ...............................................................................................2-5  
2.1.5 Reliability..............................................................................................2-5  
CHAPTER 3 Data Format ...............................................................................3-1  
3.1 Data Space...............................................................................................3-1  
3.1.1 Cylinder configuration..........................................................................3-1  
3.1.2 Alternate spare area...............................................................................3-4  
3.1.3 Track format..........................................................................................3-5  
3.1.4 Sector format.........................................................................................3-7  
3.1.5 Format capacity.....................................................................................3-9  
3.2 Logical Data Block Addressing ..............................................................3-9  
3.3 Defect Management ..............................................................................3-11  
3.3.1 Defect list ............................................................................................3-11  
3.3.2 Alternate block allocation...................................................................3-11  
CHAPTER 4 Installation Requirements ........................................................4-1  
4.1 Mounting Requirements..........................................................................4-1  
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Contents  
4.1.1 External dimensions ..............................................................................4-1  
4.1.2 Mounting ...............................................................................................4-3  
4.1.3 Notes on mounting ................................................................................4-3  
4.2 Power Supply Requirements ...................................................................4-7  
4.3 Connection Requirements .......................................................................4-9  
4.3.1 Connector ..............................................................................................4-9  
4.3.2 Interface connector................................................................................4-9  
CHAPTER 5 Installation................................................................................. 5-1  
5.1 Notes on Handling Drives .......................................................................5-1  
5.2 Setting......................................................................................................5-3  
5.2.1 Loop ID setting......................................................................................5-3  
5.2.2 Mode settings ........................................................................................5-3  
5.3 Mounting Drives......................................................................................5-4  
5.3.1 Mounting procedures.............................................................................5-4  
5.4 Dismounting Drives.................................................................................5-5  
5.5 Checking Operation after Installation and Preparing the IDD for Use...5-6  
5.5.1 Checking initial operation.....................................................................5-6  
5.5.2 Checking connection.............................................................................5-7  
5.5.3 Formatting ...........................................................................................5-10  
5.5.4 Setting parameters...............................................................................5-12  
5.6 Spare Disk Drive ...................................................................................5-16  
CHAPTER 6 Diagnostics and Maintenance.................................................. 6-1  
6.1 Diagnostics ..............................................................................................6-1  
6.1.1 Self-diagnostics .....................................................................................6-1  
6.1.2 Test programs........................................................................................6-4  
6.2 Maintenance Information ........................................................................6-5  
6.2.1 Precautions ............................................................................................6-5  
6.2.2 Maintenance requirements ....................................................................6-6  
6.2.3 Maintenance levels................................................................................6-8  
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6.2.4 Revision numbers..................................................................................6-9  
6.2.5 Tools and test equipment ....................................................................6-10  
6.2.6 Tests ....................................................................................................6-10  
6.3 Operation Check....................................................................................6-12  
6.3.1 Initial seek operation check ................................................................6-12  
6.3.2 Operation test ......................................................................................6-12  
6.3.3 Diagnostic test.....................................................................................6-12  
6.4 Troubleshooting Procedures..................................................................6-13  
6.4.1 Outline of troubleshooting procedures................................................6-13  
6.4.2 Troubleshooting with disk drive replacement in the field..................6-13  
6.4.3 Troubleshooting at the repair site .......................................................6-15  
6.4.4 Troubleshooting with parts replacement in the factory ......................6-16  
6.4.5 Finding possibly faulty parts...............................................................6-16  
CHAPTER 7 Error Analysis............................................................................7-1  
7.1 Error Analysis Information Collection ...................................................7-1  
7.1.1 Sense data..............................................................................................7-1  
7.1.2 Sense key, sense code, and subsense code............................................7-1  
7.2 Sense Data Analysis................................................................................7-3  
7.2.1 Error information indicated with sense data.........................................7-3  
7.2.2 Sense data (3-0C-03), (4-40-xx), (4-44-xx), and (4-C4-xx).................7-4  
7.2.3 Sense data (1-1x-xx), (3-1x-xx) and (E-1D-00): Disk read error........7-4  
7.2.4 Sense data (5-2x-xx), (5-3D-00), (B-47-xx), (B-49-00), (B-4D-xx) and  
(B-4E-00): fibre channel interface error ...............................................7-4  
APPENDIX A Connector Signal Allocation ................................................... A-1  
A.1 Interface (FC-SCA) Connector Signal Allocation................................. A-2  
Glossary ...........................................................................................................GL-1  
Abbreviation.....................................................................................................AB-1  
Index ................................................................................................................. IN-1  
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Contents  
Illustrations  
Figures  
Figure 1.1 FC model drives outer view........................................................1-5  
Figure 1.2 Disk/head configuration..............................................................1-6  
Figure 1.3 Example of FC-AL system configuration...................................1-7  
Figure 3.1 Cylinder configuration ................................................................3-2  
Figure 3.2 Spare area in cell.........................................................................3-5  
Figure 3.3 Alternate cylinder........................................................................3-5  
Figure 3.4 Track format................................................................................3-6  
Figure 3.5 Track skew/head skew ................................................................3-7  
Figure 3.6 Sector format...............................................................................3-7  
Figure 3.7 Alternate block allocation by FORMAT UNIT command .......3-12  
Figure 3.8 Alternate block allocation by REASSIGN  
BLOCKS command ..................................................................3-13  
Figure 4.1 External dimensions....................................................................4-2  
Figure 4.2 IDD orientations..........................................................................4-3  
Figure 4.3 Mounting frame structure............................................................4-4  
Figure 4.4 Limitation of side-mounting .......................................................4-4  
Figure 4.5 Surface temperature measurement points...................................4-5  
Figure 4.6 Service clearance area.................................................................4-6  
Figure 4.7 Current waveform (+12 VDC)....................................................4-7  
Figure 4.8 AC noise filter (recommended)...................................................4-8  
Figure 4.9 Connector location ......................................................................4-9  
Figure 4.10 SCA2 type connector ................................................................4-10  
Figure 5.1 Checking the IDD connection (A) ..............................................5-8  
Figure 5.2 Checking the IDD connection (B)...............................................5-9  
Figure 6.1 Revision label (example) ............................................................6-9  
Figure 6.2 Indicating revision numbers......................................................6-10  
Figure 6.3 Test flowchart............................................................................6-11  
Figure 7.1 Format of extended sense data....................................................7-2  
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Contents  
Tables  
Table 2.1 Model names and order numbers................................................ 2-1  
Table 2.2 Function specifications ............................................................... 2-2  
Table 2.3 Environmental/power requirements............................................ 2-4  
Table 3.1 Zone layout and track capacity................................................... 3-3  
Table 3.2 Format capacity........................................................................... 3-9  
Table 4.1 Surface temperature check point ................................................ 4-5  
Table 5.1 Motor start mode......................................................................... 5-3  
Table 6.1 Self-diagnostic functions ............................................................ 6-1  
Table 6.2 System-level field troubleshooting........................................... 6-14  
Table 6.3 Disk drive troubleshooting........................................................ 6-15  
Table 7.1 Definition of sense data .............................................................. 7-3  
Table A.1 FC-SCA connector: CN1 .......................................................... A-2  
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CHAPTER 1  
General Description  
1.1 Standard Features  
1.2 Hardware Structure  
1.3 System Configuration  
This chapter describes the feature and configuration of the MAS series intelligent disk drives (IDD).  
IDDs are high performance large capacity 3.5 type fixed disk drives with an embedded Fibre-Channel  
controller.  
The interface used to connect the MAS series disk drives to the host system complies with NCITS TR-19  
Fibre Channel Private Loop SCSI Direct Attach (FC-PLDA), which is the Fibre Channel PLDA standard  
covering items ranging from Fibre Channel physical layers to SCSI command protocols.  
The high-speed data transfer and long-distance transmission capabilities of Fibre Channel technology and the  
powerful command set of the MAS disk driver facilitate creation of high-performance and highly reliable disk  
subsystems with large storage capacities.  
The data format can be changed from the format at factory shipment by re-initializing with the use's system.  
Refer to the Fibre Channel Interface Specification.  
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1-1  
General Description  
1.1  
Standard Features  
(1)  
Compactness  
In a compact enclosure having the 3.5-inch HDD form factor, the IDD contains an FC-AL controller,  
which supports the Arbitrated Loop technology (FC-AL), a Fibre Channel technology defined by the  
related ANSI standard.  
(2)  
FC-AL standard  
The IDD provides not only FC-AL basic functions but also the following features:  
Arbitration  
Disconnection/Reconnection  
Data bus parity  
The SCSI commands can manipulate data through logical block addressing regardless of the physical  
characteristics of the disk drive. This allows software to accommodate future expansion of system  
functions.  
(3)  
(4)  
Dual-port support  
The IDD has two pairs of driver and receiver sets for the Fibre Channel to support dual-port  
connection.  
High-speed data transfer  
The maximum data-transfer speed on the Fibre Channel loop is 212.5 MB/s. The large-capacity data  
buffer of the IDD enables the effective use of such high-speed data transfers available on the Fibre  
Channel loop.  
(5)  
Continuous block processing  
The addressing method of data blocks is logical block address. The initiator can access data by  
specifying block number in a logically continuous data space without concerning the physical  
structure of the track or cylinder boundaries.  
The continuous processing up to [64K-1] blocks in a command can be achieved, and IDD can perform  
continuous read/write operation when processing data blocks on several tracks or cylinder.  
(6)  
Programmable multi-segment data buffer  
The data buffer is 32M bytes. Data is transferred between Fibre Channel Loop and disk media  
through this data buffer. This feature provides the suitable usage environment for users.  
Since the initiator can control the disconnect/reconnect timing on the Fibre Channel Loop by  
specifying the condition of stored data to the data buffer or empty condition of the data buffer, the  
initiator can perform the effective input/output operations with utilizing high data transfer capability  
of the Fibre Channel Loop regardless of actual data transfer rate of the disk drive.  
1-2  
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1.1 Standard Features  
(7)  
Cache feature  
After executing the READ command, the IDD reads automatically and stores (prefetches) the  
subsequent data blocks into the data buffer (Read-ahead caching).  
The high speed sequential data access can be achieved by transferring the data from the data buffer without  
reaccessing the disk in case the subsequent command requests the prefetched data blocks.  
The Write Cache feature is supported. When this feature is enabled, the status report is issued  
without waiting for completion of write processing to disk media, thereby enabling high speed write  
processing.  
When Write Cache is enabled, you should ensure that the cached data is  
surely flushed to the disc media before you turn off the drive's power.  
To ensure it, you should issue either the SYNCHRONIZE CACHE  
command or the STOP UNIT command with specifying “0” to the  
Immediate bit, and then confirm that the command is surely terminated  
with the GOOD STATUS.  
(8)  
Command queuing feature  
The IDD can queue maximum 128 commands, and optimizes the issuing order of queued commands  
by the reordering function. This feature realizes the high speed processing.  
(9)  
Reserve and release functions  
The IDD can be accessed exclusively in the multi-host or multi-initiator environment by using the  
reserve and release functions.  
(10)  
Enclosure service function  
The IDD supports the enclosure service interface (ESI), which complies with SFF-8067. The ESI  
interface enables use of the SCSI-3 enclosure service command set (SES) so that the functions that  
specify and read enclosure service information can be used.  
(11)  
Error recovery  
The IDD can try to recover from errors in Fibre Channel Loop or the disk drive using its powerful  
retry processing. If a recoverable data check occurs, error-free data can be transferred to the initiator  
after being corrected in the data buffer. The initiator software is released from the complicated error  
recover processing by these error recovery functions of the IDD.  
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1-3  
General Description  
(12)  
Automatic alternate block reassignment  
If a defective data block is detected during read or write the IDD can automatically reassign its  
alternate data block.  
(13)  
Programmable data block length  
Data can be accessed in fixed-block length units. The data block length is programmable, and can be  
specified at initializing with a multiple of four within the range of 512 to 528 bytes.  
Error rate increase  
1. The drive format at factory shipment is generally 512 bytes.  
2. The recoverable Error of the drive might increase when the format would  
be modified from 512 bytes to the following values:  
516 bytes, 520 bytes, 524 bytes, 528 bytes.  
3. The recoverable Error referred here is sense data (1-13-xx).  
(14)  
Defective block slipping  
A logical data block can be reallocated in a physical sequence by slipping the defective data block at  
formatting. This results in high speed contiguous data block processing without a revolution delay  
due to defective data block.  
(15)  
(16)  
High speed positioning  
A rotary voice coil motor achieves fast positioning.  
Large capacity  
A large capacity can be obtained from 3.5 type disk drives by dividing all cylinders into several  
partitions and changing the recording density on each partition (constant density recording). The disk  
subsystem with large capacity can be constructed in the good space efficiency.  
(17)  
(18)  
Start/Stop of spindle motor  
Using the SCSI command, the host system can start and stop the spindle motor.  
Diagnosis  
The IDD has a diagnostic capability which checks internal controller functions and drive operations  
to facilitate testing and repair.  
1-4  
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1.2 Hardware Structure  
(19)  
Low power consumption  
By using highly integrated LSI components, the power consumption of the IDD is very low, and this  
enables the unit to be used in wide range of environmental conditions.  
(20)  
(21)  
Low noise and low vibration  
The noise level is low; approx. 3.6 Bels Ready for MAS series. This makes it ideal for office use.  
Microcode downloading  
The IDD implements the microcode download feature. This feature achieves easy maintainability of  
the IDD and function enhancing.  
1.2  
Hardware Structure  
An outer view of the IDD is given in Figures 1.1. The IDD is composed of the disk, head, spindle  
motor, mounted disk enclosure (DE) with actuator and air circulation filter, as well as read/write pre-  
amp with the printed circuit assembly (PCA) of the controller.  
Figure 1.1 FC model drives outer view  
(1)  
Disks  
The disks have an outer diameter of 70 mm (2.8 inch) and an inner diameter of 25 mm (0.98 inch) for  
MAS series. The disks are good for at least 20,000 contact starts and stops. Each model contains  
following number of disks.  
MAS3735FC: 4  
MAS3367FC: 2  
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1-5  
General Description  
(2)  
Heads  
The MR (Magnet - Resistive) of the CSS (contact start/stop) type heads are in contact with the disks  
when the disks are not rotating, and automatically float when the rotation is started. Figure 1.2 shows  
the configuration of disks and heads  
MAS3735FC  
MAS3367FC  
Base  
0
1
0
1
2
3
4
5
6
7
2
3
Cover  
Figure 1.2 Disk/head configuration  
(3)  
(4)  
Spindle motor  
The disks are rotated by a direct-drive hall-less DC motor. The motor speed is controlled by a  
feedback circuit using the counter electromotive current to precisely maintain the specified speed.  
Actuator  
The actuator, which uses a rotary voice coil motor (VCM), consumes little power and generates little  
heat. The heads at the end of the actuator arm is controlled and positioned via feedback of servo  
information in the data.  
The heads are positioned on the CCS zone over the disks when the power is off or the spindle motor  
is stopped.  
(5)  
Air circulation (recirculation filter, breather filter)  
The disk enclosure (DE) configures a clean room to keep out particles and other contaminants. The  
DE has a closed-loop air recirculation system. Using the movement of the rotating disks, air is  
continuously cycled through a filter. This filter will trap any particles floating inside the enclosure  
and keep the air inside the DE contaminant free. To prevent negative pressure in the vicinity of the  
spindle when the disks begin rotating, a breather filter is attached. The breather filter also equalizes  
the internal air pressure with the atmospheric pressure due to surrounding temperature changes.  
1-6  
C141-E198  
1.3 System Configuration  
(6)  
Read/write circuit  
The read/write circuit utilizes a read channel mounted with a head IC that supports high-speed  
transmission and an MEEPR4ML (Modified Enhanced Extended Partial Response Class 4 Maximum  
Likelihood) modulation/demodulation circuit in order to prevent errors being triggered by external  
noise and to improve data reliability.  
(7)  
Controller circuit  
The controller circuit uses LSIs to increase the reliability and uses a high speed microprocessing unit  
(MPU) to increase the performance of the SCSI controller.  
1.3  
System Configuration  
For the Fibre Channel, the ANSI standard defines Arbitrated Loop, Fabric, and Point-to-Point  
technologies. The MAS series disk drives support the Arbitrated Loop technology. Figure 1.3 gives  
an example of the FC-AL system configuration.  
Port B  
Port A  
Port B  
Port A  
BC  
BC  
BC  
BC  
Initiator  
(Node-1)  
Drive  
(Node-2)  
Port B  
Port A  
Port B  
Port A  
BC  
BC  
BC  
BC  
Drive  
(Node-4)  
Drive  
(Node-3)  
Figure 1.3 Example of FC-AL system configuration  
Any device connected to the Fibre Channel is called a node. The nodes shown in Figure 1.3  
represent the initiator and individual disk drives. Each node has at least one port called an N_port.  
For FC-AL, each port is called a Node-Loop port (NL_port).  
The MAS series disk drive has two ports, one of which is used for connections to an FC-AL. A  
maximum of 126 NL_ports can be connected to a single port.  
C141-E198  
1-7  
General Description  
(1)  
Loop configuration  
A port embedded with sending and receiving circuits uses differential signals to send and receive data  
on electric signal lines. A pair of signal lines is called a link. Since signals are sent in one direction  
on a link, the links in a system must be connected to form a loop. The FC-AL interface sends and  
receives data via nodes on the loop. Therefore, if a node connected to a loop is powered off or the  
interface signals of a node cannot be sent or received correctly, the loop does not work normally. A  
common solution preventing this problem from occurring is to add a port bypass circuit on the back  
plane of the system. BC in Figure 1.3 indicates the port bypass circuit.  
(2)  
Node addressing  
A specific device number called a SEL ID is assigned to each node on a Fibre Channel loop. The  
combination of signal levels on the back plane is used to define the SEL ID of a disk drive. The  
signal levels are sent on the seven signals (from SEL_0 to SEL_6) from CN1, which serves as an  
SCA interface connector. SEL_6 is the most significant bit (MSB), having a bit weight of the sixth  
power of 2, and SEL_0 is the least significant bit (LSB), having a bit weight of the zeroth power of 2.  
Any number from 0 (X’00) to 125 (X’7D’) can be assigned as the SEL ID of a disk drive.  
1-8  
C141-E198  
CHAPTER 2  
Specifications  
2.1 Hardware Specifications  
This chapter describes specifications of the IDD.  
2.1  
Hardware Specifications  
2.1.1  
Model name and order number  
Each model has a different recording capacities when shipped.  
Table 2.1 lists the model name and order number.  
The data format can be changed by reinitializing with the user's system.  
Table 2.1  
Model names and order numbers  
Capacity  
Number of  
heads  
Model name  
Order number  
Interface type  
Number of disks  
(user area)  
73.49 GB (*)  
36.77 GB (*)  
MAS3735FC CA06244-B400 SCA2, FC-AL  
MAS3367FC CA06244-B200 SCA2, FC-AL  
4
2
8
4
(*) 1GB = 1,000,000,000 bytes  
C141-E198  
2-1  
Specifications  
2.1.2  
Function specifications  
Table 2.2 shows the function specifications of the IDD.  
Table 2.2  
Function specifications  
Specification  
Item  
MAS3735FC  
MAS3367FC  
Formatted capacity/device (*1)  
Number of disks  
73.49 GB (*6)  
36.77 GB (*6)  
4
8
2
4
Number of heads  
Number of cylinders (*2)  
Formatted capacity/track (B)  
Number of rotations min-1 (rpm)  
Average latency time  
Track to Track  
27,094  
27,150  
285,696 to 360,960  
15,000 ± 0.2%  
2.00 msec  
0.3 ms/0.5 ms  
3.3 ms/3.8 ms  
8.0 ms/9.0 ms  
30 s typ. (60 s max.)  
30 s typ.  
Seek time (*3)  
(Read/Write)  
Average  
Full stroke  
Start time  
Stop time  
Start/stop time  
(*4)  
Recording mode  
32/34 MEEPRML  
25.4 mm  
Height:  
Width:  
Depth:  
External  
dimensions  
101.6 mm  
146.0 mm  
Weight (max)  
0.80kg  
Power consumption (*5)  
Interface  
13.0 W  
10.2 W  
Cable length: 30 m max  
93.11 to 118.22 MB/s  
Data  
Disk drive  
FC-AL  
transfer  
rate  
212.5 MB/s max.  
Logical data block length  
512 to 528 byte (Fixed length)  
FC-PLDA (NCITS TR-19),  
Command specification  
FC-PH (ANSI X3.230-1994), FC-PH-2 (ANSI X3.297-1996),  
FC-AL (ANSI X3.272-199X), SCSI-FCP (ANSI X3.269-199X)  
32 MB FIFO ring buffer (*7)  
Data buffer  
Acostic noise (Ready)  
3.6 Bels typ. (4.1 Bels max.)  
(*1)  
The formatted capacity can be changed by changing the logical block length and using spare sector  
space. See Chapter 3 for the further information. The formatted capacity listed in the table is an  
estimate for 512 bytes per sector.  
(*2)  
(*3)  
The number of user cylinders indicates the max., and includes the alternate cylinder. The number of  
user cylinders and alternate cylinders can be specified at format of the IDD.  
The positioning time is as follows:  
2-2  
C141-E198  
2.1 Hardware Specifications  
Seek Difference [2048 Cyl/div]  
(*4)  
(*5)  
The start time is the time from power on or start command to when the IDD is ready, and the stop  
time is the time for disks to completely stop from power off or stop command.  
This value indicates at ready mode.  
(*6) 1GB = 1,000,000,000 bytes  
(*7) 1MB = 1,048,576 bytes  
C141-E198  
2-3  
Specifications  
2.1.3  
Environmental specifications  
Table 2.3 lists environmental and power requirements.  
Table 2.3  
Environmental/power requirements  
Specification  
Item  
MAS3735FC  
MAS3367FC  
Operating  
5 to 55°C  
–10 to 70°C  
–40 to 70°C  
Non-operating  
Temperature  
(*1)  
Transport (within a week)  
DE surface temperature at  
operating  
5 to 60°C  
Gradient  
15°C/h or less  
5 to 95%RH  
5 to 95%RH  
5 to 95%RH  
Operating  
Non operating  
Transport (within a week)  
Relative  
humidity  
Maximum wet bulb  
temperature  
29°C (no condensation)  
Operating (*3)  
Non-operating (*4)  
Transport (packaged)  
Operating  
0.6 mm (5 to 20Hz)/9.8 m/s2 (1G) (20 to 300 Hz) or less  
3.1 mm (5 to 20Hz)/49m/s2 (5G) (20 to 300Hz) or less  
3.1 mm (5 to 20Hz)/49m/s2 (5G) (20 to 300Hz) or less  
637.4m/s2 (65G) (2 ms)  
Vibration (*2)  
Non-operating  
Transport (packaged)  
Operating  
2451.7m/s2 (250G) (2 ms)  
Shock (*2)  
Altitute  
2451.7m/s2 (250G) (2 ms)  
–300 m to 3,000 m  
(above sea  
level)  
Non-operating  
–300 m to 12,000 m  
+12 VDC  
±5%  
Ready  
(Average)  
0.75 A  
0.52 A  
Peak within  
100 µs at  
spin-up  
3.0 A  
Random  
W/R  
(about 80  
IOPS)  
Power  
1.0 A  
0.8 A  
requirements  
Input power  
(*5)  
+5 VDC  
±5%  
Ready  
(Average)  
Random  
W/R  
(about 80  
IOPS)  
1.3 A  
Ripple (*6)  
+5 V/+12 V 250 mVp-p  
2-4  
C141-E198  
2.1 Hardware Specifications  
(*1)  
(*2)  
For detail condition, see Section 4.1.  
Vibration applied to the drive is measured at near the mounting screw hole on the frame as much as  
possible.  
(*3)  
(*4)  
At random seek write/read and default on retry setting with log sweep vibration.  
At power-off state after installation  
Vibration displacement should be less than 2.5 mm.  
(*5)  
(*6)  
Input voltages are specified at the drive connector side, during drive ready state.  
High frequency noise (over 20MHz) is less than 100 mVp-p.  
2.1.4  
Error rate  
Errors detected during initialization and replaced by alternate block assignments are not included in  
the error rate. Data blocks to be accessed should be distributed over the disk medium equally.  
(1)  
Unrecoverable error rate  
Errors which cannot be recovered within 63 retries and ECC correction should not exceed 1 per 1015  
bits.  
Data loss  
For MAS series, Reed Solomon codes are applied for their ECC. The  
sector-data is divided into 4 interleaving sectors, and ECC is  
performed in each sector where the maximum number of errors (up to  
5 byte) can be corrected. [Total maximum byte: 5 byte × 4 ( interleave)  
= 20 byte]  
If the error of read sector keeps allowable error byte number,  
correction is performed. However, if error byte exceeds its allowable  
number, correction may not be performed properly.  
(2)  
Positioning error rate  
Positioning errors which can be recovered by one retry should be 10 or less per 108 seeks.  
2.1.5  
Reliability  
(1)  
Mean Time Between Failures (MTBF)  
MTBF of the IDD during its life time is 1,2000,000 hours (operating: 24 hours/day, 7 days/week  
average DE surface temperature: 50°C or less).  
C141-E198  
2-5  
Specifications  
Note:  
The MTBF is defined as:  
Operating time (hours) at all field sites  
The number of equipment failures from all field sites  
MTBF=  
Failure of the equipment means failure that requires repair, adjustments, or replacement.  
Mishandling by the operator, failures due to bad environmental conditions, power trouble, host  
system trouble, cable failures, or other failures not caused by the equipment are not considered.  
(2)  
(3)  
Mean Time To Repair (MTTR)  
MTTR is the average time taken by a well-trained service mechanic to diagnose and repair a drive  
malfunction. The drive is designed for a MTTR of 30 minutes or less.  
Service life  
The service life under suitable conditions and treatment is as follows.  
The service life is depending on the environment temperature. Therefore, the user must design the  
system cabinet so that the average DE surface temperature is as possible as low.  
DE surface temperature: 40°C or less  
DE surface temperature: 41°C to 45°C  
DE surface temperature: 46°C to 50°C  
DE surface temperature: 51°C to 55°C  
DE surface temperature: 56°C to 60°C  
DE surface temperature: 61°C and more  
5 years  
4.5 years  
4 years  
3.5 years  
3 years  
Strengthen cooling power so that DE surface  
temperature is 60°C or less.  
Even if the IDD is used intermittently, the longest service life is 5 years.  
Note:  
The "average DE surface temperature" means the average temperature at the DE surface  
throughout the year when the IDD is operating.  
2-6  
C141-E198  
2.1 Hardware Specifications  
(4)  
Data security at power failure  
Integrity of the data on the disk is guaranteed against all forms of DC power failure except on blocks  
where a write operation is being performed. The above does not applied to formatting disks or  
assigning alternate blocks.  
C141-E198  
2-7  
This page is intentionally left blank.  
CHAPTER 3  
Data Format  
3.1 Data Space  
3.2 Logical Data Block Addressing  
3.3 Defect Management  
This chapter explains data space definition, logical data block addressing, and defect management on the IDD.  
3.1  
Data Space  
The IDD manages the entire data storage area divided into the following three data spaces.  
User space: Storage area for user data  
Internal test space: Reserved area for diagnostic purposes  
System space: Area for exclusive use of IDD itself  
The user space allows a user access by specifying data. These space can be accessed with the logical  
data block addressing method described in Section 3.2. The internal test space is used by Read/write  
test of self-diagnostics test, but user can’t use direct access. The system space is accessed inside the  
IDD at power-on or during the execution of a specific command, but the user cannot directly access  
the system space.  
3.1.1  
Cylinder configuration  
The IDD allocates cylinders to the user space, Internal test space, and system space. Figure 3.1 is the  
cylinder configuration.  
Spare areas (alternate areas) for defective sectors are provided in the user space. Several sectors in  
the last track of one cell and several cell (alternate cylinders) in the user space are allocated as  
alternate areas according to the user's assignment (MODE SELECT command). See Subsection 3.1.2  
for details.  
C141-E198  
3-1  
Data Format  
Cylinder –99  
to  
Internal test cylinder  
Internal test space  
System space  
~
~
~
~
Cylinder –92  
SA84  
Cylinder –88  
to  
Cylinder –4  
~
~
~
~
SA0  
Zone  
Cell Cylinder  
0
User Space for Cell 0-0  
0
1
Spare Sectors per Cell 0  
27  
28  
29  
User Space for Cell 1-0  
Spare Sectors per Cell 1  
1
User Space  
0
55  
(Primary Cylinder  
0 - (n-1))  
m-27  
User Space for Cell P1-0  
Spare Sectors per Cell P1  
P1  
m
Alternate Cylinder  
(1)  
User Space for Cell xx-1  
1
:
User Space for Cell yy-17  
17  
n
n =27,093 (MAS3735FC)  
27,149 (MAS3367FC)  
Note: Spare sectors on the last track in each cylinder are not necessarily placed at the end of the track  
because of a track skew or a cylinder skew. (Details are explained in Subsection 3.1.3.)  
Figure 3.1 Cylinder configuration  
Apart from the above logical configuration, the IDD intends to increase the storage capacity by  
dividing all cylinders into several zones and changing a recording density of each zone. Tables 3.1 to  
3.3 show the zone layout and the track capacity.  
3-2  
C141-E198  
3.1 Data Space  
Table 3.1  
Zone layout and track capacity  
Cylinder  
Zone  
Byte/track  
Sector/track  
MAS3735FC  
MAS3367FC  
0
1
0 - 1,848  
360,960  
360,960  
360,960  
360,960  
360,960  
360,960  
359,424  
350,208  
340,992  
336,384  
331,776  
322,560  
317,952  
313,344  
304,128  
294,912  
290,304  
285,696  
705  
705  
705  
705  
705  
705  
702  
684  
666  
657  
648  
630  
621  
612  
594  
576  
567  
558  
1,849 - 3,697  
2
3,698 – 5,546  
3
5,547 – 7,395  
4
7,396 – 9,244  
5
9,245 – 11,093  
11,094 – 12,298  
12,299 – 14,315  
14,316 – 16,080  
16,081 – 17,173  
17,174 – 19,330  
19,331 – 20,255  
20,256 – 21,404  
21,405 – 22,469  
22,470 – 24,514  
24,515 – 26,195  
26,196 – 26,840  
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
26,841 – 27,093  
26,841 – 27,149  
Note: When the logical data block length is 512 bytes, the sector/track capacity indicates above amount  
(1)  
User space  
The user space is a storage area for user data. The data format on the user space (the length of data  
block and the number of data blocks) can be specified with the MODE SELECT or MODE SELECT  
EXTENDED command.  
The default value of cylinders in the user space is MAS3735FC = 27,094, MAS3367 FC = 27,150.  
These also equal the maximum cylinders number for each series. The user can also specify the  
number of logical data blocks to be placed in the user space with the MODE SELECT or MODE  
SELECT EXTENDED command. When the number of logical data blocks is specified, as many  
cylinders as required to place the specified data blocks are allocated in the user space.  
C141-E198  
3-3  
Data Format  
A number starting with 0 is assigned to each cylinder required in the user space in ascending order.  
If the number of cylinders do not reach the maximum, the rest of the cylinders will not be used.  
Always one cylinder that is located at the end of each zone in the user space can be established as an  
alternate cylinder. Alternate cylinders will be used for alternate blocks when primary cylinders in the  
user space are used up. See Subsections 3.1.2 and 3.3.2 for details.  
(2)  
(3)  
Internal test space  
The Internal test space is an area for diagnostic purposes only and its data block length is always  
512KByte. The Internal test space consists of 8 cylinders and outer-host cylinder is always assigned.  
The user cannot change the number of cylinders in the Internal test space or their positions.  
System space  
The system space is an area for exclusive use of the IDD itself and the following information are  
recorded.  
Defect list (P list and G list)  
MODE SELECT parameter (saved value)  
Statistical information (log data)  
Controller control information  
The above information is duplicated in several different locations for safety.  
Note:  
The system space is also called SA space.  
3.1.2  
Alternate spare area  
The alternate spare area consists of the last track of each cell in the user space and an alternate  
cylinder allocated to the last cylinder of each zone.  
The spare area in each cell is placed at the end of the last track as shown in Figure 3.2. These spare  
sectors are located in the end of the track logically, not necessarily located at the end physically  
because of track skew or cylinder skew. (Details are explained on Subsection 3.1.3.)  
Size can be specified by the MODE SELECT command.  
The number of spare sectors per cell can be specified from 0 to 168. The default for the spare sectors  
number is 168.  
3-4  
C141-E198  
3.1 Data Space  
Cell  
Note: This drive manages alternate spare areas for each cell, which is a set of cylinders. One cell  
consists of 28 cylinders.  
Figure 3.2 Spare area in cell  
An alternate cylinder is used when spare sectors in a cell are used up or 0 is specified as the number  
of spare sectors in a cell. 1 cylinder at the end of each zone of the user space is allocated as alternate  
cylinders as shown in Figure 3.3.  
The user space and the CE space share the alternate cylinders.  
Zone  
Figure 3.3 Alternate cylinder  
Note:  
The number of alternate cylinders can not be changed.  
3.1.3  
(1)  
Track format  
Physical sector allocation  
Figure 3.4 shows the allocation of the physical sectors in a track. The length in bytes of each  
physical sector and the number of sectors per track vary depending on the logical data block length.  
The unused area (G4) exists at the end of the track in formats with most logical data block lengths.  
The interval of the sector pulse (length of the physical sector) is decided by multiple of 40MHz free  
running frequency. This clock is not equal to the interval of the byte clock for each zone. Therefore,  
the physical sector length cannot be described with a byte length.  
C141-E198  
3-5  
Data Format  
4.0 msec  
Servo frame  
n = 211 (zone 0) ~ 266 (zone 17)  
Figure 3.4 Track format  
(2)  
Track skew and head skew  
To avoid waiting for one turn involved in head and cylinder switching, the first logical data block in  
each track is shifted by the number of sectors (track skew and head skew) corresponding to the  
switching time. Figure 3.5 shows how the data block is allocated in each track.  
At the head switching location in a cylinder, the first logical data block in track t + 1 is allocated at  
the sector position which locates the track skew behind the sector position of the last logical data  
block sector in track t.  
At the cylinder switching location, like the head switching location, the first logical data block in a  
cylinder is allocated at the sector position which locates the head skew behind the last logical sector  
position in the preceding cylinder. The last logical sector in the cylinder is allocated when  
formatting, and is an unused spare sector.  
3-6  
C141-E198  
3.1 Data Space  
Cylinder skew  
Head  
P
Cylinder skew  
Track skew  
Head  
P+1  
Leading logical  
sector in head p+1  
Figure 3.5 Track skew/head skew  
The number of physical sectors (track skew factor and head skew factor) corresponding to the skew  
time varies depending on the logical data block length because the track skew and the head skew are  
managed for individual sectors. The IDD automatically determines appropriate values for the track  
skew factor and the head skew factor according to the specified logical data block length. The value  
can be read out by the MODE SENSE or MODE SENSE EXTENDED command after the track has  
been formatted.  
3.1.4  
Sector format  
Each sector on the track consists of an ID field, a data field, and a gap field which separates them.  
Figure 3.6 gives sector format examples.  
SCT  
SCT  
PLO  
SM1 DATA1 SM2 DATA2 BCRC ECC  
PAD  
G1 Sync  
G2  
Servo  
SCT  
G3  
SCT  
G1 Sync  
PLO  
PLO  
G1 Sync  
SM1 DATA1 SM2 DATA4 BCRC ECC  
SM1 DATA1 SM2 DATA3  
PAD  
PAD  
G2  
Figure 3.6 Sector format  
C141-E198  
3-7  
Data Format  
Each sector on the track consists of the following fields:  
(1)  
(2)  
Gaps (G1, G2, G3)  
No pattern is written on the gap field.  
PLO Sync  
In this field, pattern X'00' is written.  
(3)  
(4)  
Sync Mark (SM1, SM2)  
In this field, special pattern is written. This special pattern indicates the beginning of the data field.  
Data field (DATA1-DATA4)  
User data is stored in the data field of the sector. The length of the data field is equal to that of the  
logical data block which is specified with a parameter in the MODE SELECT command. Any  
multiple of 4 between 512 and 528 bytes can be specified as the length.  
(5)  
(6)  
(7)  
BCRC  
It is a 4-byte error detection code. Errors in the ID field. Single burst errors with lengths of up to 32  
bits for each logical block can be detected.  
ECC  
This is the 40-byte code that allows detection and correction of errors in the data field, which is  
capable of correcting the single burst error up to 160 bits max. on the fly.  
PAD  
A specified length of x‘00’ pattern is written in this field. This field includes the variation by rotation  
and circuit delay till reading/writing.  
3-8  
C141-E198  
3.2 Logical Data Block Addressing  
3.1.5  
Format capacity  
The size of the usable area for storing user data on the IDD (format capacity) varies according to the  
logical data block or the size of the spare sector area. Table 3.2 lists examples of the format capacity  
when the typical logical data block length and the default spare area are used. The following is the  
general formula to calculate the format capacity.  
[Number of sectors of each zone] = [number of sectors per track × number of tracks per cell –  
number of alternate spare sectors per cell] × [number of cells in the zone]  
[Formatted capacity] = [total of sectors of all zones] ÷ [number of physical sectors in logical block] ×  
[logical data block length]  
The following formula must be used when the number of logical data blocks are specified with the  
parameter in the MODE SELECT or MODE SELECT EXTENDED command.  
[Format capacity] = [logical data block length] × [number of logical data blocks]  
The logical data block length, the maximum logical block address, and the number of the logical data  
blocks can be read out by a READ CAPACITY, MODE SENSE, or MODE SENSE EXTENDED  
command after initializing the disk medium.  
Table 3.2  
Format capacity  
Model  
Data heads Data block length  
User blocks Format capacity (GB)  
MAS3735FC  
MAS3367FC  
8
143,552,136  
71,819,496  
73.49 (*)  
36.77 (*)  
512  
4
(*) 1GB = 1,000,000,000 bytes  
Note:  
Total number of spare sectors is calculated by adding the number of spare sectors in each primary  
cylinder and the number of sectors in the alternate cylinders.  
3.2  
Logical Data Block Addressing  
Independently of the physical structure of the disk drive, the IDD adopts the logical data block  
addressing as a data access method on the disk medium. The IDD relates a logical data block address  
to each physical sector at formatting. Data on the disk medium is accessed in logical data block  
units. The INIT specifies the data to be accessed using the logical data block address of that data.  
The logical data block addressing is a function whereby individual data blocks are given addresses of  
serial binaries in each drive.  
C141-E198  
3-9  
Data Format  
(1)  
Block address of user space  
The logical data block address number is consecutively assigned to all of the data blocks in the user  
space starting with 0 to the first data block.  
The IDD treats sector 0, track 0, cylinder 0 as the first logical data block. The data block is allocated  
in ascending order of addresses in the following sequence (refer to Figure 3.5):  
1) Logical data blocks are assigned in ascending order of sector number in the same track.  
2) Subsequent logical data blocks are assigned to sectors in every track except the last track in  
ascending order of track number in the same track (head). Within the same track, logical data  
blocks are assigned in the same way as step 1).  
3) Subsequent logical data blocks are assigned to sectors in every track except the last track in  
ascending order of track number in the same cell. Within the same track, logical data blocks are  
assigned in the same way as step 1).  
4) For the last track in the same cell, subsequent logical data blocks are assigned to sectors other  
than spare sectors in ascending order of sector number.  
5) After blocks have been assigned in the same cell according to steps 1) to 4), subsequent logical  
data blocks are assigned in ascending order of cell number in the same way as in steps 1) to 4).  
Logical data blocks are assigned starting from track 0 in the next cell until the last cylinder  
(immediately preceding the alternate cylinder n-1 shown in Figure 3.1) of the zone except  
alternate cylinders in cells in the user space.  
When the logical data block is allocated, some sectors (track skew and head skew) shown in Figure  
3.5 are provided to avoid waiting for one turn involving head and cylinder switching at the location  
where the track or the head is physically switched.  
See Subsection 3.3.2 for defective/alternate block treatment and the logical data block allocation  
method in case of defective sectors exist on the disk.  
(2)  
Alternate area  
Alternate areas in the user space (spare sectors in the cell and alternate cylinders) are not included in  
the above logical data block addresses. Access to sectors which are allocated as an alternate block in  
the alternate area is made automatically by means of IDD sector slip treatment or alternate block  
treatment (explained in Subsection 3.3.2), so the user does not have to worry about accessing the  
alternate area. The user cannot access with specifying the data block on the alternate area explicitly.  
3-10  
C141-E198  
3.3 Defect Management  
3.3  
Defect Management  
Defect list  
3.3.1  
Information of the defect location on the disk is managed by the defect list. The following are defect  
lists which the IDD manages.  
P list (Primary defect list): This list consists of defect location information available at the disk  
drive shipment and is recorded in a system space. The defects in this list are permanent, so the  
INIT must execute the alternate block allocation using this list when initializing the disk.  
D list (Data defect list): This list consists of defect location information specified in a FORMAT  
UNIT command by the INIT at the initialization of the disk. This information is recorded in the  
system space of the disk drive as the G list. To execute the alternate block allocation, the  
FORMAT UNIT command must be specified.  
G list (Growth defect list): This list consists of defective logical data block location information  
specified in a REASSIGN BLOCKS command by the INIT, information on defective logical data  
blocks assigned alternate blocks by means of IDD automatic alternate block allocation,  
information specified as the D list, and information generated as the C list. They are recorded in  
the system space on the disk drive.  
The INIT can read out the contents of the P and G lists by the READ DEFECT DATA command.  
3.3.2  
Alternate block allocation  
The alternate data block is allocated to a defective data block (= sectors) in defective sector units by  
means of the defect management method inside the IDD.  
The INIT can access all logical data blocks in the user space, as long as there is no error.  
Spare sectors to which alternate blocks are allocated can be provided in either "spare sectors in a  
cell" or "alternate cylinders". See Subsection 3.1.2 for details.  
The INIT can specify the size and area for spare sectors by the MODE SELECT command at the  
time of the initialization of the disk.  
Both of the following are applicable to the alternate block allocation.  
Sector slip treatment: Defective sectors are skipped and the logical data block corresponding to  
those sectors is allocated to the next physical sectors. This treatment is made on the same cell as  
the defective sector's and is effective until all spare sectors in that cell are used up.  
Alternate sector treatment: The logical data block corresponding to defective sectors is allocated  
to unused spare sectors in the same cell or unused spare sectors in the alternate cylinder.  
The alternate block allocation is executed by the FORMAT UNIT command, the REASSIGN  
BLOCKS command, or the automatic alternate block allocation. Refer to OEM Manual–Fibre  
Channel Specifications–for details of specifications on these commands. The logical data block is  
allocated to the next physically continued sectors after the above sector slip treatment is made. On  
the other hand, the logical data block is allocated to spare sectors which are not physically  
consecutive to the adjacent logical data blocks. If a command which processes several logical data  
blocks is specified, the IDD processes those blocks in ascending order of logical data block.  
C141-E198  
3-11  
Data Format  
(1)  
Alternate block allocation during FORMAT UNIT command execution  
When the FORMAT UNIT command is specified, the allocation of the alternate block to those  
defective sectors included in the specified lists (P, G, or D) is continued until all spare sectors in the  
same cell are used up. When they are used up, unused spare sectors in the alternate cylinder are  
allocated to the subsequent sectors in the cylinder by means of alternate sector treatment. Figure 3.7  
is examples of the alternate block allocation during the FORMAT UNIT command execution.  
: n represents a logical data block number  
: Defective sector  
: Unused spare sector  
Figure 3.7 Alternate block allocation by FORMAT UNIT command  
During FORMAT UNIT command, alternate block allocation is conducted in following cases:  
1) Unrecovered write offtrack condition during a media write  
2) Uncorrectable Data Error during a media read (certification) *1  
If above errors are detected during FORMAT UNIT command, the IDD allocates the alternate  
block(s) to the defective data blocks. Reassign procedure itself is the same as one in REASSIGN  
BLOCKS command.  
3-12  
C141-E198  
3.3 Defect Management  
*1 Certification is permitted when DCRT flag is cleared (DCRT flag=0) in FORMAT UNIT  
command.  
The IDD checks all initialized logical data blocks by reading them out after the above alternate  
block allocation is made to initialize (format) the disk.  
(2)  
Alternate block allocation by REASSIGN BLOCKS command  
When the REASSIGN BLOCKS command is specified, the alternate block is allocated to the  
defective logical data block specified by the initiator by means of alternate sector treatment. If there  
are unused spare sectors in the same cell as the specified defective logical data block, the alternate  
block is allocated to these unused spare sectors. However, the alternate block is allocated to unused  
spare sectors in the alternate cylinder when all spare sectors in the cell are used up.  
Figure 3.8 is examples of the alternate block allocation by the REASSIGN BLOCKS command.  
Alternate sectors  
The same cell  
: n represents a logical data block number  
: Defective sector  
: Unused spare sector  
Figure 3.8 Alternate block allocation by REASSIGN BLOCKS command  
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3-13  
Data Format  
(3)  
Automatic alternate block allocation  
Automatic alternate block allocation at read operation  
If the ARRE flag in the MODE SELECT parameter permits the automatic alternate block allocation,  
the IDD automatically executes the alternate block allocation and data duplication on the defective  
data block detected during the READ or READ EXTENDED command. This allocation method is  
the same as with the REASSIGN BLOCKS command (alternate sector treatment).  
Automatic alternate block allocation at write operation  
If AWRE flag in the MODE SELECT parameter permits the automatic alternate block allocation, the  
IDD executes two kinds of automatic alternate processing during WRITE command processing as  
described below:  
Type 1 (Reassignment of Uncorrectable Read Error)  
1) Commands to be applied  
-
-
-
WRITE  
WRITE EXTEND  
WRITE at executing WRITE AND VERIFY  
2) Application requirements  
When any of the above commands is issued to LBA registered in the uncorrectable error log of  
the READ command (LBA log of uncorrectable error while the READ command is executed),  
the AWRE processing is applied.  
3) AWRE processing  
The following processings are performed when the LBA matches the one in the uncorrectable  
error log:  
a) Primary media check  
-
Creates an uncorrectable error pattern (invalid LBA pattern) in the position of the error  
LBA, repeats the primary media check up to three times. If the error still occurs after the  
check repeated three times, it is judged to be defective. Then, it performs the alternate  
processing.  
b) Alternate processing  
-
Alternate media check  
Writes the data that causes an unrecoverable error into the alternate block, and performs  
the media check.  
(If the alternate block is a defective sector, the block is registered to the G list, another  
alternate block is allocated.)  
c) SA and defect map update processing (on alternate side)  
When an error occurs in the alternate processing, this WRITE command terminates with error.  
When the alternate processing normally terminates, the WRITE command is executed.  
Depending on the alternate processing result, one of the following sense codes is returned:  
Alternate processing is succeeded: 01-OC-01  
Fatal error (SA write retry out):  
03-OC-02  
3-14  
C141-E198  
3.3 Defect Management  
Type 2 (Reassignment of write fail sector)  
1) Commands to be applied  
-
-
WRITE command  
WRITE EXTENDED command  
2) Application requirements / processing  
When WRITE/WRITE EXTENDED command detects any Servo error (e.g. Write offtrack error)  
and cannot be recovered within pre-determined retry number (specified in Mode Parameter). For  
the sectors around defective Servo, alternate blocks are allocated and the data of this WRITE  
commands are re-written.  
Sectors to be made AWRE shall be following:  
-
-
-
-
the sector where the error occurs and the latter sectors and,  
the sectors whose data are logically continual and stored in Cache,  
the sectors which will be processed in this Write command and,  
the sectors which locate between erroneous Servo -1 and +1 (including Split sector)  
This function is also applied for the sector that has already been re-assigned.  
Remark:  
When a write protection is prohibited through the setting terminal, the auto alternate block  
allocation processing specification is disabled.  
Automatic alternate block allocation is made only once during the  
execution of one command. If second defective block is detected, the  
alternate block assignment processing for the first defective block is  
executed but the alternate block assignment processing for the second  
one is not executed and the command being executed terminates.  
However, the initiator can recover the twice error by issuing the same  
command again.  
When an error is detected in a data block in the data area, recovery  
data is rewritten and verified in automatic alternate block allocation  
during the execution of the READ or READ EXTENDED command.  
Alternate block allocation will not be made for the data block if  
recovery is successful.  
Example: Even if the data error which is recoverable by the WRITE  
LONG command is simulated, automatic alternate block  
allocation will not be made for the data block.  
C141-E198  
3-15  
This page is intentionally left blank.  
CHAPTER 4  
Installation Requirements  
4.1 Mounting Requirements  
4.2 Power Supply Requirements  
4.3 Connection Requirements  
This chapter describes the environmental, mounting, power supply, and connection requirements.  
4.1  
Mounting Requirements  
External dimensions  
4.1.1  
Figures 4.1 show the external dimensions of the IDD and the location of the holes for the IDD  
mounting screws.  
Note:  
Dimensions are in mm.  
Mounting screw: #6-32UNC  
C141-E198  
4-1  
Installation Requirements  
The value marked with (*) indicates the dimension between mounting holes on the bottom face.  
Figure 4.1 External dimensions  
4-2  
C141-E198  
4.1 Mounting Requirements  
4.1.2  
Mounting  
The permissible orientations of the IDD are shown in Figure 4.2, and the tolerance of the angle is ±5°  
from the horizontal plane.  
(a) Horizontal –1  
(b) Horizontal –2  
(c) Vertical –1  
(d) Vertical –2  
(e) Upright mounting –1  
Direction of gravity  
(f) Upright mounting –2  
Figure 4.2 IDD orientations  
4.1.3  
Notes on mounting  
(1)  
Mounting frame structure  
Special attention must be given to mount the IDD disk enclosure (DE) as follows.  
a) Use the frame with an embossed structure, or the like. Mount the IDD with making a gap of  
2.5 mm or more between the IDD and the frame of the system.  
b) As shown in Figure 4.3, the inward projection of the screw from the IDD frame wall at the  
corner must be 5.0 mm or less.  
C141-E198  
4-3  
Installation Requirements  
c) Tightening torque of screw must be secured with 0.59N· m (6kgf· cm) ±12%.  
d) Impact caused by the electric driver must be within the device specifications.  
e) Must be handled on an anti-static mat.  
5.0 or less  
5.0 or less  
Figure 4.3 Mounting frame structure  
(2)  
Limitation of side-mounting  
Mount the IDD using the 4 screw holes at the both ends on the both sides as shown in Figure 4.4. Do  
not use the center hole by itself.  
In case of using the center hole, it must be used in combination with 2 holes on both ends.  
(Total 6 screws for 6 holes enclosed)  
4
Holes for  
mounting screw.  
3
2
Do not use center holes.  
1
Holes for mounting screw  
Use four holes (No.1-4) to mount.  
Figure 4.4 Limitation of side-mounting  
4-4  
C141-E198  
4.1 Mounting Requirements  
(3)  
(4)  
Limitation of bottom-mounting  
Use all 4 mounting holes on the bottom face.  
Environmental temperature  
Temperature condition at installed in a cabinet is indicated with ambient temperature measured 3 cm  
from the disk drive. At designing the system cabinet, consider following points.  
Make a suitable air flow so that the DE surface temperature does not exceed 60°C.  
Cool the PCA side especially with air circulation inside the cabinet. Confirm the cooling effect  
by measuring temperature of specific ICs and the DE. These measurement results should be  
within a criteria listed in Table 4.1.  
Keeping the DE surface temperature at 50°C or below at ambient temperature 25°C, which is a  
condition for assuring an MTBF of 1,200,000 hours, requires an air flow of 0.7 m/s.  
Table 4.1  
Surface temperature check point  
No.  
1
Measurement point  
Criteria  
60°C  
88°C  
92°C  
90°C  
91°C  
Center of DE cover  
Read channel LSI  
VCM/SPM Driver  
HDC  
2
3
4
5
MPU  
3
5
1
4
2
Figure 4.5 Surface temperature measurement points  
C141-E198  
4-5  
Installation Requirements  
(5)  
Service clearance area  
The service clearance area, or the sides which must allow access to the IDD for installation or  
maintenance, is shown in Figure 4.6.  
[Surface R]  
- Hole for mounting screw  
[Surface P]  
- Cable connection  
[Surface Q]  
- Hole for mounting screw  
Figure 4.6 Service clearance area  
(6)  
(7)  
External magnetic field  
The drive should not be installed near the ferromagnetic body like a speaker to avoid the influence of  
the external magnetic field.  
Leak magnetic flux  
The IDD uses a high performance magnet to achieve a high speed seek. Therefore, a leak magnetic  
flux at surface of the IDD is large. Mount the IDD so that the leak magnetic flux does not affect to  
near equipment.  
(8)  
Others  
Seals on the DE prevent the DE inside from the dust. Do not damage or peel off labels.  
4-6  
C141-E198  
4.2 Power Supply Requirements  
4.2  
Power Supply Requirements  
(1)  
Allowable input voltage and current  
The power supply input voltage measured at the power supply connector pin of the IDD (receiving  
end) must satisfy the requirement given in Subsection 2.1.3. (For other requirements, see Items (4)  
below.)  
(2)  
Current waveform (reference)  
Figure 4.7 shows the waveform of +12 VDC.  
MAS3735FC  
MAS3367FC  
Time (2 sec/div)  
Time (2 sec/div)  
Figure 4.7 Current waveform (+12 VDC)  
(3)  
(4)  
Power on/off sequence  
The order of the power on/off sequence of +5 VDC and +12 VDC, supplied to the IDD, does not  
matter.  
Sequential starting of spindle motors  
After power is turned on to the IDD, a large amount of current flows in the +12 VDC line when the  
spindle motor rotation starts. Therefore, if more than one IDD is used, the spindle motors should be  
started sequentially using one of the following procedures to prevent overload of the power supply  
unit.  
a) Issue START/STOP commands at more than 12-second intervals to start the spindle motors. For  
details of this command specification, refer to Fibre Channel Interface Specifications.  
b) Turn on the +12 VDC power in the power supply unit at more than 12-second intervals to start  
the spindle motors sequentially.  
C141-E198  
4-7  
Installation Requirements  
(5)  
Noise filter  
To eliminate AC line noise, a noise filter should be installed at the AC input terminal on the IDD  
power supply unit. The specification of this noise filter is as follows:  
Attenuation: 40 dB or more at 10 MHz  
Circuit construction: T-configuration as shown in Figure 4.8 is recommended.  
Figure 4.8 AC noise filter (recommended)  
4-8  
C141-E198  
4.3 Connection Requirements  
4.3  
Connection Requirements  
4.3.1  
Connector  
Figure 4.9 shows the locations of interface connector.  
Interface connector (CN1)  
(including power supply connector)  
Figure 4.9 Connector location  
4.3.2  
Interface connector  
The connector for the Fibre Channel Loop is an unshielded SCA-2 connector which has two 20-  
pin rows spaced 1.27 mm (0.05 inch) apart. Figure 4.10 shows the connector. See Appendix A  
for signal assignments on the connector.  
For details on the physical/electrical requirements of the interface signals, refer to Chapter 1 in  
Fibre Channel Interface Specifications.  
C141-E198  
4-9  
Installation Requirements  
Figure 4.10 SCA2 type connector  
4-10  
C141-E198  
CHAPTER 5  
Installation  
5.1 Notes on Handling Drives  
5.2 Setting  
5.3 Mounting Drives  
5.4 Dismounting Drives  
5.5 Checking Operation after Installation and Preparing  
the IDD for Use  
5.6 Spare Disk Drive  
This chapter describes the notes on handling drives, setting, mounting drives, confirming drive operations  
after installation and preparation for use, and dismounting drives.  
5.1  
Notes on Handling Drives  
The items listed in the specifications in Table 2.1 must be strictly observed.  
(1)  
General notes  
a) Do not give the drive shocks or vibrations exceeding the value defined in the standard because it  
may cause critical damage to the drive. Especially be careful when unpacking.  
b) Do not leave the drive in a dirty or contaminated environment.  
c) Since static discharge may destroy the CMOS semiconductors in the drive, note the following  
after unpacking:  
Use an antistatic mat and body grounding when handling the drive.  
Hold the DE when handling the drive. Do not touch PCAs except for setting.  
Hot temperature  
To prevent injury, do not handle the drive until after the device has  
cooled sufficiently after turning off the power. The DE and LSI become  
hot during operation and remain hot immediately after turning off the  
power.  
C141-E198  
5-1  
Installation  
(2)  
Unpackaging  
a) Use a flat work area. Check that the "This Side Up" sign side is up. Handle the package on soft  
material such as a rubber mat, not on hard material such as a desk.  
b) Be careful not to give excess pressure to the internal unit when removing cushions.  
c) Be careful not to give excess pressure to the PCAs and interface connector when removing the  
drive from the antistatic bag.  
d) Do not remove the sealing label or cover of the DE and screws.  
(3)  
Installation/removal/replacement  
a) Do not attempt to connect or disconnect connections when power is on.  
b) Do not move the drive when power is turned on or until the drive completely stops (for 30  
seconds) after power is turned off.  
c) Place and keep removed screws and other parts where they will not get lost or damaged.  
d) Keep a record of all maintenance work for replacing.  
(4)  
Packaging  
a) Store the drive in an antistatic vinyl pack.  
b) It is recommended to use the same cushions and packages as those at delivery. If those at  
delivery cannot be used, use a package with shock absorption so that the drive is free from direct  
shocks. In this case, fully protect the PCAs and interface connector so that they are not damaged.  
c) Indicate "This Side Up" and "Handle With Care" on the outside of the package so that it is not  
turned over.  
(5)  
Delivery  
a) When delivering the drive, provide packaging and do not turn it over.  
b) Minimize the delivery distance after unpacking and avoid shocks and vibrations with cushions.  
For the carrying direction at delivery, use one of the mount allowable directions in Subsection  
4.1.2 (vertical direction is recommended).  
(6)  
Storage  
a) Provide vaporproof packaging for storage.  
b) The storage environment must satisfy the requirements specified in Subsection 2.1.3 when the  
drive is not operating.  
c) To prevent condensation, avoid sudden changes in temperature.  
5-2  
C141-E198  
5.2 Setting  
5.2  
Setting  
5.2.1  
Loop ID setting  
When setting the fibre channel loop ID, use SEL0 to SEL6 of interface connector CN1. IN bit  
weighting, SEL6 corresponds to the MSB, SEL0 to the LSB, and 126 types of X'00' to X'7D' can be  
specified as loop IDs.  
5.2.2  
Mode settings  
(1)  
Motor start mode  
The method for start control of the IDD spindle motor can be set in accordance with Table 5.1.  
Table 5.1  
Motor start mode  
Setting  
Signal name  
Start_2/Mated  
Start_1/Mated  
Start mode  
Connector pin  
CN1-10  
Open  
CN1-09  
Open  
The drive is not connected to the system. The drive does not start the  
spindle motor.  
Open  
GND  
GND  
GND  
Open  
GND  
The drive is connected to the system. After recognizing the  
connection, the drive starts the spindle motor upon receipt of a  
START/STOP UNIT command.  
The drive is connected to the system. After recognizing the  
connection, the drive starts the spindle motor after a prescribed delay  
time has elapsed.  
The drive is connected to the system. The driver starts the spindle  
motor immediately after recognizing the connection.  
Set the loop ID so that there are no duplicates between devices on the  
same loop.  
C141-E198  
5-3  
Installation  
5.3  
Mounting Drives  
5.3.1  
Mounting procedures  
Since mounting the drive depends on the system cabinet structure, determine the work procedures  
considering the requirements specific to each system. The general mounting method and items to be  
checked are shown below.  
See Subsection 4.1 for the details of requirements for installing the IDD.  
1) With a system to which an external operator panel is mounted, if it is difficult to access the  
connector after the drive is mounted on the system cabinet, connect the external operator panel  
cable before mounting the drive.  
2) Fix the drive in the system cabinet with four mounting screws as follows:  
The drive has 10 mounting holes (both sides: 3 × 2, bottom: 4). Fix the drive by using four  
mounting holes of both sides or the bottom. (See Figure 4.6)  
Use mounting screws whose lengths inside the drive mounting frame are 5.0 mm or less  
when the screws are tightened (see Figure 4.3).  
When mounting the drive, be careful not to damage parts on the PCAs.  
3) Check to ensure that the DE is not touching the frame on the system side after tightening the  
screws. At least 2.5mm of clearance is required between the DE and the frame. (Indicated in  
Figure 4.3)  
4) When an electric driver is in use, less than device specifications must be used.  
5-4  
C141-E198  
5.4 Dismounting Drives  
5.4  
Dismounting Drives  
Since the method and procedure for dismounting the disk drive for replacement of the drive, etc.  
depends on the locker structure of the system, etc., the work procedure must be determined in  
consideration of the requirements specific to the system. This section describes the general  
procedure and notes on dismounting the drive.  
Damage  
1. When dismounting the drive which is mounted on the system while power is  
supplied to it.  
The drive to be dismounted must be separated from the loop.  
Dismounting the drive which is not separated from the loop may cause  
an unexpected error.  
If the drive is not separated from the loop, issue an LPB to the drive  
from the initiator in a primitive sequence of the order set.  
It is recommended to stop the spindle motor prior to this loop  
separation operation. The spindle motor can be stopped by a  
START/STOP command. It takes about 30 seconds for the spindle  
motor to stop completely.  
Then, dismount the drive using the drive mounting/dismounting  
mechanism, etc. of the system. If the drive is dismounted while the  
spindle motor is running, special care is required to avoid excessive  
vibration or shock to the drive. It is recommended to stop the operation  
once the SCA connector breaks off contact and wait until the spindle  
motor stops (about 30 seconds) before dismount the drive.  
When storing or transporting the drive, put it in an antistatic bag.  
(Shown in Section 5.1).  
2. When dismounting the drive which is mounted on the system while power is  
not supplied to it.  
Do not move the drive until the drive stops completely (about 30  
seconds if the spindle motor was stopped by a START/STOP UNIT  
command, and about 30 seconds after powering-off when the power  
was simply turned off).  
Then, dismount the drive using the drive mounting/dismounting  
mechanism, etc. of the system.  
When storing or transporting the drive, put it in an antistatic bag.  
(Shown in Section 5.1).  
C141-E198  
5-5  
Installation  
5.5  
Checking Operation after Installation and Preparing the IDD for Use  
5.5.1  
Checking initial operation  
This section explains how to check operation after power is turned on. Since the initial operation of  
an IDD differs depending on the settings of the motor start mode, check the following initial  
operations according to the motor start mode set during installation.  
(1)  
Initial operation if the settings have been specified so that turning power on automatically starts  
rotating the motor  
a) When power is turned on, the Active LED blinks and the IDD starts the initial self-diagnosis.  
b) If the initial self-diagnosis detects a problem, the IDD sends the Fault LED Out signal to the  
interface connector, as specified by SFF8045.  
Remark: The spindle motor may or may not start rotating in this stage.  
c) If the IDD is in idle mode, the Active LED remains lit. (When the initiator accesses the IDD, the  
LED goes off and then goes on again at the end of the processing requested by the initiator.)  
(2)  
Initial operation if the settings have been specified so that the START/STOP UNIT command is used  
to start rotating the motor  
a) When power is turned on, the Active LED goes on momentarily and the IDD starts the initial  
self-diagnosis.  
b) If the initial self-diagnosis detects a problem, the IDD sends the Fault LED Out signal to the  
interface connector, as specified by SFF8045.  
c) The spindle motor does not rotate until the START/STOP UNIT command is received. The  
initiator is required to use the procedure described in Section 5.5.2 to send the START/STOP  
UNIT command.  
d) About 60 seconds after the START/STOP UNIT command is received, the disk drive enters the  
READY state. The IDD then starts reading system information from the system space on disks.  
e) The Active LED goes off while the command is being executed.  
Take the following actions if a problem occurs:  
(3)  
a) Check if all cables are correctly connected.  
b) Check if the power supply voltage is correct. (Measure the voltage at the power connector on the  
IDD.)  
5-6  
C141-E198  
5.5 Checking Operation after Installation and Preparing the IDD for Use  
c) Continuous sending of the Fault LED Out signal to the interface connector indicates the initial  
self-diagnosis has detected a problem. In this event and if the situation allows, sense data should  
be obtained by issuing the REQEUST SENSE command from the initiator (host system). Sense  
data is information required for troubleshooting.  
The Active LED goes off while the IDD command is being executed.  
For some commands, however, since the Active LED goes off for only a  
fraction of a second, the Active LED looks like it flashes or remains lit.  
5.5.2  
Checking connection  
When the initial operation is checked normally after power is turned on, check that the IDD is  
connected to the loop from the host system. Although checking the connection depends on the  
structure of the host system, this section describes the general procedures.  
(1)  
Checking procedure  
Issuing the commands and determining the end status depends on the start mode of the spindle motor  
and UNIT ATTENTION report mode (specified with setting terminal). Figure 5.1 shows the  
recommended checking procedure for the mode that the motor starts when power is turned on.  
Figure 5.2 shows for the mode that the motor starts by the START/STOP command. In these  
recommended checking procedures, following items are checked.  
Note:  
Following steps a) to e) correspond to a) to e) in Figures 5.1 and 5.2.  
a) Issue the TEST UNIT READY command and check that the IDD is connected correctly to  
the loop and the initial operation after power is turned on ended normally. The command  
issue period of the TEST UNIT READY command shall be more than 20 ms.  
b) To control starting of the spindle motor from the host system, issue the START/STOP  
UNIT command to start the spindle motor.  
c) Check the loop operations with the WRITE BUFFER and READ BUFFER commands.  
d) Start the IDD self-diagnostic test with the SEND DIAGNOSTIC command and check the  
basic operations of the controller and disk drive.  
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Motor starts when power is turned on  
(60  
Figure 5.1 Checking the IDD connection (A)  
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5.5 Checking Operation after Installation and Preparing the IDD for Use  
Motor starts by START/STOP command  
* Executing time: about 60 seconds  
1
Figure 5.2 Checking the IDD connection (B)  
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Installation  
(2)  
Checking at abnormal end  
a) When sense data can be obtained with the REQUEST SENSE command, analyze the sense data  
and retry recovery for a recoverable error. Refer to Chapter 5 of Fibre Channel Interface  
Specifications for further details.  
b) Check the setting of the terminals. Note that the checking procedure of loop connection differs  
depending on the setting of the motor start mode and UNIT ATTENTION report mode.  
5.5.3  
Formatting  
Since the disk drive is formatted with a specific (default) data format for each model (part number)  
when shipped from the factory, the disk need not be formatted (initialized) when it is installed in the  
system.  
However, when the system needs data attributes different from the default format, all sides of the disk  
must be formatted (initialized) according to the procedures below.  
The user can change the following data attributes at initialization:  
Logical data block length  
Number of logical data blocks or number of cylinders in the user space  
Alternate spare area size  
This section outlines the formatting at installation. Refer to Chapters 3 and 6 of Fibre Channel  
Interface Specifications for further details.  
(1)  
MODE SELECT/MODE SELECT EXTENDED command  
Specify the format attributes on the disk with the MODE SELECT or MODE SELECT EXTENDED  
command. The parameters are as follows.  
a. Block descriptor  
Specify the size (byte length) of the logical data block in the "data block length" field. To  
explicitly specify the number of logical data blocks, specify the number in the "number of data  
blocks" field. Otherwise, specify 0 in "number of data blocks" field. In this case, the number of  
logical data blocks after initialization is determined by the value specified in the format  
parameter (page code = 3) and drive parameter (page code = 4).  
b. Format parameter (page code = 3)  
Specify the number of spare sectors for each cell in the "alternate sectors/zone" field and specify  
the number of tracks for alternate cylinders (= number of alternate cylinders × number of disk  
drive heads) in the "alternate tracks/zone" field. It is recommended not to specify values smaller  
than the IDD default value in this field.  
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5.5 Checking Operation after Installation and Preparing the IDD for Use  
(2)  
FORMAT UNIT command  
Initialize all sides of the disk with the FORMAT UNIT command. The FORMAT UNIT command  
initializes all sides of the disk using the P lists, verifies data blocks after initialization, and allocates  
an alternate block for a defect block detected with verification. With initialization, the value "00" is  
written into all bytes of all logical data blocks. Only the position information of defect blocks  
detected with verification is registered in the G list. The specifications are as follows:  
a. Specifying CDB  
Specify 0 for the "FmtData" bit and the "CmpLst" bit on CDB, 000 for the "Defect List Format"  
field, and data pattern written into the data block at initialization for the "initializing data pattern"  
field.  
b. Format parameter  
When the values in step a. are specified with CDB, the format parameter is not needed.  
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Installation  
5.5.4  
Setting parameters  
The user can specify the optimal operation mode for the user system environments by setting the  
following parameters with the MODE SELECT or MODE SELECT EXTENDED command:  
Error recovery parameter  
Disconnection/reconnection parameter  
Caching parameter  
Control mode parameter  
With the MODE SELECT or MODE SELECT EXTENDED command, specify 1 for the "SP" bit on  
CDB to save the specified parameter value on the disk. This enables the IDD to operate by using the  
parameter value set by the user when power is turned on again. When the system has more than one  
INIT, different parameter value can be set for each INIT.  
When the parameters are not set or saved with the MODE SELECT or MODE SELECT  
EXTENDED command, the IDD sets the default values for parameters and operates when power is  
turned on or after reset. Although the IDD operations are assured with the default values, the  
operations are not always optimal for the system. To obtain the best performance, set the parameters  
in consideration of the system requirements specific to the user.  
This section outlines the parameter setting procedures. Refer to Chapter 3 of Fibre Channel Interface  
Specifications for further details of the MODE SELECT and MODE SELECT EXTENDED  
commands and specifying the parameters.  
1. At factory shipment of the IDD, the saving operation for the MODE  
SELECT parameter is not executed. So, if the user does not set  
parameters, the IDD operates according to the default value of each  
parameter  
2. The model select parameter is not saved for each Loop ID of but as the  
common parameter for all IDs. In the multi-INIT System, parameter  
setting cannot be changed for each INIT.  
3. Once parameters are saved, the saved value is effective as long as next  
saving operation is executed from the INIT. For example, even if the  
initialization of the disk is performed by the FORMAT UNIT command,  
the saved value of parameters described in this section is not affected.  
4. When the IDD, to which the saving operation has been executed on a  
system, is connected to another system, the user must pay attention to  
that the IDD operates according to the saved parameter value if the  
saving operation is not executed at installation.  
5. The saved value of the MODE SELECT parameter is assumed as the  
initial value of each parameter after the power-on, the RESET condition,  
or the BUS DEVICE RESET message. The INIT can change the  
parameter value temporary (actively) at any timing by issuing the MODE  
SELECT or MODE SELECT EXTENDED command with specifying "0"  
to the SP bit in the CDB.  
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5.5 Checking Operation after Installation and Preparing the IDD for Use  
(1)  
Error recovery parameter  
The following parameters are used to control operations such as IDD internal error recovery:  
a. Read/write error recovery parameters (page code = 1)  
Parameter  
Default value  
1 (enabled)  
• AWRE:  
• ARRE:  
Automatic alternate block allocation at Write  
operation  
Automatic alternate block allocation at read  
operation  
1 (enabled)  
• TB:  
Uncorrectable data transfer to the INIT  
Immediate correction of correctable error  
Report of recovered error  
1 (enabled)  
1 (enabled)  
0 (disabled)  
0 (Correction is  
enabled.)  
• EER:  
• PER:  
• DCR:  
Suppression of ECC error correction  
• Retry count at read operation  
• Retry count at write operation  
• Recovery time limit  
63  
63  
30 sec  
b. Verify error recovery parameters (page code = 7)  
Parameter  
Default value  
• ERR:  
• PER:  
• DTE:  
Immediate correction of recoverable error  
Report of recovered error  
Stop of command processing at successful  
error recovery  
1 (enabled)  
0 (disabled)  
0 (Processing is  
continued.)  
• DCR:  
Suppression of ECC error correction  
0 (Correction is  
enabled.)  
• Retry count at verification  
63  
c. Additional error recovery parameters (page code = 21)  
Parameter  
Default value  
15  
• Retry count at seek error  
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Installation  
Notes:  
1. The user can arbitrarily specify the following parameters according to the system  
requirements:  
ARRE  
AWRE  
TB  
PER  
2. The user also can arbitrarily specify parameters other than the above. However, it is  
recommended to use the default setting in normal operations.  
(2)  
Disconnection/reconnection parameters (page code = 2)  
The following parameters are used to optimize the start timing of reconnection processing to transfer  
data on the loop at a read (READ or READ EXTENDED command) or write operation (WRITE,  
WRITE EXTENDED, or WRITE AND VERIFY command) of the disk. Refer to Chapter 2 of Fibre  
Channel Interface Specifications for further details.  
Parameter  
Default value  
00 (HEX)  
• Buffer full ratio  
• Buffer empty ratio  
00 (HEX)  
Notes:  
1. In a system without the disconnection function, these parameters need not be specified.  
2. Determine the parameter values in consideration of the following performance factors of the  
system:  
Time required for reconnection processing  
Average amount of processing data specified with a command  
Refer to Chapter 2 of Fibre Channel Interface Specifications for how to obtain the rough  
calculation values for the parameter values to be set. It is recommended to evaluate the  
validity of the specified values by measuring performance in an operation status under the  
average system load requirements.  
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5.5 Checking Operation after Installation and Preparing the IDD for Use  
(3)  
Caching parameters  
The following parameters are used to optimize IDD Read-Ahead caching operations under the system  
environments. Refer to Chapter 2 of Fibre Channel Interface Specifications for further details.  
Parameter  
Initiator control  
Default value  
• IC:  
0 (Drive-specific  
control (page  
cache))  
• RCD:  
• WCE:  
• MS:  
Disabling Read-Ahead caching operations  
Write Cache Enable  
0 (enabled)  
1 (enabled)  
Specifying the multipliers of "minimum  
0 (Specifying  
prefetch" and "maximum prefetch" parameters  
absolute value)  
• DISC:  
Prefetch operation after track switching during  
prefetching  
1 (enabled)  
• Number of blocks for which prefetch is suppressed  
• Minimum prefetch  
X'FFFF'  
X'0000'  
• Maximum prefetch  
X' XXXX'  
(1 cache segment)  
• Number of blocks with maximum prefetch restrictions  
• Number of segments  
X'FFFF'  
X'08'  
Notes:  
1. When Read-Ahead caching operations are disabled by the caching parameter, these  
parameter settings have no meaning except write cache feature.  
2. Determine the parameters in consideration of how the system accesses the disk. When the  
access form is not determined uniquely because of the processing method, the parameters  
can be re-set actively.  
3. For sequential access, the effective access rate can be increased by enabling Read-Ahead  
caching operations and Write Cache feature.  
(4)  
Control mode parameters  
The following parameters are used to control the tagged queuing and error logging.  
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Installation  
a. Control mode parameters  
Parameter  
• Queue algorithm modifier  
Default value  
0 (Execution  
sequence of  
read/write  
commands is  
optimized.)  
• QErr:  
Resume or abort remaining suspended  
commands after sense pending state  
0 (command is  
resumed)  
• DQue:  
Disabling tagged command queuing  
0 (enabled)  
5.6  
Spare Disk Drive  
See Subsection 2.1.1, “Model name and order number,” to order a disk drive for replacement or as a  
spare  
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C141-E198  
CHAPTER 6  
Diagnostics and Maintenance  
6.1 Diagnostics  
6.2 Maintenance Information  
6.3 Operation Check  
6.4 Troubleshooting Procedures  
This chapter describes diagnostics and maintenance information.  
6.1  
Diagnostics  
6.1.1  
Self-diagnostics  
The IDD has the following self-diagnostic function. This function checks the basic operations of the  
IDD.  
Initial self-diagnostics  
Online self-diagnostics (SEND DIAGNOSTIC command)  
Table 6.1 lists the contents of the tests performed with the self-diagnostics. For a general check of  
the IDD including the operations of the host system and interface, use a test program that runs on the  
host system (see Subsection 6.1.2).  
Table 6.1  
Self-diagnostic functions  
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Diagnostics and Maintenance  
Brief test contents of self-diagnostics are as follows.  
a. Hardware function test  
This test checks the basic operation of the controller section, and contains following test.  
RAM (microcode is stored)  
Peripheral circuits of microprocessor (MPU)  
Memory (RAM)  
Data buffer  
b. Seek test  
This test checks the positioning operation of the disk drive using several seek modes (2 points  
seek, 1 position sequential seek, etc.). The positioning operation is checked with confirming the  
physical address information by reading the ID field (LBA) from the data block on track 0 after  
completion of the seek operation to the target cylinder.  
c. Write/read test  
This test checks the write/read function by using the Internal test space of the disk drive.  
(1)  
Initial self-diagnostics  
When power is turned on, the IDD starts initial self-diagnostics. The initial self-diagnostics checks  
the basic operations of the hardware functions.  
If an error is detected in the initial self-diagnostics, the IDD sends the Fault LED Out signal to the  
interface connector. In this status, the IDD posts the CHECK CONDITION status to all I/O  
operation requests other than the REQUEST SENSE command. When the CHECK CONDITION  
status is posted, the INIT should issue the REQUEST SENSE command. The sense data obtained  
with the REQUEST SENSE command details the error information detected with the initial self-  
diagnostics.  
Even if CHECK CONDITION status and sense data are posted, the IDD continues sending the Fault  
LED Out signal to the interface connector. Only when the power is turned off or re-turned on, this  
status can be cleared. When this status is cleared, the IDD executes the initial self-diagnosis again.  
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6.1 Diagnostics  
The IDD does not reply to the loop for up to 2 seconds after the initial self-diagnostics is started.  
After that, the IDD can accept the I/O operation request correctly, but the received command, except  
the executable commands under the not ready state (such as INQUIRY, START/STOP UNIT), is  
terminated with the CHECK CONDITION status (NOT READY [=2]/Logical unit is in process of  
becoming ready [=04-01] or Logical unit not ready, initializing command required [=04-02]) during  
the interval from the spindle motor becomes stable to the IDD becomes ready. The executable  
command under the not ready state is executed in parallel with the initial self-diagnostics, or is  
queued by the command queuing feature and is executed after completion of the initial self-  
diagnostics. When the command that comes under the exception condition of the command queuing  
is issued at that time, the IDD posts the BUSY status for the command. When the error is detected  
during the initial self-diagnostics, the CHECK CONDITION status is posted for all commands that  
were stacked during the initial self-diagnostics. For the command execution condition, refer to  
Section 1.4 and Subsection 1.7.4 in Fibre Channel Interface Specifications.  
(2)  
Online self-diagnostics (SEND DIAGNOSTIC command)  
The INIT can make the IDD execute self-diagnostics by issuing the SEND DIAGNOSTIC command.  
The INIT specifies the execution of self-diagnostics by setting 1 for the SelfTest bit on the CDB in the  
SEND DIAGNOSTIC command and specifies the test contents with the UnitOfl bit.  
When the UnitOfl bit on the CDB is set to 0, the IDD executes the hardware function test only once.  
When UnitOfl bit is set to 1, the IDD executes the hardware function test, seek (positioning) test, and  
data write/read test for the Internal test space only once.  
a. Error recovery during self-diagnostics  
During the self-diagnostics specified by the SEND DIAGNOSTIC command, when the  
recoverable error is detected during the seek or the write/read test, the IDD performs the error  
recovery according to the MODE SELECT parameter value (read/write error recovery parameter,  
additional error recovery parameter) which the INIT specifies at the time of issuing the SEND  
DIAGNOSTIC command.  
PER  
0
Operation of self-diagnostics  
The self-diagnostics continues when the error is recovered. The self-  
diagnostics terminates normally so far as the unrecoverable error is not  
detected.  
1
The self-diagnostics continues when the error is recovered. If the  
unrecoverable error is not detected, the consecutive tests are executed till last  
test but the self-diagnostics terminates with error. The error information  
indicates that of the last recovered error.  
b. Reporting result of self-diagnostics and error indication  
When all specified self-diagnostics terminate normally, the IDD posts the GOOD status for the  
SEND DIAGNOSTIC command.  
When an error is detected in the self-diagnostics, the IDD terminates the SEND DIAGNOSTIC  
command with the CHECK CONDITION status.  
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Diagnostics and Maintenance  
The INIT should issue the REQUEST SENSE command when the CHECK CONDITION status  
is posted. The sense data collected by the REQUEST SENSE command indicates the detail  
information of the error detected in the self-diagnostics.  
The IDD status after the CHECK CONDITION status is posted differs according to the type of  
the detected error.  
a) When an error is detected in the seek or write/read test, the subsequent command can be  
accepted correctly. When the command other than the REQUEST SENSE and NO  
OPERATION is issued from the same INIT, the error information (sense data) is cleared.  
b) When an error is detected in the hardware function test, the IDD posts the CHECK  
CONDITION status for all I/O operation request except the REQUEST SENSE command.  
The error status is not cleared even if the error information (sense data) is read. Only when  
the power is turned off or re-turned on, the status can be cleared. When this status is  
cleared, the IDD executes the initial self-diagnostics again (see item (1)).  
Refer to Chapter 3 of Fibre Channel Interface Specifications for further details of the command  
specifications.  
Data loss  
When the SEND DIAGNOSTIC command terminates with the CHECK  
CONDITION status, the INIT must collect the error information using  
the REQUEST SENSE command. The RECEIVE DIAGNOSTIC  
RESULTS command cannot read out the error information detected in  
the self-diagnostics.  
6.1.2  
Test programs  
The basic operations of the IDD itself can be checked with the self-diagnostic function. However, to  
check general operations such as the host system and interface operations in a status similar to the  
normal operation status, a test program that runs on the host system must be used.  
The structure and functions of the test program depend on the user system requirements. Generally,  
it is recommended to provide a general input/output test program that includes devices connected to  
the loop and input/output devices on other I/O ports.  
Including the following test items in the test program is recommended to test the IDD functions  
generally.  
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6.2 Maintenance Information  
(1)  
(2)  
(3)  
(4)  
Interface (loop) test  
The operations of the loop and data buffer on the IDD are checked with the WRITE BUFFER and  
READ BUFFER commands.  
Basic operation test  
The basic operations of the IDD are checked by executing self-diagnosis with the SEND  
DIAGNOSTIC command (see Subsection 6.1.1).  
Random/sequential read test  
The positioning (seek) operation and read operation are tested in random access and sequential  
access modes with the READ, READ EXTENDED, or VERIFY command.  
Write/read test  
By using a data block in the internal test space, the write/read test can be executed with an arbitrary  
pattern for a disk drive in which user data is stored.  
6.2  
Maintenance Information  
6.2.1  
Precautions  
Take the following precautions to prevent injury during maintenance and troubleshooting:  
1. To avoid injury, do not touch the mechanical assembly during disk drive  
operation.  
2. Do not use solvents to clean the disk drive.  
Take the following precautions to prevent disk drive damage during maintenance and  
troubleshooting:  
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6-5  
Diagnostics and Maintenance  
1. Always ground yourself with a wrist strap connected to ground before  
handling. ESD (Electrostatics Discharge) may cause the damage to the  
device.  
2. Do not remove a PCA.  
3. Do not use a conductive cleaner to clean a disk drive assembly.  
6.2.2  
Maintenance requirements  
(1)  
Preventive maintenance  
Preventive maintenance such as replacing air filters is not required.  
Damage  
Never open the disk enclosure in the field. Opening the disk enclosure  
in the field may cause an irreparable fault.  
(2)  
Service life  
See "(3) Service life," in Section 2.1.5.  
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6.2 Maintenance Information  
(3)  
(4)  
Parts that can be replaced in the field  
The PCA cannot be replaced in the field. The DE cannot be replaced in the field.  
Service system and repairs  
Fujitsu has the service system and repair facility for the disk drive. Contact Fujitsu representative to  
submit information for replacing or repairing the disk drive. Generally, the following information  
must be included:  
a) IDD model, part number (P/N), revision number, serial number (S/N), and date of manufacturing  
b) Error status  
Date when the error occurred  
System configuration  
Environmental conditions (temperature, humidity, and voltage)  
c) Error history  
d) Error contents  
Outline of inconvenience  
Issued commands and specified parameters  
Sense data  
Other error analysis information  
Data loss  
Save data stored on the disk drive before requesting repair. Fujitsu  
does not assume responsibility if data is destroyed during servicing or  
repair.  
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6-7  
Diagnostics and Maintenance  
See Section 5.1 for notes on packing and handling when returning the disk drive.  
6.2.3  
Maintenance levels  
If a disk drive is faulty, replace the whole disk drive since repair requires special tools and  
environment. This section explains the two maintenance levels.  
(1)  
Field maintenance (disk drive replacement)  
This replacement is done at the user's site.  
Replacement uses standard tools.  
Replacement is usually done by the user, retail dealer, distributor, or OEM engineer.  
(2)  
Factory maintenance (parts replacement)  
This replacement can only be done by Fujitsu.  
Replacement includes maintenance training and OEM engineer support. OEM engineers usually  
support retail dealers and distributors.  
Replacement uses factory tools and test equipment.  
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6.2 Maintenance Information  
6.2.4  
Revision numbers  
The revision number of the disk drive is represented with a letter and a number indicated on the  
revision label attached to the DE. Figure 6.1 shows the revision label format.  
Figure 6.1 Revision label (example)  
(1)  
(2)  
Indicating revision number at factory shipment  
When the disk drive is shipped from the factory, the revision number is indicated by deleting  
numbers in the corresponding letter line up to the corresponding number with = (see Figure 6.2).  
Changing revision number in the field  
To change the revision number because parts are replaced or other modification is applied in the  
field, the new level is indicated by enclosing the corresponding number in the corresponding letter  
line with ¡ (see Figure 6.2).  
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6-9  
Diagnostics and Maintenance  
When the revision number is changed after the drive is shipped from  
the factory, Fujitsu issues "Engineering Change Request/Notice" in  
which the new revision number is indicated. When the user changes  
the revision number, the user should update the revision label as  
described in item (2) after applying the modification.  
At shipment  
Rev. A2  
Revising at field  
Rev. A3  
Figure 6.2 Indicating revision numbers  
6.2.5  
6.2.6  
Tools and test equipment  
Disk drive troubleshooting and repair in the field require only standard hand tools. No special tools  
or test equipment are required.  
This manual does not describe the factory-level tools and test equipment.  
Tests  
This disk drive can be tested in the following ways:  
Initial seek operation check (See Subsection 6.3.1)  
Operation test (See Subsection 6.3.2)  
Diagnostic test (See Subsection 6.3.3)  
Figure 6.3 shows the flow of these tests.  
6-10  
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6.2 Maintenance Information  
Start  
Start self-test by  
turning the power on  
No  
Check host system  
(Table 6.2)  
Test results OK?  
Yes  
No  
Analyze system-related  
error  
Host system  
normal?  
Execute an operation  
test using a host  
computer or test  
equipment  
Yes  
Replaced or repair  
disk drive  
No  
Test results OK?  
No  
Disk drive  
normal?  
Yes  
Yes  
Continue operation  
Execute diagnostic  
test using a host  
computer or test  
equipment  
No  
Test results OK?  
Yes  
Test using voltage or  
temperature stress  
No  
Analyze disk drive  
error (Table 6.3)  
Test results OK?  
Yes  
Normal  
Figure 6.3 Test flowchart  
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6-11  
Diagnostics and Maintenance  
6.3  
Operation Check  
6.3.1  
Initial seek operation check  
If an error is detected during initialization by the initial seek operation check routine at power-on, the  
IDD sends the Fault LED Out signal to the interface connector. The spindle motor of the disk drive  
then stops, and the disk drive is unusable.  
For an explanation of the operation check before the initial seek, refer to the Section 5.5.  
6.3.2  
Operation test  
While the host computer is processing data, the IDD monitors disk drive operation including data  
processing, command processing, and seek operations. If the IDD detects an error, the IDD posts the  
error to the INIT. The INIT then posts the error to the user.  
The user may detect an intermittent or nonfatal error such as abnormal noise, abnormal odor, or very  
slow operation.  
An error posted in an operation test must be investigated. Replace the disk drive to see whether the  
error was caused by the disk drive.  
Often, errors posted in an operation test may be caused by the host system. Possible causes include  
insufficient power capacity, loose cable connection, insufficient timing or insufficient mechanical  
play, and problems related to other systems.  
If an operation error is detected by the error detection circuit of the disk drive, an interrupt occurs.  
The interrupt is posted to the MCU on the PCA. The MCU stops the currently processed command,  
and causes the CHECK CONDITION status to post the error to the INIT.  
When receiving the CHECK CONDITION status, the INIT issues a REQUEST SENSE command to  
collect detailed information about the error. The INIT then issues a REZERO UNIT command to  
return the read/write head to track 00. In normal processing, the IDD itself or INIT determines how  
to handle the error (processing retry or stop).  
To analyze the error posted in the operation test, reconstruct the conditions in which the error  
occurred. Then, start troubleshooting the whole host system by replacing the disk drive.  
6.3.3  
Diagnostic test  
The diagnostic test is executed to find a faulty subassembly in a faulty disk drive, or to check disk  
drive performance. This test is usually a combination of specific disk drive functions or group of  
functions. This test may be executed using a different host computers or test equipment and away  
from the environment where the error first occurred.  
To analyze the error posted in the diagnostic test, reconstruct the conditions in which the error  
occurred. Then, look for a possibly faulty subassembly or part of the disk drive.  
The procedures to be used in this test depend largely on the type of test equipment used, and are not  
covered by this manual.  
6-12  
C141-E198  
6.4 Troubleshooting Procedures  
6.4  
Troubleshooting Procedures  
6.4.1  
Outline of troubleshooting procedures  
This section explains the troubleshooting procedures for disk drive errors.  
Depending on the maintenance level, analyze the error to detect a possibly faulty part (disk drive, or  
disk drive part).  
Full-scale troubleshooting is usually required if the error cause is not known. If the error cause is  
clear (e.g., abnormal noise in disk enclosure or burning of a PCA), troubleshooting is straightforward.  
6.4.2  
Troubleshooting with disk drive replacement in the field  
At this level of maintenance, we recommend replacing the disk drive as a unit. If replacing the disk  
drive rectifies the fault, return the removed disk drive to the factory, for test and repair. If the newly  
installed disk drive does not rectify the fault another part of the system is faulty.  
Table 6.2 summarizes system-level field troubleshooting. Troubleshooting must be done in the field,  
to find faulty part (disk drive or system).  
C141-E198  
6-13  
Diagnostics and Maintenance  
Table 6.2  
System-level field troubleshooting  
Item  
DC power level  
Recommended work  
Check that the DC voltage is within the specified range ( 5%).  
Check that the +5 VDC value (pin of the interface connector) is 4.75 to  
5.25 VDC.  
Check that the +12 VDC supply (pin of the interface connector of disk  
drive) is 11.4 to 12.6 VDC.  
Electrical noise  
Make sure the maximum ripple peak-to-peak value of +5 VDC is within  
250 mV and +12 VDC is within 250 mV.  
Make sure the high frequency noise (over 20 MHz) is less than  
100 mVp-p.  
Drive selection address  
System cables  
Check that the disk drive selection address is set correctly.  
Check that all system cables are connected correctly.  
System diagnostic test  
When possible, execute the system level diagnostic routine as explained  
in the host computer manual. This gives a detailed report of a possible  
fault.  
Intermittent or nonfatal errors  
Check the AC voltage from the power supply. Check the DC voltage  
level at the power connector for the disk drive.  
If the AC voltage level is abnormal or there is a lot of electrical noise,  
notify the user of the error.  
If the DC voltage level is unstable, replace the power supply unit.  
If possible, replace the disk drive. If replacing the disk drive does not  
eliminate the error, the removed disk drive is probably not faulty. To  
continue error analysis, refer to the hardware and software manuals  
supplied with the system.  
6-14  
C141-E198  
6.4 Troubleshooting Procedures  
6.4.3  
Troubleshooting at the repair site  
For maintenance at this level, we recommend additional testing of the disk drive and signal checking.  
The sense data posted from the IDD helps with troubleshooting. This sense data makes the error type clear  
(functional, mechanical, or electrical error). Chapter 7 error analysis by sense data, and gives  
supplementary information on finding the error cause (faulty part).  
Table 6.3 lists how to detect a faulty disk drive subassembly. This fault finding requires a working  
host computer or disk drive test equipment to recreate the error conditions.  
If the detected error cannot be recreated in an ordinary test, disk drive conditions can be changed to  
force the error to recur. This is done by changing the DC voltage or the ambient temperature of the  
disk drive.  
If the error does not recur with changed conditions, the disk drive is not faulty. If no error occurs in  
the disk drive test, notify the user of the test results, and find out from the user the environment  
conditions where the disk drive is used.  
Table 6.3  
Disk drive troubleshooting  
Recommended action  
Item  
Frequent or repeated seek errors  
Collect sense data, and see Chapter 7.  
Replace the disk drive, and check that the test method is correct. If the  
error recurs, it is likely that the disk drive is normal but the test method  
is incorrect.  
Intermittent or nonfatal errors  
Replace the disk drive, and check that the test method is correct. If the  
error recurs, it is likely that the disk drive is normal but the test method  
is incorrect.  
To check performance, change the disk drive conditions by changing  
the voltage or temperature.  
If the disk drive error recurs or a possibly faulty part is found by troubleshooting, return the complete  
disk drive to the factory for repair. A media defect list must be included with a disk drive returned to  
the factory.  
If the possibly faulty part is the disk enclosure, return the whole disk drive to the factory for repair.  
Also if a clear error (erroneous servo track information or noisy drive) is detected in the disk  
enclosure, return the whole disk drive to the factory. A media defect list must be included with a disk  
drive returned to the factory.  
Damage  
Never open the disk enclosure in the field. Opening the disk enclosure  
may cause an irreparable fault.  
C141-E198  
6-15  
Diagnostics and Maintenance  
6.4.4  
Troubleshooting with parts replacement in the factory  
This manual does not cover troubleshooting at the factory level.  
6.4.5  
Finding possibly faulty parts  
Finding possibly faulty parts in the field was explained in Subsection 6.4.2. This manual does not  
cover finding possibly faulty parts at the factory level.  
6-16  
C141-E198  
CHAPTER 7  
Error Analysis  
7.1 Error Analysis Information Collection  
7.2 Sense Data Analysis  
This chapter explains in detail how sense data collected from a disk drive is used for troubleshooting. Sense  
data reflects an error in the disk drive, and helps with troubleshooting.  
A sense key, sense code, and subsense code, taken from various sense data are repeated. Also in this chapter,  
troubleshooting is performed using these three codes. Unless otherwise specified, "sense data" means the  
above three codes. When sense data is represented as (x-xx-xx), the leftmost x is a sense key, the middle xx is  
a sense code, and the rightmost x is a subsense code.  
7.1  
Error Analysis Information Collection  
Sense data  
7.1.1  
When IDD posts a CHECK CONDITION status or detects a fatal error in the loop, the current  
command or queued command is cleared. In such a case, the IDD generates sense data about the  
command-issuing INIT. The INIT can read the sense data by issuing a REQUEST SENSE  
command.  
Even if a transfer byte length that is shorter than the sense data length of the tested device is  
specified, the command terminates normally. In this case, however, the INIT receives part of the  
sense data, but the remaining part of the sense data is lost.  
For details of the REQUEST SENSE command, refer to the Fibre Channel Interface Specifications.  
7.1.2  
Sense key, sense code, and subsense code  
If an error is detected in a disk drive, the error status is indicated in the sense data collected from the  
disk drive. Figure 7.1 shows the positions of a sense key, sense code, and subsense code.  
C141-E198  
7-1  
Error Analysis  
Bit 7  
Byte 0 Valid  
1
6
0
5
4
3
2
1
0
X‘70’ or X‘71’ (error code)  
X‘00’  
2
3
0
ILI  
0
Sense key  
[MSB]  
4
Information  
5
6
[LSB]  
7
X‘28’ (additional sense data length)  
Command-specific information  
Basic  
information  
8
[MSB]  
9
10  
11  
12  
13  
14  
[LSB]  
Sense code  
Subsense code  
X‘00’  
15 SKSV  
16  
17  
Sense key-specific information  
18  
19  
20  
X
0
0
0
SCSI ID  
CDB operation code  
Additional  
information  
Detail information  
47  
Figure 7.1 Format of extended sense data  
7-2  
C141-E198  
7.2 Sense Data Analysis  
7.2  
Sense Data Analysis  
7.2.1  
Error information indicated with sense data  
Subsection 7.2.2 onwards explain troubleshooting using sense data.  
Table 7.1 lists the definition of sense data. For details of sense data, refer to the Fibre Channel  
Interface Specifications.  
Table 7.1  
Definition of sense data  
Sense data  
Sense  
key  
Sense  
Code  
Sub  
Sense  
Code  
Definition  
00  
3
00  
00  
03  
Operation was normal.  
0C  
A write to a disk terminated abnormally.  
4
32  
40  
44  
C4  
01  
xx  
xx  
xx  
Failed to update the defect list due to a disk medium write error, etc.  
An error occurred in power-on self-diagnosis.  
A hardware error occurred inside IDD.  
A drive error occurred.  
1
3
1x  
1x  
xx  
xx  
A disk read error occurred.  
A disk read error occurred.  
E
5
1D  
00  
Data discrepancy found by VERIFY command byte check.  
2x  
3D  
47  
xx  
00  
00  
00  
xx  
A SCSI error, such as an invalid operation code, occurred.  
The Reserve bit of the IDENTIFY message was set to 1.  
A CRC error occurred in the fibre channel loop.  
B
B
B
49  
An unmounted or inappropriate message was received.  
4D  
Before completion of a command, a command with the same tag  
number was issued.  
B
4E  
00  
An overlap command was issued.  
C141-E198  
7-3  
Error Analysis  
7.2.2  
Sense data (3-0C-03), (4-40-xx), (4-44-xx), and (4-C4-xx)  
Sense data (3-0C-03), (4-40-xx), (4-44-xx), and (4-C4-xx) indicate one of the following:  
A target sector could not be detected using the sector counter.  
A seek process overran the specified time.  
A write to a disk terminated abnormally.  
An error occurred in power-on self-diagnosis.  
A hardware error occurred inside IDD.  
A drive error occurred.  
The symptoms above are generally caused by an error in a PCA or DE.  
For details of the sense data above, refer to the Fibre Channel Interface Specifications.  
7.2.3  
Sense data (1-1x-xx), (3-1x-xx) and (E-1D-00): Disk read error  
If sense data (1-1x-xx), (3-1x-xx) or (E-1D-00) occurs frequently in a specific block of a disk, there  
is disk damage that was not recorded in the media defect list. In this case, assign an alternate block  
to the error-detected block using a REASSIGN BLOCKS command. For an explanation of the  
REASSIGN BLOCKS command, refer to the Fibre Channel Interface Specifications.  
If this error occurs in different blocks, a PCA or DE is faulty.  
For details of the above sense data, refer to the Fibre Channel Interface Specifications.  
7.2.4  
Sense data (5-2x-xx), (5-3D-00), (B-47-xx), (B-49-00), (B-4D-xx) and (B-4E-00): fibre channel  
interface error  
Sense data (5-2x-xx), (5-3D-00), (B-47-xx), (B-49-00), (B-4D-xx) and (B-4E-00) indicates one of  
the following symptoms:  
An invalid or unsupported command was issued, or invalid or unsupported parameters were  
specified.  
A SCSI error occurred.  
A CRC error occurred in the fibre channel loop.  
If this error occurs, a PCA or the fibre channel interface is faulty.  
For details of the above sense data, refer to the Fibre Channel Interface Specifications.  
7-4  
C141-E198  
APPENDIX A Connector Signal Allocation  
A.1 Interface (FC-SCA) Connector Signal Allocation  
This appendix describes the connector signal allocation.  
C141-E198  
A-1  
Connector Signal Allocation  
A.1  
Interface (FC-SCA) Connector Signal Allocation  
Table A.1  
FC-SCA connector: CN1  
Pin No.  
01  
Signal  
Signal  
Pin No.  
21  
–EN bypass port A  
+12V  
+12V charge  
GND  
02  
22  
03  
+12V  
GND  
23  
04  
+12V  
+PortA_in  
–PortA_in  
GND  
24  
05  
–Parallel ESI  
–Drive present  
Active LED out  
–Spindle sync  
Start_1/Mated  
Start_2/Mated  
–EN bypass port B  
25  
06  
26  
07  
+PortB_in  
–PortB_in  
GND  
27  
08  
28  
09  
29  
10  
+PortA_out  
–PortA_out  
GND  
30  
11  
31  
12*  
13*  
14*  
15*  
16  
SEL-6  
SEL-5  
SEL-4  
SEL-3  
–DSK_WR  
32  
–DSK_RD  
–ENCL_ACK  
D(3)  
+PortB-out  
–PortB-out  
GND  
33  
34  
35  
Fault LED out  
SEL-2  
SEL-1  
SEL-0  
D(2)  
D(1)  
D(0)  
36*  
37*  
38*  
39  
17  
DEV_CTRL_CODE2  
18  
DEV_CTRL_CODE1  
19  
+5V  
+5V  
DEV_CTRL_CODE0  
+5V charge  
20  
40  
Note: *1) Signal names in the right column of the table are those in parallel ESI operation.  
A-2  
C141-E198  
Glossary  
CCS  
CDB  
Common Command Set  
This is the standard form of SCSI logical specifications stipulated by the  
operations subcommittee of the American National Standards Institute (ANSI)  
which stipulates functions which a direct access device (magnetic disk, etc.)  
should support.  
Command Descriptor Block  
A series of data which describes commands related to input/output operations,  
sent from the initiator to the target.  
Command  
FC Device  
Initiator (INIT)  
SCSI  
This is a command to a target to perform an input/output operation, and it is  
described as the CDB.  
The general name given to a device which is connected to the FC bus  
(input/output device, I/O controller, host adapter, etc.).  
This is a SCSI device which initiates input and output operations on the SCSI bus.  
In this manual, initiator has been abbreviated to "INIT."  
Small Computer System Interface  
The standardized input/output interface of the American National Standards  
Institute (ANSI). [Standard No.: ANSI X3. 131-1986]  
Sense Code  
Sense Data  
This is a 1-byte code displayed in the sense data and is information which  
specifies the type of error that was detected.  
When several items of error information are included in a command's completion  
status, this is information generated by the target for reporting detailed  
information on that status.  
Sense Key  
Status  
This is a 4-bit code displayed in the sense data. It contains information for  
classifying the type of error that was detected.  
This is 1 byte of information reported to the initiator by the target device when  
execution of each command is completed, which displays the command's  
completion state.  
C141-E198  
GL-1  
Glossary  
Target (TARG)  
This is the FC device that executes the input/output operations initiated by the  
initiator (INIT). In this manual, target is abbreviated "TARG."  
GL-2  
C141-E198  
Acronyms and Abbreviations  
DTE  
Disable Transfer on Error  
A
ACK  
AEN  
ALT  
ACKnowledge  
Asynchoronous Event Notification  
ALTernated (block)  
E
ECC  
EER  
Error Correction Code  
Enable Early Recovery  
EVPD Enable Vital Product Data  
ARRE Automatic Read Reallocation  
Enabled  
ASCII American Standard Code for  
Information Interchange  
ASiGned block  
ATTeNtion  
F
ASG  
ATN  
FG  
FIFO  
Frame Ground  
First In First Out  
AWG American Wire Gauge  
AWRE Automatic Write Reallocation  
Enabled  
FmtData Format Data  
FOV  
FUA  
Format Options Valid  
Force Unit Access  
B
G
bpi  
BSY  
bits per inch  
BuSY  
G
G list  
Gap  
BytChk Byte Check  
Grown defect list  
C
H
C list  
C/D  
CCS  
CDB  
CE  
Target Certification list  
Control/data  
Common command set  
Common descriptor block  
Customer Engineer  
H
Height  
HSEC Hard SECtor  
I
CmpLst Complete List  
I/O  
ID  
IDD  
ILBN  
Input/Output  
IDentifier  
Intelligent Disk Drive  
CRC  
CSS  
CYL  
Cyclic Redundancy Check  
Contact Start Stop  
CYLinder  
Ideal Logical Block Number  
Immed Immediate  
INDX/SCT  
INDeX/SeCTor  
D
IP  
Initialization Pattern  
D
Depth  
ISG  
InterSector Gap  
D list  
DBD  
DC  
Data Defect List  
Disable Block Descriptor  
Direct Current  
L
DCR  
Disable Correction  
LBdata Logical Block data  
DCRT Disable CeRtificaTion  
DE  
DEF  
DevOfl Device Offline  
DPO Disable Page Out  
DPRY Disable PRimarY  
LBN  
LED  
LUN  
Logical Block Number  
Light Emitting Diode  
Logical Unit Number  
Disk Enclosure  
DEFective block  
DSP  
Disable Saving Parameters  
DTDC Data Transfer Disconnect Control  
C141-E198  
AB-1  
Acronyms and Abbreviations  
M
T
MR  
MS  
MSG  
Magnetro Resistive  
Multiple Select  
MeSsaGe  
TB  
TPI  
TRM  
Transfer Block  
Tracks Per Inch  
TeRMinator  
O
U
OEM  
Original Equipment Manufacturer  
UnitOfl Unit Offline  
P
V
P list  
P/N  
Primary defect list  
Parts/Number  
VCM  
VPD  
VU  
Voice Coil Motor  
Vital Product Data  
Vendor Unique  
PBdata Physical Block data  
PC boardPrinted Circuit board  
PCA  
PER  
PF  
Printed Circuit Assembly  
Post ERror  
Page Format  
W
W
WCE  
WP  
Width  
PLOSync Phase Lock Oscillator Syncronous  
PMI Partial Medium Indicator  
PR4ML Partial Response class 4 Maximum  
Likelihood  
Write Cache Enable  
Write Protect  
R
RC  
Read Continuous  
Read Cache Disable  
Request  
Relative Humidity  
ReMovaBle  
RCD  
REQ  
RH  
RMB  
RST  
RSV  
ReSeT  
ReSerVed  
S
S/N  
Serial/Number  
SBd  
SBi  
SCSI  
SCT  
SEL  
Synchronized Byte data area  
Synchronized Byte identifier area  
Small Computer System Interface  
SeCTor  
SELect  
SelfTest Self Test  
SG  
SP  
SPR  
Signal Ground  
Save Page  
SPaRe block  
Servo  
SR  
SSEC Soft SECtor  
STPF SToP Format  
SURF SURFace  
AB-2  
C141-E198  
Index  
+12 VDC ........................................................ 4-7  
1-1x-xx ........................................................... 7-4  
3-0C-03........................................................... 7-4  
3-1x-xx ........................................................... 7-4  
4-40-xx ........................................................... 7-4  
4-44-xx ........................................................... 7-4  
4-C4-xx........................................................... 7-4  
5-2x-xx ........................................................... 7-4  
5-3D-00 .......................................................... 7-4  
checking operation after installation  
and preparing IDD for use ........................ 5-6  
checking procedure......................................... 5-7  
checking IDD connection ........................5-8, 5-9  
command queuing feature .............................. 1-3  
compactness.................................................... 1-2  
connection requirement .................................. 4-9  
connector ........................................................ 4-9  
continuous block processing........................... 1-2  
controller circuit ............................................. 1-7  
current waveform............................................ 4-7  
cylinder configuration..................................... 3-1  
A
AC noise filter ................................................ 4-8  
actuator........................................................... 1-6  
air circulation.................................................. 1-6  
allowable input voltage and current................ 4-7  
alternate area................................................. 3-10  
alternate block allocation.............................. 3-11  
alternate block allocation by  
FORMAT UNIT command..................... 3-12  
alternate block allocation by  
REASSIGN BLOCKS command............ 3-13  
alternate block allocation during  
FORMAT UNIT command execution .... 3-12  
alternate cylinder ............................................ 3-5  
alternate spare area ......................................... 3-4  
automatic alternate block allocation............. 3-14  
automatic alternate block allocation  
at read operation...................................... 3-14  
automatic alternate block allocation  
at write operation .................................... 3-14  
automatic alternate block reassignment.......... 1-4  
D
data field ......................................................... 3-8  
data format...................................................... 3-1  
data security at power failure.......................... 2-7  
data space........................................................ 3-1  
defect list....................................................... 3-11  
defect management....................................... 3-11  
defective block slipping.................................. 1-4  
definition of sense data................................... 7-3  
delivery........................................................... 5-2  
diagnosis......................................................... 1-4  
diagnostic........................................................ 6-1  
diagnostic test ............................................... 6-12  
diagnostics and maintenance .......................... 6-1  
disconnection/reconnection parameter ......... 5-14  
disk ................................................................. 1-5  
disk drive replacement.................................... 6-8  
disk drive troubleshooting ............................ 6-15  
disk read error................................................. 7-4  
disk/head configuration .................................. 1-6  
dismounting drive........................................... 5-5  
dual-port support ............................................ 1-2  
B
B-47-xx........................................................... 7-4  
B-49-00........................................................... 7-4  
B-4D-xx.......................................................... 7-4  
B-4E-00 .......................................................... 7-4  
basic operation test ......................................... 6-5  
BCRC ............................................................. 3-8  
block address of user space .......................... 3-10  
block descriptor ............................................ 5-10  
E
E-1D-00 .......................................................... 7-4  
ECC ................................................................ 3-8  
enclosure service function .............................. 1-3  
environmental specification............................ 2-4  
environmental temperature............................. 4-5  
environmental/power requirement.................. 2-4  
error analysis................................................... 7-1  
error analysis information collection.............. 7-1  
error information indicated with sense data.... 7-3  
error rate ......................................................... 2-5  
error recovery ................................................. 1-3  
error recovery during self-diagnostic.............. 6-3  
error recovery parameter .............................. 5-13  
C
cache feature................................................... 1-3  
caching parameter......................................... 5-15  
changing revision number in field.................. 6-9  
checking at abnormal end............................. 5-10  
checking connection....................................... 5-7  
checking initial operation ............................... 5-6  
C141-E198  
IN-1  
Index  
example of FC-AL system configuration .......1-7  
external dimension..........................................4-1  
external magnetic field ...................................4-6  
low power consumption..................................1-5  
maintenance level ...........................................6-8  
maintenance requirement................................6-6  
microcode downloading..................................1-5  
MODE SELECT/MODE  
F
SELECT EXTENDED command ...........5-10  
model name and order number .......................2-1  
motor start mode.............................................5-3  
mounting.........................................................4-3  
mounting drive................................................5-4  
mounting frame structure................................4-3  
mounting procedure........................................5-4  
mounting requirement.....................................4-1  
MTBF..............................................................2-5  
MTTR .............................................................2-6  
factory maintenance........................................6-8  
FC model drives outer view............................1-5  
FC-AL standard ..............................................1-2  
FC-SCA connector......................................... A-2  
fibre channel interface error............................7-4  
field maintenance............................................6-8  
finding possibly faulty part...........................6-16  
format capacity ...............................................3-9  
format of extended sense data.........................7-2  
format parameter..................................5-10, 5-11  
FORMAT UNIT command ..........................5-11  
formatting .....................................................5-10  
function specification......................................2-2  
N
noise filter .......................................................4-8  
note on handling drive ....................................5-1  
note on mounting ............................................4-3  
G
gap ..................................................................3-8  
general description..........................................1-1  
general note.....................................................5-1  
O
online self-diagnostic......................................6-3  
operation check.............................................6-12  
operation test.................................................6-12  
other................................................................4-6  
outline of troubleshooting procedure............6-13  
H
hardware function test.....................................6-2  
hardware specification....................................2-1  
hardware structure ..........................................1-5  
head.................................................................1-6  
high speed positioning ....................................1-4  
high-speed data transfer..................................1-2  
P
packaging........................................................5-2  
PAD ................................................................3-8  
page code = 1................................................5-13  
page code = 2................................................5-14  
page code = 3................................................5-10  
page code = 7................................................5-13  
part replacement..............................................6-8  
part that can be replaced in field.....................6-7  
physical sector allocation................................3-5  
PLO Sync........................................................3-8  
positioning error rate.......................................2-5  
power on/off sequence....................................4-7  
power supply requirement ..............................4-7  
precaution .......................................................6-5  
preventive maintenance ..................................6-6  
programmable data block length.....................1-4  
programmable multi-segment data buffer.......1-2  
I
indicating revision number ...........................6-10  
indicating revision number at  
factory shipment........................................6-9  
initial seek operation check...........................6-12  
initial self-diagnostic.......................................6-2  
installation.......................................................5-1  
installation requirement ..................................4-1  
installation/removal/replacement....................5-2  
interface connector signal allocation ............. A-2  
interface test....................................................6-5  
internal test space............................................3-4  
L
large capacity..................................................1-4  
leak magnetic flux...........................................4-6  
limitation of bottom-mounting .......................4-5  
limitation of side-mounting ............................4-4  
logical data block addressing..........................3-9  
loop.................................................................6-5  
low noise and low vibration............................1-5  
R
random/sequential read test.............................6-5  
read/write circuit.............................................1-7  
read/write error recovery parameter..............5-13  
reliability.........................................................2-5  
reporting result of self-diagnostic and error  
indication...................................................6-3  
IN-2  
C141-E198  
Index  
reserve and release function ........................... 1-3  
revision label .................................................. 6-9  
revision number.............................................. 6-9  
system-level field troubleshooting................ 6-14  
T
take following action if problem occur........... 5-6  
test ................................................................ 6-10  
test flowchart ................................................ 6-11  
test program.................................................... 6-4  
tool and test equipment................................. 6-10  
track format .................................................... 3-5  
track skew and head skew............................... 3-6  
track skew/head skew ..................................... 3-7  
troubleshooting at repair site ........................ 6-15  
troubleshooting with disk drive  
S
sector format................................................... 3-7  
seek test .......................................................... 6-2  
self-diagnostic................................................. 6-1  
SEND DIAGNOSTIC command.................... 6-3  
sense data........................................................ 7-1  
sense data analysis.......................................... 7-3  
sense key, sense code, and subsense code...... 7-1  
sequential starting of spindle motor................ 4-7  
service clearance area..................................... 4-6  
service life ...............................................2-6, 6-6  
service system and repair................................ 6-7  
setting parameter .......................................... 5-12  
spare area in cell............................................. 3-5  
spare disk drive............................................. 5-16  
specification.................................................... 2-1  
spindle motor.................................................. 1-6  
standard feature .............................................. 1-2  
start/stop of spindle motor.............................. 1-4  
START/STOP UNIT command ..................... 5-6  
storage ............................................................ 5-2  
surface temperature check point..................... 4-5  
surface temperature measurement point......... 4-5  
sync mark ....................................................... 3-8  
system configuration ...................................... 1-7  
system space................................................... 3-4  
replacement in field................................. 6-13  
troubleshooting with part replacement  
in factory................................................. 6-16  
U
unpackaging.................................................... 5-2  
unrecoverable error rate.................................. 2-5  
user space........................................................ 3-3  
V
verify error recovery parameter.................... 5-13  
W
write/read test ..........................................6-2, 6-5  
C141-E198  
IN-3  
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