. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Barracuda 36ES2 Family:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST336918N
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST336938LW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST318418N
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST318438LW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Manual, Volume 1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Barracuda 36ES2 Family:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST336918N
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST336938LW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST318418N
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST318438LW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Manual, Volume 1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
© 2002 Seagate Technology LLC All rights reserved
Publication number: 100182971, Rev. B
May 2002
Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Technology LLC.
Barracuda, SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either registered trademarks or trademarks of
Seagate Technology LLC. Other product names are registered trademarks or trademarks of their owners.
Seagate reserves the right to change, without notice, product offerings or specifications. No part of this publica-
tion may be reproduced in any form without written permission of Seagate Technology LLC.
Revision status summary sheet
Revision
Date
Writer/Engineer
Sheets Affected
Rev. A
Rev. B
01/02/2002
05/13/2002
K. Schweiss/B. Hohn
K. Schweiss/B. Hohn
1/1, v thru ix, 1-84.
Pages 29, 41 and 46.
Notice.
Product Manual 100182971 is Volume 1 of a two-volume document with the SCSI interface information
in the SCSI Interface Product Manual, Volume 2, part number 75789509.
If you need the SCSI interface information, order the SCSI Interface Product Manual, Volume 2, part
number 75789509.
Barracuda 36ES2 Product Manual, Rev. B
v
Contents
Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Internal drive characteristics (transparent to user). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SCSI performance characteristics (visible to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Environmental interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Read errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Write errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Hot plugging Barracuda 36ES2 disc drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
12 V - Current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.4
vi
Barracuda 36ES2 Product Manual, Rev. B
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Effective altitude (sea level). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Notes for Figures 14 through 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
8.2.1 Air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
SCSI interface messages supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
SCSI bus conditions and miscellaneous features supported . . . . . . . . . . . . . . . . . . . . . . . . .55
Synchronous data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Synchronous data transfer periods supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
REQ/ACK offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
DC cable and connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
SCSI interface cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
9.7.1 Multimode—SE and LVD alternatives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Terminator requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
Terminator power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
10.0
Barracuda 36ES2 Product Manual, Rev. B
vii
List of Figures
Barracuda 36ES2 family drive (ST336938LW shown) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Location of HDA Temperature Check Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
LW mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
N mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 10. J6 jumper header for LW models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 11. J6 jumper header for N model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 12. J5 jumper header (on LW models only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 13. J2 option select header (for LW models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 14. J2 option select header (for N models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 15. Air flow (suggested) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 16. N model drive physical interface (50-pin SCSI I/O connector) . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Figure 17. LW model drive physical interface (68-pin J1 SCSI I/O connector) . . . . . . . . . . . . . . . . . . . . . . 59
Figure 18. Nonshielded 50-pin SCSI device connector used on N drives . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 19. SCSI daisy chain interface cabling for N drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Figure 20. Nonshielded 68 pin SCSI device connector used on LW drives . . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 21. SCSI daisy chain interface cabling for LW drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Figure 22. LVD output signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Barracuda 36ES2 Product Manual, Rev. B
1
1.0
Scope
This manual describes Seagate Technology® LLC Barracuda® 36ES2 disc drives.
Barracuda 36ES2 drives support the Small Computer System Interface (SCSI) as described in the ANSI SCSI
interface specifications to the extent described in this manual. The SCSI Interface Product Manual, part num-
ber 75789509, describes general SCSI interface characteristics of this and other families of Seagate drives.
From this point on in this product manual the reference to Barracuda 36ES2 models is referred to as “the drive”
unless references to individual models are necessary.
Figure 1.
Barracuda 36ES2 family drive (ST336938LW shown)
2
Barracuda 36ES2 Product Manual, Rev. B
Barracuda 36ES2 Product Manual, Rev. B
3
2.0
Applicable standards and reference documentation
The drive has been developed as a system peripheral to the highest standards of design and construction. The
drive depends upon its host equipment to provide adequate power and environment in order to achieve opti-
mum performance and compliance with applicable industry and governmental regulations. Special attention
must be given in the areas of safety, power distribution, shielding, audible noise control, and temperature regu-
lation. In particular, the drive must be securely mounted in order to guarantee the specified performance char-
acteristics. Mounting by bottom holes must meet the requirements of Section 8.3.
2.1
Standards
The Barracuda 36ES2 family complies with Seagate standards as noted in the appropriate sections of this
Manual and the Seagate SCSI Interface Product Manual, part number 75789509.
The Barracuda 36ES2 disc drive is a UL recognized component per UL1950, CSA certified to CSA C22.2 No.
950-95, and VDE certified to VDE 0805 and EN60950.
2.1.1
Electromagnetic compatibility
The drive, as delivered, is designed for system integration and installation into a suitable enclosure prior to
use. As such the drive is supplied as a subassembly and is not subject to Subpart B of Part 15 of the FCC
Rules and Regulations nor the Radio Interference Regulations of the Canadian Department of Communica-
tions.
The design characteristics of the drive serve to minimize radiation when installed in an enclosure that provides
reasonable shielding. As such, the drive is capable of meeting the Class B limits of the FCC Rules and Regula-
tions of the Canadian Department of Communications when properly packaged. However, it is the user’s
responsibility to assure that the drive meets the appropriate EMI requirements in their system. Shielded I/O
cables may be required if the enclosure does not provide adequate shielding. If the I/O cables are external to
the enclosure, shielded cables should be used, with the shields grounded to the enclosure and to the host con-
troller.
2.1.2
Electromagnetic susceptibility
As a component assembly, the drive is not required to meet any susceptibility performance requirements. It is
the responsibility of those integrating the drive within their systems to perform those tests required and design
their system to ensure that equipment operating in the same system as the drive or external to the system
does not adversely affect the performance of the drive. See Section 5.1.1 and Table 2, DC power requirements.
2.2
Electromagnetic compliance
Seagate uses an independent laboratory to confirm compliance to the directives/standard(s) for CE Marking
and C-Tick Marking. The drive was tested in a representative system for typical applications. The selected sys-
tem represents the most popular characteristics for test platforms. The system configurations include:
• Typical current use microprocessor
• 3.5-inch floppy disc drive
• Keyboard
• Monitor/display
• Printer
• External modem
• Mouse
Although the test system with this Seagate model complies to the directives/standard(s), we cannot guarantee
that all systems will comply. The computer manufacturer or system integrator shall confirm EMC compliance
and provide CE Marking and C-Tick Marking for their product.
Electromagnetic compliance for the European Union
If this model has the CE Marking it complies with the European Union requirements of the Electromagnetic
Compatibility Directive 89/336/EEC of 03 May 1989 as amended by Directive 92/31/EEC of 28 April 1992 and
Directive 93/68/EEC of 22 July 1993.
4
Barracuda 36ES2 Product Manual, Rev. B
Australian C-Tick
If this model has the C-Tick Marking it complies with the Australia/New Zealand Standard AS/NZS3548 1995
and meets the Electromagnetic Compatibility (EMC) Framework requirements of Australia’s Spectrum Man-
agement Agency (SMA).
Korean MIC
If this model has the Korean Ministry of Information and Communication (MIC) logo, it complies with paragraph
1 of Article 11 of the Electromagnetic Compatibility (EMC) Control Regulation and meets the Electromagnetic
Compatibility Framework requirements of the Radio Research Laboratory (RRL) Ministry of Information and
Communication Republic of Korea.
This drive has been tested and complies with the Electromagnetic Interference/Electromagnetic Susceptibility
(EMI/EMS) for Class B products.
• EUT name (model number): ST336938N, ST336918LW, ST318418N and ST318438LW.
• Certificate number: E-H011-01-4292 (B), E-H011-01-4293 (B), E-H011-01-5655 (B) and E-H011-01-5654 (B)
respectively.
• Trade name or applicant: Seagate Technology International
• Manufacturing start date: December 2001
• Manufacturer/nationality: Singapore
Taiwanese BSMI
If this model has two Chinese words meaning “EMC certification” followed by an eight digit identification num-
ber, as a Marking, it complies with Chinese National Standard (CNS) 13438 and meets the Electromagnetic
Compatibility (EMC) Framework requirements of the Taiwanese Bureau of Standards, Metrology, and Inspec-
tion (BSMI).
2.3
Reference documents
Barracuda 36ES2 Installation Guide
Safety and Regulatory Agency Specifications
SCSI Interface Product Manual
Seagate P/N 100182976
Seagate P/N 75789512
Seagate P/N 75789509
Applicable ANSI Small Computer System Interface (SCSI) document numbers:
T10/1143D
T10/1236D
T10/996D
T10/1157D
T10/1302D
Enhanced SCSI Parallel Interface (EPI)
Primary Commands-2 (SPC-2)
SCSI Block Commands (SBC)
SCSI Architectural Model-2 (SAM-2)
SCSI Parallel Interface (SPI-3)
SFF-8451, SCA-2 Unshielded Connections
Package Test Specification
Seagate P/N 30190-001 (under 100 lb.)
Seagate P/N 30191-001 (over 100 lb.)
Package Test Specification
Specification, Acoustic Test Requirements, and Procedures Seagate P/N 30553-001
In case of conflict between this document and any referenced document, this document takes precedence.
Barracuda 36ES2 Product Manual, Rev. B
5
3.0
General description
Barracuda 36ES2 drives combine giant magnetoresistive (GMR) heads, partial response/maximum likelihood
(PRML) read channel electronics, embedded servo technology, and a wide SCSI Ultra160 interface to provide
high performance, high capacity data storage for a variety of systems including engineering workstations, net-
work servers, mainframes, and supercomputers.
Ultra160 SCSI uses negotiated transfer rates. These transfer rates will occur only if your host adapter supports
these data transfer rates and is compatible with the required hardware requirements of the I/O circuit type. This
drive also operates at Ultra160 data transfer rates.
Table 1:
Drive model number vs. differentiating features
Number
of active
Number of I/O
Number of I/O Data buffer
Model number
heads
I/O circuit type [1]
connector pins data bus bits
size
ST336938LW
2
Single-ended (SE) and low
voltage differential (LVD)
68
16
2 Mbytes
ST336918N
2
2
Single-ended (SE)
50
68
8
2 Mbytes
2 Mbytes
ST318438LW
Single-ended (SE) and low
voltage differential (LVD)
16
ST318418N
2
Single-ended (SE)
50
8
2 Mbytes
The drive records and recovers data on approximately 3.74-inch (95 mm) non-removable discs.
The drive supports the Small Computer System Interface (SCSI) as described in the ANSI SCSI interface
specifications to the extent described in this manual (Volume 1), which defines the product performance char-
acteristics of the Barracuda 36ES2 family of drives, and the SCSI Interface Product Manual, part number
75789509, which describes the general interface characteristics of this and other families of Seagate SCSI
drives.
The drive’s interface supports multiple initiators, disconnect/reconnect, and automatic features that relieve the
host from the necessity of knowing the physical characteristics of the targets (logical block addressing is used).
The head and disc assembly (HDA) is sealed at the factory. Air circulates within the HDA through a non-
replaceable filter to maintain a contamination-free HDA environment.
Never disassemble the HDA and do not attempt to service items in the sealed enclosure (heads, media, actu-
ator, etc.) as this requires special facilities. The drive contains no replaceable parts. Opening the HDA voids
your warranty.
Barracuda 36ES2 drives use a dedicated landing zone at the innermost radius of the media to eliminate the
possibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the
landing zone when power is removed.
An automatic shipping lock prevents potential damage to the heads and discs that results from movement dur-
ing shipping and handling. The shipping lock automatically disengages when power is applied to the drive and
the head load process begins.
Barracuda 36ES2 drives decode track 0 location data from the servo data embedded on each surface to elimi-
nate mechanical transducer adjustments and related reliability concerns.
A high-performance actuator assembly with a low-inertia, balanced, patented, straight-arm design provides
excellent performance with minimal power dissipation.
6
Barracuda 36ES2 Product Manual, Rev. B
3.1
Standard features
The Barracuda 36ES2 family has the following standard features:
• Integrated Ultra160 SCSI controller
• Multimode SCSI drivers and receivers—single-ended (SE) and low voltage differential (LVD)
• 16 bit I/O data bus on LW models. 8 bit I/O data bus on the N model.
• Asynchronous and synchronous data transfer protocol
• Firmware downloadable via SCSI interface
• Selectable even-byte sector sizes from 512 to 4,096 bytes/sector
• Programmable sector reallocation scheme
• Flawed sector reallocation at format time
• Programmable auto write and read reallocation
• Reallocation of defects on command (post format)
• Enhanced ECC maximum burst correction length of 240 bits with a guaranteed burst correction length of
233 bits.
• Sealed head and disc assembly
• No preventative maintenance or adjustment required
• Dedicated head landing zone
• Embedded servo design
• Self diagnostics performed when power is applied to the drive
• 1:1 Interleave
• Zoned bit recording (ZBR)
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• 2,048 kbyte data buffer
• Drive Self Test (DST)
3.2
Media characteristics
The media used on the drive has a diameter of approximately 3.74 inches (95 mm). The aluminum substrate is
coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability
and environmental protection.
3.3
Performance
• Supports industry standard Ultra160 SCSI interface
• 7,200 RPM spindle. Average latency = 4.17 ms
• Command queuing of up to 64 commands
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
3.4
Reliability
• 800,000 hour MTBF
• LSI circuitry
• Balanced low mass rotary voice coil actuator
• Incorporates industry-standard Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.)
• 3-year warranty
Barracuda 36ES2 Product Manual, Rev. B
3.5 Unformatted and formatted capacities
7
Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per
sector. The following table shows the standard OEM model capacities:
Formatted
data block size
512 bytes/sector [1]
ST336938LW
ST336918N
ST318438LW
ST318418N
044D53B5h (36.954 GB) [2]
044D53B5h (36.954 GB) [2]
0251C800h (19.924 GB) [2]
0251C800h (19.924 GB) [2]
Notes.
[1] Sector size selectable at format time. Users having the necessary equipment may modify the data block
size before issuing a format command and obtain different formatted capacities than those listed. See
Mode Select command and Format command in the SCSI Interface Product Manual, part number
75789509.
[2] User available capacity depends on spare reallocation scheme selected, the number of data tracks per
sparing zone, and the number of alternate sectors (LBAs) per sparing zone.
3.6
Programmable drive capacity
Using the Mode Select command, the drive can change its capacity to something less than maximum. See the
Mode Select Parameter List table in the SCSI Interface Product Manual, part number 75789509. Refer to the
Parameter list block descriptor number of blocks field. A value of zero in the number of blocks field indicates
that the drive shall not change the capacity it is currently formatted to have. A number in the number of blocks
field that is less than the maximum number of LBAs changes the total drive capacity to the value in the block
descriptor number of blocks field. A value greater than the maximum number of LBAs is rounded down to the
maximum capacity.
3.7
Factory installed accessories
OEM Standard drives are shipped with the Barracuda 36ES2 Installation Guide, part number 100182976, and
the Safety and Regulatory Agency Specifications, part number 75789512, unless otherwise specified. The fac-
tory also ships with the drive a small bag of jumper plugs used for the J2, J5, and J6 option select jumper head-
ers.
3.8
Options (factory installed)
All customer requested options are incorporated during production or packaged at the manufacturing facility
before shipping. Some of the options available are (not an exhaustive list of possible options):
• Other capacities can be ordered depending on sparing scheme and sector size requested.
• Single unit shipping pack. The drive is normally shipped in bulk packaging to provide maximum protection
against transit damage. Units shipped individually require additional protection as provided by the single unit
shipping pack. Users planning single unit distribution should specify this option.
• The Barracuda 36ES2 Installation Guide, part number 100182976, is usually included with each standard
OEM drive shipped, but extra copies may be ordered.
• The Safety and Regulatory Agency Specifications, part number 75789512, is usually included with each
standard OEM drive shipped, but extra copies may be ordered.
8
Barracuda 36ES2 Product Manual, Rev. B
4.0
Performance characteristics
4.1
Internal drive characteristics (transparent to user)
ST336938/
ST336918
ST318438/
ST318418
Drive capacity
36.954
2
19.924
2
Gbytes (formatted, rounded off)
Read/write heads
Bytes/track
401
401
KBytes (average, rounded off)
Bytes/surface
18.477
56,332
58,480
480
18.477
26,000
58,480
480
Mbytes (unformatted, rounded off)
Tracks/surface (total)
Tracks/inch
Peak bits/inch
Tracks (user accessible)
TPI
KBPI
Internal data rate
Disc rotational speed
298-500
7,200
434-500
7,200
4.17
Mbits/sec (variable with zone)
r/min (+0.5%)
Average rotational latency 4.17
msec
4.2
SCSI performance characteristics (visible to user)
The values given in Section 4.2.1 apply to all models of the Barracuda 36ES2 family unless otherwise speci-
fied. Refer to Section 9.10 and to the SCSI Interface Product Manual, part number 75789509, for additional
timing details.
4.2.1
Access time [5]
Including controller overhead
Not including controller overhead
Drive level
Drive level
Read
Write
Read
Write
36 Gbyte Model
msec
msec
8.7
0.8
15.1
9.5
1.2
15.8
8.5
0.6
14.9
9.3
1.0
15.6
18 Gbyte Model
7.1
0.8
10.2
7.7
1.2
10.9
6.9
0.6
10.0
7.5
1.0
10.7
4.2.2
Format command execution time (minutes) [1]
ST336938, ST336918
ST318438, ST318418
Maximum (with verify)
Maximum (no verify)
46
23
4.2.3
Generalized performance characteristics
1 to 1
Minimum sector interleave
Data buffer transfer rate to/from disc media (one 512-byte sector):
Minimum [3]*
Average [3]
Maximum [3]
32.3 Mbytes/sec
45.9 Mbytes/sec
52.2 Mbytes/sec
Barracuda 36ES2 Product Manual, Rev. B
9
SCSI interface data transfer rate (asynchronous):
Maximum instantaneous one byte wide
Maximum instantaneous two bytes wide
5.0 Mbytes/sec [4]
10.0 Mbytes/sec [4]
Synchronous formatted transfer rate
Ultra2 SCSI
Ultra160 SCSI
In single-ended (SE) interface mode
In low voltage differential (LVD) interface mode
5.0 to 40 Mbytes/sec
5.0 to 80 Mbytes/sec
5.0 to 80 Mbytes/sec
5.0 to 160 Mbytes/sec
Sector Sizes:
Default
512 byte user data blocks
Variable
512 to 4,096 bytes per sector in even number of bytes per sector.
If n (number of bytes per sector) is odd, then n-1 will be used.
Read/write consecutive sectors on a track
Yes
Flaw reallocation performance impact (for flaws reallocated at format time using
the spare sectors per sparing zone reallocation scheme.)
Negligible
Average rotational latency
4.17 msec
[1] Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the
request for a Status Byte Transfer to the Initiator (excluding connect/disconnect).
[2] Typical access times are measured under nominal conditions of temperature, voltage, and horizontal ori-
entation as measured on a representative sample of drives.
[3] Assumes no errors and no sector has been relocated.
[4] Assumes system ability to support the rates listed and no cable loss.
[5] Access time = controller overhead + average seek time.
Access to data = controller overhead + average seek time + latency time.
4.3
Start/stop time
After DC power at nominal voltage has been applied, the drive becomes ready within 20 seconds if the Motor
Start Option is disabled (i.e. the motor starts as soon as the power has been applied). If a recoverable error
condition is detected during the start sequence, the drive executes a recovery procedure which may cause the
time to become ready to exceed 20 seconds. During spin up to ready time the drive responds to some com-
mands over the SCSI interface in less than 3 seconds after application of power. Stop time is less than 15 sec-
onds from removal of DC power.
If the Motor Start Option is enabled, the internal controller accepts the commands listed in the SCSI Interface
Product Manual less than 3 seconds after DC power has been applied. After the Motor Start Command has
been received the drive becomes ready for normal operations within 10 seconds typically (excluding an error
recovery procedure). The Motor Start Command can also be used to command the drive to stop the spindle
(see SCSI Interface Product Manual, part number 75789509).
There is no power control switch on the drive.
4.4
Prefetch/multi-segmented cache control
The drive provides prefetch (read look-ahead) and multi-segmented cache control algorithms that in many
cases can enhance system performance. “Cache” as used herein refers to the drive buffer storage space when
it is used in cache operations. To select prefetch and cache features the host sends the Mode Select command
with the proper values in the applicable bytes in Mode Page 08h (see SCSI Interface Product Manual, part
number 75789509). Prefetch and cache operation are independent features from the standpoint that each is
enabled and disabled independently via the Mode Select command. However, in actual operation the prefetch
All default cache and prefetch Mode parameter values (Mode Page 08h) for standard OEM versions of this
10
Barracuda 36ES2 Product Manual, Rev. B
4.5
Cache operation
In general, 2,048 Kbytes of the physical buffer space in the drive can be used as storage space for cache oper-
ations. The buffer can be divided into logical segments (Mode Select Page 08h, byte 13) from which data is
read and to which data is written. The drive maintains a table of logical block disk medium addresses of the
data stored in each segment of the buffer. If cache operation is enabled (RCD bit = 0 in Mode Page 08h, byte
2, bit 0. See SCSI Interface Product Manual, part number 75789509), data requested by the host with a Read
command is retrieved from the buffer (if it is there), before any disc access is initiated. If cache operation is not
enabled, the buffer (still segmented with required number of segments) is still used, but only as circular buffer
segments during disc medium read operations (disregarding Prefetch operation for the moment). That is, the
drive does not check in the buffer segments for the requested read data, but goes directly to the medium to
retrieve it. The retrieved data merely passes through some buffer segment on the way to the host. On a cache
miss, all data transfers to the host are in accordance with buffer-full ratio rules. On a cache hit the drive ignores
the buffer-full ratio rules. See explanations associated with Mode page 02h (disconnect/reconnect control) in
the SCSI Interface Product Manual.
The following is a simplified description of a read operation with cache operation enabled:
Case A - A Read command is received and the first logical block (LB) is already in cache:
1. Drive transfers to the initiator the first LB requested plus all subsequent contiguous LBs that are already in
the cache. This data may be in multiple segments.
2. When the requested LB is reached that is not in any cache segment, the drive fetches it and any remaining
requested LBs from the disc and puts them in a segment of the cache. The drive transfers the remaining
requested LBs from the cache to the host in accordance with the disconnect/reconnect specification men-
tioned above.
Case B - A Read command requests data, the first LB of which is not in any segment of the cache:
1. The drive fetches the requested LBs from the disc and transfers them into a segment, and from there to
the host in accordance with the disconnect/reconnect specification referred to in case A.
Each buffer segment is actually a self-contained circular storage area (wrap-around occurs), the length of
which is an integer number of disc medium sectors. The wrap-around capability of the individual segments
greatly enhances the buffer’s overall performance as a cache storage, allowing a wide range of user selectable
configurations, which includes their use in the prefetch operation (if enabled), even when cache operation is
disabled (see Section 4.5.2). The number of segments may be selected using the Mode Select command, but
the size can not be directly selected. Size is selected only as a by-product of selecting the segment number
specification. The size in Kbytes of each segment is not reported by the Mode Sense command page 08h,
bytes 14 and 15. The value 0x0000 is always reported. If a size specification is sent by the host in a Mode
Select command (bytes 14 and 15) no new segment size is set up by the drive, and if the STRICT bit in Mode
page 00h (byte 2, bit 1) is set to one, the drive responds as it does for any attempt to change unchangeable
parameters (see SCSI Interface Product Manual, part number 75789509). The drive supports operation of any
integer number of segments from 1 to 32. The default number of segments is defined in Tables 8 and 9.
4.5.1
Caching write data
Write caching is a write operation by the drive that makes use of a drive buffer storage area where the data to
be written to the medium is stored in one or more segments while the drive performs the write command.
If read caching is enabled (RCD=0), then data written to the medium is retained in the cache to be made avail-
able for future read cache hits. The same buffer space and segmentation is used as set up for read functions.
The buffer segmentation scheme is set up or changed independently, having nothing to do with the state of
RCD. When a write command is issued, if RCD=0, the cache is first checked to see if any logical blocks that
are to be written are already stored in the cache from a previous read or write command. If there are, the
respective cache segments are cleared. The new data is cached for subsequent Read commands.
If the number of write data logical blocks exceeds the size of the segment being written into, when the end of
the segment is reached, the data is written into the beginning of the same cache segment, overwriting the data
Barracuda 36ES2 Product Manual, Rev. B
11
that was written there at the beginning of the operation. However, the drive does not overwrite data that has not
yet been written to the medium.
If write caching is enabled (WCE=1), then the drive may return Good status on a write command after the data
has been transferred into the cache, but before the data has been written to the medium. If an error occurs
while writing the data to the medium, and Good status has already been returned, a deferred error will be gen-
erated.
The Synchronize Cache command may be used to force the drive to write all cached write data to the medium.
Upon completion of a Synchronize Cache command, all data received from previous write commands will have
been written to the medium.
4.5.2
Prefetch operation
If the Prefetch feature is enabled, data in contiguous logical blocks on the disc immediately beyond that which
was requested by a Read command can be retrieved and stored in the buffer for immediate transfer from the
buffer to the host on subsequent Read commands that request those logical blocks (this is true even if cache
operation is disabled). Though the prefetch operation uses the buffer as a cache, finding the requested data in
the buffer is a prefetch hit, not a cache operation hit. Prefetch is enabled using Mode Select page 08h, byte 12,
bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch. Since data that is prefetched replaces
data already in some buffer segment(s), the host can limit the amount of prefetch data to optimize system per-
formance. The max prefetch field (bytes 8 and 9) limits the amount of prefetch. The drive does not use the
Prefetch Ceiling field (bytes 10 and 11).
During a prefetch operation, the drive crosses a cylinder boundary to fetch more data only if the Discontinuity
(DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h.
Whenever prefetch (read look-ahead) is enabled (enabled by DRA = 0), it operates under the control of ARLA
(Adaptive Read Look-Ahead). If the host uses software interleave, ARLA enables prefetch of contiguous
blocks from the disc when it senses that a prefetch hit will likely occur, even if two consecutive read operations
were not for physically contiguous blocks of data (e.g., “software interleave”). ARLA disables prefetch when it
decides that a prefetch hit will not likely occur. If the host is not using software interleave, and if two sequential
read operations are not for contiguous blocks of data, ARLA disables prefetch, but as long as sequential read
operations request contiguous blocks of data, ARLA keeps prefetch enabled.
12
Barracuda 36ES2 Product Manual, Rev. B
Barracuda 36ES2 Product Manual, Rev. B
13
5.0
Reliability specifications
The following reliability specifications assume correct host/drive operational interface, including all interface
timings, power supply voltages, environmental requirements and drive mounting constraints (see Section 8.3).
Less than 10 in 108 seeks
Seek Errors
Read Error Rates [1]
Recovered Data
Unrecovered Data
Miscorrected Data
MTBF
Less than 10 errors in 1012 bits transferred (OEM default settings)
Less than 1 sector in 1015 bits transferred (OEM default settings)
Less than 1 sector in 1021 bits transferred
800,000 hours
3 years
Service Life
Preventive Maintenance
None required
Note.
[1] Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.
5.1 Error rates
The error rates stated in this specification assume the following:
• The drive is operated per this specification using DC power as defined in this manual (see Section 6.2).
• The drive has been formatted with the SCSI Format command.
• Errors caused by media defects or host system failures are excluded from error rate computations. Refer to
• Assume random data.
5.1.1
Environmental interference
When evaluating systems operation under conditions of Electromagnetic Interference (EMI), the performance
of the drive within the system shall be considered acceptable if the drive does not generate an unrecoverable
condition.
An unrecoverable error, or unrecoverable condition, is defined as one that:
• Is not detected and corrected by the drive itself;
• Is not capable of being detected from the error or fault status provided through the drive or SCSI interface; or
• Is not capable of being recovered by normal drive or system recovery procedures without operator interven-
tion.
5.1.2
Read errors
Before determination or measurement of read error rates:
• The data that is to be used for measurement of read error rates must be verified as being written correctly on
the media.
• All media defect induced errors must be excluded from error rate calculations.
5.1.3
Write errors
Write errors can occur as a result of media defects, environmental interference, or equipment malfunction.
Therefore, write errors are not predictable as a function of the number of bits passed.
If an unrecoverable write error occurs because of an equipment malfunction in the drive, the error is classified
as a failure affecting MTBF. Unrecoverable write errors are those which cannot be corrected within two
attempts at writing the record with a read verify after each attempt (excluding media defects).
5.1.4
Seek errors
A seek error is defined as a failure of the drive to position the heads to the addressed track. There shall be no
more than ten recoverable seek errors in 108 physical seek operations. After detecting an initial seek error, the
drive automatically performs an error recovery process. If the error recovery process fails, a seek positioning
14
Barracuda 36ES2 Product Manual, Rev. B
error (15h) is reported with a Medium error (3h) or Hardware error (4h) reported in the Sense Key. This is an
unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculations. Refer to
the SCSI Interface Product Manual, part number 75789509, for Request Sense information.
5.2
Reliability and service
You can enhance the reliability of Barracuda 36ES2 disc drives by ensuring that the drive receives adequate
cooling. Section 6.0 provides temperature measurements and other information that may be used to enhance
5.2.1
Mean time between failure
The production disc drive shall achieve an MTBF of 800,000 hours when operated in an environment that
ensures the case temperatures specified in Section 6.4.1 are not exceeded. Short-term excursions up to the
specification limits of the operating environment will not affect MTBF performance. Continual or sustained
operation at case temperatures above the values shown in Section 6.4.1 may degrade product reliability.
The MTBF target is specified as device power-on hours (POH) for all drives in service per failure.
Estimated power-on operating hours in the period
=
MTBF per measurement period
Number of drive failures in the period
Estimated power-on operation hours means power-up hours per disc drive times the total number of disc
drives in service. Each disc drive shall have accumulated at least nine months of operation. Data shall be cal-
culated on a rolling average base for a minimum period of six months.
MTBF is based on the following assumptions:
• 8,760 power-on hours per year.
• 250 average on/off cycles per year.
• Operations at nominal voltages.
• Systems will provide adequate cooling to ensure the case temperatures specified in Section 6.4.1 are not
exceeded.
Drive failure means any stoppage or substandard performance caused by drive malfunction.
A S.M.A.R.T. predictive failure indicates that the drive is deteriorating to an imminent failure and is considered
an MTBF hit.
5.2.2
Preventive maintenance
No routine scheduled preventive maintenance shall be required.
5.2.3
Service life
The drive shall have a useful service life of three years. Depot repair or replacement of major parts is permitted
during the lifetime (see Section 5.2.4)
5.2.4
Service philosophy
Special equipment is required to repair the drive HDA. In order to achieve the above service life, repairs must
be performed only at a properly equipped and staffed service and repair facility. Troubleshooting and repair of
PCBs in the field is not recommended, because of the extensive diagnostic equipment required for effective
servicing. Also, there are no spare parts available for this drive. Drive warranty is voided if the HDA is opened.
5.2.5
Service tools
No special tools are required for site installation or recommended for site maintenance. Refer to Section 5.2.4.
The depot repair philosophy of the drive precludes the necessity for special tools. Field repair of the drive is not
practical since there are no user purchasable parts in the drive.
Barracuda 36ES2 Product Manual, Rev. B
5.2.6 Hot plugging Barracuda 36ES2 disc drives
15
The ANSI SPI-3 (T10/1302D) document defines the physical requirements for removal and insertion of SCSI
devices on the SCSI bus. Four cases are addressed. The cases are differentiated by the state of the SCSI bus
when the removal or insertion occurs.
Case 1 - All bus devices powered off during removal or insertion
Case 2 - RST signal asserted continuously during removal or insertion
Case 3 - Current I/O processes not allowed during insertion or removal
Case 4 - Current I/O process allowed during insertion or removal, except on the device being changed
Seagate Barracuda 36ES2 disc drives support all four hot plugging cases. Provision shall be made by the sys-
tem such that a device being inserted makes power and ground connections prior to the connection of any
device signal contact to the bus. A device being removed shall maintain power and ground connections after
the disconnection of any device signal contact from the bus (see T10/1302D SPI-3 Annex C).
It is the responsibility of the systems integrator to assure that no hazards from temperature, energy, voltage, or
ESD potential are presented during the hot connect/disconnect operation.
All I/O processes for the SCSI device being inserted or removed shall be quiescent. All SCSI devices on the
bus shall have receivers that conform to the SPI-3 standard.
If the device being hot plugged uses single-ended (SE) drivers and the bus is currently operating in low voltage
differential (LVD) mode, then all I/O processes for all devices on the bus must be completed, and the bus qui-
esced, before attempting to hot plug. Following the insertion of the newly installed device, the SCSI host
adapter must issue a Bus Reset, followed by a synchronous transfer negotiation. Failure to perform the SCSI
Bus Reset could result in erroneous bus operations.
The SCSI bus termination and termination power source shall be external to the device being inserted or
removed.
End users should not mix devices with high voltage differential (HVD) drivers and receivers and devices with
SE, LVD, or multimode drivers and receivers on the same SCSI bus since the common mode voltages in the
HVD environment may not be controlled to safe levels for SE and LVD devices (see ANSI SPI-3).
The disc drive spindle must come to a complete stop prior to completely removing the drive from the cabinet
chassis. Use of the Stop Spindle command or partial withdrawal of the drive, enough to be disconnected from
the power source, prior to removal are methods for insuring that this requirement is met. During drive insertion,
care should be taken to avoid exceeding the limits stated in Section 6.4.4, "Shock and vibration" in this manual.
5.2.7
S.M.A.R.T.
S.M.A.R.T. is an acronym for Self-Monitoring Analysis and Reporting Technology. This technology is intended
to recognize conditions that indicate a drive failure and is designed to provide sufficient warning of a failure to
allow data back-up before an actual failure occurs.
Note. The firmware will monitor specific attributes for degradation over time but cannot predict instantaneous
drive failures.
Each attribute has been selected to monitor a specific set of failure conditions in the operating performance of
the drive, and the thresholds are optimized to minimize “false” and “failed” predictions.
Controlling S.M.A.R.T.
The operating mode of S.M.A.R.T. is controlled by the DEXCPT bit and the PERF bit of the “Informational
Exceptions Control Mode Page” (1Ch). The DEXCPT bit is used to enable or disable the S.M.A.R.T. process.
Setting the DEXCPT bit will disable all S.M.A.R.T. functions. When enabled, S.M.A.R.T. will collect on-line data
as the drive performs normal read/write operations. When the PERF bit is set, the drive is considered to be in
“On-line Mode Only” and will not perform off-line functions.
16
Barracuda 36ES2 Product Manual, Rev. B
The process of measuring off-line attributes and saving data can be forced by the RTZ command. Forcing
S.M.A.R.T. will reset the timer so that the next scheduled interrupt will be two hours.
The drive can be interrogated by the host to determine the time remaining before the next scheduled measure-
ment and data logging process will occur. This is accomplished by a log sense command to log page 0x3E.
The purpose is to allow the customer to control when S.M.A.R.T. interruptions occur. As described above, forc-
ing S.M.A.R.T by the Rezero Unit command will reset the timer.
Performance impact
S.M.A.R.T. attribute data will be saved to the disc for the purpose of recreating the events that caused a predic-
tive failure. The drive will measure and save parameters once every two hours subject to an idle period on the
SCSI bus. The process of measuring off-line attribute data and saving data to the disc is uninterruptable and
the maximum delay is summarized below:
Maximum processing delay
On-line only delay
DEXCPT = 0, PERF = 1
S.M.A.R.T. delay times ST336938: 150 msec
ST336918: 150 msec
Fully enabled delay
DEXCPT = 0, PERF = 0
ST336938: 270 msec
ST336918: 270 msec
ST318438: 270 msec
ST318418: 270 msec
ST318438: 150 msec
ST318418: 150 msec
Reporting control
Reporting is controlled in the Informational Exceptions Control Page (1Ch). Subject to the reporting method,
the firmware will issue a 01-5D00 sense code to the host. The error code is preserved through bus resets and
power cycles.
Determining rate
S.M.A.R.T. monitors the rate at which errors occur and signals a predictive failure if the rate of degraded error
rate increases to an unacceptable level. To determine rate, error events are logged and compared to the num-
ber of total operations for a given attribute. The interval defines the number of operations over which to mea-
sure the rate. The counter that keeps track of the current number of operations is referred to as the Interval
Counter.
S.M.A.R.T. measures error rate, hence for each attribute the occurrence of an error is recorded. A counter
keeps track of the number of errors for the current interval. This counter is referred to as the Failure Counter.
Error rate is simply the number of errors per operation. The algorithm that S.M.A.R.T. uses to record rates of
error is to set thresholds for the number of errors and the interval. If the number of errors exceeds the threshold
before the interval expires, then the error rate is considered to be unacceptable. If the number of errors does
not exceed the threshold before the interval expires, then the error rate is considered to be acceptable. In
either case, the interval and failure counters are reset and the process starts over.
Predictive failures
S.M.A.R.T. signals predictive failures when the drive is performing unacceptably for a period of time. The firm-
ware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accom-
plish this, a counter is incremented whenever the error rate is unacceptable and decremented (not to exceed
zero) whenever the error rate is acceptable. Should the counter continually be incremented such that it
reaches the predictive threshold, a predictive failure is signaled. This counter is referred to as the Failure His-
tory Counter. There is a separate Failure History Counter for each attribute.
5.2.8
Drive Self Test (DST)
Drive Self Test (DST) is a technology designed to recognize drive fault conditions that qualify the drive as a
failed unit. DST validates the functionality of the drive at a system level.
Barracuda 36ES2 Product Manual, Rev. B
17
There are two test coverage options implemented in DST:
1. extended test
2. short test
The most thorough option is the extended test that performs various tests on the drive and scans every logical
block address (LBA) of the drive. The short test is time-restricted and limited in length—it does not scan the
entire media surface, but does some fundamental tests and scans portions of the media.
If DST encounters an error during either of these tests, it reports a fault condition. If the drive fails the test,
remove it from service and return it to Seagate for service.
5.2.8.1
DST Failure Definition
The drive will present a “diagnostic failed” condition through the self-tests results value of the diagnostic log
page if a functional failure is encountered during DST. The channel and servo parameters are not modified to
test the drive more stringently, and the number of retries are not reduced. All retries and recovery processes
are enabled during the test. If data is recoverable, no failure condition will be reported regardless of the number
of retries required to recover the data.
The following conditions are considered DST failure conditions:
• Seek error after retries are exhausted
• Track-follow error after retries are exhausted
• Read error after retries are exhausted
• Write error after retries are exhausted
Recovered errors will not be reported as diagnostic failures.
5.2.8.2
Implementation
This section provides all of the information necessary to implement the DST function on this drive.
5.2.8.2.1
State of the drive prior to testing
The drive must be in a ready state before issuing the Send Diagnostic command. There are multiple reasons
why a drive may not be ready, some of which are valid conditions, and not errors. For example, a drive may be
in process of doing a format, or another DST. It is the responsibility of the host application to determine the “not
ready” cause.
While not technically part of DST, a Not Ready condition also qualifies the drive to be returned to Seagate as a
failed drive.
A Drive Not Ready condition is reported by the drive under the following conditions:
• Motor will not spin
• Motor will not lock to speed
• Servo will not lock on track
• Drive cannot read configuration tables from the disc
In these conditions, the drive responds to a Test Unit Ready command with an 02/04/00 or 02/04/03 code.
5.2.8.2.2
Invoking DST
To invoke DST, submit the Send Diagnostic command with the appropriate Function Code (001b for the short
test or 010b for the extended test) in bytes 1, bits 5, 6, and 7. Refer to the SCSI Interface Product Manual, part
number 75789509, for additional information about invoking DST.
5.2.8.2.3
Short and extended tests
The short and extended test options are described in the following two subsections.
Each test consists of three segments: an electrical test segment, a servo test segment, and a read/verify scan
segment.
18
Barracuda 36ES2 Product Manual, Rev. B
Short test (Function Code: 001b)
The purpose of the short test is to provide a time-limited test that tests as much of the drive as possible within
120 seconds. The short test does not scan the entire media surface, but does some fundamental tests and
scans portions of the media. A complete read/verify scan is not performed and only factual failures will report a
fault condition. This option provides a quick confidence test of the drive.
Extended test (Function Code: 010b)
The objective of the extended test option is to empirically test critical drive components. For example, the seek
tests and on-track operations test the positioning mechanism. The read operation tests the read head element
and the media surface. The write element is tested through read/write/read operations. The integrity of the
media is checked through a read/verify scan of the media. Motor functionality is tested by default as a part of
these tests.
The anticipated length of the Extended test is reported through the Control Mode page.
5.2.8.2.4
Log page entries
When the drive begins DST, it creates a new entry in the Self-test Results Log page. The new entry is created
by inserting a new self-test parameter block at the beginning of the self-test results log parameter section of the
log page. Existing data will be moved to make room for the new parameter block. The drive reports 20 param-
eter blocks in the log page. If there are more than 20 parameter blocks, the least recent parameter block will be
deleted. The new parameter block will be initialized as follows:
1. The Function Code field is set to the same value as sent in the DST command
2. The Self-Test Results Value field is set to Fh
3. The drive will store the log page to non-volatile memory
After a self-test is complete or has been aborted, the drive updates the Self-Test Results Value field in its Self-
Test Results Log page in non-volatile memory. The host may use Log Sense to read the results from up to the
last 20 self-tests performed by the drive. The self-test results value is a 4-bit field that reports the results of the
test. If the field is zero, the drive passed with no errors detected by the DST. If the field is not zero, the test
failed for the reason reported in the field.
The drive will report the failure condition and LBA (if applicable) in the Self-test Results Log parameter. The
Sense key, ASC, ASCQ, and FRU are used to report the failure condition.
5.2.8.2.5
Abort
There are several ways to abort a diagnostic. You can use a SCSI Bus Reset or a Bus Device Reset message
to abort the diagnostic.
You can abort a DST executing in background mode by using the abort code in the DST Function Code field.
This will cause a 01 (self-test aborted by the application client) code to appear in the self-test results values
log. All other abort mechanisms will be reported as a 02 (self-test routine was interrupted by a reset condition).
5.2.9
Product warranty
Beginning on the date of shipment to customer and continuing for a period of three years, Seagate warrants
that each product (including components and subassemblies) or spare part that fails to function properly under
normal use due to defect in materials, workmanship, or due to nonconformance to the applicable specifications
will be repaired or replaced, at Seagate’s option and at no charge to customer, if returned by customer at cus-
tomer’s expense to Seagate’s designated facility in accordance with Seagate’s warranty procedure. Seagate
will pay for transporting the repair or replacement item to customer. For more detailed warranty information
refer to the Standard terms and conditions of Purchase for Seagate products.
Shipping
When transporting or shipping a drive, a Seagate approved container must be used. Keep your original box.
They are easily identified by the Seagate-approved package label. Shipping a drive in a non-approved con-
tainer voids the drive warranty.
Barracuda 36ES2 Product Manual, Rev. B
19
Seagate repair centers may refuse receipt of components improperly packaged or obviously damaged in tran-
sit. Contact your Authorized Seagate Distributor to purchase additional boxes. Seagate recommends shipping
by an air-ride carrier experienced in handling computer equipment.
Product repair and return information
Seagate customer service centers are the only facilities authorized to service Seagate drives. Seagate does
not sanction any third-party repair facilities. Any unauthorized repair or tampering with the factory-seal voids
the warranty.
20
Barracuda 36ES2 Product Manual, Rev. B
Barracuda 36ES2 Product Manual, Rev. B
21
6.0
Physical/electrical specifications
This section provides information relating to the physical and electrical characteristics of the Barracuda 36ES2
drive.
6.1
AC power requirements
None.
6.2
DC power requirements
The voltage and current requirements for a single drive are shown in the following table. Values indicated apply
at the drive power connector. The table shows current values in Amperes.
Table 2:
DC power requirements
ST336938
ST336918
ST318438
ST318418
ST336938
LVD mode
ST318438
LVD mode
Notes
SE mode
SE mode
Voltage
+5 V
+12 V
5%[2]
0.31
+5 V
+12 V
+5 V
+12 V
5%[2]
0.31
+5 V
+12 V
Regulation
5%
5%
5%[2]
0.31
5%
5%
5%[2]
0.31
Maximum starting current
0.77
0.77
0.78
0.78
(peak DC) DC
0.84
0.66
2.02
0.03
0.86
0.66
2.02
0.03
0.83
0.63
2.05
0.03
0.82
0.63
2.05
0.03
Delayed motor start
(max) DC
Peak operating current
DCX
Maximum DC
Maximum (peak)
1.11
1.14
1.78
0.72
0.73
1.74
1.11
1.14
1.78
0.72
0.73
1.74
1.15
1.17
1.80
0.65
0.66
1.76
1.16
1.17
1.78
0.65
0.66
1.76
[1] Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks
will exceed these values. Power supply at nominal voltage. Number of units tested = 6 at ambient.
[2] For +12 V, a –10% tolerance is permissible during initial start of spindle, and must return to 5% before
7,200 rpm is reached. The 5% must be maintained after the drive signifies that its power-up sequence
has been completed and that the drive is able to accept selection by the host initiator.
[4] This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start
Motor command.
[5] See Section 6.2.1 “Conducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,
and transient response.
[6] Operating condition is defined as 8 random block reads at 133 I/Os per second. Current and power spec-
ified at nominal voltages. Decreasing +5 volts by 5% increases +5 volt current by 4%.
[7] During idle, the drive heads are relocated every 60 seconds to a random location within the band from
track zero to one-fourth of maximum track.
1. Minimum current loading for each supply voltage is not less than 1.5% of the maximum operating current
shown.
2. The +5 and +12 volt supplies shall employ separate ground returns.
3. Where power is provided to multiple drives from a common supply, careful consideration for individual
drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak
starting current must be available to each device.
4. Parameters, other than spindle start, are measured after a 10-minute warm up.
5. No terminator power.
22
Barracuda 36ES2 Product Manual, Rev. B
6.2.1
Conducted noise immunity
Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz.
Maximum allowed noise values given below are peak to peak measurements and apply at the drive power con-
nector.
+5 V = 150 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz
+12 V = 150 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz
6.2.2
Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down. Daisy-chain operation requires that power be maintained on the SCSI bus terminator to ensure
proper termination of the peripheral I/O cables. To automatically delay motor start based on the target ID (SCSI
ID) enable the Delay Motor Start option and disable the Enable Motor Start option on the J2 connector. See
Section 8.1 for pin selection information. To delay the motor until the drive receives a Start Unit command,
enable the Enable Remote Motor Start option on the J2 connector.
6.2.3
12 V - Current profile
Figure 2 identifies the drive +12 V current profiles. The current during the various times is as shown:
T0 - Power is applied to the drive.
T1 - Controller self tests are performed.
T2 - Spindle begins to accelerate under current limiting after performing drive internal
diagnostics. See Note 1 of Table 2.
T3 - The spindle is up to speed and the head-arm restraint is unlocked.
T4 - The adaptive servo calibration sequence is performed.
T5 - Calibration is complete and drive is ready for reading and writing.
+12 Volt Current during spindle start — Typical Amperes
AC Envelope
2.5
2.0
DC average of waveform
A
1.5
1.0
0.5
0.0
T0
0.0
2
4
6
8
10
12
14
16
Seconds
Figure 2.
Typical ST336938/ST336918/ST318438/ST318418 drive +12 V current profile
24
Barracuda 36ES2 Product Manual, Rev. B
6.3
Power dissipation
ST336938/ST318438
The drives typical power dissipation under idle conditions is 8.0 watts (27.3 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
4). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by
3.4123.
1.800
5V A
12V A
Watts
21.0
12.0
1.600
1.400
1.200
17.0
15.0
1.000
0.800
0.600
0.400
Watts
13.0
11.0
9.0
0
50
100
150
I/Os per Second
Figure 4.
ST336938/ST318438 DC current and power vs. input/output operations per second (LVD)
Barracuda 36ES2 Product Manual, Rev. B
25
ST336918/ST318418
The drives typical power dissipation under idle conditions is 8.0 watts (27.3 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 5). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the correspond-
ing +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply
watts by 3.4123.
1.800
5V A
12V A
Watts
1.600
1.400
1.200
21.0
19.0
17.0
15.0
13.0
11.0
9.0
1.000
0.800
0.600
0.400
Watts
0
50
100
150
I/Os per Second
Figure 5.
ST336918/ST318418 DC current and power vs. input/output operations per second (SE)
26
Barracuda 36ES2 Product Manual, Rev. B
6.4
Environmental limits
Temperature and humidity values experienced by the drive must be such that condensation does not occur on
any drive part. Altitude and atmospheric pressure specifications are referenced to a standard day at 58.7°F
(14.8°C). Maximum wet bulb temperature is 86°F (30°C).
6.4.1
Temperature
a. Operating
With cooling designed to maintain the case temperature, the drive meets all specifications over a 41°F to
131°F (5°C to 55°C) drive ambient temperature range with a maximum temperature gradient of 36°F (20°C)
per hour. The enclosure for the drive should be designed such that the temperature at the location specified
in Note [3] is not exceeded. Air flow may be needed to achieve these temperature values (see Note [1]).
Operation at case temperatures above these values may adversely affect the drives ability to meet specifi-
cations.
The MTBF specification for the drive is based on operating in an environment that ensures that the case
temperature is not exceeded. Occasional excursions to drive ambient temperatures of 131°F (55°C) or
41°F (5°C) may occur without impact to specified MTBF. Air flow may be needed to achieve these tempera-
tures (see Note [1]). The maximum allowable continuous or sustained temperature for rated MTBF is 113°F
(45°C).
To confirm that the required cooling for the drive is provided, place the drive in its final mechanical configu-
ration, perform random write/read operations. After the temperatures stabilize, measure the case tempera-
The maximum allowable HDA case temperature is 50°C. Operation of the drive at the maximum case tem-
perature is intended for short time periods only. Continuous operation at the elevated temperatures will
reduce product reliability.
Notes.
[1] Section 8.2.1 describes the air-flow patterns to be used to meet HDA temperature. Air flow was oppo-
site that shown in Section 8.2.1. Air velocity should be adequate to ensure that the HDA temperature is
not exceeded during drive operation.
[2] The temperatures in columns 1 and 2 are calculated and may not reflect actual operating values. Suf-
ficient cooling is required to ensure that these values are not exceeded.
b. Non-operating
–40° to 163°F (–40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This
specification assumes that the drive is packaged in the shipping container designed by Seagate for use with
drive.
HDA Temperature
Check Point
.5"
2.0"
Figure 6.
Location of HDA Temperature Check Point
Barracuda 36ES2 Product Manual, Rev. B
6.4.2 Relative humidity
27
The values below assume that no condensation on the drive occurs.
a. Operating
5% to 90% non-condensing relative humidity with a maximum gradient of 30% per hour.
b. Non-operating
5% to 95% non-condensing relative humidity.
6.4.3
Effective altitude (sea level)
a. Operating
–1000 to +10,000 feet (–305 to +3,048 meters)
b. Non-operating
–1000 to +40,000 feet (–305 to +12,210 meters)
6.4.4
Shock and vibration
Shock and vibration limits specified in this document are measured directly on the drive chassis. If the drive is
installed in an enclosure to which the stated shock and/or vibration criteria is applied, resonances may occur
internally to the enclosure resulting in drive movement in excess of the stated limits. If this situation is apparent,
it may be necessary to modify the enclosure to minimize drive movement.
The limits of shock and vibration defined within this document are specified with the drive mounted by any of
the four methods shown in Figure 7, and in accordance with the restrictions of Section 8.3. Orientation of the
side nearest the LED may be up or down.
6.4.4.1
Shock
a. Operating—normal
The drive, as installed for normal operation, shall operate error free while subjected to intermittent shock not
exceeding 63 Gs at a maximum duration of 2 msec (half sinewave). Shock may be applied in the X, Y, or Z
axis.
b. Non-operating
The limits of non-operating shock shall apply to all conditions of handling and transportation. This includes
both isolated drives and integrated drives.
The drive subjected to non-repetitive shock not exceeding 200 Gs at a maximum duration of 2 msec (half
sinewave) does not exhibit device damage or performance degradation. Shock may be applied in the X, Y,
or Z axis.
The drive subjected to a single-event shock not exceeding 350 Gs at a maximum duration of 2 msec (half
sinewave) does not exhibit device damage or performance degradation. Shock may be applied in the X, Y,
or Z axis.
c. Packaged
Disc drives shipped as loose load (not palletized) general freight will be packaged to withstand drops from
heights as defined in the table below. For additional details refer to Seagate specifications 30190-001
(under 100 lbs/45 kg) or 30191-001 (over 100 lbs/45 Kg).
Package size
Packaged/product weight
Drop height
<600 cu in (<9,800 cu cm)
Any
60 in (1524 mm)
48 in (1219 mm)
42 in (1067 mm)
36 in (914 mm)
600-1800 cu in (9,800-19,700 cu cm)
>1800 cu in (>19,700 cu cm)
>600 cu in (>9,800 cu cm)
0-20 lb (0 to 9.1 kg)
0-20 lb (0 to 9.1 kg)
20-40 lb (9.1 to 18.1 kg)
Drives packaged in single or multipacks with a gross weight of 20 pounds (8.95 kg) or less by Seagate for
general freight shipment shall withstand a drop test from 48 inches (1,070 mm) against a concrete floor or
equivalent.
Barracuda 36ES2 Product Manual, Rev. B
29
6.4.4.2
Vibration
a. Operating—Normal
The drive as installed for normal operation, shall comply with the complete specified performance while
subjected to continuous vibration not exceeding
10-300 Hz @ 0.004 g2/Hz PSD
Vibration may be applied in the X, Y, or Z axis.
b. Operating—Abnormal
Equipment as installed for normal operation shall not incur physical damage while subjected to periodic
vibration not exceeding:
22-350 Hz @ 0.5 G (zero to peak)
Vibration may be applied in the X, Y, or Z axis.
Vibration occurring at these levels may degrade operational performance during the abnormal vibration
period. Specified operational performance will continue when normal operating vibration levels are
resumed. This assumes system recovery routines are available.
c. Non-operating
The limits of non-operating vibration shall apply to all conditions of handling and transportation. This
includes both isolated drives and integrated drives.
The drive shall not incur physical damage or degraded performance as a result of continuous vibration not
exceeding
22-350 Hz @ 2.0 G (zero to peak)
Vibration may be applied in the X, Y, or Z axis.
6.4.5
Air cleanliness
The drive is designed to operate in a typical office environment with minimal environmental control.
6.4.6
Acoustics
Sound power during idle mode shall be 2.0 bels typical when measured to ISO 7779 specification.
There will not be any discrete tones more than 10 dB above the masking noise on typical drives when mea-
sured according to Seagate specification 30553-001. There will not be any tones more than 24 dB above the
masking noise on any drive.
6.4.7
Electromagnetic susceptibility
See Section 2.1.2.
30
Barracuda 36ES2 Product Manual, Rev. B
6.5
Mechanical specifications
The following nominal dimensions are exclusive of the decorative front panel accessory. However, dimensions
of the front panel are shown in figure below. Refer to Figures 8 and 9 for detailed mounting configuration
Height:
Width:
Depth:
Weight:
1.000 in
4.000 in
5.75 in
25.40 mm
101.60 mm
146.05 mm
1.2 pounds (ST336938) 0.54 kilograms
S
// T -Z-
-Z-
[1]
L
J
H
B
Notes:
Mounting holes are 6-32 UNC 2B, three
[1]
on each side and four on the bottom.
Max screw penetration into side of drive
is 0.15 in. (3.81 mm). Max screw
tightening torque is 6.0 in-lb (3.32 nm)
with minimum full thread engagement of
0.12 in. (3.05 mm).
A
R
-Z-
M
C
Dimension Table
U -X-
Inches
Millimeters
A
B
C
D
E
F
G
H
J
K
L
M
P
R
S
T
1.028 max
5.787 max
4.000 – .010
3.750 – .010
.125 – .010
1.750 – .010
1.625 – .020
1.122 – .020
4.000 – .010
.250 – .010
1.638 – .010
.181 – .020
1.625 – .020
.265 – .010
.315 – .040
.015 max
26.10 max
147.00 max
101.60 – .25
95.25 – .25
3.18 – .25
44.45 – .25
41.28 – .50
28.50 – .50
101.60 – .25
6.35 – .25
41.60 – .25
4.60 – .50
41.28 – .50
6.73 – .25
8.00 – 1.02
0.38 max
P
G
F
[1]
U
.015 max
0.38 max
E
D
-X-
Figure 8.
LW mounting configuration dimensions
Barracuda 36ES2 Product Manual, Rev. B
31
S
T -Z-
[1]
-Z-
L
J
H
B
Notes:
[1] Mounting holes are 6-32 UNC 2B, three
on each side and four on the bottom.
Max screw penetration into side of drive
is 0.15 in. (3.81 mm). Max screw
tightening torque is 6.0 in-lb (3.32 nm)
with minimum full thread engagement of
A
0.12 in. (3.05 mm).
R
-Z-
C
Dimension Table
U -X-
Inches
Millimeters
A
B
C
D
E
F
H
J
K
L
P
R
S
T
U
1.028 max
5.787 max
4.000 – .010
3.750 – .010
.125 – .010
1.750 – .010
1.122 – .020
4.000 – .010
.250 – .010
1.638 – .010
1.625 – .020
.265 – .010
.335 – .010
.015 max
26.10 max
147.00 max
101.60 – .25
95.25 – .25
3.18 – .25
44.45 – .25
28.50 – .50
101.60 – .25
6.35 – .25
41.60 – .25
41.28 – .50
6.73 – .25
8.50 – .25
0.38 max
P
F
[1]
.015 max
0.38 max
E
D
-X-
Figure 9.
N mounting configuration dimensions
32
Barracuda 36ES2 Product Manual, Rev. B
Barracuda 36ES2 Product Manual, Rev. B
33
7.0
Defect and error management
The drive, as delivered, complies with this specification. The read error rate and specified storage capacity are
not dependent upon use of defect management routines by the host (initiator).
Defect and error management in the SCSI system involves the drive internal defect/error management and
SCSI systems error considerations (errors in communications between Initiator and the drive). Tools for use in
designing a defect/error management plan are briefly outlined in this section, with references to other sections
where further details are given.
7.1
Drive internal defects
During the initial drive format operation at the factory, media defects are identified, tagged as being unusable,
and their locations recorded on the drive primary defects list (referred to as the “P” list and also as the ETF
defect list). At factory format time, these known defects are also reallocated, that is, reassigned to a new place
on the medium and the location listed in the defects reallocation table. The “P” list is not altered after factory
formatting. Locations of defects found and reallocated during error recovery procedures after drive shipment
are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator using the
Read Defect Data command (see the SCSI Interface Product Manual, part number 75789509).
7.2
Drive error recovery procedures
Whenever an error occurs during drive operation, the drive, if programmed to do so, performs error recovery
procedures to attempt to recover the data. The error recovery procedures used depend on the options previ-
ously set up in the error recovery parameters mode page. Error recovery and defect management may involve
the use of several SCSI commands, the details of which are described in the SCSI Interface Product Manual.
The drive implements selectable error recovery time limits such as are required in video applications. For addi-
tional information on this, refer to the Error Recovery Page table in the SCSI Interface Product Manual, which
describes the Mode Select/Mode Sense Error Recovery parameters.
The error recovery scheme supported by the drive provides a means to control the total error recovery time for
the entire command in addition to controlling the recovery level for a single LBA. The total amount of time spent
in error recovery for a command can be limited via the Recovery Time Limit bytes in the Error Recovery Mode
Page. The total amount of time spent in error recovery for a single LBA can be limited via the Read Retry
Count or Write Retry Count bytes in the Error Recovery Mode Page.
The drive firmware error recovery algorithms consist of 11 levels for read recoveries and 15 levels for writes.
Table 3 equates the Read and Write Retry Count with the maximum possible recovery time for read and write
recovery of individual LBAs. The times given do not include time taken to perform reallocations, if reallocations
are performed. Reallocations are performed when the ARRE bit (for reads) or AWRE bit (for writes) is one, the
RC bit is zero, and the Recovery Time Limit for the command has not yet been met. Time needed to perform
reallocation is not counted against the Recovery Time Limit.
The Read Continuous (RC) bit, when set to one, requests the disc drive to transfer the requested data length
without adding delays (for retries or ECC correction) that may be required to insure data integrity. The disc
drive may send erroneous data in order to maintain the continuous flow of data. The RC bit should only be
used when data integrity is not a concern and speed is of utmost importance. If the Recovery Time Limit or
retry count is reached during error recovery, the state of the RC bit is examined. If the RC bit is set, the drive
will transfer the unrecovered data with no error indication and continue to execute the remaining command. If
the RC bit is not set, the drive will stop data transfer with the last good LBA, and report a “Check Condition,
Unrecovered Read Error.”
34
Barracuda 36ES2 Product Manual, Rev. B
LBA (cumulative, msec)
Table 3:
Read and write retry count maximum recovery times [1]
Read retry
Maximum recovery time per
LBA (cumulative, msec)
Write retry Maximum recovery time per
count
0
108.29
124.95
424.83
458.15
516.46
583.10
741.37
857.99
891.31
966.28
1049.58
2782.22
0
91.63
116.62
141.61
166.60
224.91
283.22
449.82
474.81
516.46
541.45
2640.61
2665.60
2690.59
2715.58
2773.89
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
12
13
14
11 (default)
15 (default) 2832.20
[1] These values are subject to change.
Setting these retry counts to a value below the default setting could result in an increased unrecovered
error rate which may exceed the value given in this product manual. A setting of zero (0) will result in the
drive not performing error recovery.
For example, suppose the Read/Write Recovery page has the RC bit set to 0, read retry count set to 4,
and the recovery time limit field (Mode Sense page 01, bytes 10 and 11) set to FF FF hex (maximum). A
four LBA Read command is allowed to take up to 516.46 msec recovery time for each of the four LBAs in
the command. If the recovery time limit is set to 00 C8 hex (200 msec decimal) a four LBA read command
is allowed to take up to 200 msec for all error recovery within that command. The use of the Recovery
Time Limit field allows finer granularity on control of the time spent in error recovery. The recovery time
limit only starts counting when the drive is executing error recovery and it restarts on each command.
Therefore, each command’s total recovery time is subject to the recovery time limit. Note: A recovery time
limit of 0 will use the drive’s default value of FF FF. Minimum recovery time limit is achieved by setting the
Recovery Time Limit field to 00 01.
7.3
SCSI systems errors
Information on the reporting of operational errors or faults across the interface is given in the SCSI Interface
Product Manual, part number 75789509. Message Protocol System is described in the SCSI Interface Product
Manual. Several of the messages are used in the SCSI systems error management system. The Request
Sense command returns information to the host about numerous kinds of errors or faults. The Receive Diag-
nostic Results reports the results of diagnostic operations performed by the drive.
Status returned by the drive to the Initiator is described in the SCSI Interface Product Manual. Status reporting
plays a role in the SCSI systems error management and its use in that respect is described in sections where
the various commands are discussed.
Barracuda 36ES2 Product Manual, Rev. B
35
8.0
Installation
Note. These drives are designed to be used only on single-ended (SE) or low voltage differential (LVD) bus-
ses. Do not install these drives on a high voltage differential (HVD) bus.
The first thing to do when installing a drive is to set the drive SCSI ID and set up certain operating options. This
is usually done by installing small shorting jumpers on the pins of connectors J2 and J6 on the PCBA (or J1-
Auxiliary on the LW model). Some users connect cables to J6 or J5-Auxiliary and perform the set-up using
remote switches.
Configure drive options
For option jumper locations and definitions refer to Figures 10, 12, and 13. Drive default mode parameters are
not normally needed for installation. Refer to Section 9.3.2 for default mode parameters if they are needed.
• Ensure that the SCSI ID of the drive is not the same as the host adapter. Most host adapters use SCSI ID 7
because ID 7 is the highest priority on both 8 and 16 bit data buses.
• If multiple devices are on the bus set the drive SCSI ID to one that is not presently used by other devices on
the bus.
• If the drive is the only device on the bus, attach it to the end of the SCSI bus cable. The user, system integra-
tor, or host equipment manufacturer must provide external terminators.
• Set all appropriate option jumpers for desired operation prior to power on. If jumpers are changed after
power has been applied, recycle the drive power to make the new settings effective.
• Installation instructions are provided by host system documentation or with any additionally purchased drive
installation software. If necessary see Section 10 for Seagate support services telephone numbers.
• Do not remove the manufacturer’s installed labels from the drive and do not cover with additional labels, as
the manufacturer labels contain information required when servicing the product.
Formatting
• It is not necessary to low level format this drive. The drive is shipped from the factory low level formatted in
512 byte sectors.
• Reformat the drive if a different spare sector allocation scheme is selected.
• High level formatting the drive involves assigning one or more partitions or logical drives to the drive volume.
Follow the instructions in the system manuals for the system into which the drive is to be installed.
8.1
Drive ID/option select header
Figures 10 through 12 show views of the drive ID select jumper connectors. Figures 13 and 14 show the J2
option select jumper connectors for all models. Figure 12 shows the drive’s J5-Auxiliary jumper connector. Both
J5-Auxiliary and J6 have pins for selecting drive ID and for connecting the remote LED cable. Only one or the
other should be used, although using both at the same time would not damage the drive. The notes following
the figures describe the functions of the various jumper positions on the connectors J2, J5-Auxiliary and J6.
Suggested part number for the jumpers used on J2 is Molex 52747-0211 (Seagate part number 77679052). A
bag with the two jumper plug types is shipped with the standard OEM drives.
36
Barracuda 36ES2 Product Manual, Rev. B
Drive
Front
Jumper Plug
(enlarged to
show detail)
Pin 1
[1] [5]
J6
L
E
D
R
E
S
Reserved
A
A A A
1 0
3
2
SCSI ID = 0
(default)
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
[2]
Shipped with cover installed.
[5]
Reserved
Pins
Do not install jumpers;
Host
[4]
retain cover.
11
9
7
5
3
1
Alternate
Usage Plug:
8
6
4
2
+5V
Ground
[6]
Drive Activity LED
Dashed area is optional host circuitry (external to the drive)
connected to host supplied optional usage plug.
[4]
[5] Do not connect anything to pins 13-20.
Figure 10. J6 jumper header for LW models
Barracuda 36ES2 Product Manual, Rev. B
37
Drive
Front
Jumper Plug
(enlarged to
show detail)
Pin 1
[1][5]
J6
L R R
E E E
D S S
Reserved
A
A
A
0
2
1
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
(default)
Shipped with cover installed.
[3]
[5]
Reserved
Pins
Do not install jumpers;
Host
[4]
retain cover.
11
9
7
5
3
1
Alternate
Usage Plug:
6
4
2
+5V
Ground
[6]
Drive Activity LED
Dashed area is optional host circuitry (external to the drive)
connected to host supplied optional usage plug.
[4]
[5] Do not connect anything to pins 13-20.
Figure 11. J6 jumper header for N model
38
Barracuda 36ES2 Product Manual, Rev. B
Drive HDA (rear view, PCB facing downward)
J5
Pin 1
[1] [2]
Pin 1
+5V Ground
4P
3P 2P
1P
[2]
(default)
J1-DC Power
68 Pin
SCSI I/O Connector
J1
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
PCB
SCSI ID = 6
SCSI ID = 7
For ID selection use
jumpers as shown or
connect a cable for
remote switching as
shown below.
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
A
A
A
A
3
2
1
0
Pins 1, 3, 5, and 7 are
optional connections to
switching circuits in host
equipment to establish
drive ID.
Reserved
Host [4]
Alternate
N.C.
11
9
7
5
6
3
4
1
2
Usage Plug
A
A
A
A
3
0
1
2
Remote Switches
Pins 2, 4, 6, and 8 are
normally not grounded.
They are driven low (ground)
for 250 ms after a Reset
or PWR ON to allow drive to
read SCSI ID selected.
12 10 8
+5V
N.C.
Ground
+5V
[6]
Drive Activity LED
[4]
Dashed area is optional host circuitry (external to the
drive) connected to host supplied optional usage plug.
Figure 12. J5 jumper header (on LW models only)
Barracuda 36ES2 Product Manual, Rev. B
39
J2
Pin 1
R R T
S D MW P E E P
E S E P D S S 1
Jumper
Positions
Force single-ended bus mode
Delay Motor Start
Enable Remote Motor Start
Write Protect
Parity Disable
Reserved
*Additional notes on these
functions in section 8.1.2.
[3]
(applies to ’LW’ model only)
Term. Power to SCSI Bus
J6
J2
J2
Jumper Plug
(enlarged to
show detail)
Figure 13. J2 option select header (for LW models)
J2
Pin 1
R T T
T D MW P E P P
E S E P D S 2 1
Jumper
Positions
[1]
Terminator Enable
Delay Motor Start
Enable Motor Start
Write Protect
Parity Disable
Term. Power from Drive
Term. Power to SCSI Bus
Term. Power from SCSI Bus
[3]
*Additional notes on these
functions in section 8.1.2.
J2
Jumper Plug
(enlarged to
show detail)
J6
J2
Figure 14. J2 option select header (for N models)
40
Barracuda 36ES2 Product Manual, Rev. B
8.1.1
Notes for Figures 14 through 18
[1] Notes explaining the functions of the various jumpers on jumper header connectors J2, J5, and J6 are
given here and in Section 8.1.2. The term “default” means as standard OEM units are configured with a
jumper on those positions when shipped from factory. “Off” means no jumper is installed; “On” means a
jumper is installed. OFF or ON underlined is factory default condition.
The PCBA on LC models does not have connector J5. The J5 connector signals conform to SFF-8009
Revision 2.0, Unitized Connector for Cabled Drives, signal assignments for auxiliary connectors.
[3] Voltage supplied by the drive.
[4] Dashed area is optional host circuitry (external to the drive) connected to host supplied optional usage
plug.
[5] Do not connect anything to J5 pins 9 and 12 or J6 pins 13-20.
[6] Connect an external Drive Activity LED to J6 pins 11 and 12 (see figures 10 and 11), or to J5 pin 8 (see
Figure 12) and the drives +5V power source, through an appropriately sized current limiting resistor. The
drive provides an internal 150 ohm current limiting resistor for the J6 connection.
Barracuda 36ES2 Product Manual, Rev. B
41
8.1.2
Function description
J2
jumper
installation
Jumper function description
TE (Applies only to the N models)
On
With the jumper installed, the onboard (non-removable) terminator circuits are enabled (con-
nected to the I/O lines).
Off
Terminator circuits not enabled (not connected to I/O lines). Default is jumper installed.
SE (Applies only to the LW model)
On
Off
Forces drive to use single-ended I/O drivers/receivers only.
Drive can operate on the interface in low voltage differential mode or single-ended,
depending on the voltage state of the I/O “DIFFSNS” line. Default is SE jumper not installed.
DS
Off
Off
On
ME
Off
On
Off
Spindle starts immediately after power up—Default setting.
Drive spindle does not start until Start Unit command received from host.
Spindle Startup is delayed by SCSI ID times12 seconds after power is applied, i.e., drive 0
spindle starts immediately when DC power connected, drive 1 starts after 12 second delay,
drive 2 starts after 24 second delay, etc.
On
On
Drive spindle starts when Start Unit command received from host. Delayed start feature is
overridden and does not apply when ME jumper is installed.
WP
On
Off
Entire drive is write protected.
Drive is not write protected. Default is WP jumper not installed.
PD
On
Off
Parity checking and parity error reporting by the drive is disabled.
Drive checks for parity and reports result of parity checking to host.
Default is PD jumper not installed.
TP1 (Applies only to the LW and N models)
Off
On
TP2 (Applies only to the N models)
On
Off
No power is connected to the drives internal terminators. Default is jumper installed.
42
Barracuda 36ES2 Product Manual, Rev. B
8.1.3
Drive orientation
The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive perfor-
mance characterization, however, has been done with the drive in horizontal (discs level) and vertical (drive on
its side) orientations, and these are the two preferred mounting orientations.
8.2
Cooling
Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding
the drive will not exceed temperature conditions specified in Section 6.4.1, “Temperature.” Specific consider-
ation should be given to make sure adequate air circulation is present around the printed circuit board (PCB) to
8.2.1
Air flow
The rack, cabinet, or drawer environment for the drive must provide heat removal from the electronics and
head and disc assembly (HDA). You should confirm that adequate heat removal is provided using the temper-
Forced air flow may be required to keep temperatures at or below the specified case temperatures, in which
case the drive should be oriented, or air flow directed, so that the least amount of air flow resistance is created
while providing air flow to the electronics and HDA. Also, the shortest possible path between the air inlet and
exit should be chosen to minimize the travel length of air heated by the drive and other heat sources within the
rack, cabinet, or drawer environment.
If forced air is determined to be necessary, possible air-flow patterns are shown in Figure 15. The air-flow pat-
terns are created by one or more fans, either forcing or drawing air as shown in the illustrations. Conduction,
convection, or other forced air-flow patterns are acceptable as long as the temperature measurement guide-
Above unit
Under unit
Note. Air flows in the direction shown (back to front)
or in reverse direction (front to back)
Above unit
Under unit
Note. Air flows in the direction shown or
in reverse direction (side to side)
Figure 15. Air flow (suggested)
Barracuda 36ES2 Product Manual, Rev. B
8.3 Drive mounting
43
When mounting the drive using the bottom holes (x-y plane in Figure 7) care must be taken to ensure that the
drive is not physically distorted due to a stiff non-flat mounting surface. The allowable mounting surface stiff-
ness is 80 lb/in (14.0 N/mm). The following equation and paragraph define the allowable mounting surface stiff-
ness:
k * x = F < 15lb = 67N
where ‘k’ represents the mounting surface stiffness (units of lb/in or N/mm), and ‘x’ represents the out-of-plane
mounting surface distortion (units of inches or millimeters). The out-of-plane distortion (‘x’) is determined by
defining a plane with three of the four mounting points fixed and evaluating the out-of-plane deflection of the
fourth mounting point when a known force (F) is applied to the fourth point.
Note. Before mounting the drive in any kind of 3.5-inch to 5.25-inch adapter frame, verify with Seagate Tech-
nology that the drive can meet the shock and vibration specifications given herein while mounted in
such an adapter frame. Adapter frames that are available may not have a mechanical structure capa-
ble of mounting the drive so that it can meet the shock and vibration specifications listed in this man-
ual.
8.4
Grounding
Signal ground (PCBA) and HDA ground are connected together in the drive and cannot be separated by the
user. The equipment in which the drive is mounted is connected directly to the HDA and PCBA with no electri-
cally isolating shock mounts. If it is desired for the system chassis to not be connected to the HDA/PCBA
ground, the systems integrator or user must provide a nonconductive (electrically isolating) method of mount-
ing the drive in the host equipment.
Increased radiated emissions may result if you do not provide the maximum surface area ground connection
between system ground and drive ground. This is the system designer’s and integrator’s responsibility.
44
Barracuda 36ES2 Product Manual, Rev. B
Barracuda 36ES2 Product Manual, Rev. B
45
9.0
Interface requirements
This section partially describes the interface requirements as implemented on the drives.
9.1 General description
This section describes in essentially general terms the interface requirements supported by the Barracuda
36ES2. No attempt is made to describe all of the minute details of conditions and constraints that must be con-
sidered by designers when designing a system in which this family of drives can properly operate. Seagate
declares that the drives operate in accordance with the appropriate ANSI Standards referenced in various
places herein, with exceptions as noted herein or in the Seagate SCSI Interface Product Manual, part number
75789509.
9.2
Table 4 lists the messages supported by the SCSI-2 and SCSI-3 modes of the Barracuda 36ES2 family drives.
Table 4: SCSI messages supported by Barracuda 36ES2 family drives
SCSI interface messages supported
Supported by
SCSI-2/3
Message name
Message code
Abort
06h
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
N
Y
Y
Abort-tag
0Dh
0Ch
16h
Bus device reset
Clear ACA
Clear queue
0Eh
00h
Command complete
Continue I/O process
Disconnect
12h
04h
Extended messages
Identify
01h[1]
80h-FFh
23h
Ignore wide residue (two bytes)
Initiate recovery
0Fh
05h
Initiator detected error
Linked command complete
Linked command complete with flag
Message parity error
Message reject
0Ah
0Bh
09h
07h
Modify data pointer
No operation
08h
Parallel Protocol Request
Queue tag messages (two bytes)
ACA
[1] [2]
24h
21h
22h
20h
10h
03h
02h
N
Y
Y
Y
N
Y
Y
Y
Y
N
Y
Head of queue tag
Ordered queue tag
Simple queue tag
Release recovery
Restore pointers
Save data pointer
Synchronous data transfer req.
Target transfer disable
Terminate I/O process
Wide data transfer request
13h
11h
46
Barracuda 36ES2 Product Manual, Rev. B
Notes.
[1] Extended messages (see the SCSI Interface Product Manual, part number 75789509).
[2] Supports all options except qas_req and iu_req.
9.3
SCSI interface commands supported
Table 5 following lists the SCSI interface commands that are supported by the drive. OEM standard drives are
shipped set to operate in Ultra160 mode.
Table 5:
Commands supported by Barracuda 36ES2 family drives
Command
code
Supported by
SCSI-2/3
Command name
Change definition
Compare
Copy
Copy and verify
Format unit [1]
Block Format
Bytes from index
Physical sector format
DPRY bit supported
DCRT bit supported
STPF bit supported
IP bit supported
40h
39h
18h
3Ah
04h
N
N
N
N
Y
N
Y
Y
N
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
N
Y
Y
N
N
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
DSP bit supported
IMMED bit supported
VS (vendor specific)
Inquiry (see Table 7 for Inquiry data)
Date code page (C1h)
Device Behavior page (C3h)
Firmware numbers page (C0h)
Implemented operating def page (81h)
Jumper settings page (C2h)
Supported Vital product data page (00h)
Unit serial number page (80h)
Lock-unlock cache
Log select
DU bit
DS bit
TSD bit
ETC bit
TMC bit
LP bit
Log sense
Cache statistics page (37h)
Non-medium error page (06h)
Pages supported list (00h)
Power-on time page (3Eh)
Read error counter page (03h)
Drive self-test page (10h)
S.M.A.R.T. attribute log page (30h)
Verify error counter page (05h)
12h
36h
4Ch
4Dh
Barracuda 36ES2 Product Manual, Rev. B
47
Table 5:
Commands supported by Barracuda 36ES2 family drives (Continued)
Command
code
Supported by
SCSI-2/3
Command name
Write error counter page (02h)
Mode select (same pages as Mode Sense 1Ah)
Mode select (10) (same pages as Mode Sense 1Ah)
Capacity Programming
Mode sense
Caching parameters page (08h)
Control mode page (0Ah)
Disconnect/reconnect (02h) (DTDC, DIMM not used)
Error recovery page (01h)
Format page (03h)
Y
Y [2]
Y
Y
Y
Y
Y
Y
Y
15h
55h
1Ah
Information exceptions control page (1Ch)
Notch and Partition Page (0Ch)
Power condition page (1Ah)
Rigid disc drive geometry page (04h)
Unit attention page (00h)
Verify error recovery page (07h)
Xor Control page (10h)
Mode sense (10) (same pages as Mode Sense 1Ah)
Prefetch
Y
N
Y
Y
Y
Y
N
Y
N
Y
Y
5Ah
34h
08h
3Ch
25h
37h
B7h
28h
Read
Read buffer (modes 0, 2, 3, Ah and Bh supported)
Read capacity
Read defect data (10)
Read defect data (12)
Read extended
Y
Y
Y
Y
DPO bit supported
Y
FUA bit supported
Y
Read long
Reassign blocks
Rebuild
Receive diagnostic results
Supported diagnostics pages (00h)
Translate page (40h)
3Eh
07h
81h
1Ch
Y
Y
N
Y
Y
Y
Regenerate
Release
Release (10)
Request sense
82h
17h
57h
03h
N
Y
Y
Y
Actual retry count bytes
Deferred error supported
Extended sense
Y
Y
N
Y
Field pointer bytes
Reserve
3rd party reserve
Extent reservation
Reserve (10)
16h
56h
Y
Y
N
Y
3rd part reserve
Y
Extent reservation
N
48
Barracuda 36ES2 Product Manual, Rev. B
Commands supported by Barracuda 36ES2 family drives (Continued)
Table 5:
Command
code
Supported by
SCSI-2/3
Command name
Rezero unit
01h
31h
30h
32h
0Bh
2Bh
1Dh
Y
N
N
N
Y
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Search data equal
Search data high
Search data low
Seek
Seek extended
Send diagnostics
Supported diagnostics pages (00h)
Translate page (40h)
DST (logical unit self-test diagnostics)
Set limits
Start unit/stop unit (spindle ceases rotating) (1Ch)
Synchronize cache
Test unit ready
Verify
DPO bit supported
BYTCHK bit
Write
Write and verify
DPO bit
BYTCHK bit
Write buffer (modes 0, 2, supported)
Firmware download option
33h
1Bh
35h
00h
2Fh
0Ah
2Eh
3Bh
2Ah
(modes 5, 7, Ah and Bh supported) [3]
Write extended
DPO bit
Y
Y
Y
Y
Y
N
N
N
N
N
N
FUA bit
Write long
Write same
PBdata
LBdata
XDRead
XDWrite
XDWrite extended
XPWrite
3Fh
41h
52h
50h
80h
51h
[1] The drive can format to any even number of bytes per sector from 512 to 4,096.
[3] WARNING: A power loss during flash programming can result in firmware corruption. This usually makes
the drive inoperable.
Barracuda 36ES2 Product Manual, Rev. B
49
Table 6 lists the Standard Inquiry command data that the drive should return to the initiator per the format given
in the SCSI Interface Product Manual, part number 75789509, Inquiry command section.
Table 6:
Barracuda 36ES2 family drive Standard Inquiry data
Bytes
Data (HEX)
0-15
00 00 [03]1 [12]2 8B 00 [01] [3E] 53
53 54 [33] [33] [36] [39] [33] [38] [4C] [57]3 20 20 20 20 20 20 PRODUCT ID
45
41 47 41 54 45 20 VENDOR ID
16-31
32-47
48-63
64-79
80-95
96-111
R# R# R#
00 00 00
00 00 00
00 00 00
00 43 6F
R# S# S# S# S#
00 00 00 00 00
00 00 00 00 00
00 00 00 00 00
70 79 72 69 67
S# S# S# S# 00 00 00 00
0C 00
00 00 00 00 00 00
00
00
68
61
65
00
00
74
74
73
00 00 00 00 00 00
00 00 00 00 00 00
20 28 63 29 20 [32] COPYRIGHT
65 20 41 6C 6C 20 NOTICE
65 72 76 65 64 20
112-127 [30] [30] [30]5 20 53 65 61 67
128-143 72 69 67 68 74 73 20 72
[ ]1 03 means SCSI-3 (Ultra160) implemented.
[ ]2 02 means response data in SCSI-3 (Ultra160) format. In addition, 12 indicates that the drive uses the hier-
archical addressing mode to assign LUNs to logical units (default is 12).
R# Four ASCII digits representing the last four digits of the product Firmware Release number. This informa-
tion is also given in the Vital Product Data page C0h, together with servo RAM and ROM release num-
bers.
S# Eight ASCII digits representing the eight digits of the product serial number.
[ ]3 Bytes 18 through 25 reflect model of drive. The table above shows hex values for Model ST336938LW.
Values for all models are listed below:
ST336918N
ST318418N
ST318438LW
33 33 36 39 31 38 4E 20
33 31 38 34 31 38 4E 20
33 31 38 34 33 38 4C 57
[ ]5 Copyright Year - changes with actual year.
50
Barracuda 36ES2 Product Manual, Rev. B
9.3.1
Inquiry Vital Product data
Instead of the standard Inquiry data shown in Table 6, the initiator can request several Vital Product Data
pages by setting the Inquiry command EVPD bit to one. The SCSI Interface Product Manual, part number
75789509, lists the Vital Product Data pages and describes their formats. A separate Inquiry command must
be sent to the drive for each Vital Product Data page the initiator wants the drive to send back.
Table 7 shows the Vital Product Data pages for the drives of this product manual. “Y” means reporting that par-
ticular parameter is supported, but it may be different for each drive.
Table 7:
Vital product data pages
Byte Page
Supported
Unit serial number page 80h
0
1
2
3
Peripheral qualifier/peripheral device type
Page code number
Reserved
—
80
00
14
Y
Page length
4-23 Product serial number
Implemented operating definition page 81h
0
1
2
3
4
5
6
Peripheral qualifier/peripheral device type
Page code number
—
81
00
03
Y
Reserved
Page length
SAVIMP=0, current operating definition
SAVIMP=0, default operating definition
SAVIMP=0, supported operating definition
Y
Y
Firmware numbers page C0h
0
1
2
3
Peripheral qualifier/peripheral device type
Page code number
Reserved
—
C0
00
38
Y
Page length
4-11 SCSI firmware release number
12-19 Servo firmware release number
20-27 SAP block point numbers (major/minor)
28-31 Servo firmware release date
32-35 Servo firmware release year
36-43 SAP firmware release number
44-47 SAP firmware release date
48-51 SAP firmware release year
52-55 SAP manufacturing key
Y
Y
Y
Y
Y
Y
Y
Y
56-59 Servo firmware product families and product family member IDs Y
Data code page C1h
0
1
2
3
Peripheral qualifier/peripheral device type
Page code number
Reserved
Y
C1
00
10
Y
Page length
4-11 Manufacture (ETF) date—MMDDYYYY
12-19 SCSI firmware release date—MMDDYYYY
Y
Barracuda 36ES2 Product Manual, Rev. B
51
Table 7:
Vital product data pages (Continued)
Byte Page
Supported
Jumper settings page C2h
0
1
2
3
4
Peripheral qualifier/peripheral device type
Y
Page code number
Reserved
C2
00
02
Y
Page length
SCSI ID, delayed motor start, motor start, write protect, parity
enable
5
Terminator enable
[1]
[1] “N” models support Terminator Enable.
Vital Product data pages C3h, D1h, and D2h are supported vendor-specific pages. Descriptions of their usage
are not available at this time.
52
Barracuda 36ES2 Product Manual, Rev. B
9.3.2
Mode Sense data
The Mode Sense command provides a means for the drive to report its operating parameters to the initiator.
The drive maintains four sets of Mode parameters, Default values, Saved values, Current values and Change-
able values.
Default values are hard coded in the drive firmware that is stored in flash EPROM nonvolatile memory on the
drive PCBA. Default values can be changed only by downloading a complete set of new firmware into the flash
EPROM. An initiator can request and receive from the drive a list of default values and use those in a Mode
Select command to set up new current and saved values, where the values are changeable.
Saved values are stored on the disk media using a Mode Select command. Only parameter values that are
allowed to be changed can be changed by this method. See “Changeable values” defined below. Parameters
in the saved values list that are not changeable by the Mode Select command get their values from the default
values storage.
Current values are volatile values currently being used by the drive to control its operation. A Mode Select
command can be used to change these values (only those that are changeable). Originally, they are installed
from saved or default values after a power on reset, hard reset, or Bus Device Reset message.
Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the current values and
saved values can be changed by a Mode Select command. A “one” allows a change to a corresponding bit; a
“zero” allows no change. For example, in Table 8 refer to Mode page 01, in the row entitled “CHG”. These are
hex numbers representing the changeable values for mode page 01. Note that bytes 04, 05, 06, and 07 are not
changeable, because those fields are all zeros. If some changeable code had a hex value EF, that equates to
the binary pattern 1110 1111. If there is a zero in any bit position in the field, it means that bit is not changeable.
Bits 7, 6, 5, 3, 2, 1, and 0 are changeable, because those bits are all ones. Bit 4 is not changeable.
Though the drive always reports non-zero values in bytes 00 and 01, those particular bytes are never change-
able.
The Changeable values list can only be changed by downloading new firmware into the flash EPROM.
On standard OEM drives the Saved values are taken from the default values list and stored into the saved val-
ues storage location on the media prior to shipping.
When a drive is powered up, it takes saved values from the media and stores them to the current values stor-
age in volatile memory. It is not possible to change the current values (or the saved values) with a Mode Select
command before the drive is up to speed and is “ready.” An attempt to do so results in a “Check Condition sta-
tus being returned.
Note. Because there may be several different versions of drive control firmware in the total population of
drives in the field, the Mode Sense values given in the following tables may not exactly match those of
some drives.
Barracuda 36ES2 Product Manual, Rev. B
53
The following tables list the values of the data bytes returned by the drive in response to the Mode Sense com-
mand pages for SCSI-2/SCSI-3 implementation (see the SCSI Interface Product Manual, part number
75789509).
Definitions:
DEF = Default value. Standard drives are shipped configured this way.
CHG= Changeable bits; indicates if current and saved values are changeable.
Note. Saved values for OEM drives are normally the same as the default values.
Table 8:
Bytes
Mode sense data, ST336938 and ST336918 values (SCSI-2/3 implementation)
00 01 02 03 04 05 06 07 08 09 10 11 12
13 14 15 16 17 18 19 20 21 22 23
Mode
Sense
Data
00 a2 00 10 00 00 00 08 04 4d 53 b6 00
00 02 00
Mode
Page
<-----------------------------Mode Page 10 Byte Header Data and Parameter Data Bytes--------------------------->
01 DEF 81 0a c0 0b f0 00 00 00 0f 00 ff
01 CHG 81 0a ff ff 00 00 00 00 ff 00 ff
ff
ff
02 DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00
02 CHG 82 0e ff ff 00 00 00 00 00 00 00 00 87
00 00 00
00 00 00
03 DEF 83 16 1b 1e 00 00 00 88 00 00 02 84 02
03 CHG 83 16 00 00 00 00 00 00 00 00 00 00 00
00 00 01 00 63 00 54 40 00 00 00
00 00 00 00 00 00 00 00 00 00 00
04 DEF 84 16 00 dc 0c 02 00 00 00 00 00 00 00
04 CHG 84 16 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 1c 20 00 00
00 00 00 00 00 00 00 00 00 00 00
07 DEF 87 0a 00 0b f0 00 00 00 00 00 ff
ff
ff
07 CHG 87 0a 0f ff
00 00 00 00 00 00 ff
08 DEF 88 12 14 00 ff
ff
00 00 ff
ff ff
ff
ff
ff
ff
00
10 00 00 00 00 00 00
08 CHG 88 12 b5 00 00 00 ff
00 00 00 00 00 00
0A DEF 8a 0a 02 00 00 00 00 00 00 00 05 ef
0A CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00
1A DEF 9a 0a 00 03 00 00 00 01 00 00 00 04
1A CHG 9a 0a 00 03 00 00 00 00 00 00 00 00
1C DEF 9c 0a 00 00 00 00 00 00 00 00 00 01
1C CHG 9c 0a 8d 0f ff
ff
ff
ff
ff
ff
ff
ff
00 DEF 80 02 80 00 0f 00 00 00
00 CHG 80 02 f7 40 0f 00 00 00
Read capacity data
04 4d 53 b5 00 00 02 00
[1] Though byte 12, bit 7 (A0) is shown as changeable, the FSW function governed by that bit is not imple-
mented by this drive.
54
Barracuda 36ES2 Product Manual, Rev. B
Mode sense data, ST318438 and ST318418 values (SCSI-2/3 implementation)
Table 9:
Bytes
00 01 02 03 04 05 06 07 08 09 10 11 12
13 14 15 16 17 18 19 20 21 22 23
Mode
Sense
Data
00 a2 00 10 00 00 00 08 02 51 c8 01 00
00 02 00
Mode
Page
<-----------------------------Mode Page 10 Byte Header Data and Parameter Data Bytes--------------------------->
01 DEF 81 0a c0 0b f0 00 00 00 0f 00 ff
01 CHG 81 0a ff ff 00 00 00 00 ff 00 ff
ff
ff
02 DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00
02 CHG 82 0e ff ff 00 00 00 00 00 00 00 00 87
00 00 00
00 00 00
03 DEF 83 16 1b 1e 00 00 00 88 00 00 02 84 02
03 CHG 83 16 00 00 00 00 00 00 00 00 00 00 00
00 00 01 00 63 00 54 40 00 00 00
00 00 00 00 00 00 00 00 00 00 00
04 DEF 84 16 00 67 42 02 00 00 00 00 00 00 00
04 CHG 84 16 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 1c 20 00 00
00 00 00 00 00 00 00 00 00 00 00
07 DEF 87 0a 00 0b f0 00 00 00 00 00 ff
ff
ff
07 CHG 87 0a 0f ff
00 00 00 00 00 00 ff
08 DEF 88 12 14 00 ff
ff
00 00 ff
ff ff
ff
ff
ff
ff
00
10 00 00 00 00 00 00
08 CHG 88 12 b5 00 00 00 ff
00 00 00 00 00 00
0A DEF 8a 0a 02 00 00 00 00 00 00 00 01 8d
0A CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00
1A DEF 9a 0a 00 03 00 00 00 01 00 00 00 04
1A CHG 9a 0a 00 03 00 00 00 00 00 00 00 00
1C DEF 9c 0a 00 00 00 00 00 00 00 00 00 01
1C CHG 9c 0a 8d 0f ff
ff
ff
ff
ff
ff
ff
ff
00 DEF 80 02 80 00 0f 00 00 00
00 CHG 80 02 f7 40 0f 00 00 00
Read capacity data
02 51 c8 00 00 00 02 00
[1] Though byte 12, bit 7 (A0) is shown as changeable, the FSW function governed by that bit is not imple-
mented by this drive.
Barracuda 36ES2 Product Manual, Rev. B
9.4 SCSI bus conditions and miscellaneous features supported
55
Asynchronous SCSI bus conditions supported by the drive are listed below. These conditions cause the SCSI
device to perform certain actions and can alter the SCSI bus phase sequence. Other miscellaneous operating
features supported are also listed here. Refer to the SCSI Interface Product Manual, part number 75789509,
for details.
Table 10:
SCSI bus conditions and other miscellaneous features
Condition/features supported:
Supported
Conditions or feature
Y
Y
N
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
N
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
50 and 68 pin interface connectors
1 Mbyte data buffer
Active termination disabled via jumper
Terminator power from drive power connector and to SCSI bus option
Terminator power from drive power connector option
Terminator power from SCSI bus pin 26 option
Terminator power from SCSI I/O cable pin 26
Active termination enabled (N models only)
Adaptive caching
Adaptive read look-ahead
Arbitrating system
ASYNC burst rate of 5 Mbytes/sec.—single-ended
Asynchronous data transfer
Asynchronous event notification
Attention condition
Audio video recovery scheme
Automatic adaptive cache (customer unique option)
Capacity programming
Command overhead less than 500 USEC, typ.
Contingent allegiance condition
Deferred error handling
Delayed motor start
Disconnect/reconnect
Embedded servo
Firmware downloadable via SCSI interface
Flag and link bits in control byte supported
Format progress indication
Full automatic read and write reallocation
Hot plugging, with bus active
Immediate status on Format Unit command
Immediate status on Start/Stop command
Immediate status on Synchronize cache
Linked commands—customer unique options
Low voltage differential SCSI (LVD)
Motor start enable
Multi-initiator
Multi-mode drivers/receivers (single-ended/differential)
56
Barracuda 36ES2 Product Manual, Rev. B
Supported
Conditions or feature
Y
Parameter rounding
Y
Power management, SCSI-3
Y
Queue tagging (up to 64 Que tags supported)
Read look ahead crossing cylinder boundaries
Relative addressing—customer unique options
Y
N
Y
Reporting actual retry count in Extended Sense bytes 15, 16 and 17.
Reset condition
Y
Y
RPS (rotational position seek/sort)
S2 bit
Y
SCA-2
Y
SCA connector (optional)
SCSI ID accessibility to front end (J6)
SCSI-3 SPI compliant
Y
Y
Variable Sector size, 512 to 4,096 in 2 byte multiples
Segmented caching
Y
Y
S.M.A.R.T. (Self-Monitoring Analysis and Reporting Technology)
Sparing scheme per cylinder
N
N
N
Y
Sparing scheme per track
Sparing scheme per volume
Sparing scheme per zone
Y
Strict bit support
Y
Sustained transfer rate of 3 Mbytes/sec.—single-ended
Sync spindles—rotational position offset
Synchronized (locked) spindle operation
Synchronous data transfer
N
N
Y
Y
Tagged command queuing 64 deep
Target initiated SDTR
Y
N
Y
TTD/CIOP
Ultra SCSI, 20 Mbytes/sec.
Y
Ultra-2 SCSI, 40 Mbytes/sec.
Y
Ultra160 SCSI, 80 Mbytes/sec. (LVD, single transition only)
Ultra160 SCSI, 160 Mbytes/sec. (LVD, double transition only)
Write protected
Y
Y
N
Zero latency read
Supported
Status supported
Y
Y
Y
Y
Y
Y
Y
Y
N
Good
Check condition
Condition met/good
Busy
Intermediate/good
Intermediate/condition met/good
Reservation conflict
Queue full
Auto contingent allegiance active
Barracuda 36ES2 Product Manual, Rev. B
57
9.5
Synchronous data transfer
9.5.1
Synchronous data transfer periods supported
Table 11 and Section 9.5.2 list Synchronous Data transfer periods supported by the drive. The data transfer
period to be used by the drive and the initiator is established by an exchange of messages during the Message
Phase of operation. See the section on message protocol in the SCSI Interface Product Manual, part number
75789509.
Table 11:
Synchronous data transfer periods
Transfer period
(nanoseconds)
Transfer rate
(megatransfers/second)
M (decimal)
9
12.5
25
80.0 [1]
40.0 [1]
20.0
10
12
25
50
50
100
200
10.0
5.0
[1] This transfer rate is only allowed when using the LVD interface.
9.5.2
The maximum value supported by the Barracuda 36ES2 family drives for REQ/ACK offset is 63 (3Fh).
9.6 Physical interface
REQ/ACK offset
This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O
Figures 16 and 17 show the locations of the DC power connector, SCSI interface connector, drive select head-
ers, and option select headers.
Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI
operational aspects of Seagate drive interfaces are given in the SCSI Interface Product Manual, part number
75789509.
9.6.1
DC cable and connector
N and LW model drives receive DC power through a 4 pin connector (see Figures 22 and 23 for pin assign-
ments) mounted at the rear of the main PCBA. Recommended part numbers of the mating connector are listed
below, but equivalent parts may be used.
Type of cable
Connector
Contacts (20-14 AWG)
14 AWG
MP 1-480424-0
AMP 60619-4 (Loose Piece)
AMP 61117-4 (Strip)
60
Barracuda 36ES2 Product Manual, Rev. B
9.6.2
SCSI interface physical description
The drive models described by this product manual support the physical interface requirements of the Ultra160
SCSI Parallel Interface-3 (SPI-3) standards as defined in American National Standard document X3T10/1302D
revision 14, and operate compatibly at the interface with devices that support earlier SCSI-2 and SCSI-3 stan-
dards. It should be noted that this is only true if the systems engineering has been correctly done, and if earlier
SCSI-2 and SCSI-3 devices respond in an acceptable manner (per applicable SCSI Standards) to reject newer
Ultra160 SCSI protocol extensions that they don’t support.
The drives documented in this manual support single-ended and low voltage differential physical interconnects
(hereafter referred to as SE and LVD, respectively) as described in the ANSI SPI-3 standard. These drives
implement driver and receiver circuits that can operate either SE or LVD. However, they cannot switch dynam-
ically between SE and LVD operation.
The drives typically operate on a daisy-chain interface in which other SCSI devices are also operating. Devices
on the daisy chain must all operate in the same mode, either SE or LVD, but not a mixture of these. On the
interface daisy chain, all signals are common between all devices on the chain, or bus, as it is also called. This
daisy chain of SCSI devices must be terminated at both ends with the proper impedance in order to operate
correctly. Do not terminate intermediate SCSI devices. In some cases, the SCSI devices at each end have
onboard termination circuits that can be enabled by installation of a jumper plug (TE) on the device. These ter-
mination circuits receive power from either a source internal to the device, or from a line in the interface cable
specifically powered for that purpose. LW model drives do not have onboard termination circuits. Some type of
external termination circuits must be provided for these drives by the end user or designers of the equipment
into which the drives will be integrated. See Standard X3T10/1302D, sections 6.4 and 6.5 for the maximum
number of devices that can successfully operate at various interface transfer rates on SE and LVD daisy
chains.
Table 12 shows the interface transfer rates supported by the various drive models defined in this manual.
Table 12:
Interface transfer rates supported
Maximum transfer rate
Interface type/
drive models
Asynchronous Fast-5
Fast-10
Fast-20
Fast-40
Fast-80
SE
ST336918N
ST336938LW
yes
yes
yes
yes
yes
yes
yes
yes
no
no
LVD
yes
yes
9.6.3
SCSI interface cable requirements
The characteristics of cables used to connect Ultra160 SCSI parallel interface devices are discussed in detail
in Section 6 of ANSI Standard X3T10/1302D. The cable characteristics that must be considered when inter-
connecting the drives described in this manual in a Ultra160 SCSI parallel, daisy-chain interconnected system
are:
To minimize discontinuances and signal reflections, cables of different impedances should not be used in the
same bus. Implementations may require trade-offs in shielding effectiveness, cable length, number of loads
and spacing, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded
cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered.
Proper impedance matching is especially important in order to maintain adequate margin at FAST-20 and
FAST-40 SCSI transfer rates.
Note. For LVD operation, twisted pair cables are recommended. For LVD Fast-40 operation, twisted pair
cables are strongly recommended. For Fast-80 operation, twisted pair cables are required.
Barracuda 36ES2 Product Manual, Rev. B
9.6.4 Mating connectors
61
Part numbers for the different type connectors that mate with the various Barracuda 36ES2 I/O connectors are
given in the sections following.
9.6.4.1
Mating connectors for N model drives
N model drives require a nonshielded cable with a 50-conductor connector consisting of two rows or 25 female
contacts with adjacent contacts 100 mils apart.
Recommended mating flat cable connector part numbers are:
Closed end (for cable ends) [1] 3M-3425-7000
3M-3425-7050
W/O strain Relief, No Center Key
With Strain Relief, No Center Key
With Strain Relief, With Center Key
Dupont-66900-290
Open end (In daisy-chain) [1]
3M-3425-6000
3M-3425-6050
Dupont-66900-250
W/O strain Relief, No Center Key
With Strain Relief, No Center Key
With Strain Relief, With Center Key
The drive device connector is a nonshielded 50-conductor connector consisting of two rows of 25 male pins
Mating panel mount connector: 3M-CHE-2050-J01A10-KLE.
Figure 18. Nonshielded 50-pin SCSI device connector used on N drives
62
Barracuda 36ES2 Product Manual, Rev. B
’N’ Model
Drive
[6]
[1]
2 through X
SCSI devices [4]
SCSI ID 7 [5]
Pin 1
SCSI ID 1
(check your
adapter for Pin 1 location)
[1]
Host
Adapter
PCB
SCSI ID 0
[3]
[2]
[1] Closed end type 50-pin connector used. Terminators enabled.
[2] Open end type (in-line application) connector used. Terminators disabled.
[3] Host need not be on the end of the daisy-chain. Another device can be on the end with the terminator, the
host having no terminator.
[4] Total interface cable length must not exceed that specified in ANSI document X3T10/1302D (including
host adapter/initiator). The cable length restriction limits the total number of devices allowed.
[5] SCSI ID7 has highest arbitration priority, ID0 has lowest arbitration priority.
[6] Last drive on the daisy chain.
Figure 19. SCSI daisy chain interface cabling for N drives
Barracuda 36ES2 Product Manual, Rev. B
9.6.4.2 Mating connectors for LW model drives
63
The nonshielded cable connector shall be a 68 conductor connector consisting of two rows of 34 male contacts
with adjacent contacts 0.050 inch (1.27 mm) apart.
Recommended mating flat cable connector part numbers are:
Amp Model 786096-7
Amp Model 786090-7
Amp Model 749925-5
Female, 68-pin, panel mount
Female, 68-pin, cable mount
(50 mil conductor centers, 28 or 30 AWG wire)
Use two, 34 conductor, 50 mil center flat cable with this connector.
This type connector can only be used on cable ends. [1]
Amp Model 88-5870-294-5 W/O Strain Relief (25 mil conductor centers, 30 AWG wire).
Use either on cable ends or in cable middle section for daisy-chain
installations [1].
Amp Model 1-480420-0
Berg 69307-012
Power connector 4 circuit housing
12-position, 2 x 6, 2 mm receptacle housing
The drive device connector is a nonshielded 68 conductor connector consisting of two rows of 34 female pins
Figure 20. Nonshielded 68 pin SCSI device connector used on LW drives
64
Barracuda 36ES2 Product Manual, Rev. B
Note. Do not mix drives operating
single-ended with drives
operating differential on the
daisy chain.
’LW’ Model
Drive
[6]
[1]
2 through X
SCSI devices [4]
SCSI ID 7 [5]
Pin 1
(check your
adapter for Pin 1 location)
SCSI ID 1
[1]
Host
Adapter
PCB
[3]
[2]
SCSI ID 0
[1] Closed end type 68-pin connector used. Terminators enabled.
[2] Open end type (in-line application) connector used.
[3] Host need not be on the end of the daisy-chain. Another device can be on the end with the terminator, the
host having no terminator.
[4] Total interface cable length must not exceed that specified in ANSI document X3T10/1302D (including
host adapter/initiator). The cable length restriction limits the total number of devices allowed.
[5] SCSI ID7 has highest arbitration priority, then ID15 to ID8 (ID 8 very lowest).
[6] Last drive on the daisy chain.
[7] Open-end type 68-pin connector used. If end device, use external terminator and closed-end type 68-pin
connector.
Figure 21. SCSI daisy chain interface cabling for LW drives
Barracuda 36ES2 Product Manual, Rev. B
65
Table 13:
“N” model, single-ended I/O, 50 conductor, signal/contact assignments
Connector
contact
number [13]
Cable
conductor
number [12]
Connector
contact
number [13]
Signal
name [1]
Signal
name [1]
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
1
1
2
2
–DB0
–DB1
–DB2
–DB3
–DB4
–DB5
–DB6
–DB7
–DBP
GND
3
3
4
4
5
7
5
7
6
8
6
8
9
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
11
13
15
17
19
21
23
25*
27
29
31
33
35
37
39
41
43
45
47
49
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
GND
GND
TERMPWR
GND
GND
–ATN
GND
–BSY
–ACK
–RST
–MSG
–SEL
–C/D
–REQ
–I/O
*CAUTION: Connector contact 25 must not be connected to ground at the host end or the drive end of the
cable. If the I/O cable should accidently be plugged in upside down, terminator power on pin 26
will be shorted to ground.
Notes [ ]: See page following Table 15.
66
Barracuda 36ES2 Product Manual, Rev. B
LW 68-conductor single-ended (SE) P cable signal/pin assignments [11]
Table 14:
Note. A minus sign preceding a signal name indicates that signal is active low.
Connector
contact
number [3]
Connector
contact
number [3]
Signal
name [1]
Cable conductor
number [2]
Signal
name [1]
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
TermPwr
TermPwr
Reserved
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
1
1
2
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
–DB12
–DB13
–DB14
–DB15
–DBP1
–DB0
–DB1
–DB2
–DB3
–DB4
–DB5
–DB6
–DB7
–DBP
GND
2
3
4
3
4
5
7
6
8
5
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
6
7
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
GND
TermPwr
TermPwr
Reserved
GND
–ATN
GND
–BSY
–ACK
–RST
–MSG
–SEL
–C/D
–REQ
–I/O
–DB8
–DB9
–DB10
–DB11
Notes [ ]: See page following Table 15.
Barracuda 36ES2 Product Manual, Rev. B
67
Table 15:
Note. A minus sign preceding a signal name indicates that signal is active low.
Connector
contact
number [3]
Connector
contact
number [3]
Signal
name [1]
Cable conductor
number [2]
Signal
name [1]
+DB12
+DB13
+DB14
+DB15
+DBP1
+DB0
1
1
2
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
–DB12
–DB13
–DB14
–DB15
–DBP1
–DB0
2
3
4
3
4
5
7
6
8
5
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
6
7
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
+DB1
–DB1
+DB2
8
–DB2
+DB3
9
–DB3
+DB4
+DB5
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
–DB4
–DB5
+DB6
–DB6
+DB7
+DBP
–DB7
–DBP
Ground
Ground
TermPwr
TermPwr
Reserved
Ground
–ATN
Ground
DIFFSNS [8]
TermPwr
TermPwr
Reserved
Ground
+ATN
Ground
+BSY
Ground
–BSY
+ACK
–ACK
+RST
+MSG
+SEL
–RST
–MSG
–SEL
+C/D
+REQ
+I/O
–C/D
–REQ
–I/O
+DB8
+DB9
–DB8
–DB9
+DB10
+DB11
–DB10
–DB11
Notes [ ]: See page following this table.
68
Barracuda 36ES2 Product Manual, Rev. B
[2] The conductor number refers to the conductor position when using 0.025-inch (0.635 mm) centerline flat
ribbon cable. Other cables types may be used to implement equivalent contact assignments.
[3] Connector contacts are on 0.050 inch (1.27 mm) centers.
[4] Front panel LED signal; indicates drive activity for host front panel hard drive activity indicator.
[5] Asserted by host to enable Motor Start option (enables starting motor via SCSI bus command).
[6] Asserted by host to enable Delayed Motor Start option (motor starts at power on or after a delay of 12 sec-
[7] Binary code on A3, A2, A1 and A0 asserted by host to set up SCSI bus ID in drive.
[8] GND provides a means for differential devices to detect the presence of a single ended device on the bus.
Drive will not operate I/O bus at Ultra2 SCSI data rates if this is grounded.
[9] Signals [4] through [7] are used in place of installing jumpers and cables on option select connectors J2
and J6. See Section 8.1.1 notes.
[10] “NC” means no connection.
[11] 8 bit devices which are connected to the 16 data bit LVD I/O shall leave the following signals open: –DB8,
–DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.
8 bit devices which are connected to the 16 data bit single-ended (SE) I/O shall have the following signals
open: DB8, –DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.
All other signals should be connected as shown.
[12] The conductor number refers to the conductor position (right to left in Figure 18) when using 0.050-inch
(1.27 mm) centerline flat ribbon cable. Other cable types may be used to implement equivalent contact
assignments.
[13] Connector contacts are on 0.100-inch (2.54 mm) centers.
9.7
Electrical description
Barracuda 36ES2 LW model drives are multimode devices. That is, their I/O circuits can operate as either sin-
gle-ended or low voltage differential drivers/receivers (selectable using the I/O “DIFFSENS” line).
See ANSI Standard X3T10/1302D for details electrical specifications.
9.7.1
Multimode—SE and LVD alternatives
When the interface “DIFFSNS” line is between +0.35 V and +0.5 V, the drive interface circuits operate single-
ended and up to and including 20 M transfers/s (Fast-20 or Ultra SCSI). When “DIFFSNS” is between +0.7 V
and +1.9 V, the drive interface circuits operate low voltage differential and up to and including 160 M transfers/
s or less (Fast-160 or Ultra160 SCSI).
This multimode design does not allow dynamically changing transmission modes. Drives must operate only in
the mode for which the installation and interface cabling is designed. Multimode I/O circuits used by these
drives do not operate at high voltage differential levels and should never be exposed to high voltage differential
environments unless the common mode voltages in the environment are controlled to safe levels for single-
ended and low voltage differential devices (see the ANSI SPI-3 specification X3T10/1302D).
Multimode signals
Multimode circuit SE alternative signal characteristics are the same as described elsewhere in Section 9.7.1.
The SE alternative for these circuits is selected as described above. SE cables and termination must be used.
LW model drives do not have onboard terminators. The Multimode signal lines (either SE or LVD) should be
terminated with 110 ohm active terminator circuits at each end of the total cable. Termination of the I/O lines
must be provided for by the Host equipment designers or end users.
The SE and differential alternatives are mutually exclusive.
Barracuda 36ES2 Product Manual, Rev. B
Output characteristics
69
Each signal (Vs) driven by LVD interface drivers shall have the following output characteristics when measured
at the disc drive connector:
Steady state Low level output voltage* = –.95 V = < Vs = < –1.55 V (signal negation/logic 0)
Steady state High level output voltage* = –.95 V = < Vs = < 1.55 V (signal assertion/logic 1)
Differential voltage = +0.6 V minimum with common-mode voltage ranges 0.700 V = < Vcm = < 1.800 V.
*These voltages shall be measured between the output terminal and the SCSI device’s logic ground reference.
The output characteristics shall additionally conform to EIA RS-485.
Figure 22. LVD output signals
Input characteristics
Each signal (Vs) received by LVD interface receiver circuits shall have the following input characteristics when
measured at the disk drive connector:
Steady state Low level output voltage* = 0.030 V = < Vs = < 3.6 V (signal negation/logic 0)
Steady state High level output voltage* = –3.6 V = < Vs = < –0.030 V (signal assertion/logic 1)
Differential voltage = +0.30 V minimum with common-mode voltage ranges 0.700 V = < Vcm = < 1.800 V.
(X3T10/1302D)
*These voltages shall be measured between the output terminal and the SCSI device’s logic ground reference.
Input characteristics shall additionally conform to EIA RS-485-983.
Figure 23. Typical SE-LVD alternative transmitter receiver circuits
70
Barracuda 36ES2 Product Manual, Rev. B
9.7.1.1
Single-ended drivers/receivers for N models
For “N” models which use single-ended drivers and receivers, typical circuits are shown in Figure 24. Termina-
tor circuits (see Note [1]) are to be enabled only when the disc drive is first or last in the daisy-chain.
Transmitter characteristics
Single-ended drives use an ANSI SCSI compatible open collector single-ended driver. This driver is capable of
sinking a current of 48 mA with a low level output voltage of 0.4 volt.
Receiver characteristics
Single-ended drives use an ANSI SCSI single-ended receiver with hysteresis gate or equivalent as a line
receiver.
Figure 24. Single-ended transmitters and receivers on N models
Notes.
[1] Part of active terminator circuits. Non-removable LSI terminators, enabled in the drive (model N only) with
jumper plug TE when it is first of last in the daisy-chain.
[2] ANSI SCSI compatible circuits.
[3] Total interface cable length should not exceed that specified in ANSI Standard T10/1302D.
[4] Source of drive terminator power is an active circuit which has an input source voltage selected by jumper
[5] Interface signal levels and logical sense at the drive I/O connector for N models are defined as follows:
Vil (low-level input voltage) = 1.0 V maximum (signal true); minimum = Vss – 0.5 V.
Vih (high-level input voltage) = 1.9 V minimum (signal false); maximum = Vdd +0.5V.
Vihys (Input Hysteresis) = 425 mV minimum
See ANSI Standard T10/1302D (SPI-3) for detailed electrical specifications.
9.7.1.2
Single-ended drivers/receivers for LW models
The maximum total cable length allowed with drives using single-ended I/O driver and receiver circuits
depends on several factors. Table 16 lists the maximum lengths allowed for different configurations of drive
usage. These values are from the SPI-3 document. All device I/O lines must have equal to or less than 25 pf
capacitance to ground, measured at the beginning of the stub.
Barracuda 36ES2 Product Manual, Rev. B
71
Table 16:
Cable characteristics for single-ended circuits
Transmission line impedance
Maximum number of
devices on the bus
Maximum cable
length allowed
I/O transfer rate
REQ/ACK
Other signals
<10M transfers/s
<20M transfers/s
<20M transfers/s
16 (wide SCSI bus)
4 (wide SCSI bus)
8 (wide SCSI bus)
6 meters (19.7 ft)
3 meters (9.8 ft)
1.5 meters (4.9 ft)
90 + 6 Ohms
90 + 6 Ohms
90 + 6 Ohms
90 + 10 Ohms
90 + 10 Ohms
90 + 10 Ohms
A stub length of no more than 0.1 meter (0.33 ft) is allowed off the mainline interconnection with any connected
equipment. The stub length is measured from the transceiver to the connection to the mainline SCSI bus.
9.7.1.3
Low voltage differential I/O circuits
The maximum total cable length for use with drives using LVD I/O drivers and receiver circuits is 12 meters
(39.37 ft.). A stub length of no more than 0.1 meter is allowed off the mainline interconnection with any con-
9.7.1.4
General cable characteristics
A characteristic impedance of 100 ohm + 10% is recommended for unshielded flat or twisted pair ribbon cable.
However, most available cables have a somewhat lower characteristic impedance. To Minimize discontinuities
and signal reflections, cables of different impedances should not be used in the same bus. Implementations
may require trade-offs in shielding effectiveness, cable length, the number of loads, transfer rates, and cost to
achieve satisfactory system operation. If shielded and unshielded cables are mixed within the same SCSI bus,
the effect of impedance mismatch must be carefully considered. Proper impedance matching is especially
important in order to maintain adequate margin at fast SCSI transfer rates.
72
Barracuda 36ES2 Product Manual, Rev. B
9.8
Terminator requirements
N models have active, permanently mounted LSI terminator circuits on board the PCB.
All single initiator/single target (non-daisy-chain) applications require that the Initiator and disc drive be termi-
nated. Daisy-chain applications require that only the units at each end of the daisy-chain be terminated. All
Note. Remove drive terminator enabling jumper TE where terminators are not required. Removal of termina-
from the circuit.
It is required that ANSI SCSI-2 Standard’s Alternative 2 termination (active termination) be used for applica-
tions with single-ended mode, especially if the bus will be operated at transfer rates above 5 Mbytes/sec.
Note. Active terminators are required for use in the daisy chain as described above. Do not use passive ter-
minators at any transfer speed. Do not mix active and passive terminators on the same SCSI bus.
Caution: LW models do not have onboard internal terminators. The user, systems integrator or host equip-
ment manufacturer must provide a terminator arrangement external to the drive when termination is
required. For LW drives, terminator modules can be purchased that plug between the SCSI I/O
cable and the drive I/O connector or on the end of a short I/O cable stub extending past the last
cable connector.
ANSI Standard X3T10/1143D contains additional details about SCSI bus terminator and terminator power
requirements.
9.9
Terminator power
N drives
You can configure terminator power in four different ways. See Section 8.1 for illustrations that show how to
place jumpers enabling each of the following terminator power configurations:
1. Drive accepts terminator power through SCSI bus pin 26 on N models.
2. Drive supplies power to the SCSI bus.
3. Drive provides terminator power for optional internal terminator resistors using the drive’s power connector.
4. Drive provides power to its own terminators and to the SCSI bus terminator power line.
SCSI devices providing terminator power (TERMPWR) must have the following characteristics:
8-bit SCSI:
V TERM = 4.25 V to 5.25 V
800 mA minimum source drive capability
1.0 A maximum
16-bit SCSI:
V TERM = 4.25 V to 5.25 V
1,500 mA minimum source drive capability
3.0 A maximum
LW drives
You can configure terminator power from the drive to the SCSI bus or have the host adaptor or other device
supply terminator power to the external terminator. See Section 8.1 for illustrations that show how to place
jumpers for this configuration.
Barracuda 36ES2 Product Manual, Rev. B
73
9.10
Disc drive SCSI timing
Disc drive SCSI timing
Table 17:
Waveform
symbol [1]
Waveform
table [1]
Description
Typical timing
Target Select Time (no Arbitration)
Target Select Time (with Arbitration)
Target Select to Command
T00
T01
T02
T03
T04
T05
T06
T07
T08
T09
T10
T11
N/A
<1 µs
4.5-1,2
4.5-1
1.93 µs
3.77 µs
1.57 µs
3.36 µs
Target Select to MSG Out
4.5-2
Identify MSG to Command
4.5-3
Command to Status
4.5-5
Command Dependent
Command Dependent
Command Dependent
Command Dependent
Command Dependent
0.52 µs
Command to Data (para. In)
Command to Data (para. Out)
Command to Data (Write to Data Buffer)
Command to Disconnect MSG
Disconnect MSG to Bus Free
4.5-9
4.5-10
4.5-10
4.5-6
4.5-6,14
4.5-6
Disconnect to Arbitration (for Reselect)
Command Dependent
This measures disconnected CMD overhead
Target win Arbitration (for Reselect)
Arbitration to Reselect
T12
T13
T14
T15
T16
T17
T18
T19
T20
T21
T22
4.5-7
3.00 µs
4.5-7
1.60 µs
Reselect to Identify MSG In
4.5-7
1.39 µs
Reselect Identify MSG to Status
Reselect Identify MSG to Data (media)
Data to Status
4.5-8
Command Dependent
Command Dependent
Command Dependent
0.98 µs
4.5-11
4.5-15
4.5-5,8,15
4.5-5,8,15
4.5-14
4.5-14
4.5-4
Status to Command Complete MSG
Command Complete MSG to Bus Free
Data to Save Data Pointer MSG
Save Data Pointer MSG to Disconnect MSG
Command Byte Transfer
0.51 µs
4.00 µs
0.79 µs
0.04 µs
Next Command Byte Access:
4.5-4
Next CDB Byte Access (Byte 2 of 6)
Next CDB Byte Access (Byte 3 of 6)
Next CDB Byte Access (Byte 4 of 6)
Next CDB Byte Access (Byte 5 of 6)
Next CDB Byte Access (Byte 6 of 6)
Next CDB Byte Access (Byte 2 of 10)
Next CDB Byte Access (Byte 3 of 10)
Next CDB Byte Access (Byte 4 of 10)
Next CDB Byte Access (Byte 5 of 10)
Next CDB Byte Access (Byte 6 of 10)
Next CDB Byte Access (Byte 7 of 10)
Next CDB Byte Access (Byte 8 of 10)
Next CDB Byte Access (Byte 9 of 10)
Next CDB Byte Access (Byte 10 of 10)
T23.6.2
4.5-4
0.58 µs
T23.6.3
4.5-4
0.12 µs
T23.6.4
4.5-4
0.12 µs
T23.6.5
4.5-4
0.12 µs
T23.6.6
4.5-4
0.12 µs
T23.10.2
T23.10.3
T23.10.4
T23.10.5
T23.10.6
T23.10.7
T23.10.8
T23.10.9
T23.10.10
4.5-4
0.59 µs
4.5-4
0.11 µs 1 µs
0.12 µs 1 µs
0.11 µs 1 µs
0.11 µs 1 µs
0.13 µs 1 µs
0.12 µs 1 µs
0.12 µs 1 µs
0.12 µs 1 µs
4.5-4
4.5-4
4.5-4
4.5-4
4.5-4
4.5-4
4.5-4
74
Barracuda 36ES2 Product Manual, Rev. B
Waveform
Table 17:
Disc drive SCSI timing (Continued)
Waveform
symbol [1]
Description
table [1]
Typical timing
Data In Byte Transfer (parameter)
Data Out Byte Transfer (parameter)
Next Data In Byte Access (parameter)
Next Data Out Byte Access (parameter)
Next Data In Byte access (media [2]
Next Data Out Byte access (media [2]
MSG IN Byte Transfer
T24
T25
T26
T27
T28
T29
T30
T31
T32
T33
T34
4.5-12
0.04 µs
0.04 µs
0.12 µs
0.12 µs
0.04 µs
0.04 µs
0.12 µs
0.12 µs
0.04 µs
0.04 µs
0.04 µs
4.5-13
4.5-12
4.5-13
4.5-12
4.5-13
4.5-12
4.5-13
4.5-5,7,8,14,15
4.5-2
MSG OUT Byte Transfer
STATUS Byte Transfer
4.5-5,8,15
Synchronous Data Transfer Characteristics:
–
–
various (800 ns max)
Notes.
[1] See the SCSI Interface Product Manual, part number 75789509, timing examples section.
[3] Synchronous Transfer Period is determined by negotiations between an Initiator and a Drive. The Drive is
capable of setting periods as given in Section 9.5. See also the Synchronous data transfer section and the
Extended messages section of the SCSI Interface Product Manual, for a description of synchronous data
transfer operation.
9.11
Drive activity LED
The following table provides drive activity LED status.
Table 18:
Drive activity LED status
Spindle status
Command status
LED status
Spinning up with DC power applied
Spun down
N/A
On until spinup is complete
On while processing the command
Off due to absence of power
On while processing the command
Off
Start Unit
Powered down by removal of DC power N/A
Spun up
Stop Unit
Spun down
Spun down
Spun down
Spun down
Spun up
No command activity
Write/Read Buffer
SCSI Bus Reset
Test Unit Ready
No command activity
Write/Read
On while processing the command
On while processing the reset
On while processing the command
Off
Spun up
On while processing the command
On while processing the reset
On while processing the command
Spun up
SCSI Bus Reset
Test Unit Ready
Spun up
Spun up
Format with Immediate option on On while the command is initially processed
Format without Immediate LED toggles on/off on each cylinder boundary
Spun up
Barracuda 36ES2 Product Manual, Rev. B
75
10.0
Seagate Technology support services
Online Services
Internet
www.seagate.com for information about Seagate products and services. Worldwide support is available 24
hours daily by e-mail for your disc or tape questions.
Presales Support:
Technical Support:
Reseller Marketplace
Reseller Marketplace is the storage industry’s first collaborative, e-commerce marketplace offering resellers
the fastest, most efficient online purchasing process for Seagate storage solutions. The Reseller Marketplace
at marketplace.seagate.com, an exclusive service for US resellers participating in the Seagate Partner Pro-
gram (SPP), is designed to streamline the purchasing process of Seagate solutions and provide unprece-
dented value to Seagate’s resellers through real-time pricing and availability, fast and easy comparison
shopping, and seamless integration with key distributors for a one-stop shopping experience.
For support, questions and comments: reseller.seagate.com/benefits/T1.html or 1-877-271-3285 (toll-free)
9 A.M. to 7 P.M. (eastern time) Monday through Friday.
Tape Purchases
US customers can purchase Seagate data cartridges, tape supplies, accessories, and select Seagate tape
drive products 24 hours daily at buytape.seagate.com.
Automated Services
SeaFONE® (1-800-SEAGATE) is Seagate’s toll-free number (1-800-732-4283) to access our automated self-
help services. Using a touch-tone phone, you can find answers to service phone numbers, commonly asked
questions, troubleshooting tips and specifications for disc drives and tape drives 24 hours daily. International
callers can reach this service by dialing +1-405-936-1234.
SeaFAX® (1-800-SEAGATE) is Seagate’s automated FAX delivery system. Using a touch-tone phone, you can
obtain technical support information by return FAX 24 hours daily.
Presales Support
Presales Support
Our Presales Support staff can help you determine which Seagate products are best suited for your specific
application or computer system.
Technical Support
If you need help installing your drive, consult your dealer. Dealers are familiar with their unique system configu-
rations and can help you with system conflicts and other technical issues. If you need additional help, you can
talk to a Seagate technical support specialist. Before calling, note your system configuration and drive model
number (ST####).
SeaTDD™ (+1-405-936-1687) is a telecommunications device for the deaf (TDD). You can send questions or
comments 24 hours daily and exchange messages with a technical support specialist from 8:00 A.M. to
11:45 A.M. and 1:00 P.M. to 6:00 P.M. (central time) Monday through Friday.
76
Barracuda 36ES2 Product Manual, Rev. B
Customer Service (CSO)
Warranty Service
Seagate offers worldwide customer support for Seagate drives. Seagate direct OEM, Distribution and System
Integrator customers should contact their Seagate service center representative for warranty information.
Other customers should contact their place of purchase.
Authorized Service Centers
If you live outside the US, you can contact an Authorized Service Center for service.
USA/Canada/Latin America Support Services
Presales Support
Call Center
Disc:
Toll-free
Direct dial
FAX
1-877-271-3285
+405-936-1210
+1-405-936-1683
Tape:
1-800-626-6637
+1-714-641-2500
+1-714-641-2410
Technical Support (SeaFONE)
1-800-SEAGATE or +1-405-936-1234 (for specific product phone number)
FAX: Disc: +1-405-936-1685; Tape and Server Appliance: +1-405-936-1683
SeaFAX
SeaTDD
1-800-SEAGATE
+1-405-936-1687
Warranty Service
Call Center
Toll-free
Direct dial
FAX / Internet
USA, Mexico and
1-800-468-3472
+1-405-936-1456
+1-405-936-1462
Latin America
Canada
Memofix*
1-800-636-6349
1-800-624-9857
+1-905-660-4936
+1-905-812-8099
+1-905-660-4951
Adtech*
+1-905-812-7807
Brazil
MA Centro de Serviços*
—
+55-21-2509-7267
+55-21-2507-6672
e-mail: [email protected]
European Support Services
For European customer support, dial the toll-free number for your specific country for presales support, techni-
cal support, SeaFAX and warranty service.
If your country is not listed here, dial our European call center at +31-20-316-7222 from 8:30 A.M. to 5:00 P.M.
(European central time) Monday through Friday. The European call center is located in Amsterdam, The Neth-
erlands.
Call Center
Austria
0 800-20 12 90
0 800-74 876
80 88 12 66
0 800-90 90 52
0 800-182 6831
1 800-55 21 22
800-790695
Belgium
Denmark
France
Germany
Ireland
Italy
Netherlands
Norway
Poland
0 800-732 4283
800-113 91
00 800-311 12 38
*Authorized Service Centers
Barracuda 36ES2 Product Manual, Rev. B
77
Spain
900-98 31 24
Sweden
0 207 90 073
Switzerland
Turkey
United Kingdom
0 800-83 84 11
00 800-31 92 91 40
0 800-783 5177
FAX Services—All European Countries
Presales/Technical Support/Warranty Service 31-20-653-3513
Africa/Middle East Support Services
For presales, technical support, warranty service and FAX services in Africa and the Middle East, dial our
European call center at +31-20-316-7222 from 8:30 A.M. to 5:00 P.M. (European central time) Monday through
Friday, or send a FAX to +31-20-653-3513. The European call center is located in Amsterdam, The Nether-
lands.
Asia/Pacific Support Services
For Asia/Pacific presales and technical support, dial the toll-free number for your specific country. The Asia/
Pacific toll-free numbers are available from 6:00 A.M. to 10:45 A.M. and 12:00 P.M. to 6:00 P.M. (Australian east-
ern time) Monday through Friday. If your country is not listed here, direct dial one of our technical support loca-
tions.
Call Center
Australia
China
Toll-free
1800-14-7201
—
Direct dial
—
—
FAX
—
+86-10-6871-4316
Hong Kong
Indonesia
Japan
800-90-0474
001-803-1-003-2165
—
—
—
—
+852-2368 7173
—
+81-3-5462-2979
Malaysia
New Zealand
Singapore
Taiwan
1-800-80-2335
0800-443988
800-1101-150
—
—
—
—
—
—
+65-6488-7528
+886-2-2715-2923
—
+886-2-2514-2237
—
Thailand
001-800-11-0032165
Warranty Service
Call Center
Asia/Pacific
Australia
Toll-free
—
1800-12-9277
—
Direct dial
+65-6485-3595
—
FAX
+65-6485-4860
—
Japan
+81-3-5462-2904
+81-3-5462-2979
78
Barracuda 36ES2 Product Manual, Rev. B
Barracuda 36ES2 Product Manual, Rev. B
79
Index
Symbols
Numerics
A
B
D
C
80
Barracuda 36ES2 Product Manual, Rev. B
disc drive
F
G
H
E
Barracuda 36ES2 Product Manual, Rev. B
81
messages
I
initiator
J
K
L
N
O
M
82
Barracuda 36ES2 Product Manual, Rev. B
R
P
S
SCSI
Barracuda 36ES2 Product Manual, Rev. B
83
Self-Monitoring Analysis and Reporting Technology.
T
Taiwanese Bureau of Standards, Metrology, and
See also cooling
service
U
V
W
84
Barracuda 36ES2 Product Manual, Rev. B
X
Z
Seagate Technology LLC.
920 Disc Drive, Scotts Valley, California 95066-4544, USA
Publication Number: 100182971, Rev. B, Printed in USA
|
