Product Manual
Cheetah 15K.5 SCSI
ST3300655LW
ST3146855LW
ST373455LW
ST3300655LC
ST3146855LC
ST373455LC
100384776
Rev. J
May 2010
© 2010, Seagate Technology LLC All rights reserved.
Publication number: 100384776, Rev. J May 2010
Seagate, Seagate Technology and the Wave logo are registered trademarks of Seagate Technology
LLC in the United States and/or other countries. Cheetah, SeaTools and SeaTDD are either trade
marks or registered trademarks of Seagate Technology LLC or one of its affiliated companies in the
United States and/or other countries. All other trademarks or registered trademarks are the property
of their respective owners.
No part of this publication may be reproduced in any form without written permission of Seagate
Technology LLC. Call 877-PUB-TEK1(877-782-8651) to request permission.
One gigabyte, or GB, equals one billion bytes when referring to hard drive capacity. Accessible capacity
may vary depending on operating environment and formatting. Quantitative usage examples for various
applications are for illustrative purposes. Actual quantities will vary based on various factors, including file
size, file format, features and application software. Seagate reserves the right to change, without notice,
product offerings or specifications.
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Contents
1.0 Seagate Technology support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.0 Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3.0 Applicable standards and reference documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1.1 Electromagnetic compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1.2 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.2 Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.3 European Union Restriction of Hazardous Substances (RoHS) . . . . . . . . . . . . . . . . . . . . . 4
3.4 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.0 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Standard features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Media characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.3 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.4 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.5 Formatted capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.5.1 Programmable drive capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.6 Factory installed accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.7 Options (factory installed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.8 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1 Internal drive characteristics (transparent to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.2 SCSI performance characteristics (visible to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.2.1 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2.2 Format command execution time (minutes) [1] . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2.3 Generalized performance characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.4 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.5 Cache operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.5.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.0 Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1.1 Recoverable Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1.2 Unrecoverable Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1.3 Seek errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2 Reliability and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2.1 Annualized Failure Rate (AFR) and Mean Time Between Failures (MTBF) . . . 15
6.2.2 Preventive maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2.3 Hot plugging Cheetah 15K.5 SCSI disc drives. . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2.4 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2.5 Thermal monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2.6 Drive Self Test (DST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2.7 Product warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.1 AC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.2 DC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.2.1 Conducted noise immunity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.2.3 Current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.3 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Cheetah 15K.5 SCSI Product Manual, Rev. J i
7.4 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.4.3 Effective altitude (sea level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.4.6 Corrosive environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.4.7 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.4.8 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.0 Defect and error management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.1 Drive internal defects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.2 Drive error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.3 SCSI systems errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
8.4 Background Media Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
8.5 Media Pre-Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
8.6 Deferred Auto-Reallocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.7 Idle Read After Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
9.0 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.1 Drive ID/option select header. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.1.1 Notes for Figures 10 and 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.1.2 Function description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
9.2 Drive orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.3 Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.4 Drive mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.5 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
10.0 Interface requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
10.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
10.2 SCSI interface messages supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
10.3 SCSI interface commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
10.3.1 Inquiry Vital Product data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
10.3.2 Mode Sense data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
10.4 SCSI bus conditions and miscellaneous features supported. . . . . . . . . . . . . . . . . . . . . . . 55
10.5 Synchronous data transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
10.5.1 Synchronous data transfer periods supported . . . . . . . . . . . . . . . . . . . . . . . . . . 56
10.5.2 REQ/ACK offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
10.6 Physical interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
10.6.1 DC cable and connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
10.6.2 SCSI interface physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
10.6.3 SCSI interface cable requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10.6.4 Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10.7 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
10.7.1 Multimode—SE and LVD alternatives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
10.8 Terminator requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
10.9 Terminator power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
10.10 Disc drive SCSI timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
10.11 Drive activity LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
ii Cheetah 15K.5 SCSI Product Manual, Rev. J
List of Figures
Figure 1. Typical ST3300655LW drive +5 V LVD current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 2. ST3300655LC DC current and power vs. IOPS (LVD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 3. ST3146855LC DC current and power vs. IOPS (LVD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 4. ST373455LC DC current and power vs. IOPS (LVD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 5. Locations of the HDA temperature check point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 6. Recommended mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 7. LW mounting configuration dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 8. LC mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 9. J5 jumper header (on LW models only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 10. J6 option select header (on LW models only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 11. Air flow (suggested) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 12. LW model drive physical interface (68-pin J1 SCSI I/O connector). . . . . . . . . . . . . . . . . . . . . 57
Figure 13. LC model drive physical interface (80-pin J1 SCSI I/O connector) . . . . . . . . . . . . . . . . . . . . . 58
Figure 14. SCSI daisy-chain interface cabling for LW drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 15. Nonshielded 68-pin SCSI device connector used on LW drives . . . . . . . . . . . . . . . . . . . . . . . 62
Figure 16. Nonshielded 80-pin SCSI SCA-2 connector used on LC drives . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 17. Typical SE-LVD alternative transmitter receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Cheetah 15K.5 SCSI Product Manual, Rev. J iii
1.0 Seagate Technology support services
SEAGATE ONLINE SUPPORT and SERVICES
For information regarding products and services, visit http://www.seagate.com/www/en-us/about/contact_us/
Available services include:
Presales & Technical support
Global Support Services telephone numbers & business hours
Authorized Service Centers
For information regarding Warranty Support, visit
http://www.sea
For information regarding Data Recovery Services, visit http://www.i365.com
For Seagate OEM & Distribution partner portal, visit https://direct.seagate.com/portal/system
For Seagate reseller portal, visit http://spp.seagate.com
gate.com/www/en-us/support/warranty_&_returns_assistance
Cheetah 15K.5 SCSI Product Manual, Rev. J 1
2.0 Scope
This manual describes Seagate® Technology LLC, Cheetah® 15K.5 SCSI disc drives.
Cheetah 15K.5 SCSI drives support the sm all computer system interface (SCSI) as described in the ANSI
SCSI SPI-4 interface specifications to the extent described in this manual. T he SCSI Interface Manual (part
number 100293069) describes general SCSI interface characteristics of this and other families of Seagate
drives.
From this point on in this product manual the reference to Cheetah 15K.5 SCSI models is referred to as “the
drive” unless references to individual models are necessary.
2 Cheetah 15K.5 SCSI Product Manual, Rev. J
3.0 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 optimum 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 regulation. In particular, the drive must be securely mounted in order to guarantee the specified performance characteristics. Mounting by bottom holes must meet the requirements of Section 9.4.
3.1 Standards
The Cheetah 15K.5 SCSI family complies w ith Seagate s tandards as noted in the appro priate sections of this
Manual, the Seagate Parallel SCSI Interface Manual, part number 100293069, and the SCSI Commands Ref-
erence Manual, part number 100293068.
The Cheetah 15K.5 SCSI disc drive is a UL recognized component per UL1950, CSA certified to CSA C22.2
No. 950-95, and VDE or TUV certified to EN60950.
3.1.1 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 Communications.
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 Regulations 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 enclos ure does not prov ide adequate shielding. If the I/O cables are external to
the enclosure, shielded cables should be used, with the shields gro unded to the enclosure and to the host controller.
3.1.2 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 Table 3, DC power requirements.
Cheetah 15K.5 SCSI Product Manual, Rev. J 3
3.2 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 teste d in a repr esen t ative system for typical applications. The selected system 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.
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 Management Agency (SMA).
Korean MIC
If this model has the Korean Ministry of Information and Communication (MIC) logo, it complies with p aragr aph
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.
Taiwanese BSMI
If this model has the Chinese National Standard (CNS) 13438 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 Inspection (BSMI).
3.3 European Union Restriction of Hazardous Substances (RoHS)
The European Union Restriction of Hazardous Substances (RoHS) Directive restricts the presence of chemical
substances, including Lead (Pb), in electronic products effective July 2006.
A number of parts and materials in Seagate products are procured from external suppliers. We rely on the representations of our suppliers regarding the presence of RoHS substances in these parts and materials. Our
supplier contracts require compliance with our ch emical substance restrictions, and our suppliers document
their compliance with our requirements by providing material conten t declarations for all p arts and materials for
the disc drives documented in this publication. Current supplier declarations include disclosure of the inclusion
of any RoHS-regulated substance in such parts or materials.
4 Cheetah 15K.5 SCSI Product Manual, Rev. J
Seagate also has internal systems in place to ensure on going compliance with the RoHS Directive and all laws
and regulations which restrict chemical content in electronic products. These systems include standard operating procedures that ensure that restricted substances are not utilized in our manufacturing operations, laboratory analytical validation testing, and an internal auditing process to ensure that all standard operating
procedures are complied with.
3.4 Reference documents
Cheetah 15K.5 SCSI Installation Guide Seagate P/N 100384777
Safety and Regulatory Agency Specifications Seagate P/N 75789512
SCSI Commands Reference Manual Seagate P/N 100293068
Parallel SCSI Interface Product Manual Seagate P/N 100293069
Applicable ANSI small computer system interface (SCSI) document numbers:
T10/1143D Enhanced SCSI Parallel Interface (EPI)
T10/1416D Primary Commands-3 (SPC-3)
T10/1417D SCSI Block Commands (SBC-2)
T10/1157D SCSI Architectural Model-2 (SAM-2)
T10/1365D SPI-4 (SCSI Parallel Interface version 4)
SFF-8451 Specification for SCA-2 Unshielded Connections
Package Test Specification Seagate P/N 30190-001 (under 100 lb.)
Package Test Specification Seagate P/N 30191-001 (over 100 lb.)
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.
Cheetah 15K.5 SCSI Product Manual, Rev. J 5
4.0 General description
Cheetah 15K.5 SCSI drives combine Tunneling Magnetoresistive (TMR) heads and a wide Ultra320 SCSI
interface to provide high performance, high capacity data storage for a variety of systems including engineering workstations, network servers, mainframes, and supercomputers.
Ultra320 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 SCSI-1 and SCSI-2 data transfer rates for backward compatibility with non-Ultra/Ultra2/
Ultra160/Ultra320 SCSI host adapters.
Table 1 lists the features that differentiate the Cheet ah 15K.5 SCSI models.
Table 1: Drive model number vs. differentiating features
Model number
ST3300655LW
ST3146855LW
ST373455LW
ST3300655LC
ST3146855LC
ST373455LC
Number of
active heads I/O circuit type [1]
8
4
Single-ended (SE) and low voltage
differential (LVD)
2
8
4
Single-ended (SE) and low voltage
differential (LVD)
2
Number of I/O
connector pins
68
80
[1] See Section 10.6 for details and definitions.
The drive records and recovers data on approximately 70 mm non-removable discs.
The drive supports the Small Computer System Interface (SCSI) as described in the ANSI SCSI interface
specifications to the extent descr ibed in this m anual (volume 1), which defin es the prod uct performan ce characteristics of the Cheetah 15K.5 SCSI family of drives, the Parallel SCSI Interface Manual, part number
100293069, and the SCSI Commands Reference Manual, part number 100293068, which describe the general interface characteristics of this and other families of Seagate SCSI drives.
The drive’s interface supports multiple initiators, disconnect/reconnect, self-configuring host software, and logical block addressing.
The head and disc assembly (HDA) is sealed at the factory. Air circulates within the HDA through a nonreplaceable 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, actuator, etc.) as this requires special facilities. The drive contains no replaceable parts. Opening the HDA voids
your warranty.
Cheetah 15K.5 SCSI drives use a dedicated la nd ing zone at the i nne rmo st rad ius of the media to elimin ate th e
possibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the
landing zone when power is removed.
6 Cheetah 15K.5 SCSI Product Manual, Rev. J
An automatic shipping lock prevents potential damage to the heads and discs that results from movement during shipping and handling. The shipping lock automatically disengages when power is applied to the drive and
the head load process begins.
A high-performance actuator assembly with a low-inertia, balanced, patented, straight-arm design provides
excellent performance with minimal power dissipation.
4.1 Standard features
The Cheetah 15K.5 SCSI family has the following standard features:
• Perpendicular recording technology.
• Integrated Ultra320 SCSI interface.
• Multimode SCSI drivers and receivers—single-ended (SE) and low voltage differential (LVD)
• 16 bit I/O data bus
• Asynchronous and synchronous data transfer protocol
• Firmware downloadable via SCSI interface
• Selectable even byte sector sizes from 512 to 528 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)
• ECC burst correction length of up to 400.
• 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
• Zoned bit recording (ZBR)
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• 16,384 kbytes data buffer
• Hot plug compatibility (Section 10.6.4.2 lists proper host connector needed) for LC model drives
• Drive Self Test (DST)
• Supports SCSI bus fairness
4.2 Media characteristics
The media used on the drive has an aluminum substrate coated with a thin film magnetic material, overcoated
with a proprietary protective layer for improved durability and environmental protection.
Cheetah 15K.5 SCSI Product Manual, Rev. J 7
4.3 Performance
• Supports industry standard Ultra320 SCSI interface
• Programmable multi-segmentable cache buffer (see Section 5.5)
• 15k RPM spindle. Average latency = 2.0 msec
• Command queuing of up to 64 commands
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
4.4 Reliability
• Annualized Failure Rate (AFR) of 0.62%
• Increased LSI circuitry integration
• Incorporates industry-standard Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.)
• 5-year warranty
4.5 Formatted capacities
Sta ndard OEM mode ls are formatted to 512 bytes per b lock. The se ctor size is select able at fo rmat 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.
To provide a stable target capacity environment and at the same time provide users with flexibility if they
choose, Seagate recommends product planning in one of two modes:
1. Seagate designs specify capacity points at certain sector sizes that Seagate guarantees current and future
products will meet. We recommend customers use this capacity in their project planning, as it ensures a
stable operating point with backward and forward compatibility from generation to generation. The current
guaranteed operating points for this product are:
Sector Size
512 585,937,500 22ECB25C 286,749,488 11177330 143,374,744 88BB998
514 574,712,644 22416B44 282,050,768 10CFC0D0 141,025,384 867E068
520 573,653,847 22314357 280,790,184 10BC84A8 140,395,092 85E4254
522 570,053,000 21FA5188 279,041,740 10A1D6CC 139,463,602 8500BB2
524 566,007,800 21BC97F8 275,154,368 106685C0 137,577,184 83342E0
528 557,874,778 21407E5A 272,662,935 10408197h 136,331,467 82040CBh
ST3300655LW
ST3300655LC
Decimal Hex Decimal Hex Decimal Hex
ST3146855LW
ST3146855LC
ST373455LW
ST373455LC
2. Seagate drives also may be used at th e maximum ava ilable cap acity at a given sector size, but the excess
capacity above the guaranteed level will vary between 10K and 15K families and from generation to gener
ation, depending on how each sector size actually formats out for zone frequencies and splits over servo
bursts. This added capacity potential may range from 0.1 to 1.3 percent above the guaranteed capacities
listed above. Using the drives in this manner gives the absolute maximum capacity potential, but the user
must determine if the extra capacity potential is useful, or whether their assurance of backward and for
ward compatibility takes precedence.
-
-
8 Cheetah 15K.5 SCSI Product Manual, Rev. J
4.5.1 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 Manual. 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.
4.6 Factory installed accessories
OEM St an dard d rives a re shippe d with the Chee tah 15K.5 Installation Guide, part number 100384777, and the
Safety and Regulatory Agency Specifications, part number 75789512 (unless otherwise spe cified). The facto ry
also ships with the drive a small bag of jumper plugs used for the J5 and J6 option select jumper headers (on
LW models only).
4.7 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 maxim um protection
against transit damage. Units shipped individually require additional protection as p rovided by the sin gle unit
shipping pack. Users planning single unit distribution should specify this option.
•The Cheetah 15K.5 Installation Guide, part number 100384777, usually ships with each standard OEM
drive. Extra copies may be ordered.
•The Safety and Regulatory Agency Specifications, part number 75789512, usually ships with each standard
OEM drive. Extra copies may be ordered.
4.8 Accessories
The following accessories are available. All accessories may be installed in the field.
• Single unit shipping pack.
Cheetah 15K.5 SCSI Product Manual, Rev. J 9
5.0 Performance characteristics
5.1 Internal drive characteristics (transparent to user)
ST3300655LW
ST3300655LC
ST3146855LW
ST3146855LC
ST373455LW
ST373455LC
Drive capacity 300.0 146.8 73.4 GBytes (formatted)*,**
Read/write heads 8 4 2
Tracks/surface (total) 74,340 74,340 74,340 Tracks (user accessible)
Tracks/inch 125,000 125,000 125,000 TPI
Peak bits/inch 890k 890k 890k BPI
Areal Density 110 110 110 Gbits/inch
2
Internal data rate 960 to 1607 960 to 1607 960 to 1607 Mbits/sec (variable with zone)
Disc rotational speed 15k 15k 15k rpm
Average rotational latency 2.0 2.0 2.0 msec
* One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
** Rounded off value.
5.2 SCSI performance characteristics (visible to user)
The values given in Section 5.2.1 apply to all models of the Cheetah 15K.5 SCSI family unless otherwise specified. Refer to the Parallel SCSI Interface Manual for additional timing details.
10 Cheetah 15K.5 SCSI Product Manual, Rev. J
5.2.1 Seek time
Not including controller overhead (msec)
Read Write
1,2
Average Typical 3.5 4.0
Single Track Typical 0.2 0.4
Full Stroke Typical 6.8 7.5
1. Typical access times are measured under nominal conditions of temperature, volt-
age, and horizontal orientation as measured on a representative sample of drives.
2. Access to data = access time + latency time.
5.2.2 Format command execution time (minutes ) [1]
ST3300655LW
ST3300655LC
ST3146855LW
ST3146855LC
ST373455LW
ST373455LC
Maximum (with verify) 120 90 60
Maximum (no verify) 60 45 30
5.2.3 Generalized performance characteristics
Sustainable disc transfer rate:
Minimum [3] 73 Mbytes/sec
Maximum [3] 125 Mbytes/sec
SCSI interface data transfer rate (asynchronous):
Maximum instantaneous one byte wide 5.0 MBytes/sec [3]
Maximum instantaneous two bytes wide 10.0 MBytes/sec [3]
Synchronous transfer rate
In low voltage differential (LVD) interface mode 5.0 to 320 MBytes/sec
Sector Sizes:
Default 512 byte user data blocks
Variable 512 to 528 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
Negligible
the spare sectors per sparing zone reallocation scheme)
Average rotational latency 2.00 msec
Notes for Section 5.2.
[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] Assumes no errors and no sector has been relocated.
[3] Assumes system ability to support the rates listed and no cable loss.
Cheetah 15K.5 SCSI Product Manual, Rev. J 11
5.3 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 commands over the SCSI interface in less than 3 seconds after application of power. Stop time is 30 seconds 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 20 seconds typically (excluding an error
recovery procedure). The Motor Start Command can also be used to command the drive to stop the spindle
(see the SCSI Commands Reference Manual).
There is no power control switch on the drive.
5.4 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 the SCSI Interface Product Manual).
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 feature overlaps
cache operation somewhat as is noted in Section 5.5.1 and Section 5.5.2.
All default cache and prefetch Mode parameter values (Mode Page 08h) for standard OEM versions of this
drive family are given in Table 10.
5.5 Cache operation
Note. Refer to the SCSI Interface Manual for more detail concerning the cache bits.
Of the 16 Mbytes physical buffer space in the drive, approximately 13,000 kbytes can be used as a cache. The
buffer is divided into logical segments from which data is read and to which data is written.
The drive keeps track of the logical block addresses of the data stored in each segment of the buffer. If the
cache is enabled (see RCD bit in the SCSI Interface Manual ), data requested by the host with a read com-
mand is retrieved from the buffer, if possible, before any disc access is initiated. If cache operation is not
enabled, the buffer 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. All data transfers to the host are in accordance with buffer-full
ratio rules. See the explanation provided with the information about Mode Page 02h (disconnect/reconnect
control) in the SCSI Interface Manual.
The following is a simplified description of the prefetch/cache operation:
Case A—read command is received and all of the requested logical blocks are already in the cache:
1. Drive transfers the requested logical blocks to the initiator.
Case B—A Read command requests data, and at least one requested logical block is not in any segment of
the cache:
1. The drive fetches the requested logical blocks from the di sc and transfers them into a se gment, and then
from there to the host in accordance with the Mode Select Disconnect/Reconnect parameters, page 02h.
2. If the prefetch feature is enabled, refer to section 5.5.2 for operation from this point.
12 Cheetah 15K.5 SCSI Product Manual, Rev. J
Each cache segment is actually a self-contained circular buffer whose length is an integer number of logical
blocks. The drive dynamically creates and removes segments based on the workload. The wrap-around capability of the individual segments greatly enhances the cache’s overall performance.
Note. The size of each segment is not reported by Mode Sense command page 08h, bytes 14 and 15.
The value 0XFFFF is always reported regardless of the actual size of the segment. Sending a size
specification using the Mode Select command (bytes 14 and 15) does not set up a new segment
size. 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 an unchangeable parameter.
5.5.1 Caching write data
Write caching is a write operation by the drive that make s use of a drive b uffer storage area wher e the da ta to
be written to the medium is stored 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 available 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 th e 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 exceed the size of the segme nt 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 da ta 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 generated.
The Synchronize Cache command may be used to force the drive to write all cached write dat a to the med ium.
Upon completion of a Synchronize Cache command, all data received from previous write commands will have
been written to the medium.
Tables 10, 11 and 12 show the mode default settings for the drive.
5.5.2 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 are 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 pr ef etch operation uses the buffer as a cache, finding the requested data in
the buffer is a prefetch hit, not a cache operation hit.
To enable Prefetch, use Mode Select page 08h, byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0
enables prefetch.
The drive does not use the Max Prefetch field (bytes 8 and 9) or the Prefetch Ceiling field (bytes 10 and 11).
When prefetch (read look-ahead) is enabled (enabled by DRA = 0), the drive enables prefetch of contiguous
blocks from the disc when it senses that a prefetch hit will likely occur. The drive disables prefetch when it
decides that a prefetch hit is not likely to occur.
Cheetah 15K.5 SCSI Product Manual, Rev. J 13
6.0 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 9.4).
Seek Errors
Less than 10 in 10
Read Error Rates [1]
Recovered Data
Unrecovered Data
Miscorrected Data
Less than 10 errors in 10
Less than 1 sector in 10
Less than 1 sector in 10
Annualized Failure Rate (AFR) 0.62%
Preventive Maintenance None required
Note.
[1] Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.
6.1 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 7.2).
• Errors caused by host system failures are excluded from error rate computations.
• Assume random data.
• Default OEM error recovery settings are applied. This includes AWRE, ARRE, full read retries, full write
retries and full retry time.
8
seeks
12
bits transferred (OEM default settings)
16
bits transferred (OEM default settings)
21
bits transferred
6.1.1 Recoverable Errors
Recoverable errors are those detected and correcte d by the drive, and do not require user intervention.
Recoverable Data errors will use correction, although ECC on-the-fly is not considered for purposes of recov-
ered error specifications.
Recovered Data error rate is determined using read bits transferred for recoverab le errors occurring during a
read, and using write bits transferred for recoverable err ors occurring during a write.
6.1.2 Unrecoverable Error
Unrecoverable Data Errors (Sense Key = 03h) are specified at less than 1 sector in error per 1016 bits transferred. Unrecoverable Data Errors resulting from the same cause are treated as 1 error for that block.
14 Cheetah 15K.5 SCSI Product Manual, Rev. J
6.1.3 Seek errors
A seek error is defined as a failure of the drive to position the heads to the addressed track. After detecting an
initial seek error, the drive automatically performs an error recovery process. If the error recovery process fails,
a seek positioning error (Error code = 15h or 02h) will be reported with a Hardware error (04h) in the Sense
Key. Recoverable seek errors are specified at Less than 10 errors in 10
8
seeks. Unrecoverable seek errors
(Sense Key = 04h) are classified as drive failures.
6.2 Reliability and service
You can enhance the reliability of Cheetah 15K.5 SCSI disc drives by ensuring that the drive receives adequate cooling. Section 7.0 provides temperature measurements and other information that may be used to
enhance the service life of the drive. Section 9.3 provides recommended air-flow information.
6.2.1 Annualized Failure Rate (AFR) and Mean Time Between Failures (MTBF)
These drives shall achieve an AFR of 0.62% (MTBF o f 1,400,000 hours) when operat ed in an environment th at
ensures the HDA case temperatures do not exceed the values specified in Section 7.4.1.
Operation at case temperatures outside the specifications in Section 7.4.1 may increase the AFR (dec rease
the MTBF). AFR and MTBF statistics are population statistics that are not relevant to individual units.
AFR and MTBF specifications are based on the following assumptions for Enterprise Storage System environments:
• 8,760 power-on hours per year
• 250 average on/off cycles per year
• Operating at nominal voltages
• System provides adequate cooling to ensure the case temperatures specified in Section 7.4.1 are not
exceeded.
6.2.2 Preventive maintenance
No routine scheduled preventive maintenance shall be required.
Cheetah 15K.5 SCSI Product Manual, Rev. J 15
6.2.3 Hot plugging Cheetah 15K.5 SCSI disc drives
The ANSI SPI-4 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 Cheetah 15K.5 SCSI disc drives support all four hot plugging cases. Provision shall be made by the
system 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 SFF-8451 Specification for SCA-2 Unshielded
Connections).
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 co nn ec t/d isc on ne ct ope ra tio n.
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-4 standard.
If the device being hot plugged uses single-ended (SE) drive rs and the bus is currently operating in low vo ltag e
differential (LVD) mode, then all I/O processes for all devices on the bus must be co mpleted, an d the bus qu iesced, 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-4).
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 requi rement is met. During drive insertion,
care should be taken to avoi d exceeding the lim it s st ated in Se ction 7.4.4, "Shock a nd vibration" in this m anual.
6.2.4 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 drive degradation 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 instanta-
neous drive failures.
Each attribute monitors a specific set of conditions in the operating performance of the drive, and the thresholds are optimized to minimize “false” predictio ns .
16 Cheetah 15K.5 SCSI Product Manual, Rev. J
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.
The process of measuring off-line attributes and saving data can be forced by the Rezero Unit 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 tim e remaining before the next schedu led measurement 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, forcing 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 predictive 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 th e disc is uninterruptable and
the maximum delay is summarized below::
Maximum processing delay
S.M.A.R.T. delay times
On-line only delay
DEXCPT = 0, PERF = 1
42 milliseconds
Fully-enabled delay
DEXCPT = 0, PERF = 0
163 milliseconds
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 number of total operations for a given attribute. The interval defines the number of operations over which to measure 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 rat es 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 firmware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accomplish this, a counter is increm ented whenever th e error rate is unacceptable and decremented (not to exceed
Cheetah 15K.5 SCSI Product Manual, Rev. J 17
zero) whenever the error rate is acceptable. This counter is referred to as the Failure History Counter. There is
a separate Failure History Counter for each attribute. Should the counter continually be incremented such that
it reaches the predictive threshold, a predictive failure is signaled.
6.2.5 Thermal monitor
Cheetah 15K.5 SCSI drives implement a temperature warning system which:
1. Signals the host if the temperature exceeds a value which would threaten the drive.
2. Signals the host if the temperature exceeds a user-specified value.
3. Saves a S.M.A.R.T. data frame on the drive which exceed the threatening temper at ur e va lue .
A temperature sensor monitors the drive temperature and issues a warning over the interface when the tem-
perature exceeds a set th reshold. The t emperature is measured a t power-up an d then at te n-minute interv als
after power-up.
The thermal monitor system generates a warning code of 01-0B01 when the temperature exceeds the specified limit in compliance with the SCSI standard. The drive temperature is reported in the FRU code field of
mode sense data. You can use this information to determine if the warning is due to the temperature exceeding
the drive threatening temperature or the user-specified temperature.
This feature is controlled by the Enable Warning (EWasc) bit, and the reporting mechanism is controlled by the
Method of Reporting Informational Exceptions field (MRIE) on the Informational Exceptions Control (IEC)
mode page (1Ch).
The current algorithm implem ents two temperature trip points. The first trip point is set at 68°C which is the
maximum temperature limit according to the drive specification. The second trip point is user-selectable using
the Log Select command. The reference temperature parameter in the temperature log page (see Table 2) can
be used to set this trip point. The default value for this drive is 68°C, however, you can set it to any value in the
range of 0 to 68°C. If you specify a temper ature greater than 68°C in this field, the temperature is rounded
down to 68°C. A sense code is sent to the host to indicate the rounding of the parameter field.
Table 2: T emperature Log page (0Dh)
Parameter Code Description
0000h
0001h
Primary Temperature
Reference Temperature
When the first temperature trip point is exceeded, S.M.A.R.T. data is collected and a frame is saved to the disc.
6.2.6 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.
There are two test coverage options implemented in DST:
1. Extended test
2. Short text
The most thorough option is the extended test that performs various tests on the d riv e a nd sca ns ev er y lo gic al
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.
18 Cheetah 15K.5 SCSI Product Manual, Rev. J
6.2.6.1 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.
6.2.6.2 Implementation
This section provides all of the information necessary to implement the DST function on this drive.
6.2.6.2.1 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.
6.2.6.2.2 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, a nd 7. Refer to the SCSI Commands Refere nce Manual,
part number 100293068, for additional information about invoking DST.
6.2.6.2.3 Short and extended tests
DST has two testing options:
1. short
2. extended
These testing 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.
Cheetah 15K.5 SCSI Product Manual, Rev. J 19
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 componen ts. 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.
6.2.6.2.4 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 b eginning of the self- test result s log parame ter section of the
log page. Existing data will be moved to make room for the new parameter block. The drive reports 20 parameter 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-
Te st 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. Th e se lf- te st r esults 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.
6.2.6.2.5 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).
6.2.7 Product warranty
Beginning on the date of shipment to customer and co ntin uing for a period of five years, Seagate warrants that
each product (including components and subassemblies) or sp are p art that fails to fu nction proper ly under normal use due to defect in materials on 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 customer’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.
20 Cheetah 15K.5 SCSI Product Manual, Rev. J
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 container voids the drive warranty.
Seagate repair centers may refuse receipt of components improperly packaged or obviously damaged in transit. 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.
Cheetah 15K.5 SCSI Product Manual, Rev. J 21
7.0 Physical/electrical specifications
This section provides information relating to the physical and electrical characteristics of the Cheetah 15K.5
SCSI drive.
7.1 AC power requirements
None.
7.2 DC power requirements
The voltage and current requirement s for a sing le drive are shown in the following t able. Values indicated apply
at the drive power connector. The tables show current values in Amperes.
Table 3: ST3300655LC DC power requirements
Notes
LVD mode
Voltage +5 V +12 V
Regulation [5] ±5% ±5% [2]
Average idle current DC X [1][6] 0.70 0.80
Maximum starting current
(peak DC) DC
(peak AC) AC
Delayed motor start (max) DC
3σ
3σ
3σ
[3]
[3]
0.76
1.07
1.94
3.35
[1] [4] 0.57 0.03
Peak operating current
DC
Maximum DC
Maximum (peak) DC
X
3σ
3σ
[1]
[1]
0.69
0.70
1.38
1.18
1.23
2.90
22 Cheetah 15K.5 SCSI Product Manual, Rev. J
Table 4: ST3146855LC DC power requirements
Notes
LVD mode
Voltage +5 V +12 V
Regulation [5] ±5% ±5% [2]
Average idle current DC X [1][6] 0.71 0.57
Maximum starting current
(peak DC) DC
(peak AC) AC
Delayed motor start (max) DC
3σ
3σ
3σ
[3]
[3]
0.74
1.04
1.94
3.32
[1] [4] 0.56 0.03
Peak operating current
DC
Maximum DC
Maximum (peak) DC
X
3σ
3σ
[1]
[1]
0.67
0.68
1.42
0.88
0.94
2.50
Table 5: ST373455LC DC power requirements
Notes
LVD mode
Voltage +5 V +12 V
Regulation [5] ±5% ±5% [2]
Average idle current DC X [1][6] 0.69 0.42
Maximum starting current
(peak DC) DC
(peak AC) AC
Delayed motor start (max) DC
3σ
3σ
3σ
[3]
[3]
0.72
1.00
1.94
3.32
[1] [4] 0.56 0.03
Peak operating current
DC
Maximum DC
Maximum (peak) DC
X
3σ
3σ
[1]
[1]
0.67
0.68
1.40
0.78
0.82
2.38
[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 drives tested = 6, 35 Degrees C
ambient.
[2] For +12 V, a –10% tolerance is perm issible during initial start of spindle, and mu st return to ±5% before
15,000 rpm is reached. The ±5% must be maintained after the drive signifies that its power-up sequenc e
has been completed and that the drive is able to accept selection by the host initiator.
[3] See +12 V current profile in Figure 1.
[4] This condition occurs when the M otor Start Option is enabled and the drive has not yet received a Start
Motor command.
[5] See Section 7.2.1 “Conducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,
and transient response.
[6] During idle, the drive heads are relocated every 60 seconds to a random location within the band from
three-quarters to maximum track.
General Notes for Tables 3, 4, and 5:
1. Minimum current loading for each supply voltage is not less than 1.2% of the maximum operating cu rrent
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
Cheetah 15K.5 SCSI Product Manual, Rev. J 23
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.
7.2.1 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
connector.
+5 V = 250 mV pp from 0 to 100 kHz to 20 MHz.
+12 V = 800 mV pp from 100 Hz to 8 KHz.
450 mV pp from 8 KHz to 20 KHz.
250 mV pp from 20 KHz to 5 MHz.
7.2.2 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 supplied to 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 S tart op tion and disa ble the Enable Moto r Start option on the J6 connector on LW models or on the backplane for LC models. See Section 9.1 for pin selection information. To delay the motor until
the drive receives a Start Unit comman d, enable the Ena ble Remote Motor Start option on the J6 connector on
LW models or on the backplane for LC models.
7.2.3 Current profile
Figures 1 and 2 show +5V and +12V sample current profiles for the ST3300655LC model.
All times and currents are typical. See Table 3 for maximum current requirements.
24 Cheetah 15K.5 SCSI Product Manual, Rev. J
Figure 1. Typical ST3300655LW drive +12V LVD current profile
Figure 2. Typical ST3300655LW drive +5 V LVD current profile
Cheetah 15K.5 SCSI Product Manual, Rev. J 25
7.3 Power dissipation
ST3300655LW/ST3300655LC
For drives using low voltage differential interface circuit s, typical power dissipation under idle conditions is 13.1
watts (44.70 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
3). Locate the typical I/O rate for a drive in y our 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.
1.8 00
1.6 00
)
ST3300655LC CURRENT/POWER vs THROUGHPUT (SCSI - LVD)
Random 8 Block Reads
18 . 00
16 . 00
5Volt A
12 V o l t A
Watts
1.4 00
1.2 00
1.0 00
0.800
Amperes
0.600
0.400
0.200
0.000
0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0
I/Os per Second
Figure 3. ST3300655LC DC current and power vs. IOPS (LVD)
14 . 00
12 . 00
10 . 00
8.00
6.00
4.00
2.00
0.00
Power (watts)
26 Cheetah 15K.5 SCSI Product Manual, Rev. J
ST3146855LW/ST3146855LC
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is
10.39 watts (35.45 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 y our 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.
ST3146855LC CURRENT/POWER vs THROUGHPUT (SCSI - LVD)
Random 8 Block Reads
1.8 00
1.6 00
18 . 00
16 . 00
5Volt A
12 V o l t A
Watts
1.4 00
1.2 00
1.0 00
0.800
Amperes
0.600
0.400
0.200
0.000
0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0
I/Os per Second
Figure 4. ST3146855LC DC current and power vs. IOPS (LVD)
14 . 00
12 . 00
10 . 00
8.00
6.00
4.00
2.00
0.00
Power (watts)
Cheetah 15K.5 SCSI Product Manual, Rev. J 27
ST373455LW/ST373455LC
For drives using low voltage differential interface circuit s, typical power dissipation under idle conditions is 8.49
watts (28.97 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
5). Locate the typical I/O rate for a drive in y our 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.
ST373455LC CURRENT/POWER vs THROUGHPUT (SCSI - LVD)
Random 8 Block Reads
1.8 00
1.6 00
18 . 00
16 . 00
5Volt A
12 Volt A
Watts
1.4 00
1.2 00
1.0 00
0.800
Amperes
0.600
0.400
0.200
0.000
0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0
I/Os per Second
Figure 5. ST373455LC DC current and power vs. IOPS (LVD)
14 . 00
12 . 00
10 . 00
8.00
6.00
4.00
2.00
0.00
Power (watts)
28 Cheetah 15K.5 SCSI Product Manual, Rev. J
7.4 Environmental limits
Te mperature 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 82°F (28°C).
7.4.1 Temperature
a. Operating
The maximum allowable continuous or sustained HDA case temperature for the rated Annualized Failure
Rate (AFR) is 122°F (50°C). The maximum allowable HDA case temperature is 60°C. Occasional excur
sions of HDA case temperatures above 122°F (50°C) or below 41°F (5°C) may occur without impact to
specified AFR. Continual or sustained operation at HDA case temperatures outside these limits may
degrade AFR.
Provided the HDA case temperatures limits are met, 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. Air flow m ay be needed in th e drive enclosure to keep within this range (see Section 8.3). Operation at
HDA case temperatures outside this range may adversely affect the drives ability to meet specifications. To
confirm that the required cooling for the electronics and HDA case is provided, place the drive in its final
mechanical configuration, perform random write/read operations and measure the HDA case temperature
after it has stabilized.
b. Non-operating
–40° to 158°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 cont ainer designed by Seagate for use with
drive.
-
HDA Temp.
Check Point
Figure 6. Locations of the HDA temperature check point
1.0"
.5"
7.4.2 Relative humidity
The values below assume that no condensation on the drive occurs.
a. Operating
5% to 95% non-condensing relative humidity with a maximum gradient of 10% per hour.
b. Non-operating
5% to 95% non-condensing relative humidity with a maximum gradient of 20% per hour.
7.4.3 Effective altitude (sea level)
a. Operating
–1,000 to +10,000 feet (–305 to +3,048 meters)
Cheetah 15K.5 SCSI Product Manual, Rev. J 29
b. Non-operating
–1,000 to +40,000 feet (–305 to +12,210 meters)
7.4.4 Shock and vibration
Shock and vibration limits specified in this document are measured direc tly on the drive chassis. If the drive is
installed in an enclosure to which the stated shock and/or vibration criteria is applied, resona nces 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 restric tions of Section 9.4. Orientation of the
side nearest the LED may be up or down.
7.4.4.1 Shock
a. Operating—normal
The drive, as installed for normal operation, shall oper ate error free while subjected to intermittent shock not
exceeding 15 Gs at a maximum duration of 11 msec (half sinewave). The drive, as installed for normal
operation, shall operate error free while subjected to intermittent shock not exceeding 60 Gs at a maximum
duration of 2 msec (half sinewave). Shock may be applied in the X, Y, or Z axis.
b. Operating—abnormal
Equipment, as installed for normal operation, does not incur physical damage while subjected to intermittent shock not exceeding 40 Gs at a maximum duration of 11 msec (half sine wave). Shock occurring at
abnormal levels may promote degraded operational performa nce during the abnormal shock period. Speci
fied operational performance will continue when normal operating shock levels resume. Shock may be
applied in the X, Y, or Z axis. Shock is not to be repeated more than two times per second.
c. 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 nonrepetitive shock not exceeding 75 Gs at a maximum duration of 11 msec (half
sinewave) shall not exhibit device damage or performance degradation. Shock may be applied in the X, Y,
or Z axis.
The drive subjected to nonrepetitive shock not exceeding 250 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 nonrepetitive shock not exceeding 120 Gs at a maximum duration of 0.5 msec (half
sinewave) does not exhibit device damage or performance degradation. Shock may be applied in the X, Y,
or Z axis.
d. 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 he ight
<600 cu in (<9,800 cu cm) Any 60 in (1524 mm)
600-1800 cu in (9,800-19,700 cu cm) 0-20 lb (0 to 9.1 kg) 48 in (1219 mm)
>1800 cu in (>19,700 cu cm) 0-20 lb (0 to 9.1 kg ) 42 in (1067 mm)
>600 cu in (>9,800 cu cm) 20-40 lb (9.1 to 18.1 kg) 36 in (914 mm)
30 Cheetah 15K.5 SCSI Product Manual, Rev. J
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.
Z
Y
X
Figure 7. Recommended mounting
X
Z
Y
Cheetah 15K.5 SCSI Product Manual, Rev. J 31
7.4.4.2 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
10–500 Hz @ 0.5 G (zero to peak)
Vibration may be applied in the X, Y, or Z axis.
Operating normal translational random flat profile:
10–500 Hz 0.4 gRMS
b. Operating—abnormal
Equipment as installed for normal operation shall not incur physical damage while subjected to periodic
vibration not exceeding:
15 minutes of duration at major resonant frequency
10–500 Hz @ 0.75 G (X, Y, or Z axis, zero to peak)
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.
Operating abnormal translational random flat profile
10 - 500 Hz 1.2 gRMS
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
Vibration may be applied in the X, Y, or Z axis.
Non-operating translational random flat profile:
5–22 Hz @ 0.040 inches (1.02 mm) displacement (zero to peak)
22–500 Hz @ 2.00 G (zero to peak)
10–500 Hz 1.2 gRMS
7.4.5 Air cleanliness
The drive is designed to operate in a typical office environment with minimal environmental control.
7.4.6 Corrosive environment
Seagate electronic drive components pass accelerated corrosion testing equivalent to 10 years exposure to
light industrial environments containing sulfurous gases, chlorine and nitric oxide, classes G and H per ASTM
B845. However, this accelerated testing cannot duplicate every potential application environment.
Users should use caution exposin g any electronic c omponents to uncontrolled chemical pollutants and corrosive chemicals as electronic drive component reliability can be affected by the installation environment. The silver, copper, nickel and gold films used in Seagate products are especially sensitive to the presence of sulfide,
chloride, and nitrate contaminants. Sulfur is found to be th e most damaging . In addition, electro nic component s
should never be exposed to condensing water on the surface of the printed circuit board assembly (PCBA) or
exposed to an ambient relative humidity greater than 95%. Materials used in cabinet fabrication , such as vulcanized rubber, that can outgas corrosive compounds should be minimized or eliminated. The useful life of any
electronic equipment may be extended by replacing materials near circuitry with sulfide-free alternatives.
32 Cheetah 15K.5 SCSI Product Manual, Rev. J
7.4.7 Acoustics
Sound power during idle mode shall be 3.7 bels typical when measured to ISO 7779 specification. Sound
power while operating shall be 4.3 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 measured according to Seagate specification 30553-001. There will not be any tones more than 24 dB above the
masking noise on any drive.
7.4.8 Electromagnetic susceptibility
See Section 3.1.2.
7.5 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
dimensions. See Section 9.4, “Drive mounting.”
Height (max): 1.028 in. 26.11 mm
Width (max): 4.010 in. 101.85 mm
Depth (max): 5.787 in. 146.99 mm
Weight (max): 1.85 pounds 0.839 kilograms
K
REF
S
-Z-T//
[1]
H
L
B
-Z-
J
R REF
A
-ZM
-X-U
P
F
[1]
E
C
-X-
D
V
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
0.12 in. (3.05 mm).
Figure 8. LW mounting configuration dimensions
A
1.028
B
5.787
C
4.000
D
3.750
E
.125
F
1.750
H
1.122
J
4.000
K
.250
L
1.638
M
.181
P
1.625
R
1.816
S
.315
T
.015
U
.015
V
.265
Dimension Table
Inches
max
max
± .010
± .010
± .010
± .010
± .020
± .010
± .010
± .010
± .020
± .020
max
max
± .010
26.10
147.00
101.60
95.25
44.45
28.50
101.60
41.60
41.28
46.13
Millimeters
max
max
± .25
± .25
3.18
± .25
± .25
± .50
± .25
6.35
± .25
± .25
4.60
± .50
± .50
8.00
0.38
max
0.38
max
6.73
± .25
Cheetah 15K.5 SCSI Product Manual, Rev. J 33
-X-U
-Z-
K
REF
S
-Z-T//
A
M
P
F
[1]
[1]
H
L
R REF
-Z- -X-N
C
-X-
J
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
0.12 in. (3.05 mm).
1.028
A
5.787
B
4.000
C
3.750
D
.125
E
1.750
F
1.122
H
4.000
J
.250
K
1.638
L
.181
M
.040
N
1.625
P
2.618
R
.276
S
.015
T
.015
U
-Z-
Dimension Table
Inches
max
max
± .010
± .010
± .010
± .010
± .020
± .010
± .010
± .010
± .020
max
max
26.10
147.00
101.60
95.25
44.45
28.50
101.60
41.60
41.28
66.50
Millimeters
max
max
± .25
± .25
± .25
3.18
± .25
± .50
± .25
± .25
6.35
± .25
4.60
1.02
± .50
7.00
max
0.38
max
0.38
E
D
Figure 9. LC mounting configuration dimensions
34 Cheetah 15K.5 SCSI Product Manual, Rev. J
8.0 Defect and error management
Seagate continues to use innovative technologies to manage defects and errors. These technologies are
designed to increase data integrity, perform drive self-maintenance, and validate proper drive operation.
SCSI defect and error management involves drive internal defect/error management and SCSI system error
considerations (errors in communications between the initiator and the drive). In addition, Seagate provides
the following technologies used to increase data integrity and drive reliability:
• Background Media Scan (see Section 8.4)
• Media Pre-Scan (see Section 8.5)
• Deferred Auto-Reallocation (see Section 8.6)
• Idle Read After Write (see Section 8.7)
The read error rates and specified storage capacities are not dependent on host (initiator) defect management
routines.
8.1 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 d rive 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 liste d 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 initiat or using the
Read Defect Data command (see the SCSI Commands Reference Manual).
8.2 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 previously 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 additional information on this, refer to the Error Recovery Page table in the SCSI Commands Reference 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 5 levels for writes.
Cheetah 15K.5 SCSI Product Manual, Rev. J 35
Ta ble 6 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 T ime 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 erro r 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.”
Table 6: Read and write retry count maximum recovery times [1]
Read retry
count [1]
0 51.87 0 23.94
1 59.85 1 35.91
2 203.49 2 55.86
3 219.45 3 67.83
4 253.11 4 119.79
5 279.35 5 (default) 147.72
6311.27
7395.12
8463.12
9495.04
10 530.95
11 (default) 1,282.97
Maximum recovery time per LBA
(cumulative, msec)
Write retry
count
Maximum recovery time per LBA
(cumulative, msec)
[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 253.11 msec recovery time for each of the four LBAs in
the command. If the recovery time limit is set to 00 C8 he x (200 mse c de cimal) a four LBA r ead comman d
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 exec uting error recovery and it restarts on each command.
Therefore, each command’s tot a l re co very time is sub j ect 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.
36 Cheetah 15K.5 SCSI Product Manual, Rev. J
8.3 SCSI systems errors
Information on the reporting of operational errors or faults across the interface is given in the SCSI Interface
Product Manual. 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 Diagnostic Results reports the
results of diagnostic operations performed by the drive.
Status returned by the drive to the Initiator is described in the SCSI Commands Reference 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.
8.4 Background Media Scan
Background Media Scan (BMS) is a self-initiated media scan. BMS is defined in the T10 document SPC-4
available from the T10 committee. BMS performs sequential reads across the entire pack of the media while
the drive is idle. In RAID arrays, BMS allows hot spare drives to be scann ed for defects prior to being pu t into
service by the host system. On regular duty drives, if the host system makes use of the BMS Log Page, it can
avoid placing data in suspect locations on the media. Unreadable and recovered error sites will be logged or
reallocated per ARRE/AWRE settings.
With BMS, the host system can consume less power and system overhead by only checking BMS status and
results rather than tying up the bus and consuming power in the process of host-i nitiated media scan ning activity.
Since the background scan functions are only done dur ing idle periods, BMS ca uses a negligible imp act to system performance. The first BMS scan for a newly manufactured drive is performed as quickly as possible to
verify the media and protect data by setting the “Start time after idle” to 5ms, all subsequent scans begin after
500ms of idle time. Other features that normally use idle time to function will function normally because BMS
functions for bursts of 800ms and then suspends activity for 100ms to allow other background functions to
operate.
BMS interrupts immediately to service host commands from the interface bus while performing reads. BMS will
complete any BMS-initiated error recovery prior to returning to service host-initiated commands. Overhead
associated with a return to host-servicing activity from BMS only impacts the first command that interrupted
BMS, this results in a typical delay of about 1 ms.
8.5 Media Pre-Scan
Media Pre-Scan is a feature that allows the drive to repair media errors that would otherwise have been found
by the host system during critical data accesses early in the drive’s life. The default setting for Media Pre-Scan
is enabled on standard products. Media Pre-Scan checks each write command to determine if the destination
LBAs have been scanned by BMS. If the LBAs have been verified, the drive proceeds with the normal write
command. If the LBAs have not been verified by BMS, Pre-Scan will convert the write to a write verify to certify
that the data was properly written to the disc.
Note. During Pre-Scan write verify commands, write performance may decrease by 50% until Pre-Scan
completes. Write performance testing shou ld be performed after Pre-Scan is complete. Th is may
be checked by reading the BMS status.
To expedite the scan of the full pack and subsequently exit from the Pre-Scan period, BMS will begin scanning
immediately when the drive goes to idle during the Pre-Scan period. In the event that the drive is in a high
transaction traffic environment and is unable to complete a BMS scan within 24 power on hours BMS will disable Pre-Scan to restore full performance to the system.
Cheetah 15K.5 SCSI Product Manual, Rev. J 37
8.6 Deferred Auto-Reallocation
Deferred Auto-Reallocation (DAR) simplifies reallocation algorithms at the system level by allowing the drive to
reallocate unreadable locations on a subsequent write command. Sites are marked for DAR during read operations performed by the drive. When a write command is received for an LBA marked for DAR, the auto-reallocation process is invoked and attempts to rewrite the data to the original location. If a verification of this rewrite
fails, the sector is re-mapped to a spare location.
This is in contrast to the system having to use the Reassign Command to reassign a location that was unreadable and then generate a write command to rewrite the data. DAR is most effective when AWRE and ARRE
are enabled—this is the default setting from the Seagate factory. With AWRE and ARRE disabled DAR is
unable to reallocate the failing location and will report an error sense code indicating that a write command is
being attempted to a previously failing location.
8.7 Idle Read After Write
Idle Read After Write (IRAW) utilizes idle time to verify the integrity of recently written data. During idle periods,
no active system requests, the drive reads recently written data from the media and compares it to valid write
command data resident in the drives data buffer. An y sectors that fail the comparison result in the invocation of
a rewrite and auto-reallocation process. The process attempts to rewrite the data to the original location. If a
verification of this rewrite fails, the sector is re-mapped to a spare location.
38 Cheetah 15K.5 SCSI Product Manual, Rev. J
9.0 Installation
Note. These drives are designed to be used only on single-ended (SE) or low voltage differential (LVD)
busses. Do not install these drives on a high voltage differ ential (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 J5 connector (see Figure 10), or via the drive to host
I/O signals on the LC model. Some users connect cables to J5 and perform the set-up using remote switches.
Configure drive options
For option jumper locations and definitions refer to Figures 10 and 11. Drive default mode parameters are not
normally needed for installation. Refer to Section 10.3.2 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 integrator, or host eq uipment manufacturer must provide external terminators.
Note. For additional information about terminator requirements, refer to Sections 10.8 and 10.9.
• 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 a dditionally purchased drive
installation software. If necessary see Section 10 for Seagate suppor t ser vice s te lep hon e nu m be rs .
• 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
• Drives are shipped from the factory low level formatted with 512 byte sectors.
9.1 Drive ID/option select header
Figure 10 shows the drive ID select jumper connector. Figure 11 shows the option select jumper connector for
all models. Figure 11 shows the drive’s J6 jumper connector. The notes following the figures describe the functions of the various jumper positions on the connectors. Suggested part number for the jumpers used on J6 is
Molex 52747-0211 (Seagate part number 77679052). A bag with the two jumper plug types is shipped with the
standard OEM drives.
Cheetah 15K.5 SCSI Product Manual, Rev. J 39
Drive HDA (rear view, PCB facing downward)
68 Pin
SCSI I/O Connector
J1
[4]
Pin 1
+5V Ground
Pin 1
[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
J5
A3A2A
1197531
Host
Alternate
Usage Plug
Reserved
N.C.
[4]
12 10 8 6 4 2
+5V
+5V
Dashed area is optional host circuitry (external to the
drive) connected to host supplied optional usage plug.
N.C.
Ground
Drive Activity LED
A
1
0
A0A1A2A
3
[1] [2]
1P2P3P4P
J1-DC Power
PCB
For ID selection use
jumpers as shown or
connect a cable for
remote switching as
shown below.
Pins 1, 3, 5, and 7 are
optional connections to
switching circuits in host
equipment to establish
drive ID.
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.
Figure 10. J5 jumper header (on LW models only)
40 Cheetah 15K.5 SCSI Product Manual, Rev. J
Drive
Front
Jumper Plug
(enlarged to
show detail)
Term. Power to SCSI Bus
Parity Disable
Delay Motor Start
Enable Remote Motor Start
Write Protect
Force Single-ended Bus Mode
Reserved
Pin 1
[1] [5]
J6
T
P
D
M
P
W
S
S
E
D
P
E
Figure 11. J6 option select header (on LW models only)
9.1.1 Notes for Figures 10 and 11.
[1] Notes explaining the functions of the various jumpers on J5 and J6 jumper header connectors are given
here and in Section
9.1.2. 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 or J6. The J5 connector signals conform to SFF8009 Revision 2.0, Unitized Connector for Cabled Drives, signal assignments for auxiliary connectors.
[2] These signals are also on 80-pin J1 I/O connector. See tables 19 and 20, note 9.
[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, 11-12 or J6 pins 13-20.
[6] Conn ect an external Drive Activity LED to J5 pin 8 (see Figure 10) a nd the drive’s +5V power source,
through an appropriately sized curren t lim it i ng resis to r.
Cheetah 15K.5 SCSI Product Manual, Rev. J 41
9.1.2 Function description
J6
jumper
installation
Jumper function description
SE
On Forces drive to use single-ended I/O drivers/receivers only.
Off Drive can operate on the interface in low voltage differential mode or single-ended, depend-
ing on the voltage state of the I/O “DIFFSNS” line. Default is SE jumper not inst alled.
DS ME
Off Off Spindle starts immediately after power up - Default setting.
Off On Drive spindle does not start until Start Unit command received from host.
On Off Spindle Startup is delayed by SCSI ID times 12 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 Entire drive is write protected.
Off Drive is not write protected. Default is WP jumper not installed.
PD
On Parity checking and parity error reporting by the drive is disabled.
Off Drive checks for parity and reports result of parity checking to host.
Default is PD jumper not installed.
RES
Off Reserved jumper position. Default is no RES jumper installed.
TP
Off The drive does not supply terminator power to external terminators or to the SCSI bus I/O
cable.
On Drive supplies power to SCSI bus I/O cable. When drives have differential I/O circuits, a
jumper on the TP position may be needed to power external terminators (see system docu
mentation). These drives do not have terminator circuits on the drive.
Note. J6 does not exist on the LC model and is supported on the LW model only.
-
42 Cheetah 15K.5 SCSI Product Manual, Rev. J
9.2 Drive orientation
The balanced rotary arm actuator d esign of the d rive allows it to be mounted in a ny orient ation. All drive performance 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.
9.3 Cooling
The host enclosure must provide heat removal from the drive. You should confirm that the host enc losure is
designed to ensure that the drive operates within the temperature measurement guideline s described in Section 7.4.1. In some cases, forced airflow may be required to keep temperatures at or below the temperatures
specified in Section 7.4.1.
If forced air is necessary, possible air-flow patterns are shown in Figure 12. The air-flow patterns are created
by fans either forcing or drawing air as shown in the illustrations. Conduction, convection, or other forced airflow patterns are acceptable as long as the temperature measurement guidelines of Section 7.4.1 are met.
Note. Air flows in the direction shown (back to front)
or in reverse direction (front to back)
Note. Air flows in the direction shown or
in reverse direction (side to side)
Figure 12. Air flow (suggested)
Above unit
Under unit
Above unit
Under unit
Cheetah 15K.5 SCSI Product Manual, Rev. J 43
9.4 Drive mounting
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
stiffness is 80 lb/in (14.0 N/mm). The following equation and paragraph define the allowable mounting surface
stiffness:
k * x = F < 15lb = 67N
where ‘k’ represents the mounting surface stiffness (u nits 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
Technology that the drive can meet the shock and vibration specifications while mounted in such an
adapter frame. Adapter frames that are available may not have a mechanical structure capable of
mounting the drive so that it can meet the shock and vibration specifications listed in this manual.
9.5 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 electrically 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 mounting 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 Cheetah 15K.5 SCSI Product Manual, Rev. J
10.0 Interface requirements
This section partially describes the interface requirem e nts as implem en te d on the driv es .
10.1 General description
This section describes in essentially general terms the interface requirements supported by the Cheet a h 15K.5
SCSI. No attempt is made to describe all of the minute details of conditions and constraints that must be considered 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 Parallel SCSI Interface Manual and the SCSI
Commands Reference Manual .
10.2 SCSI interface messages supported
Table 7 lists the messages supporte d by the Cheetah 15K.5 SCSI family drives.
Table 7: SCSI messages supported by Cheetah 15K.5 SCSI family drives
Message name Message code
Abort 06h Y
Abort-tag 0Dh Y
Bus device reset 0Ch Y
Clear ACA 16h N
Clear queue 0Eh Y
Command complete 00h Y
Continue I/O process 12h N
Disconnect 04h Y
Extended messages 01h[1] Y
Identify 80h-FFh Y
Ignore wide residue (two bytes) 23h Y
Initiate recovery 0Fh N
Initiator detected error 05h Y
Linked command complete 0Ah Y
Linked command complete with flag 0Bh Y
Message parity error 09h Y
Message reject 07h Y
Modify data pointer [1] N
No operation 08h Y
Parallel Protocol Request [1] [2] Y
Queue tag messages (two bytes)
ACA 24h N
Head of queue tag 21h Y
Supported
(Y = yes)
(N = no)
Cheetah 15K.5 SCSI Product Manual, Rev. J 45
Table 7: SCSI messages supported by Cheetah 15K.5 SCSI family drives
Supported
(Y = yes)
Message name Message code
(N = no)
Ordered queue tag 22h Y
Simple queue tag 20h Y
Quick Arbitration and Selection (QAS) 55h Y
Release recovery 10h N
Restore pointers 03h Y
Save data pointer 02h Y
Synchronous data transfer req. [1] Y
Target transfer disable 13h N
Terminate I/O process 11h N
Wide data transfer request [1] Y
Notes.
[1] Extended messages (see the SCSI Interface Product Manual).
[2] Supports all options except qas_req and iu_req.
10.3 SCSI interface commands supported
Table 8 following lists the SCSI interfac e commands that are supported by the drive.
OEM standard drives are shipped set to operate in Ultra320 mode.
Table 8: Commands supported by Cheetah 15K.5 SCSI family drive
Command name Command code Supported by SCSI-2/3
Change Definition 40h N
Compare 39h N
Copy 18h N
Copy and Veri fy 3Ah N
Format Unit [1] 04h Y
DPRY bit supported N
DCRT bit supported Y
STPF bit supported Y
IP bit supported Y
DSP bit supported Y
IMMED bit supported Y
VS (vendor specific) N
Inquiry 12h Y
Date Code page (C1h) Y
Device Behavior page (C3h) Y
Firmware Numbers page (C0h) Y
Implemented Operating Def page (81h) Y
Jumper Settings page (C2h) Y
Supported Vital Product Data p age (00h) Y
Unit Serial Number page (80h) Y
46 Cheetah 15K.5 SCSI Product Manual, Rev. J
Table 8: Commands supported by Cheetah 15K.5 SCSI family drive (Continued)
Command name Command code Supported by SCSI-2/3
Lock-unlock cache 36h N
Log Select 4Ch Y
PCR bit Y
DU bit N
DS bit Y
TSD bit Y
ETC bit N
TMC bit N
LP bit N
Log Sense 4Dh Y
Application Client Log page (0Fh) Y
Background Medium Scan page (15h) Y
Buffer Over-run/Under-run page (01h) N
Cache Statistics page (37h) Y
Factory Log page (3Eh) Y
Last n Deferred Errors or Asynchronous Events page (0Bh) N
Last n Error Events page (07h) N
Non-medium Error page (06h) Y
Pages Supported list (00h) Y
Read Error Counter page (03h) Y
Read Reverse Error Counter page (04h) N
Self-test Results page (10h) Y
Start-stop Cycle Counter page (0Eh) Y
Temperature page (0Dh) Y
Verify Error Counter page (05h) Y
Write error counter page (02h) Y
Mode Select (same pages as Mode Sense 1Ah) 15h Y [2]
Mode Select (10) (same pages as Mode Sense 1Ah) 55h Y
Mode Sense 1Ah Y [2]
Caching Parameters page (08h) Y
Control Mode page (0Ah) Y
Disconnect/Reconnect (02h) Y
Error Recovery page (01h) Y
Format page (03h) Y
Information Exceptions Control page (1Ch) Y
Background Scan mode subpage (01h) Y
Notch and Partition Page (0Ch) N
Port Control Page (19h) Y
Power Condition page (1Ah) Y
Cheetah 15K.5 SCSI Product Manual, Rev. J 47
Table 8: Commands supported by Cheetah 15K.5 SCSI family drive (Continued)
Command name Command code Supported by SCSI-2/3
Rigid Disc Drive Geometry page (04h) Y
Unit Attention page (00h) Y
Verify Error Recovery page (07h) Y
Xor Control page (10h) N
Mode Sense (10) (same pages as Mode Sense 1Ah) 5Ah Y
Prefetch 34h N
Read 08h Y
Read Buffer (modes 0, 2, 3, Ah and Bh supported) 3Ch Y
Read Capacity 25h Y
Read Defect Data (10) 37h Y
Read Defect Data (12) B7h Y
Read Extended 28h Y
DPO bit supported Y
FUA bit supported Y
Read Long 3Eh Y
Reassign Blocks 07h Y
Receive Diagnostic Results 1Ch Y
Supported Diagnostics pages (00h) Y
Translate page (40h) Y
Release 17h Y
Release (10) 57h Y
Request Sense 03h Y
Actual Retry Count bytes Y
Extended Sense Y
Field Pointer bytes Y
Reserve 16h Y
3rd Party Reserve Y
Extent Reservation N
Reserve (10) 56h Y
3rd Party Reserve Y
Extent Reservation N
Rezero Unit 01h Y
Search Data Equal 31h N
Search Data High 30h N
Search Data Low 32h N
Seek 0Bh Y
Seek Extended 2Bh Y
Send Diagnostics 1Dh Y
Supported Diagnostics pages (00h) Y
48 Cheetah 15K.5 SCSI Product Manual, Rev. J
Table 8: Commands supported by Cheetah 15K.5 SCSI family drive (Continued)
Command name Command code Supported by SCSI-2/3
Translate page (40h) Y
Set Limits 33h N
Start Unit/Stop Unit (spindle ceases rotating) 1Bh Y
Synchronize Cache 35h Y
Test Unit Ready 00h Y
Verify 2Fh Y
BYTCHK bit Y
Write 0Ah Y
Write and Verify 2Eh Y
DPO bit Y
Write Buffer (modes 0, 2, supported) 3Bh Y
Firmware Download option
Y
(modes 5, 7, Ah and Bh supported) [3]
Write Extended 2Ah Y
DPO bit Y
FUA bit Y
Write Long 3Fh Y
Write Same 41h Y
PBdata N
LBdata N
XDRead 52h N
XDWrite 50h N
XPWrite 51h N
[1] The drive can format to any even number of bytes per sector from 512 to 528.
[2] Tables 10 show how individual bits are set and which are changeable by the host.
[3] WARNING: A power loss during flash programming can result in firmware corruption. This usually makes
the drive inoperable.
Cheetah 15K.5 SCSI Product Manual, Rev. J 49
Table 9 lists the Standard Inquiry command d at a th at the dr ive should r eturn to the initiator per the format give n
in the SCSI Interface Product Manual, part number 100293069, Inquiry command section.
Table 9: Cheetah 15K.5 SCSI family drive Standard Inquiry data
Bytes Data (HEX)
0-15 00 00 [03]1[12]28B 00 01 3E 53 45 41 47 41 54 45 20 VENDOR ID
16-31 53 54 [33] [33] [30] [30] [36] [35] [35] [4C] [57]
32-47 R# R# R# R# S# S# S# S# S# S# S# S# 00 00 00 00
48-63 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
64-79 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80-95 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
96-111 00 43 6F 70 79 72 69 67 68 74 20 28 63 29 20 [y] COPYRIGHT
4
112-127 [y] [y] [y]
128-143 72 69 67 68 74 73 20 72 65 73 65 72 76 65 64 20
20 53 65 61 67 61 74 65 20 41 6C 6C 20 NOTICE
3
20 20 20 20 20 PRODUCT ID
[ ]103 means SCSI-3 (Ultra160) implemented.
Note. Seagate has chosen to set this bit to 03, SCSI-3 (Ultra160) implemented, rather than 04, SCSI-4
(Ultra320) implemented, due to compatibility issues with some host bus adapters. This setting will
not affect the Ultra320 functionality of the drive.
[ ]2The drive can be changed between these two configurations:
02 means response data in SCSI-2/SCSI-3 format.
12 means the drive uses the hierarchical addre ssin g mo d e to as sig n LUN s to log ica l 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 ser vo RAM and ROM release num-
bers.
S# Eight ASCII digits representing the eight digits of the product serial number.
[ ]3Bytes 18 through 26 reflect model of drive. The table above shows the hex values for Model
ST3300655LW. Refer to the values below for the values of bytes 18 through 26 of you particular model:
ST3300655LW 333330303635354C57
ST3300655LC 33 33 30 30 36 35 35 4C 43
ST3146855LW 333135363835354C57
ST3146855LC 33 31 35 36 38 35 35 4C 43
ST373455LW 33 37 33 34 35 35 4C 57 20
ST373455LC 33 37 33 34 35 35 4C 43 20
[ ]4Copyright Year - the year the drive’s firmware code was built.
10.3.1 Inquiry Vital Product data
Instead of the standard Inquiry data shown in Table 9, the initiator can request several Vital Product Data
pages by setting the Inquiry command EVPD bit to one. The SCSI Commands Reference Manual 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.
50 Cheetah 15K.5 SCSI Product Manual, Rev. J
10.3.2 Mode Sense data
The Mode Sense command provides a means for the drive to report its oper ating parameters to the initiator.
The drive maintains four sets of Mode parameters, Default values, Saved values, Current values and Changeable 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 disc 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 va lues currently being used by the dr ive 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 10 refer to Mode page 01, in the row entitled “CHG”. These are
hex numbers representing the changeable values for mod e pag e 01. Note that bytes 04, 05 , 06, and 07 are n ot
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 fie ld, it means that bi t is not changeab le.
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 changeable.
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 fr om the
media and stores them to the current values storage in vo latile 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 status 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.
The following tables list the values of the data bytes returned by the d rive in response to the Mode Sense command pages for SCSI Ultra160 implementation (see the SCSI Commands Reference Manual).
Definitions:
SAV = Current saved value.
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.
Cheetah 15K.5 SCSI Product Manual, Rev. J 51
Table 10: ST3300655 Mode sense data
MODE SENSE HEADER DATA
ab 00 10 08 22 ec b2 5c 00 00 02 00
MODE SENSE PAGES DATA
SAV 81 0a c0 0b ff 00 00 00 05 00 ff ff
DEF 81 0a c0 0b ff 00 00 00 05 00 ff ff
CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff
SAV 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00
DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 87 00 00 00
SAV 83 16 68 58 00 00 00 38 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00
DEF 83 16 68 58 00 00 00 38 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00
CHG 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 84 16 01 22 64 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
DEF 84 16 01 22 64 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
CHG 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 87 0a 00 0b ff 00 00 00 00 00 ff ff
DEF 87 0a 00 0b ff 00 00 00 00 00 ff ff
CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff
SAV 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00
CHG 88 12 a5 00 00 00 ff ff ff ff 00 00 20 00 00 00 00 00 00 00
SAV 8a 0a 02 00 00 00 00 00 00 00 0f 0c
DEF 8a 0a 02 00 00 00 00 00 00 00 0f 0c
CHG 8a 0a 03 f0 00 00 00 00 00 00 00 00
SAV 19 06 01 00 ff ff 00 00
DEF 19 06 01 00 ff ff 00 00
CHG 19 06 00 00 ff ff 00 00
SAV 9a 0a 00 02 00 00 00 0a 00 00 00 04
DEF 9a 0a 00 02 00 00 00 05 00 00 00 04
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00
SAV 9c 0a 10 00 00 00 00 00 00 00 00 01
DEF 9c 0a 10 00 00 00 00 00 00 00 00 01
CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff
SAV 80 06 00 00 0f 00 00 00
DEF 80 06 00 00 0f 00 00 00
CHG 80 06 f7 40 0f 00 00 00
READ CAPACITY DATA
22 ec b2 5b 00 00 02 00
52 Cheetah 15K.5 SCSI Product Manual, Rev. J
Table 11: ST3146855 Mode sense data
MODE SENSE HEADER DATA
ab 00 10 08 11 17 73 30 00 00 02 00
MODE SENSE PAGES DATA
SAV 81 0a c0 0b ff 00 00 00 05 00 ff ff
DEF 81 0a c0 0b ff 00 00 00 05 00 ff ff
CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff
SAV 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00
DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 87 00 00 00
SAV 83 16 34 2c 00 00 00 1c 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00
DEF 83 16 34 2c 00 00 00 1c 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00
CHG 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 84 16 01 22 64 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
DEF 84 16 01 22 64 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
CHG 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 87 0a 00 0b ff 00 00 00 00 00 ff ff
DEF 87 0a 00 0b ff 00 00 00 00 00 ff ff
CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff
SAV 88 12 10 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00
CHG 88 12 a5 00 00 00 ff ff ff ff 00 00 20 00 00 00 00 00 00 00
SAV 8a 0a 02 00 00 00 00 00 00 00 05 57
DEF 8a 0a 02 00 00 00 00 00 00 00 05 57
CHG 8a 0a 03 f0 00 00 00 00 00 00 00 00
SAV 19 06 01 00 ff ff 00 00
DEF 19 06 01 00 ff ff 00 00
CHG 19 06 00 00 ff ff 00 00
SAV 9a 0a 00 02 00 00 00 0a 00 00 00 04
DEF 9a 0a 00 02 00 00 00 05 00 00 00 04
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00
SAV 9c 0a 10 00 00 00 00 00 00 00 00 01
DEF 9c 0a 10 00 00 00 00 00 00 00 00 01
CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff
SAV 80 06 00 00 0f 00 00 00
DEF 80 06 00 00 0f 00 00 00
CHG 80 06 f7 40 0f 00 00 00
READ CAPACITY DATA
11 17 73 2f 00 00 02 00
Cheetah 15K.5 SCSI Product Manual, Rev. J 53
Table 12: ST373455 Mode sense data
MODE SENSE HEADER DATA
ab 00 10 08 08 8b b9 98 00 00 02 00
MODE SENSE PAGES DATA
SAV 81 0a c0 0b ff 00 00 00 05 00 ff ff
DEF 81 0a c0 0b ff 00 00 00 05 00 ff ff
CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff
SAV 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00
DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 87 00 00 00
SAV 83 16 1a 16 00 00 00 0e 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00
DEF 83 16 1a 16 00 00 00 0e 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00
CHG 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 84 16 01 22 64 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
DEF 84 16 01 22 64 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00
CHG 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SAV 87 0a 00 0b ff 00 00 00 00 00 ff ff
DEF 87 0a 00 0b ff 00 00 00 00 00 ff ff
CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff
SAV 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00
CHG 88 12 a5 00 00 00 ff ff ff ff 00 00 20 00 00 00 00 00 00 00
SAV 8a 0a 02 00 00 00 00 00 00 00 02 d1
DEF 8a 0a 02 00 00 00 00 00 00 00 02 d1
CHG 8a 0a 03 f0 00 00 00 00 00 00 00 00
SAV 19 06 01 00 ff ff 00 00
DEF 19 06 01 00 ff ff 00 00
CHG 19 06 00 00 ff ff 00 00
SAV 9a 0a 00 02 00 00 00 0a 00 00 00 04
DEF 9a 0a 00 02 00 00 00 05 00 00 00 04
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00
SAV 9c 0a 10 00 00 00 00 00 00 00 00 01
DEF 9c 0a 10 00 00 00 00 00 00 00 00 01
CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff
SAV 80 06 00 00 0f 00 00 00
DEF 80 06 00 00 0f 00 00 00
CHG 80 06 f7 40 0f 00 00 00
READ CAPACITY DATA
08 8b b9 97 00 00 02 00
54 Cheetah 15K.5 SCSI Product Manual, Rev. J
10.4 SCSI bus conditions and miscellaneous features supported
Asynchronous SCSI bus conditions supported by the drive are listed below. These conditions cause the SCSI
device to perform certain actions and c an alter the SCSI bus phase sequence. Other miscellaneous operating
features supported are also listed here . R efer t o the Parallel SCSI Interface Manual and the SCSI Commands
Reference Manual for details.
Table 13: SCSI bus conditions and other miscellaneous features
Condition/feature supported by :
Supported Conditions or feature
Y Adaptive Caching
Y Arbitrating System
Y Asynchronous Data Transfer
N Asynchronous Event Notification
Y Attention Condition
N Auto Contingent Allegiance Condition
Y Contingent Allegiance Condition
Y Deferred Error Handling
Y Disconnect/Reconnect
N High voltage differential (HVD) interface available
Y Low voltage differential (LVD) interface available
Y Parameter Rounding (controlled by the Round bit in Mode Select page 0)
Y Queue tagging (up to 64 Queue tags supported)
Y Reporting actual retry count in Extended Sense bytes 15, 16 and 17.
Y Reset Condition
Y Segmented Caching
Y Synchronous Data Transfer
N Zero Latency Read
Supported Status
YGood
Y Check Condition
Y Condition Met/Good
YBusy
Y Intermediate/Good
Y Intermediate/Condition Met/Good
Y Reservation Conflict
Y Queue Full
N ACA Active
Cheetah 15K.5 SCSI Product Manual, Rev. J 55
10.5 Synchronous data transfer
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 Parallel SCSI Interface
Manual and SCSI Commands Reference Manual.
10.5.1 Synchronous data transfer periods supported
In the following tables, M is the synchronous peri od va lu e (in the tr ansfer r ate neg otiation message) th at repr esents the associated transfer period and transfe r rate valu es.
Table 14 lists the synchronous data transfer periods supported by the drive in DT DATA phase. DT DATA
phase is only allowed when using the LVD interface.
Table 14: Synchronous DT DATA transfer periods
Transfer period
M (decimal)
(nanoseconds)
8 6.25 160.0 320.0
9 12.5 80.0 160.0
10 25 40.0 80.0
12 50 20.0 40.0
25 100 10.0 20.0
Table 15 lists the synchronous dat a transfer perio ds supported by the drive in ST DATA phase. ST DA TA phase
is allowed with either LVD or SE interface except as noted.
Transfer rate
(megatransfers/second)
Transfer rate
(MBytes/second) on wide bus
Table 15: Synchronous ST DATA transfer periods
Transfer period
M (decimal)
(nanoseconds)
10 25 40.0
Transfer rate
(megatransfers/second)
1
12 50 20.0
25 100 10.0
50 200 5.0
1. This transfer rate is only allowed when using the LVD interface.
10.5.2 REQ/ACK offset
Cheetah 15K.5 SCSI family drives support RE Q/ACK offset values from 7 to 63 (3Fh). Offsets of 1 through 6
are negotiated to 0 (asynchronous transfer).
10.6 Physical interface
This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O
interface. See Section 10.8 and Section 10.9 for additional terminator information.
Figures 13 and 14 show the locations of the DC power connector, SCSI interface connector, drive select he aders, 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 Parallel SCSI Interface Manual.
56 Cheetah 15K.5 SCSI Product Manual, Rev. J
10.6.1 DC cable and connector
LW model drives receive DC power through a 4-pin connector (see Figure 15 for pin assignment) 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)
LC model drives receive power through the 80-pin I/O connector. See Tables 19 and 20.
J1
Pin 1
Pin 1A
J1
Pin 1
68 Pin
SCSI I/O
Connector
J5
Pin
1P
2P
3P
4P
Pin 1P
J5
Pin 1A
J1-DC Power
Power
+12V
+12V ret
+ 5V ret
+ 5V
J1-DC Power
1P2P3P4P
PCB
Figure 13. LW model drive physical interface (68-pin J1 SCSI I/O connector)
Cheetah 15K.5 SCSI Product Manual, Rev. J 57
80-pin
SCSI I/O
Connector
Pin 1
J6
Figure 14. LC model drive physical interface (80-pin J1 SCSI I/O connector)
10.6.2 SCSI interface physical description
Cheetah 15K.5 SCSI drives support the physical interface requirements of the Ultra320 SCSI Parallel Inter face-4 (SPI-4), and operate compatibly at the interface with devices that support earlier SCSI-2 and SCSI-3
standards. 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 Ultra320 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 corresponding ANSI SPI document referenced in the preceding paragraph. These drives implement driver and receiver circuits that can operate
either SE or LVD. However, they cannot switch dynamically between SE and LVD operation.
The drives typically operate on a bus with other SCSI devices. All devices on the bus must o perate in the same
mode, either SE or LVD, but not a mixture of these. All signals on the bus are common between all devices on
the bus. This bus must be terminat ed at bo th en d s with th e p ro p er imp e da nc e in or de r t o o per ate co rr ectly. Do
not terminate intermediate SCSI devices. In some cases, the SCSI devices at each end have onboard te rmination circuits that can be enabled by installation of a jumper plug (TE) on the device. These termination circuits
receive power from either a source internal to the device, or from a line in the interface cable specifically powered for that purpose. LC and LW model drives do not have onboard termination circuits. Some type of external
termination circuits must be provided for these drives by th e e nd user or de sig ners of the equ ipme nt into wh ich
the drives will be integrated. See the ANSI T10 Standard referenced above for the maximum number of
devices that can successfully operate at various interface transfer rates on SE and LVD buses.
LC model drives plug into PCBA or bulkhead connectors in the host. They may be connected in a daisy chain
by the host backplane wiring or PCBA circuit runs that have adequate DC current carrying capacity to support
the number of drives plugged into the PCBA or bulkhead connectors. A single 80-pin I/O connector cable cannot support the DC current needs of several drives, so no cables beyond the bulkhead connectors should be
used. A single drive connected via a cable to a host 80-pin I/O connector is not recommended.
58 Cheetah 15K.5 SCSI Product Manual, Rev. J
Table 16 shows the interface transfer rates supported by the various drive models defined in this manual.
Table 16: Interface transfer rates supported
Maximum transfer rate
Interface type/
drive models
Asynchronous
Fast-5 Fast-10
Fast-20
(Ultra)
Fast-40
(Ultra2)
Fast-80
(Ultra160)
Fast-160
(Ultra320)
SE ST3300655LW/LC
ST3146855LW/LC
yes yes yes yes no no no
ST373455LW/LC
LVD ST3300655LW/LC
ST3146855LW/LC
yes yes yes yes yes yes yes
ST373455LW/LC
10.6.3 SCSI interface cable requirements
The characteristics of cables used to connect parallel interface drives are discussed in the ANSI standards referenced in this section.
10.6.3.1 Cable requirements
The characteristics of cables used to connect Ultra320 SCSI parallel interface devices are discussed in detail
in Section 6 of ANSI Standard T10/1365D Rev. 3. The cable characteristics that must be considered when
interconnecting the drives described in this manual in a Ultra320 SCSI parallel, daisy-chain interconnected
system are:
• characteristic impedance (see T10/1365D Sections 6.3.3 and 6.3.4)
• propagation delay (see T10/1365D Sectio ns 6.3.6 and 6.3.7)
• stub length (see T10/1365D Section 6.9)
• device spacing (see T10/1365D Section 6.9)
To minimize discontinuances and si gnal reflections, cabl es 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, FAST40, FAST-80, and FAST-160 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 and Fast-160 operation, twisted pair cables are
required.
LC Models
The 80-pin connector option provided on LC models is intended for use on drives that plug directly into backplane connector in the host equipment. In such installations, all backplane wiring segments are subject to the
electromagnetic concepts presented in Standard T10/1365D, Rev. 3, Section 6. For LC model drives, installations with connectors on cables are not recommended.
10.6.4 Mating connectors
Part numbers for the different type connectors that mate with the various Chee tah 15K.5 SCSI I/O conn ectors
are given in the sections following.
Cheetah 15K.5 SCSI Product Manual, Rev. J 59
10.6.4.1 Mating connectors for LW model drives
The nonshielded cable connector shall be a 68 conductor connector consisting of two rows of 34 ma le cont act s
with adjacent contacts 0.050 inch (1.27 mm) apart.
Recommended mating flat cable connector part numbers are:
Amp Model 786096-7 Female, 68-pin, panel mount
Amp Model 786090-7 Female, 68-pin, cable mount
Amp Model 749925-5 (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 Power connector 4 circuit housing
Berg 69307-012 12-position, 2 x 6, 2 mm receptacle housing
[1] See Figure 15.
The drive device connector is a nonshielded 68 conductor connector consisting of two rows of 34 female pins
with adjacent pins 50 mils apart. The connector is keyed by means of its shape (see Figure 16).
10.6.4.2 Mating connectors for LC model drives
The nonshielded connector shall be an 80-conductor connector consisting of two rows of 40 cont acts with a djacent contacts 50 (1.27 mm) mils apart (see Figure 17). I/O connection using a cable is not recommended. The
length and size of the host equipment DC power carrying conductors from the DC power source to the host
equipment 80-pin disc drive interface connector(s) should be strictly designed according to proper power tr ansmission design concepts. No possibility for the equipment user to attach an 80-pin cable/connector should be
allowed, since the length of the DC power carrying conductors could not be controlled and therefore could
become too long for safe power transmission to the drive. Multiconnector 80-conductor cables should especially not be allowed, since the power-carrying conductors on the 80-conductor interface were not intended to
support a series of drives.
To insure that both drive connector and host equipment mating connector mat e properly, both drive connector
and host equipment mating connector must meet the provisions of “SFF-8451 Specification for SCA-2
Unshielded Connections.” To obtain this specification, visit the following web site: www.sffcommittee.org
60 Cheetah 15K.5 SCSI Product Manual, Rev. J
Recommended mating 80-position PCBA mount connectors:
Straight-in connector Hot plug version (with ground guide-pin)
Seagate P/N: 77678703
Amp US P/N:
or
Amp US P/N:
or
2-557103-1
94-0680-02-1
2-557103-2
94-0680-02-2
787311-1 with polarization
787311-2 without polarization
Amp Japan P/N: 5-175475-9
Right-angle to PCBA connectors
Seagate P/N: 77678559
Amp US P/N: 2-557101-1
Amp Japan P/N: 5-175474-9
For additional information call Amp FAX service at 1-800-522-6752.
“LW” Model
Drive
Terminator
[7]
[6]
2 through X
SCSI devices [4]
Host
Adapter
PCB
[3]
SCSI ID 7 [5]
SCSI ID 1
[1]
SCSI ID 0
[2]
Pin 1
(check your
adapter for Pin 1 location)
[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 T10/1365D (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 has the very lowest priority).
[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 15. SCSI daisy-chain interface cabling for LW drives
Cheetah 15K.5 SCSI Product Manual, Rev. J 61
.100
(2.54)
.1 5 5
.050
.022
3.650–.005
.346
.270
1.650 .3937 .600
.0787 .200
.020 .047
.60
(15.24)
.519
(13.18)
1.816
(46.13)
Position 1
.315
(8.00)
Pos.
1
Pos.
1
3
4
12
.20
(5.08)
.085
(2.16)
typ
x 45¡ chamfer
typ
.315 – .010
(8.00)
.218
(5.54)
Pos. 68
.050
(1.27)
1.650
(41.91)
.980
(24.89)
1.368
(37.74)
Pos. 35
.0787
(2.00)
Pos.
2
3.650
(92.71)
Figure 16. Nonshielded 68-pin SCSI de vice connector used on LW drives
.840 – .005
.767
(19.48)
(21.34)
+.001
—.002
dia
.083
(2.1)
Trifurcated Pins
(4 places)
62 Cheetah 15K.5 SCSI Product Manual, Rev. J
7.00
(.276)
Pin 1
57.87 +/- 0.2
(2.278 +/- .008)
0.15
(.0059)
MYM
–Y–
62.15 +/- 0.15
(2.447 +/- 0.006)
0.15
(.0059)
MYM
Housing
Grounding
Pins
C
of Datum Y
L
12.70
(.500)
End View
2.15 +/- 0.10
2 places
Front View
Insert mating
I/O connector
X
Contact
0.50
(.020)
0.3
(.012)
MYM
Pin 1
1.27
(.05)
Typ
C
L
X
of Datum Y
Pin 40
Pin 41 Pin 80
Figure 17. Nonshielded 80-pin SCSI SCA-2 connector used on LC drives
Top View
Grounding
Pins
Back View
Cheetah 15K.5 SCSI Product Manual, Rev. J 63
Table 17: LW 68-conductor single-ended (SE) P cable signal/pin assignments [11]
Note. A minus sign preceding a signal name indicates that signal is active low.
Signal
name [1]
Connector
contact
number [3]
Cable conductor
number
[2]
Connector
contact
number [3]
Signal
name [1]
GND 1 1 2 35 –DB12
GND 2 3 4 36 –DB13
GND 3 5 6 37 –DB14
GND 4 7 8 38 –DB15
GND 5 9 10 39 –DBP1
GND 6 11 12 40 –DB0
GND 7 13 14 41 –DB1
GND 8 15 16 42 –DB2
GND 9 17 18 43 –DB3
GND 10 19 20 44 –DB4
GND 11 21 22 45 –DB5
GND 12 23 24 46 –DB6
GND 13 25 26 47 –DB7
GND 14 27 28 48 –DBP
GND 15 29 30 49 GND
GND 16 31 32 50 GND
TermPwr 17 33 34 51 TermPwr
TermPwr 18 35 36 52 TermPwr
Reserved 19 37 38 53 Reserved
GND 20 39 40 54 GND
GND 21 41 42 55 –ATN
GND 22 43 44 56 GND
GND 23 45 46 57 –BSY
GND 24 47 48 58 –ACK
GND 25 49 50 59 –RST
GND 26 51 52 60 –MSG
GND 27 53 54 61 –SEL
GND 28 55 56 62 –C/D
GND 29 57 58 63 –REQ
GND 30 59 60 64 –I/O
GND 31 61 62 65 –DB8
GND 32 63 64 66 –DB9
GND 33 65 66 67 –DB10
GND 34 67 68 68 –DB11
Notes [ ]: See page following Table 20.
64 Cheetah 15K.5 SCSI Product Manual, Rev. J
Table 18: LW 68-conductor LVD P cable signal/pin assignments [11]
Note. A minus sign preceding a signal name indicates that signal is active low.
Signal
name [1]
Connector
contact
number [3]
Cable conductor
number
[2]
Connector
contact
number [3]
Signal
name [1]
+DB12 1 1 2 35 –DB12
+DB13 2 3 4 36 –DB13
+DB14 3 5 6 37 –DB14
+DB15 4 7 8 38 –DB15
+DBP1 5 9 10 39 –DBP1
+DB0 6 11 12 40 –DB0
+DB1 7 13 14 41 –DB1
+DB2 8 15 16 42 –DB2
+DB3 9 17 18 43 –DB3
+DB4 10 19 20 44 –DB4
+DB5 11 21 22 45 –DB5
+DB6 12 23 24 46 –DB6
+DB7 13 25 26 47 –DB7
+DBP 14 27 28 48 –DBP
Ground 15 29 30 49 Ground
DIFFSNS [8] 16 31 32 50 Ground
TermPwr 17 33 34 51 TermPwr
TermPwr 18 35 36 52 TermPwr
Reserved 19 37 38 53 Reserved
Ground 20 39 40 54 Ground
+ATN 21 41 42 55 –ATN
Ground 22 43 44 56 Ground
+BSY 23 45 46 57 –BSY
+ACK 24 47 48 58 –ACK
+RST 25 49 50 59 –RST
+MSG 26 51 52 60 –MSG
+SEL 27 53 54 61 –SEL
+C/D 28 55 56 62 –C/D
+REQ 29 57 58 63 –REQ
+I/O 30 59 60 64 –I/O
+DB8 31 61 62 65 –DB8
+DB9 32 63 64 66 –DB9
+DB10 33 65 66 67 –DB10
+DB11 34 67 68 68 –DB11
Notes [ ]: See page following Table 20.
Cheetah 15K.5 SCSI Product Manual, Rev. J 65
Table 19: LC 80-pin single-ended (SE) I/O connector pin assignments [11]
Note. A minus sign preceding a signal name indicates that signal is active low.
Connector
Signal
name [1]
contact
number [3]
Signal
number [3]
Contact
name[1]
12 V CHARGE 1 41 12 V GND
12 V 2 42 12 V GND
12 V 3 43 12 V GND
12 V 4 44 MATED 1 [12]
NC [10] 5 45 NC [10]
NC [10] 6 46 DIFFSNS [8]
–DB11 7 47 GND
–DB10 8 48 GND
–DB9 9 49 GND
–DB8 10 50 GND
–I/O 11 51 GND
–REQ 12 52 GND
–C/D 13 53 GND
–SEL 14 54 GND
–MSG 15 55 GND
–RST 16 56 GND
–ACK 17 57 GND
–BSY 18 58 GND
–ATN 19 59 GND
–DBP 20 60 GND
–DB7 21 61 GND
–DB6 22 62 GND
–DB5 23 63 GND
–DB4 24 64 GND
–DB3 25 65 GND
–DB2 26 66 GND
–DB1 27 67 GND
–DB0 28 68 GND
–DP1 29 69 GND
–DB15 30 70 GND
–DB14 31 71 GND
–DB13 32 72 GND
–DB12 33 73 GND
+5 V 34 74 MATED 2
+5 V 35 75 5 V GND
+5 V 36 76 5 V GND
NC [10] 37 77 ACTIVE LED OUT [4] [9]
RMT-START [5] [9] [12] 38 78 DLYD-START [6] [9] [12]
SCSI ID (0) [7] [9] [12] 39 79 SCSI ID (1) [7] [9] [12]
SCSI ID (2) [7] [9] [12] 40 80 SCSI ID (3) [7] [9] [12]
Notes [ ]: See page following Table 20.
66 Cheetah 15K.5 SCSI Product Manual, Rev. J
Table 20: LC 80-pin single-ended (LVD) I/O connector pin assignments [11]
Note. A minus sign preceding a signal name indicates that signal is active low.
Signal
name [1]
Connector contact
number [3]
Signal
number [3]
Contact
name[1]
12 V CHARGE 1 41 12 V GND
12 V 2 42 12 V GND
12 V 3 43 12 V GND
12 V 4 44 MATED 1 [12]
NC [10] 5 45 NC [10]
NC [10] 6 46 DIFFSNS [8]
–DB11 7 47 +DB11
–DB10 8 48 +DB10
–DB9 9 49 +DB9
–DB8 10 50 +DB8
–I/O 11 51 +I/O
–REQ 12 52 +REQ
–C/D 13 53 +C/D
–SEL 14 54 +SEL
–MSG 15 55 +MSG
–RST 16 56 +RST
–ACK 17 57 +ACK
–BSY 18 58 +BSY
–ATN 19 59 +ATN
–DBP 20 60 +DBP0
–DB7 21 61 +DB7
–DB6 22 62 +DB6
–DB5 23 63 +DB5
–DB4 24 64 +DB4
–DB3 25 65 +DB3
–DB2 26 66 +DB2
–DB1 27 67 +DB1
–DB0 28 68 +DB0
–DBP1 29 69 +DP1
–DB15 30 70 +DB15
–DB14 31 71 +DB14
–DB13 32 72 +DB13
–DB12 33 73 +DB12
+5 V 34 74 MATED 2
+5 V 35 75 5 V GND
+5 V CHARGE 36 76 5 V GND
NC [10] 37 77 ACTIVE LED OUT [4] [9]
RMT_START [5] [9] [12] 38 78 DLYD_START [6] [9] [12]
SCSI ID (0) [7] [9] [12] 39 79 SCSI ID (1) [7] [9] [12]
SCSI ID (2) [7] [9] [12] 40 80 SCSI ID (3) [7] [9] [12]
Notes [ ]: See page following this table.
Cheetah 15K.5 SCSI Product Manual, Rev. J 67
Notes [ ] for Tables 17 through 20.
[1] See Section 10.6.4.1 for detailed electrical characteristics of these signals.
[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 st art s a t power on or a f ter a dela y of 12 sec-
onds times drive ID). This and [3] above are mutually exclusive options.
[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 sin gle ended device on the bus.
Drive will not operate I/O bus at Ultra2 or faster SCSI data rates if this is grounded.
[9] Sig nals [4] through [7] are used in plac e of installing jumpers and cables on option select connector 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 sin gle -ende d ( SE) I/O shal l have the follo win g signals
open: DB8, –DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.
All other signals should be connected as shown.
[12] Pins 38, 39, 40, 44, 78, 79, and 80 are option select pins and are tied high by the drive circuitry. The pre-
ferred electrical connection at the backplane is either open or grounded (open for the ‘1’ setting, grounded
for the ‘0’ setting). Alternatively, these pins may be driven by a 3.3V logic device, pulled up to 3.3V
through a pull-up resistor (recommended size of 10K ohm), or grounded through some other means.
10.7 Electrical description
Cheetah 15K.5 SCSI drives are multimode devices. That is, their I/O circuits can operate as either singleended or low voltage differential drivers/receivers (selectable using the I/O “DIFFSENS” line).
See ANSI Standard T10/1320D for detailed electrical specifications.
10.7.1 Multimode—SE and LVD alternatives
When the interface “DIFFSNS” line is between -0.35 V an d +0.5 V, the drive interface circuits operate singleended 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 Ultra320 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 dif fer ential levels a nd should never be expo sed to high vo ltag e dif feren tial
environments unless the common mode voltages in the environment are controlled to safe levels for singleended and low voltage differential devices (see ANSI SPI-4 specification T10/1365D).
LC and LW model drives do not have onboard terminators. Termination of the I/O lines must be provided for by
the Host equipment designers or end users.
LVD output characteristics
Each differential signal driven by LVD interface drivers shall have the following output characteristics when
measured at the disc drive connector:
Steady state Low level output differential voltage = 0.32 V = < |V
Steady state High level output differential voltage = 0.32 V = < |V
| = < 0.8 V (signal negation/logic 0)
s
| = < 0.8 V (signal assertion/logic 1)
s
68 Cheetah 15K.5 SCSI Product Manual, Rev. J
LVD Input characteristics
Each differential signal received by LVD interface receiver circuits shall have the following input characteristics
when measured at the disc drive connector:
Steady state Low level input differential voltage = 0.030 V = < V
Steady state High level input differential voltage = –3.6 V = < V
Differential voltage = +
0.030 V minimum with common-mode voltage range 0.845 V = < Vcm = < 1.685 V.
(T10/1302D revision 20b, section A.3.1).
VCCA VCCB
Single
Ended
Circuitry
Single
Ended
Ground
Driver
Ground
Single Ended:
LVD:
GND
+Signal
Figure 18. Typical SE-LVD alternative transmitter receiver circuits
LVD Signal Drivers
LVD
Receiver
LVD Signal Drivers
Single
Ended
Receiver
—Signal
—Signal
Single
Ended
Negation
Driver
Single
Ended
Assertion
Driver
= < 3.6 V (signal negation/logic 0)
in
= < –0.030 V (signal assertion/logic 1)
in
10.7.1.1 General cable characteristics
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.
10.7.1.2 Single-ended drivers/receivers
The maximum total cable length allowed with drives using single-ended I/O driver and receiver circuits
depends on several factors. Table 21 lists the maximum lengths allowed for different configurations of drive
usage. These values are from the SPI documents. All device I/O lines must have equal to or less than 25 pf
capacitance to ground, measured at the beginning of the stub.
Table 21: Cable characteristics for single-ended circuits
Maximum length
between SCSI S.E.
terminators
I/O transfer rate
Maximum number of
devices on the bus
<10M transfers/s (Fast 10) 16 (wide SCSI bus) 3 meters (9.8 ft) 90 + 6 Ohms 90 + 10 Ohms
<20M transfers/s (Fast 20) 4 (wide SCSI bus) 3 meters (9.8 ft) 90 + 6 Ohms 90 + 10 Ohms
<20M transfers/s (Fast 20) 8 (wide SCSI bus) 1.5 meters (4.9 ft) 90 + 6 Ohms 90 + 10 Ohms
Transmission line impedance
REQ/ACK Other signals
A stub length of no more than 0.1 meter (0.33 ft ) is allowed of f th e mainline interconnectio n with any conne cted
equipment. The stub length is measur ed fro m th e tra nsceiver to the connection to the mainline SCSI bus.
Cheetah 15K.5 SCSI Product Manual, Rev. J 69
Single-ended I/O cable pin assignments for LW drives are shown in Table 18.
Single-ended I/O pin assignments for LC models are shown in T a ble 19. Th e L C mo de l does not re quir e an I/O
cable. It is designed to connect directly to a back panel connector.
10.7.1.3 Cables for low voltage differential drivers/receivers
The SPI-3 and SPI-4 specification for differential impedance for LVD cables is 122.5 + 12.5 ohms.
The maximum SCSI bus length between the terminators for a SCSI LVD point-to-point system (one initiator
and one target) is 25 meters (82 feet).
The maximum SCSI bus length between the terminators for a SCSI LVD multidrop system (up to 16 total SCSI
devices) is 12 meters (39.37 f eet). However, implementation of this 12-meter total length is dependent on the
configuration of the system and the choice of cable. See Tables 22 and 23 for e xamples of recommended
SCSI LVD cable types and lengths.
It should be noted from the data in Tables 22 and 23 that shielded round twisted-pair cables can be used to
implement a 12-meter system, while T wist-n-flat cables cannot be used to implemen t a 12-meter system due to
higher levels of attenuation and crosstalk. In addition, twist-n-flat cables with shorter sections of twist allow
greater crosstalk and their lengths must be red uced as shown in Table 23.
Table 22: Shielded round twisted-pair cables—into a multi-drive backplane
Cable
description
30 AWG
solid
28 AWG
stranded
28 AWG
stranded
SingleDifferential
impedance
, nominal
130 ohms 90 ohms 17 pF/ft 1.36 ns/ft 0.113 ohms/ft
123 ohms 80 ohms 19 pF/ft 1.54 ns/ft 0.067 ohms/ft
132 ohms 85 ohms 20 pF/ft 1.50 ns/ft 0.065 ohms/ft
ended
impedance,
nominal
Single-
ended
capacitance,
maximum
Time
delay,
nominal
Table 23: Twist-n-flat cables—into a multi-drive backplane
Single-
Cable description
TPE, 22.25” twist,
1.75” flat, (24” flat
to flat), 30 AWG
solid tinned copper
Differential
impedance
, nominal
131 ohms 93 ohms 15.3 pF/ft 1.45 ns/ft 0.105 ohms/ft
Single-ended
impedance,
nominal
ended
capacitance,
maximum
nominal
Time
delay,
Conductor
DC
resistance,
nominal
Conductor
DC
resistance,
nominal
Maximum shielded round
twisted-pair cable length
for U160/U320
12 meters minus the SCSI
trace length of the backplane
12 meters minus the SCSI
trace length of the backplane
12 meters minus the SCSI
trace length of the backplane
Maximum Twist-n-flat
cable length
U320 U160
3.05 meters
(10.0 ft)
6.1 meters
(20.0 ft)
TPE, 8.1” twist,
1.75” flat, (9.85” flat
to flat), 30 AWG
solid tinned copper
TPE, 4.25” twist,
1.75” flat, (6” flat to
flat), 30 AWG solid
tinned copper
131 ohms 93 ohms 15.3 pF/ft 1.45 ns/ft 0.105 ohms/ft
131 ohms 93 ohms 15.3 pF/ft 1.45 ns/ft 0.105 ohms/ft
2.45 meters
(8.33 ft)
1.52 meters
(5.0 ft)
4.9 meters
(16.66 ft)
3.04 meters
(10.0 ft)
70 Cheetah 15K.5 SCSI Product Manual, Rev. J
10.8 Terminator requirements
Caution: These drives do not have onboard internal term inators. The user, systems integrator or host equip-
ment manufacturer must provide a terminator arrangement e xternal 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. LC drives are designed to be plugged into a backpanel connector without cabling.
10.9 Terminator power
LW drives
You can configure terminat or 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 9.1 for illustrations that show how to place
jumpers for this configuration.
LC drives
These drives cannot furnish terminator power because no conductors in the 80-pin I/O connector are devoted
to terminator power.
Cheetah 15K.5 SCSI Product Manual, Rev. J 71
10.10 Disc drive SCSI timing
Table 24: Disc drive SCSI timing
These values are not current Cheetah 15K.5 SCSI values, but are liste d fo r info rm a tio n on ly.
Description
Waveform
symbol [1]
Waveform
table [1] Typical timing
Target Select Time (no Arbitration) T00 N/A <1 μs
Target Select Time (with Arbitration) T01 4.5-1,2 1.93 μs
Target Select to Command T02 4.5-1 3.77 μs
Target Select to MSG Out T03 4.5-2 1.57 μs
Identify MSG to Command T04 4.5-3 3.36 μs
Command to Status T05 4.5-5 Command Depen-
dent
Command to Data (para. In) T06 4.5-9 Command Depen-
dent
Command to Data (para. Out) T07 4.5-10 Command Depen-
dent
Command to Data (Write to Data Buffer) T08 4.5-10 Command Depen-
dent
Command to Disconnect MSG T09 4.5-6 Command Depen-
dent
Disconnect MSG to Bus Free T10 4.5-6,14 0.52 μs
Disconnect to Arbitration (for Reselect)
This measures disconnected CMD over-
T11 4.5-6 Command Depen-
dent
head
Target win Arbitration (for Reselect) T12 4.5-7 3.00 μs
Arbitration to Reselect T13 4.5-7 1.60 μs
Reselect to Identify MSG In T14 4.5-7 1.39 μs
Reselect Identify MSG to Status T15 4.5-8 Command Depen-
dent
Reselect Identify MSG to Data (media) T16 4.5-11 Command Depen-
dent
Data to Status T17 4.5-15 Command Depen-
dent
Status to Command Complete MSG T18 4.5-5,8,15 0.98 μs
Command Complete MSG to Bus Free T19 4.5-5,8,15 0.51 μs
Data to Save Data Pointer MSG T20 4.5-14 4.00 μs
Save Data Pointer MSG to Disconnect MSG T21 4.5-14 0.79 μs
Command Byte Transfer T22 4.5-4 0.04 μs
Next Command Byte Access: 4.5-4
Next CDB Byte Access (Byte 2 of 6) T23.6.2 4.5-4 0.58 μs
Next CDB Byte Access (Byte 3 of 6) T23.6.3 4.5-4 0.12 μs
Next CDB Byte Access (Byte 4 of 6) T23.6.4 4.5-4 0.12 μs
Next CDB Byte Access (Byte 5 of 6) T23.6.5 4.5-4 0.12 μs
Next CDB Byte Access (Byte 6 of 6) T23.6.6 4.5-4 0.12 μs
72 Cheetah 15K.5 SCSI Product Manual, Rev. J
Table 24: Disc drive SCSI timing (Continued)
These values are not current Cheetah 15K.5 SCSI values, but are liste d fo r info rm a tio n on ly.
Description
Waveform
symbol [1]
Waveform
table [1] Typical timing
Next CDB Byte Access (Byte 2 of 10) T23.10.2 4.5-4 0.59 μs
Next CDB Byte Access (Byte 3 of 10) T23.10.3 4.5-4 0.11 μs ±1 μs
Next CDB Byte Access (Byte 4 of 10) T23.10.4 4.5-4 0.12 μs ±1 μs
Next CDB Byte Access (Byte 5 of 10) T23.10.5 4.5-4 0.11 μs ±1 μs
Next CDB Byte Access (Byte 6 of 10) T23.10.6 4.5-4 0.11 μs ±1 μs
Next CDB Byte Access (Byte 7 of 10) T23.10.7 4.5-4 0.13 μs ±1 μs
Next CDB Byte Access (Byte 8 of 10) T23.10.8 4.5-4 0.12 μs ±1 μs
Next CDB Byte Access (Byte 9 of 10) T23.10.9 4.5-4 0.12 μs ±1 μs
Next CDB Byte Access (Byte 10 of 10) T23.10.10 4.5-4 0.12 μs ±1 μs
Data In Byte Transfer (parameter) T24 4.5-12 0.04 μs
Data Out Byte Transfer (parameter) T25 4.5-13 0.04 μs
Next Data In Byte Access (parameter) T26 4.5-12 0.12 μs
Next Data Out Byte Access (parameter) T27 4.5-13 0.12 μs
Data In Byte Transfer (media) [2] T28 4.5-12 0.04 μs
Data Out Byte Transfer (media) [2] T29 4.5-13 0.04 μs
Next Data In Byte access (media [2] T30 4.5-12 0.12 μs
Next Data Out Byte access (media [2] T31 4.5-13 0.12 μs
MSG IN Byte Transfer T32 4.5-5,7,8,14,15 0.04 μs
MSG OUT Byte Transfer T33 4.5-2 0.04 μs
STATUS Byte Transfer T34 4.5-5,8,15 0.04 μs
Synchronous Data Transfer Characteristics:
Request Signal Transfer Period [3] – – various (800 ns max)
Notes.
[1] See the Timing examples section of the Parallel SCSI Interface Manual.
[2] Maximum SCSI asynchronous interface transfer rate is given in Section 5.2.3 of this manual.
[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
10.5. See also the Synchronous data transfer section and
the Extended messages section of the Parallel SCSI Interface Manual for a description of synchronous
data transfer operation.
Cheetah 15K.5 SCSI Product Manual, Rev. J 73
10.11 Drive activity LED
The following table provides drive activity LED status.
Table 25: Drive activity LED status
Spindle status Command status LED status
Spinning up with DC power applied N/A On until spinup is complete
Spun down Start Unit On while processing the command
Powered down by removal of DC
power
Spun up Stop Unit On while processing the command
Spun down No command activity Off
Spun down Write/Read Buffer On while processing the command
Spun down SCSI Bus Reset On while processing the reset
Spun down Te st Unit Ready On while processing the command
Spun up No command activity Off
Spun up Write/Read On while processing the command
Spun up SCSI Bus Reset On while processing the reset
Spun up Test Unit Ready On while processing the command
Spun up Format with Immediate option on On while the command is initially processed
Spun up Format without Immediate LED toggles on/off on each cylinder boundary
Spun up Write Same Command in prog-
N/A Off due to absence of power
Toggles on/off
ress
74 Cheetah 15K.5 SCSI Product Manual, Rev. J
Index
bytes per sector 49
Symbols
+5 and +12 volt supplies 23
Numerics
68-conductor connector 60
68-pin connector 61
80 conductor connector 60
80 conductor interface 60
80-pin connector option 59
80-pin I/O connector 66, 67
A
AC power 22
access time 11
accessories 9
acoustics 33
activity indicator 68
activity LED 74
actuator 43
actuator assembly 7
AFR 14
air cleanliness 32
air flow 43
suggested 43
altitude 29
altitude and atmospheric pressure 29
ambient 29
Annualized Failure Rate 14
Annualized Failure Rates (AFR) 15
ANSI SCSI documents 5
arbitration priority 61
asynchronous interface transfer rate 73
audible noise 3
Australia/New Zealand Standard 4
automatic retry 14
automatic shipping lock 7
average idle current 22, 23
average latency 8
average rotational latency 10, 11
B
Background Media Scan 37
background processing 8
backward compatibility 6
bits/inch 10
BMS 37
buffer 12
space 12
bulkhead connector 58
bus device reset message 51
C
cable 57
cache 12
cache buffer 8
cache mode 12
cache operation 12
cache segments 13
caching write data 13
Canadian Department of Communications 3
capacities 9
capacity, drive, programmable 9
CE Marking 4
changeable bit 51
changeable value 51
check condition 51
circuits 69
class B limit 3
command 12, 46
command descriptor block (CDB) 11
command queuing 8
condensation 29
conducted noise immunity 23, 24
connect/disconnect 11
connector 57
connector contact 68
continuous vibration 32
controller 12
controller overhead 11
cooling 43
C-Tick Marking 4
current 24
current profile 24, 25
current requirements 22
current value 51
D
daisy-chain 24, 58, 61
DAR 38
data block size
modifing the 8
data correction 14
data transfer period 56
data transfer protocol 7
data transfer rate 11
DC cable and connector 57
DC current 58
DC power 12, 14, 42, 57
DC power carrying conductor 60
DC power connector 56
DC power requirements 22
DC power source 60
dedicated landing zone 6
Cheetah 15K.5 SCSI Product Manual, Rev. J 75
default 41, 42
default mode parameter 39
default value 51
defect/error management 35
defects 35
Deferred Auto-Reallocation 38
delayed motor start option 22, 23, 68
delayed start 42
differential I/O circuit 42
differentiating features 6
dimensions 33
disc rotational speed 10
drive 32
drive activity 68
drive activity LED 74
drive capacity 10
programmable 9
drive default mode parameter 39
drive firmware 51
drive ID 39
drive ID select jumper connector 39
drive ID/option select header 39
drive interface connector 60
drive internal defects and errors 35
drive mounting 33, 44
constraints 14
drive orientation 43
drive power 39
drive primary defects list 35
drive SCSI timing 72
drive select header 56
drive spindle 42
dynamic spindle brake 7
E
ECC 14
ECC correction capability 7
electrical characteristics 56, 68
electromagnetic compatibility 3
electromagnetic susceptibility 33
embedded servo 7
EMC compliance 4
EMI requirements 3
environmental control 32
environmental limits 29
environmental requirements 14
EPROM 51
error 14
management 35
error management system 37
error rate 14
error recovery 35
errors 35
ETF defect list 35
European Union requirements 4
EVPD bit 50
execution time 11
extended messages 46
F
FCC rules and regulations 3
firmware 51
flat ribbon cable 68
flaw reallocation 11
format 49
format command 11
format time 11
formatting 39
front panel 33
front panel LED 68
G
gradient 29
ground return 23
grounding 44
H
hard reset 51
HDA 6, 44
heat removal 43
host 42, 49, 58, 61
host adapter 39
adapter/initiator 61
host backplane wiring 58
host equipment 44, 59, 60
DC power 60
host I/O signal 39
host system 39
host system malfunction 14
host/drive operational interface 14
hot plug 7, 16
humidity 29
I
I/O connector 58
identified defect 35
Idle Read After Write 38
Input characteristics 69
inquiry command 50
inquiry vital product data 50
installation 39
installation guide 9
installation instructions 39
instantaneous current peak 23
integrated Ultra1/Ultra2 SCSI controller 7
interface cable length 61
interface data 11
interface requirements 45
76 Cheetah 15K.5 SCSI Product Manual, Rev. J
interface timing 14
internal data rate 10
IRAW 38
J
J1-auxiliary 39
jumper 9, 39, 41, 42, 68
jumper function description 42
jumper header 41
jumper plug type 39
L
landing zone 7
LED 74
logical block address 12
logical characteristics 56
logical segments 12
low voltage differential (LVD) drivers and receiver s 7
LVD 68
LVD interface receiver circuits 69
M
mating connector 57, 59, 60
mating flat cable connector 60
maximum current requirements 24
maximum operating current 23
maximum starting current 22, 23
ME jumper 42
mean time between failure (MTBF) 15
media 7, 51
Media Pre-Scan 37
message protocol 56
message protocol system 37
messages
SCSI interface 45
miscellaneous features 55
mode page 01 51
mode page 08h 12
mode parameter 51
mode select command 12, 51
mode sense command 51
mode sense data 51
mode sense value 51
model number table 6
motor start command 12
motor start delay option 68
motor start option 12, 23, 68
mounting configuration 33
mounting configuration dimensions 33, 34
mounting constraints 14, 44
mounting point 44
mounting surface 44
mounting surface distortion 44
mounting surface stiffness 44
MTBF 14, 15
multiconnector
80 conductor 60
multimode drivers and receivers 7
multi-segmented cache control 12
N
noise 24
audible 3
non-operating 29, 30, 32
temperature 29
non-operating vibration 32
nonshielded 68 conductor connector 60
O
office environment 32
operating 29, 30, 32
operating option 39
operating parameter 51
option jumper 39
option jumper location 39
option select header 56
option select jumper 39
options 9
orientation 30, 43
out-of-plane deflection 44
out-of-plane distortion 44
Output characteristics 68
P
package size 30
package test specification 5
packaged 30
parity 42
parity checking 42
parity error 42
PCB 41
PCBA 39, 44, 51, 57, 58, 61
PCBA circuit run 58
PD jumper 42
peak bits/inch 10
peak starting current 23
performance characteristics 10
performance degradation 30
peripheral I/O cable 24
physical characteristics 56
physical damage 32
physical interface 56, 58
power 23, 42
power connector 22, 24
power control switch 12
power dissipation 26
power distribution 3
power sequencing 24
Cheetah 15K.5 SCSI Product Manual, Rev. J 77
power supply voltage 14
power-carrying conductor 60
power-on 39, 68
power-on reset 51
power-up 24, 42
prefetch 12
prefetch (read look-ahead) 12
prefetch mode 12
prefetch operation 12
prefetch segmented cache control 12
preventive maintenance 14, 15
product data page 50
programmable drive capacity 9
R
radio interference regulations 3
RCD bit 12
read error rate 14
read error rates 35
read retry count 35
read/write head 10
ready 51
receive diagnostic results 37
receiver circuits 69
recommended mounting 31
Recoverable Errors 14
reference documents 5
regulation 22, 23
relative humidity 29
reliability 8
reliability and service 15
reliability specifications 14
remote switch 39
repair information 21
REQ/ACK offset 56
request sense command 37
resonance 30
S
S.M.A.R.T. 8, 16
safe power transmission 60
safety 3
saved value 51
SCSI
commands 46
interface data transfer rate 11
messages 45
SCSI bus cable 39
SCSI bus condition 55
SCSI bus ID 68
SCSI bus phase sequence 55
SCSI command 35
SCSI Commands Reference Manual 5
SCSI I/O connector 58
SCSI ID 39, 42
SCSI interface 12, 58
SCSI interface cable 59
SCSI interface commands supported 46
SCSI interface connector 56
SCSI interface data 11
SCSI Interface Product Manual 3, 5, 6
SCSI systems error 37
SCSI systems error management 37
Seagate support service 39
sector sizes 11
seek error 14
defined 15
Self-Monitoring Analysis and Reporting Technology.
See S.M.A.R.T.
SE-LVD alternative 69
shielding 3
shipping 21
shipping container 29
shock 30
and vibration 30
shock mount 44
signal ground 44
single unit shipping pack 9
single-ended (SE) drivers and receivers 7
spindle startup 42
standard day 29
standards 3
start motor command 23
start unit command 42
start/stop time 12
status 37
stop spindle 12
stop time 12
straight-in connector 61
supply voltage 23
support services 1
synchronous data transfer 56
synchronous data transfer operation 73
synchronous data transfer period 56
synchronous transfer period 73
system chassis 44
T
technical support services 1
temperature 18, 29, 43
non-operating 29
regulation 3
See also cooling
temperature sensor 18
termination 24
terminator enable jumper TE 61
terminator power 71
terminator requirements 39, 71
thermal monitor 18
78 Cheetah 15K.5 SCSI Product Manual, Rev. J
TP1 position 42
tracks/inch 10
tracks/surface, total 10
transfer period 56
transmitter receiver circuits 69
Tunneling Magnetoresistive heads 6
U
Ultra160 51
Ultra160 mode 46
Ultra160 SCSI interface 6
Ultra320 SCSI controller 7
unformatted 8
Unrecoverable Errors 14
V
vibration 30, 32
vital product data 50
volatile memory 51
voltage 22, 23
W
warranty 8, 20
wet bulb temperature 29
wide Ultra160 SCSI interface 6
WP jumper 42
write protect 42
write retry count 35
Z
zoned bit recording (ZBR) 7
Cheetah 15K.5 SCSI Product Manual, Rev. J 79
Seagate Technology LLC
920 Disc Drive, Scotts Valley, California 95066-4544, USA
Publication Number: 100384776, Rev. J
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