seagate ST336752LW, ST336752LC, ST336732LW, ST336732LC, ST318452LW Product Manual

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Cheetah X15 36LP Disc Drive:

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ST336752L W/LC, ST336732LW/LC

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ST318452L W/LC, ST318432LW/LC

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Product Manual, Volume 1

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Cheetah X15 36LP Disc Drive:

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ST336752L W/LC, ST336732LW/LC

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ST318452L W/LC, ST318432LW/LC

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Product Manual, Volume 1

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©2001, 2002 Seagate Technology LLC All rights reserved

Publication number: 100139872, Rev. D

June 2002

Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Technology LLC.
Cheetah, SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either registered trademarks or trademarks of
Seagate Technology LLC. Other product names are registered trademarks or trademarks of their owners.

Seagate reserves the right to change, without notice, product offerings or specifications. No part of this publica-

tion may be reproduced in any form without written permission of Seagate Technology LLC.

Revision status summary sheet

Revision Date Writer/Engineer Sheets Affected

Rev. A 06/27/01 L. Newman/J. Nowitzke All.
Rev. B 11/30/01 L. Newman/B. Hohn Pages 27, 36, 38, 39, and 56.
Rev. C 02/08/02 L. Newman/B. Hohn Pages 5, 51 and 52.
Rev. D 06/04/02 L. Newman/B. Hohn Pages 4, 67-70, 73-75.

Notice.
Product Manual 100139872 is Volume 1 of a two volume document with the SCSI Interface information

in the Volume 2 SCSI Interface Product Ma nual, part number 75789509.
If you need the SCSI Interface information, order the Volume 2 Interface Manual, part number

75789509.

Cheetah X15 36LP Product Manual, Rev. D 5

Contents

1.0 Scope..........................................................................1

2.0 Applicablestandardsandreferencedocumentation....................................3

2.1 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.1.1 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.1.2 Electromagnetic susceptibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.3 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.0 Generaldescription...............................................................5

3.1 Standard features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.2 Media characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.3 Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.4 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.5 Unformatted and formatted capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.6 Programmable drive capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.7 Factory installed accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.8 Options (factory installed). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.9 Accessories (user installed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.0 Performancecharacteristics.......................................................8

4.1 Internal drive characteristics (transparent to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.2 SCSI performance characteristics (visible to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.2.1 Access time [5] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.2.2 Format command execution time (minutes) [1] . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.2.3 Generalized performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.3 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.4 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.5 Cache operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.5.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.5.3 Optimizing cache performance for desktop and server applications . . . . . . . . . . . 11

5.0 Reliability specifications . . . . . . . . . ................................................13

5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.1 Environmental interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.2 Read errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.3 Write errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.4 Seek errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2 Reliability and service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.1 Mean time between failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.2 Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.3 Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.4 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.5 Service tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.6 Hot plugging Cheetah X15 36LP disc drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.7 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.8 Thermal Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.9 Drive Self Test (DST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.2.10 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.0 Physical/electricalspecifications ..................................................21

6.1 AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.2 DC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.2.1 Conducted noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.2.3 12 V - Current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.3 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6 Cheetah X15 36LP Product M anual, Rev. D

6.4 Environmental limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

6.4.1 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

6.4.3 Effective altitude (sea level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

6.4.6 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

6.4.7 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

7.0 Defectanderrormanagement .....................................................33

7.1 Drive internal defects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

7.2 Drive error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

7.3 SCSI systems errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

8.0 Installation .....................................................................35

8.1 Drive ID/option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

8.1.1 Notes for Figures 14, 15, and 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

8.1.2 Function description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

8.2 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

8.3 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

8.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

8.5 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

9.0 Interfacerequirements............................................................43

9.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

9.2 SCSI interface messages supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

9.3 SCSI interface commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

9.3.1 Inquiry Vital Product data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

9.3.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

9.4 SCSI bus conditions and miscellaneous features supported . . . . . . . . . . . . . . . . . . . . . . . . .53

9.5 Synchronous data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.5.1 Synchronous data transfer periods supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.5.2 REQ/ACK offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.6 Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.6.1 DC cable and connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

9.6.2 SCSI interface physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

9.6.3 SCSI interface cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

9.6.4 Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

9.7 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

9.7.1 Multimode—SE and LVD alternatives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

9.8 Terminator requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

9.9 Terminator power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

9.10 Disc drive SCSI timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

9.11 Drive activity LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

10.0 Seagate Technology support services. . . ............................................73

Cheetah X15 36LP Product Manual, Rev. D 7

List of Figures

Figure 1. Cheetah X15 36LP family drive (ST336752LC shown) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Typical ST336752 and ST336732 drive +12 V current profile . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 3. Typical ST336752 and ST336732 drive +5 V current profile. . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 4. Typical ST318452 and ST318432 drive +12 V current profile . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 5. Typical ST318452 and ST318432 drive +5 V current profile. . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 6. ST336752 and ST336732 DC current and power vs. IOPS (SE) . . . . . . . . . . . . . . . . . . . . . 25

Figure 7. ST336752 and ST336732 DC current and power vs. IOPS (LVD) . . . . . . . . . . . . . . . . . . . . 25

Figure 8. ST318452 and ST318432 DC current and power vs. IOPS (SE) . . . . . . . . . . . . . . . . . . . . . 26

Figure 9. ST318452 and ST318432 DC current and power vs. IOPS (LVD) . . . . . . . . . . . . . . . . . . . . 26

Figure 10. Locations of the HDA temperature check point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 11. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 12. LW mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 13. LC mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 14. J6 jumper header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 15. J5 jumper header (on LW models only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 16. J2 option select header (on LW models only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 17. Air flow (suggested) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 18. LW model drive physical interface (68-pin J1 SCSI I/O connector) . . . . . . . . . . . . . . . . . . . . 56

Figure 19. LC model drive physical interface (80-pin J1 SCSI I/O connector) . . . . . . . . . . . . . . . . . . . . 56

Figure 20. SCSI daisy chain interface cabling for LW drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 21. Nonshielded 68 pin SCSI device connector used on LW drives . . . . . . . . . . . . . . . . . . . . . . 61

Figure 22. Nonshielded 80 pin SCSI “SCA-2” connector, used on LC drives . . . . . . . . . . . . . . . . . . . . . 62

Figure 23. Typical SE-LVD alternative transmitter receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Cheetah X15 36LP Product Manual, Rev. D 1

1.0 Scope

This manual describes Seagate Technology® LLC, Cheetah® X15 36LP disc drives.

Cheetah X15 36LP drives support the small computer system interface (SCSI) as described in the ANSI SCSI

SPI-4 interface specifications to the extent described in this manual. The SCSI Interface Product Manual (part

number 75789509) describes general SCSI interface characteristics of this and other families of Seagate
drives.

From this point on in this product manual the reference to Cheetah X15 36LP models is referred to as “the
drive” unless references to individual models are necessary.

Figure 1 . Cheetah X15 36LP family drive (ST336752LC shown)

2 Cheetah X15 36LP Product M anual, Rev. D

Cheetah X15 36LP Product Manual, Rev. D 3

2.0 Applicable standards and reference documentation

The drive has been developed as a system peripheral to the highest standards of design and construction. The
drive depends upon its host equipment to provide adequate power and environment in order to achieve 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 8.4.

2.1 Standards

The Cheetah X15 36LP family complies with Seagate standards as noted in the appropriate sections of this

Manual and the Seagate SCSI Interface Product Manual, part number 75789509 (Vol. 2).

The Cheetah X15 36LP disc drive is a UL recognized component per UL1950, CSA certified to CSA C22.2 No.
950-95, and VDE certified to VDE 0805 and EN60950.

2.1.1 Electromagnetic compatibility

The drive, as delivered, is designed for system integration and installation into a suitable enclosure prior to
use. As such the drive is supplied as a subassembly and is not subject to Subpart B of Part 15 of the FCC
Rules and Regulations nor the Radio Interference Regulations of the Canadian Department of 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 enclosure does not provide adequate shielding. If the I/O cables are external to
the enclosure, shielded cables should be used, with the shields grounded to the enclosure and to the host con­troller.

2.1.2 Electromagnetic susceptibility

As a component assembly, the drive is not required to meet any susceptibility performance requirements. It is
the responsibility of those integrating the drive within their systems to perform those tests required and design
their system to ensure that equipment operating in the same system as the drive or external to the system
does not adversely affect the performance of the drive. See Section 5.1.1 and Table 3, DC power requirements.

2.2 Electromagnetic compliance

Seagate uses an independent laboratory to confirm compliance to the directives/standard(s) for CE Marking
and C-Tick Marking. The drive was tested in a representative system for typical applications. The selected 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.

4 Cheetah X15 36LP Product M anual, Rev. D

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 paragraph
1 of Article 11 of the Electromagnetic Compatibility (EMC) Control Regulation and meets the Electromagnetic
Compatibility Framework requirements of the Radio Research Laboratory (RRL) Ministry of Information and
Communication Republic of Korea.

Taiwanese BSMI

If this model has two Chinese words meaning “EMC certification” followed by an eight digit identification num­ber, as a Marking, it complies with Chinese National Standard (CNS) 13438 and meets the Electromagnetic
Compatibility (EMC) Framework requirements of the Taiwanese Bureau of Standards, Metrology, and Inspec­tion (BSMI).

2.3 Reference documents

Cheetah X15 36LP Installation Guide Seagate P/N 100139875
Safety and Regulatory Agency Specifications Seagate P/N 75789512
SCSI Interface Product Manual Seagate P/N 75789509

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 SCSI Parallel Interface - 4 (SPI-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 X15 36LP Product Manual, Rev. D 5

3.0 General description

Cheetah X15 36LP drives combine giant magnetoresistive (GMR) heads, partial response/maximum likelihood
(PRML) read channel electronics, embedded servo technology, and a wide Ultra160 SCSI interface (on
ST336752 and ST318452 models) or a wide Ultra320 SCSI interface (on ST336732 and ST318432 models) to
provide high performance, high capacity data storage for a variety of systems including engineering worksta­tions, network servers, mainframes, and supercomputers.

Ultra160 and Ultra320 SCSI use 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 Cheetah X15 36LP models.

Table 1: Drive model number vs. differentiating features

Interface

Ultra160 Ultra320

Model number

ST336752LW
ST318452LW

ST336752LC
ST318452LC

ST336732LW
ST318432LW

ST336732LC
ST318432LC

Number
of active
heads I/O circuit type [1]

8
4

8
4

8
4

8
4

Single-ended (SE) and low
voltage differential (LVD)

Single-ended (SE) and low
voltage differential (LVD)

Single-ended (SE) and low
voltage differential (LVD)

Single-ended (SE) and low
voltage differential (LVD)

Number of I/O
connector pins

68 X

80 X

68 X

80 X

[1] See Section 9.6 for details and definitions.

The drive records and recovers data on approximately 2.5-inch (65 mm) non-removeable discs.

The drive supports the Small Computer System Interface (SCSI) as described in the ANSI SCSI interface
specifications to the extent described in this manual (volume 1), which defines the product performance char-

acteristics of the Cheetah X15 36LP family of drives, and the SCSI Interface Product Manual (volume 2), part

number 75789509, which describes the general interface characteristics of this and other families of Seagate
SCSI drives.

The drive’s interface supports multiple initiators, disconnect/reconnect, self-configuring host software, and
automatic features that relieve the host from the necessity of knowing the physical characteristics of the targets
(logical block addressing is used).

The head and disc assembly (HDA) is sealed at the factory. Air circulates within the HDA through a 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 X15 36LP drives use a dedicated landing zone at the innermost radius of the media to eliminate the
possibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the
landing zone when power is removed.

An automatic shipping lock prevents potential damage to the heads and discs that results from movement dur­ing shipping and handling. The shipping lock automatically disengages when power is applied to the drive and
the head load process begins.

6 Cheetah X15 36LP Product M anual, Rev. D

Cheetah X15 36LP drives decode track 0 location data from the servo data embedded on each surface to elim­inate mechanical transducer adjustments and related reliability concerns.

A high-performance actuator assembly with a low-inertia, balanced, patented, straight-arm design provides
excellent performance with minimal power dissipation.

3.1 Standard features

The Cheetah X15 36LP family has the following standard features:

• 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

- ST336752 and ST318452 models support Ultra160 transfer rates

- ST336732 and ST318432 models support Ultra320 transfer rates

• Supports Information Unit transfer protocol

• Firmware downloadable via SCSI interface

• Selectable even byte sector sizes from 512 to 704 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 maximum burst correction length of 240 bits with a guaranteed burst correction length of 233 bits.

• Sealed head and disc assembly

• No preventative maintenance or adjustment required

• Dedicated head landing zone

• Embedded servo design

• Self diagnostics performed when power is applied to the drive

• Zoned bit recording (ZBR)

• Vertical, horizontal, or top down mounting

• Dynamic spindle brake

• 8,192 kbytes data buffer

• Hot plug compatibility (Section 9.6.4.2 lists proper host connector needed) for LC model drives

• Drive Self Test (DST)

• Supports SCSI bus fairness

3.2 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.

3.3 Performance

• Supports industry standard interfaces as follows:

- ST336752 and ST318452 models support the Ultra160 SCSI interface

- ST336732 and ST318432 models support the Ultra320 SCSI interface

• Programmable multi-segmentable cache buffer (see Section 4.5)

• 15k RPM spindle. Average latency = 2.0 ms

• Command queuing of up to 64 commands

• Background processing of queue

• Supports start and stop commands (spindle stops spinning)

3.4 Reliability

• 1,200,000 hour MTBF

• LSI circuitry

• Balanced low mass rotary voice coil actuator

Cheetah X15 36LP Product Manual, Rev. D 7

• Incorporates industry-standard Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.)

• 5-year warranty

3.5 Unformatted and formatted capacities

Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes
per sector. The following table shows the standard OEM model capacities:

Formatted
data block size
512 bytes/sector [1] Unformatted

ST336752 and ST336732 445DCC9h (36.7 GB) [2] 47.5 GB
ST318452 and ST318432 222EE56h (18.4 GB) [2] 23.7 GB

Notes.

[1] Sector size selectable at format time. Users having the necessary equipment may modify the data block

size before issuing a format command and obtain different formatted capacities than those listed. See

Mode Select Command and Format Command in the SCSI Interface Product Manual.

[2] User available capacity depends on spare reallocation scheme selected, the number of data tracks per

sparing zone, and the number of alternate sectors (LBAs) per sparing zone.

3.6 Programmable drive capacity

Using the Mode Select command, the drive can change its capacity to something less than maximum. See the

Mode Select Parameter List table in the SCSI Interface Product Manual. Refer to the Parameter list block

descriptor number of blocks field. A value of zero in the number of blocks field indicates that the drive shall not
change the capacity it is currently formatted to have. A number in the number of blocks field that is less than
the maximum number of LBAs changes the total drive capacity to the value in the block descriptor number of
blocks field. A value greater than the maximum number of LBAs is rounded down to the maximum capacity.

3.7 Factory installed accessories

OEM Standard drives are shipped with the Cheetah X15 36LP Installation Guide, part number 100139875, and
the Safety and Regulatory Agency Specifications, part number 75789512 (unless otherwise specified). The

factory also ships with the drive a small bag of jumper plugs used for the J2, J5, and J6 option select jumper
headers.

3.8 Options (factory installed)

All customer requested options are incorporated during production or packaged at the manufacturing facility
before shipping. Some of the options available are (not an exhaustive list of possible options):

• Other capacities can be ordered depending on sparing scheme and sector size requested.

• Single unit shipping pack. The drive is normally shipped in bulk packaging to provide maximum protection
against transit damage. Units shipped individually require additional protection as provided by the single unit
shipping pack. Users planning single unit distribution should specify this option.

• The Cheetah X15 36LP Installation Guide, part number 100139875, is usually included with each standard

OEM drive shipped, but extra copies may be ordered.

• The Safety and Regulatory Agency Specifications, part number 75789512, is usually included with each

standard OEM drive shipped, but extra copies may be ordered.

3.9 Accessories (user installed)

The following accessories are available. All accessories may be installed in the field.

• Single unit shipping pack.

8 Cheetah X15 36LP Product M anual, Rev. D

4.0 Performance characteristics

4.1 Internal drive characteristics (transparent to user)

ST336752 and
ST336732

ST318452 and
ST318432

Drive capacity 36.7 18.4 GByte (formatted, rounded off values)
Read/write heads 8 4
Bytes/track 316,155 316,155 Bytes (average, rounded off values)
Bytes/surface 5,932.5 5,932.5 Mbytes (unformatted, rounded off values)
Tracks/surface (total) 18,497 18,497 Tracks (user accessible)
Tracks/inch 38,000 38,000 TPI
Peak bits/inch 482 482 KBPI
Internal data rate 548-706 548-706 Mbits/sec (variable with zone)
Disc rotational speed 15k 15k r/min
Average rotational latency 2.0 2.0 msec

4.2 SCSI performance characteristics (visible to user)

The values given in Section 4.2.1 apply to all models of the Cheetah X15 36LP family unless otherwise speci-

fied. Refer to Section 9.10 and to the SCSI Interface Product Manual for additional timing details.

4.2.1 Access time [5]

Including controller overhead
(without disconnect) [1] [3]

Drive level Drive level

Not including controller overhead
(without disconnect) [1] [3]

Read Write Read Write

msec msec
Average – Typical [2] 3.8 4.4 3.6 4.2
Single Track – Typical [2] 0.5 0.6 0.3 0.4
Full Stroke – Typical [2] 7.2 8.2 7.0 8.0

4.2.2 Format command execution time (minutes) [1]

ST336752 and ST336732 ST318452 and ST318432

Maximum (with verify) 90 60
Maximum (no verify) 45 30

4.2.3 Generalized performance characteristics

Minimum sector interleave 1 to 1

Data buffer transfer rate to/from disc media (one 512-byte sector):

Min. [3]* 51.8 MBytes/sec
Max. [3] 68.1 MBytes/sec

SCSI interface data transfer rate (asynchronous):

Maximum instantaneous one byte wide 5.0 Mbytes/sec [4]
Maximum instantaneous two bytes wide 10.0 Mbytes/sec [4]

Synchronous formatted transfer rate Ultra160 SCSI Ultra320 SCSI

In low voltage differential (LVD) interface mode 5.0 to 160 Mbytes/sec 5.0 to 320 Mbytes/sec

Cheetah X15 36LP Product Manual, Rev. D 9

Sector Sizes:

Default 512 byte user data blocks

Variable 512 to 704 bytes per sector in even number of bytes per sector.

If n (number of bytes per sector) is odd, then n-1 will be used.

Read/write consecutive sectors on a track Yes

Flaw reallocation performance impact (for flaws reallocated at format time using
the spare sectors per sparing zone reallocation scheme.)

Average rotational latency 2.00 msec

Notes for Section 4.2.

[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] Typical access times are measured under nominal conditions of temperature, voltage, and horizontal ori-

entation as measured on a representative sample of drives.
[3] Assumes no errors and no sector has been relocated.
[4] Assumes system ability to support the rates listed and no cable loss.
[5] Access time = controller overhead + average seek time.

Access to data = controller overhead + average seek time + latency time.

4.3 Start/stop time

After DC power at nominal voltage has been applied, the drive becomes ready within 20 seconds if the Motor
Start Option is disabled (i.e. the motor starts as soon as the power has been applied). If a recoverable error
condition is detected during the start sequence, the drive executes a recovery procedure which may cause the
time to become ready to exceed 20 seconds. During spin up to ready time the drive responds to some 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 Interface Product Manual).

Negligible

There is no power control switch on the drive.

4.4 Prefetch/multi-segmented cache control

The drive provides prefetch (read look-ahead) and multi-segmented cache control algorithms that in many
cases can enhance system performance. “Cache” as used herein refers to the drive buffer storage space when
it is used in cache operations. To select prefetch and cache features the host sends the Mode Select command

with the proper values in the applicable bytes in Mode Page 08h (see 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 4.5.1 and 4.5.2.

All default cache and prefetch Mode parameter values (Mode Page 08h) for standard OEM versions of this
drive family are given in Tables 8.

4.5 Cache operation

In general, 7,500 kbytes of the physical buffer space in the drive can be used as storage space for cache oper­ations. The buffer can be divided into logical segments (Mode Select Page 08h, byte 13) from which data is
read and to which data is written. The drive supports a maximum of 64 cache segments. The drive maintains a
table of logical block disk medium addresses of the data stored in each segment of the buffer. If cache opera-

tion is enabled (RCD bit = 0 in Mode Page 08h, byte 2, bit 0. See SCSI Interface Product Manual), data

10 Cheetah X15 36LP Product Manual, Rev. D

requested by the host with a Read command is retrieved from the buffer (if it is there), before any disc access
is initiated. If cache operation is not enabled, the buffer (still segmented with required number of segments) is
still used, but only as circular buffer segments during disc medium read operations (disregarding Prefetch
operation for the moment). That is, the drive does not check in the buffer segments for the requested read
data, but goes directly to the medium to retrieve it. The retrieved data merely passes through some buffer seg­ment on the way to the host. On a cache miss, all data transfers to the host are in accordance with buffer-full
ratio rules. On a cache hit the drive ignores the buffer-full ratio rules. See explanations associated with Mode

page 02h (disconnect/reconnect control) in the SCSI Interface Product Manual.

The following is a simplified description of a read operation with cache operation enabled:

Case A - A Read command is received and the first logical block (LB) is already in cache:

1. Drive transfers to the initiator the first LB requested plus all subsequent contiguous LBs that are already in
the cache. This data may be in multiple segments.

2. When the requested LB is reached that is not in any cache segment, the drive fetches it and any remaining
requested LBs from the disc and puts them in a segment of the cache. The drive transfers the remaining
requested LBs from the cache to the host in accordance with the disconnect/reconnect specification men­tioned above.

3. If the prefetch feature is enabled, refer to Section 4.5.2 for operation from this point.

Case B - A Read command requests data, the first LB of which is not in any segment of the cache:

1. The drive fetches the requested LBs from the disc and transfers them into a segment, and from there to
the host in accordance with the disconnect/reconnect specification referred to in case A.

2. If the prefetch feature is enabled, refer to Section 4.5.2 for operation from this point.

Each buffer segment is actually a self-contained circular storage (wrap-around occurs), the length of which is
an integer number of disc medium sectors. The wrap-around capability of the individual segments greatly
enhances the buffer’s overall performance as a cache storage, allowing a wide range of user selectable config­urations, which includes their use in the prefetch operation (if enabled), even when cache operation is disabled
(see Section 4.5.2). The number of segments is set dynamically by the drive and cannot be set by the host.
The size in Kbytes of each segment is not reported by the Mode Sense command page 08h, bytes 14 and 15.
The value 0XFFFF is always reported. If a size specification is sent by the host in a Mode Select command
(bytes 14 and 15) no new segment size is set up by the drive, and if the STRICT bit in Mode page 00h (byte 2,
bit 1) is set to one, the drive responds as it does for any attempt to change unchangeable parameters (see

SCSI Interface Product Manual).

4.5.1 Caching write data

Write caching is a write operation by the drive that makes use of a drive buffer storage area where the data to
be written to the medium is stored in one or more segments while the drive performs the write command.

If read caching is enabled (RCD=0), then data written to the medium is retained in the cache to be made 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 the cache from a previous read or write command. If there are, the
respective cache segments are cleared. The new data is cached for subsequent Read commands.

If the number of write data logical blocks exceeds the size of the segment being written into, when the end of
the segment is reached, the data is written into the beginning of the same cache segment, overwriting the data
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.

Cheetah X15 36LP Product Manual, Rev. D 11

The Synchronize Cache command may be used to force the drive to write all cached write data to the medium.
Upon completion of a Synchronize Cache command, all data received from previous write commands will have
been written to the medium.

Tables 8 show Mode default settings for the drives.

4.5.2 Prefetch operation

If the Prefetch feature is enabled, data in contiguous logical blocks on the disc immediately beyond that which
was requested by a Read command can be retrieved and stored in the buffer for immediate transfer from the
buffer to the host on subsequent Read commands that request those logical blocks (this is true even if cache
operation is disabled). Though the prefetch operation uses the buffer as a cache, finding the requested data in
the buffer is a prefetch hit, not a cache operation hit. Prefetch is enabled using Mode Select page 08h, byte 12,
bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch. Since data that is prefetched replaces
data already in some buffer segment(s), the host can limit the amount of prefetch data to optimize system per­formance. The max prefetch field (bytes 8 and 9) limits the amount of prefetch. The drive does not use the
Prefetch Ceiling field (bytes 10 and 11).

During a prefetch operation, the drive crosses a cylinder boundary to fetch more data only if the Discontinuity
(DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h.

Whenever prefetch (read look-ahead) is enabled (enabled by DRA = 0), it operates under the control of ARLA
(Adaptive Read Look-Ahead). If the host uses software interleave, ARLA enables prefetch of contiguous
blocks from the disc when it senses that a prefetch hit will likely occur, even if two consecutive read operations
were not for physically contiguous blocks of data (e.g., “software interleave”). ARLA disables prefetch when it
decides that a prefetch hit will not likely occur. If the host is not using software interleave, and if two sequential
read operations are not for contiguous blocks of data, ARLA disables prefetch, but as long as sequential read
operations request contiguous blocks of data, ARLA keeps prefetch enabled.

4.5.3 Optimizing cache performance for desktop and server applications

Desktop and server applications require different drive caching operations for optimal performance. This
means it is difficult to provide a single configuration that meets both of these needs. In a desktop environment,
you want to configure the cache to respond quickly to repetitive accesses of multiple small segments of data
without taking the time to “look ahead” to the next contiguous segments of data. In a server environment, you
want to configure the cache to provide large volumes of sequential data in a non-repetitive manner. In this
case, the ability of the cache to “look ahead” to the next contiguous segments of sequential data is a good
thing.

The Performance Mode (PM) bit controls the way the drive switches the cache buffer into different modes of
segmentation. In “server mode” (PM bit = 0), the drive can dynamically change the number of cache buffer
segments as needed to optimize the performance, based on the command stream from the host. In “desktop
mode” (PM bit = 1), the number of segments is maintained at the value defined in Mode Page 8, Byte 13, at all
times (unless changed by using a Mode Select command). For additional information about the PM bit, refer to

the Unit Attention Parameters page (00h) of the Mode Sense command (1Ah) in the SCSI Interface Product
Manual, part number 75789509.

12 Cheetah X15 36LP Product Manual, Rev. D

Cheetah X15 36LP Product Manual, Rev. D 13

5.0 Reliability specifications

The following reliability specifications assume correct host/drive operational interface, including all interface
timings, power supply voltages, environmental requirements and drive mounting constraints (see Section 8.4).

Seek Errors

Less than 10 in 10

Read Error Rates [1]

Recovered Data Less than 10 errors in 10
Unrecovered Data Less than 1 sector in 10

Miscorrected Data Less than 1 sector in 10
MTBF 1,200,000 hours
Service Life 5 years
Preventive Maintenance None required

Note.

[1] Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.

5.1 Error rates

The error rates stated in this specification assume the following:

• The drive is operated per this specification using DC power as defined in this manual (see Section 6.2).

• The drive has been formatted with the SCSI FORMAT command.

• Errors caused by media defects or host system failures are excluded from error rate computations. Refer to
Section 3.2, “Media Characteristics.”

• Assume random data.

8

seeks

12

bits transferred (OEM default settings)

15

bits transferred (OEM default settings)

21

bits transferred

5.1.1 Environmental interference

When evaluating systems operation under conditions of Electromagnetic Interference (EMI), the performance
of the drive within the system shall be considered acceptable if the drive does not generate an unrecoverable
condition.

An unrecoverable error, or unrecoverable condition, is defined as one that:

• Is not detected and corrected by the drive itself;

• Is not capable of being detected from the error or fault status provided through the drive or SCSI interface; or

• Is not capable of being recovered by normal drive or system recovery procedures without operator interven­tion.

5.1.2 Read errors

Before determination or measurement of read error rates:

• The data that is to be used for measurement of read error rates must be verified as being written correctly on
the media.

• All media defect induced errors must be excluded from error rate calculations.

5.1.3 Write errors

Write errors can occur as a result of media defects, environmental interference, or equipment malfunction.
Therefore, write errors are not predictable as a function of the number of bits passed.

If an unrecoverable write error occurs because of an equipment malfunction in the drive, the error is classified
as a failure affecting MTBF. Unrecoverable write errors are those which cannot be corrected within two
attempts at writing the record with a read verify after each attempt (excluding media defects).

5.1.4 Seek errors

A seek error is defined as a failure of the drive to position the heads to the addressed track. There shall be no
more than ten recoverable seek errors in 10

8

physical seek operations. After detecting an initial seek error, the

drive automatically performs an error recovery process. If the error recovery process fails, a seek positioning

14 Cheetah X15 36LP Product Manual, Rev. D

error (15h) is reported with a Medium error (3h) or Hardware error (4h) reported in the Sense Key. This is an
unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculations. Refer to

the SCSI Interface Product Manual, part number 75789509, for Request Sense information.

5.2 Reliability and service

You can enhance the reliability of Cheetah X15 36LP disc drives by ensuring that the drive receives adequate
cooling. Section 6.0 provides temperature measurements and other information that may be used to enhance
the service life of the drive. Section 8.3 provides recommended air-flow information.

5.2.1 Mean time between failure

The production disc drive shall achieve an MTBF of 1,200,000 hours when operated in an environment that
ensures the HDA case temperatures specified in Section 6.4 are not exceeded. Short-term excursions up to
the specification limits of the operating environment will not affect MTBF performance. Continual or sustained
operation at case temperatures above the values shown in Section 6.4.1 may degrade product reliability.

The MTBF target is specified as device power-on hours (POH) for all drives in service per failure.

Estimated power-on operating hours in the period = MTBF per measurement period

Number of drive failures in the period

Estimated power-on operation hours means power-up hours per disc drive times the total number of disc
drives in service. Each disc drive shall have accumulated at least nine months of operation. Data shall be cal­culated on a rolling average base for a minimum period of six months.

MTBF is based on the following assumptions:

• 8,760 power-on hours per year.

• 250 average on/off cycles per year.

• Operations at nominal voltages.

• Systems will provide adequate cooling to ensure the case temperatures specified in Section 6.4.1 are not
exceeded.

Drive failure means any stoppage or substandard performance caused by drive malfunction.

A S.M.A.R.T. predictive failure indicates that the drive is deteriorating to an imminent failure and is considered
an MTBF hit.

5.2.2 Preventive maintenance

No routine scheduled preventive maintenance shall be required.

5.2.3 Service life

The drive shall have a useful service life of five years. Depot repair or replacement of major parts is permitted
during the lifetime (see Section 5.2.4).

5.2.4 Service philosophy

Special equipment is required to repair the drive HDA. In order to achieve the above service life, repairs must
be performed only at a properly equipped and staffed service and repair facility. Troubleshooting and repair of
PCBs in the field is not recommended, because of the extensive diagnostic equipment required for effective
servicing. Also, there are no spare parts available for this drive. Drive warranty is voided if the HDA is opened.

5.2.5 Service tools

No special tools are required for site installation or recommended for site maintenance. Refer to Section 5.2.4.
The depot repair philosophy of the drive precludes the necessity for special tools. Field repair of the drive is not
practical since there are no user purchasable parts in the drive.

Cheetah X15 36LP Product Manual, Rev. D 15

5.2.6 Hot plugging Cheetah X15 36LP disc drives

The SPI-4 standard 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 X15 36LP 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, 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 connect/disconnect operation.

All I/O processes for the SCSI device being inserted or removed shall be quiescent. All SCSI devices on the
bus shall have receivers that conform to the SPI-4 standard.

If the device being hot plugged uses single-ended (SE) drivers and the bus is currently operating in low voltage
differential (LVD) mode, then all I/O processes for all devices on the bus must be completed, and the bus qui­esced, 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 the SPI-4 standard).

The disc drive spindle must come to a complete stop prior to completely removing the drive from the cabinet
chassis. Use of the Stop Spindle command or partial withdrawal of the drive, enough to be disconnected from
the power source, prior to removal are methods for insuring that this requirement is met. During drive insertion,
care should be taken to avoid exceeding the limits stated in Section 6.4.4, "Shock and vibration" in this manual.

5.2.7 S.M.A.R.T.

S.M.A.R.T. is an acronym for Self-Monitoring Analysis and Reporting Technology. This technology is intended
to recognize conditions that indicate a drive failure and is designed to provide sufficient warning of a failure to
allow data back-up before an actual failure occurs.

Note. The firmware will monitor specific attributes for degradation over time but cannot predict instantaneous

drive failures.

Each attribute has been selected to monitor a specific set of failure conditions in the operating performance of
the drive, and the thresholds are optimized to minimize “false” and “failed” predictions.

Controlling S.M.A.R.T.

The operating mode of S.M.A.R.T. is controlled by the DEXCPT bit and the PERF bit of the “Informational
Exceptions Control Mode Page” (1Ch). The DEXCPT bit is used to enable or disable the S.M.A.R.T. process.
Setting the DEXCPT bit will disable all S.M.A.R.T. functions. When enabled, S.M.A.R.T. will collect on-line data
as the drive performs normal read/write operations. When the PERF bit is set, the drive is considered to be in
“On-line Mode Only” and will not perform off-line functions.

16 Cheetah X15 36LP Product Manual, Rev. D

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 time remaining before the next scheduled 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 the disc is uninterruptable and
the maximum delay is summarized below:

Maximum processing delay

On-line only delay Fully enabled delay
DEXCPT = 0, PERF = 1DEXCPT = 0, PERF = 0

S.M.A.R.T. delay times50 milliseconds300 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 rates of
error is to set thresholds for the number of errors and the interval. If the number of errors exceeds the threshold
before the interval expires, then the error rate is considered to be unacceptable. If the number of errors does
not exceed the threshold before the interval expires, then the error rate is considered to be acceptable. In
either case, the interval and failure counters are reset and the process starts over.

Predictive failures

S.M.A.R.T. signals predictive failures when the drive is performing unacceptably for a period of time. The firm­ware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accom­plish this, a counter is incremented whenever the error rate is unacceptable and decremented (not to exceed
zero) whenever the error rate is acceptable. Should the counter continually be incremented such that it
reaches the predictive threshold, a predictive failure is signaled. This counter is referred to as the Failure His­tory Counter. There is a separate Failure History Counter for each attribute.

5.2.8 Thermal Monitor

Cheetah X15 36LP 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 temperature value.

Cheetah X15 36LP Product Manual, Rev. D 17

A temperature sensor monitors the drive temperature and issues a warning over the interface when the tem­perature exceeds a set threshold. The temperature is measured at power-up and then at ten-minute intervals
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 implements two temperature trip points. The first trip point is set at 65°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 65°C, however, you can set it to any value in the
range of 0 to 65°C. If you specify a temperature greater than 65°C in this field, the temperature is rounded
down to 65°C. A sense code is sent to the host to indicate the rounding of the parameter field.

Table 2: Temperature 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.

5.2.9 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 drive and scans every logical
block address (LBA) of the drive. The short test is time-restricted and limited in length—it does not scan the
entire media surface, but does some fundamental tests and scans portions of the media.

If DST encounters an error during either of these tests, it reports a fault condition. If the drive fails the test,
remove it from service and return it to Seagate for service.

5.2.9.1 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.

18 Cheetah X15 36LP Product Manual, Rev. D

5.2.9.2 Implement ation

This section provides all of the information necessary to implement the DST function on this drive.

5.2.9.2.1 State of the drive prior to testing

The drive must be in a ready state before issuing the Send Diagnostic command. There are multiple reasons
why a drive may not be ready, some of which are valid conditions, and not errors. For example, a drive may be
in process of doing a format, or another DST. It is the responsibility of the host application to determine the “not
ready” cause.

While not technically part of DST, a Not Ready condition also qualifies the drive to be returned to Seagate as a
failed drive.

A Drive Not Ready condition is reported by the drive under the following conditions:

• Motor will not spin

• Motor will not lock to speed

• Servo will not lock on track

• Drive cannot read configuration tables from the disc

In these conditions, the drive responds to a Test Unit Ready command with an 02/04/00 or 02/04/03 code.

5.2.9.2.2 Invoking DST

To invoke DST, submit the Send Diagnostic command with the appropriate Function Code (001b for the short
test or 010b for the extended test) in bytes 1, bits 5, 6, and 7. Refer to the Seagate SCSI Interface Manual, part
number 75789509, for additional information about invoking DST.

5.2.9.2.3 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.

Short test (Function Code: 001b)

The purpose of the short test is to provide a time-limited test that tests as much of the drive as possible within
120 seconds. The short test does not scan the entire media surface, but does some fundamental tests and
scans portions of the media. A complete read/verify scan is not performed and only factual failures will report a
fault condition. This option provides a quick confidence test of the drive.

Extended test (Function Code: 010b)

The objective of the extended test option is to empirically test critical drive components. For example, the seek
tests and on-track operations test the positioning mechanism. The read operation tests the read head element
and the media surface. The write element is tested through read/write/read operations. The integrity of the
media is checked through a read/verify scan of the media. Motor functionality is tested by default as a part of
these tests.

The anticipated length of the Extended test is reported through the Control Mode page.

5.2.9.2.4 Log page entries

When the drive begins DST, it creates a new entry in the Self-test Results Log page. The new entry is created
by inserting a new self-test parameter block at the beginning of the self-test results log parameter section of
the log page. Existing data will be moved to make room for the new parameter block. The drive reports 20

Cheetah X15 36LP Product Manual, Rev. D 19

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 Self­Test Results Log page in non-volatile memory. The host may use Log Sense to read the results from up to the
last 20 self-tests performed by the drive. The self-test results value is a 4-bit field that reports the results of the
test. If the field is zero, the drive passed with no errors detected by the DST. If the field is not zero, the test
failed for the reason reported in the field.

The drive will report the failure condition and LBA (if applicable) in the Self-test Results Log parameter. The
Sense key, ASC, ASCQ, and FRU are used to report the failure condition.

5.2.9.2.5 Abort

There are several ways to abort a diagnostic. You can use a SCSI Bus Reset or a Bus Device Reset message
to abort the diagnostic.

You can abort a DST executing in background mode by using the abort code in the DST Function Code field.
This will cause a 01 (self-test aborted by the application client) code to appear in the self-test results values
log. All other abort mechanisms will be reported as a 02 (self-test routine was interrupted by a reset condition).

5.2.10 Product warranty

Beginning on the date of shipment to customer and continuing for a period of five years, Seagate warrants that
each product (including components and subassemblies) or spare part that fails to function properly under nor­mal use due to defect in materials 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.

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.

20 Cheetah X15 36LP Product Manual, Rev. D

Cheetah X15 36LP Product Manual, Rev. D 21

6.0 Physical/electrical specifications

This section provides information relating to the physical and electrical characteristics of the Cheetah X15
36LP drive.

6.1 AC power requirements

None.

6.2 DC power requirements

The voltage and current requirements for a single drive are shown in the following table. Values indicated apply
at the drive power connector. The table shows current values in Amperes.

Table 3: DC power requirements

Notes

ST336752 and ST336732 ST318452 and ST318432

SE mode LVD mode SE mode LVD mode

Voltage +5 V +12 V +5 V +12 V +5 V +12 V +5 V +12 V

Regulation [5] ±5% ±5%[2] ±5% ±5% [2] ±5% ±5%[2] ±5% ±5%[2]

Average idle current DC X

[1][7] 0.78 0.68 0.83 0.68 0.78 0.51 0.83 0.51

Maximum starting current

(peak DC) DC
(peak AC) AC 3σ

Delayed motor start (max) DC

3σ

[3]
[3]

3σ [1] [4] 0.68 0.03 0.73 0.03 0.69 0.03 0.74 0.03

0.83

1.16

1.73

3.33

0.92

1.22

1.73

3.33

0.87

1.21

1.44

2.51

0.90

1.18

1.44

2.51

Peak operating current

DC X
Maximum DC 3σ
Maximum (peak) DC 3σ

[1][6]
[1]

0.81

0.85

1.25

0.98

1.23

2.25

0.89

0.93

1.55

0.98

1.23

2.25

0.79

0.84

1.18

0.79

0.99

2.32

0.88

0.93

1.44

0.79

0.99

2.32

[1] Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks

will exceed these values. Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C
ambient.

[2] For +12 V, a –10% tolerance is permissible during initial start of spindle, and must return to ±5% before

15,000 rpm is reached. The ±5% must be maintained after the drive signifies that its power-up sequence

has been completed and that the drive is able to accept selection by the host initiator.
[3] See +12 V current profile in Figure 2.
[4] This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start

Motor command.
[5] See Section 6.2.1 “Conducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,

and transient response.
[6] Operating condition is defined as random 8 block reads at 282 I/Os per second (284 I/Os per second for

ST318452 models). Current and power specified at nominal voltages. Decreasing +5 volts by 5% increases

5 volt current by 3.2%. Decreasing +12 volt supply by 5% increases 12 volt current by 1.4% (2% for

ST318452 models).

[7] 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 from Table 3:

1. Minimum current loading for each supply voltage is not less than 1.7% of the maximum operating current

shown.

2. The +5 and +12 volt supplies shall employ separate ground returns.

3. Where power is provided to multiple drives from a common supply, careful consideration for individual

drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak
starting current must be available to each device.

4. Parameters, other than spindle start, are measured after a 10-minute warm up.

5. No terminator power.

22 Cheetah X15 36LP Product Manual, Rev. D

6.2.1 Conducted noise immunity

Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz.
Maximum allowed noise values given below are peak to peak measurements and apply at the drive power con­nector.

+5 V = 150 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz.

+12 V = 150 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz.

6.2.2 Power sequencing

The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down. Daisy-chain operation requires that power be maintained on the SCSI bus terminator to ensure
proper termination of the peripheral I/O cables. To automatically delay motor start based on the target ID (SCSI
ID) enable the Delay Motor Start option and disable the Enable Motor Start option on the J2 connector. See
Section 8.1 for pin selection information. To delay the motor until the drive receives a Start Unit command,
enable the Enable Remote Motor Start option on the J2 connector.

6.2.3 12 V - Current profile

Figure 2 identifies the drive +12 V current profile. The current during the various times is as shown:

T0 - Power is applied to the drive.
T1 - Controller self tests are performed.
T2 - Spindle begins to accelerate under current limiting after performing drive internal

diagnostics. See Note 1 of Table 2.
T3 - The spindle is up to speed and the head-arm restraint is unlocked.
T4 - The adaptive servo calibration sequence is performed.
T5 - Calibration is complete and drive is ready for reading and writing.

Note. All times and currents are typical. See Table 3 for maximum current requirements.

+12 Volt Current during spindle start — Typical Amperes

AC Envelope

2.5

2.0

A

1.5

1.0

0.5

0.0

T0 T1 T3 T4

T2

DC average of waveform

0.0 2 4 6 8 10 12 14 16

Seconds

Figure 2. Typical ST336752 and ST336732 drive +12 V current profile

Cheetah X15 36LP Product Manual, Rev. D 23

+5 Volt Current during spindle start — Typical Amperes

1.5

Amps

1.0

0.5

AC Envelope

0.0

T2 T4T1T0 T3 T5

Nominal (average) DC curve

0.0 4 8 12 16 20 24 28 32

Seconds

Figure 3. Typical ST336752 and ST336732 drive +5 V current profile

+12 Volt Current during spindle start — Typical Amperes

2.5

2.0

A

1.5

1.0

0.5

AC Envelope

DC average of waveform

0.0

T0 T1 T3 T4

T2

0.0 2 4 6 8 10 12 14 16

Seconds

Figure 4. Typical ST318452 and ST318432 drive +12 V current profile

24 Cheetah X15 36LP Product Manual, Rev. D

+5 Volt Current during spindle start — Typical Amperes

1.5

A

1.0

0.5

0.0

T2 T4T1T0 T3 T5

0.0 4 8 12 16

Seconds

Nominal (average) DC curve

20 24 28

Figure 5. Typical ST318452 and ST318432 drive +5 V current profile

AC Envelope

32

Cheetah X15 36LP Product Manual, Rev. D 25

6.3 Power dissipation ST336752 and

ST336732

For drives using single-ended interface circuits, typical power dissipation under idle conditions is 12.1 watts
(41.3 BTUs per hour).

For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 12.3
watts (42.0 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 6 and 7). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the cor­responding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour,
multiply watts by 3.4123.

1.800

1.600

1.400

1.200

1.000

Amperes

0.800

5V A

16.0

14.0

12.0

10.0

8.0

12V A
Watts

Watts

0.600

0.400

0 50 100

I/Os per Second

Figure 6. ST336752 and ST336732 DC current and power vs. IOPS (SE)

1.800

1.600

1.400

1.200

1.000

Amperes

0.800

0.600

150 300

200 250

16.0

14.0

12.0

10.0

8.0

6.0

6.0

4.0

5V A
12V A
Watts

Watts

0.400

0 50 100

Figure 7. ST336752 and ST336732 DC current and power vs. IOPS (LVD)

150 300

I/Os per Second

200 250

4.0

26 Cheetah X15 36LP Product Manual, Rev. D

ST318452 and ST318432

For drives using single-ended interface circuits, typical power dissipation under idle conditions is 10.0 watts
(34.15 BTUs per hour).

For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 10.3
watts (35.18 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 6 and 7). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the cor­responding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour,
multiply watts by 3.4123.

1.800

1.600

1.400

1.200

1.000

Amperes

0.800

0.600

0.400

0 50 100

150 300

I/Os per Second

200 250

Figure 8. ST318452 and ST318432 DC current and power vs. IOPS (SE)

1.800

1.600

5V A
12V A
Watts

14.0

12.0

10.0

Watts

8.0

6.0

4.0

5V A
12V A
Watts

1.400

1.200

1.000

Amperes

0.800

0.600

0.400

0 50 100

150 300

200 250

I/Os per Second

Figure 9. ST318452 and ST318432 DC current and power vs. IOPS (LVD)

14.0

12.0

10.0

Watts

8.0

6.0

4.0

Cheetah X15 36LP Product Manual, Rev. D 27

6.4 Environmental limits

Temperature and humidity values experienced by the drive must be such that condensation does not occur on
any drive part. Altitude and atmospheric pressure specifications are referenced to a standard day at 58.7°F
(14.8°C). Maximum wet bulb temperature is 82°F (28°C).

6.4.1 Temperature

a. Operating

With cooling designed to maintain the case temperatures, the drive meets all specifications over a 41°F to
131°F (5°C to 55°C) drive ambient temperature range with a maximum temperature gradient of 36°F (20°C)
per hour. The enclosure for the drive should be designed such that the temperatures are not exceeded. Air
flow may be needed to achieve these temperature values (see Section 8.3). Operation at case tempera­tures above these values may adversely affect the drives ability to meet specifications.

The MTBF specification for the drive is based on operating in an environment that ensures that the case
temperatures are not exceeded. Occasional excursions to drive ambient temperatures of 122°F (50°C) or
41°F (5°C) may occur without impact to specified MTBF. Air flow may be needed to achieve these tempera­tures. Continual or sustained operation at case temperatures above these values may degrade MTBF. The
maximum allowable continuous or sustained HDA case temperature for the rated MTBF is 122°F (50°C)

To confirm that the required cooling for the electronics and HDA is provided, place the drive in its final
mechanical configuration, perform random write/read operations. After the temperatures stabilize, measure
the HDA case temperature of the drive.

The maximum allowable HDA case temperature is 60°C. Operation of the drive at the maximum case tem­perature is intended for short time periods only. Continuous operation at the elevated temperatures will
reduce product reliability.

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 container designed by Seagate for use
with drive.

HDA Temperature

Check Point

.5"

2.0"

Figure 10. Locations of the HDA temperature check point

6.4.2 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 20% per hour.

b. Non-operating

5% to 95% non-condensing relative humidity.

6.4.3 Effective altitude (sea level)

a. Operating

–1,000 to +10,000 feet (–305 to +3,048 meters)

28 Cheetah X15 36LP Product Manual, Rev. D

b. Non-operating

–1,000 to +40,000 feet (–305 to +12,210 meters)

6.4.4 Shock and vibration

Shock and vibration limits specified in this document are measured directly on the drive chassis. If the drive is
installed in an enclosure to which the stated shock and/or vibration criteria is applied, resonances may occur
internally to the enclosure resulting in drive movement in excess of the stated limits. If this situation is appar­ent, it may be necessary to modify the enclosure to minimize drive movement.

The limits of shock and vibration defined within this document are specified with the drive mounted by any of
the four methods shown in Figure 11, and in accordance with the restrictions of Section 8.4. Orientation of the
side nearest the LED may be up or down.

6.4.4.1 Shock

a. Operating—normal

The drive, as installed for normal operation, shall operate error free while subjected to intermittent shock
not exceeding 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 15 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 sinewave). Shock occurring at
abnormal levels may promote degraded operational performance during the abnormal shock period. Speci­fied 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 nonrepetitve shock not exceeding 100 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 height

<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)

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.

Cheetah X15 36LP Product Manual, Rev. D 29

Z

Y

X

Figure 11. Recommended mounting

X

Z

Y

30 Cheetah X15 36LP Product Manual, Rev. D

6.4.4.2 Vibration

a. Operating - normal

The drive as installed for normal operation, shall comply with the complete specified performance while
subjected to continuous vibration not exceeding

5-500 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 - 400 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

5-500 Hz @ 0.75 G (X, Y, or Z axis, zero to peak)

Vibration occuring at these levels may degrade operational performance during the abnormal vibration
period. Specified operational performance will continue when normal operating vibration levels are
resumed. This assumes system recovery routines are available.

Operating abnormal translational random flat profile

10 - 400 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

5-22 Hz @ 0.040 inches (1.02 mm) displacement (zero to peak)
22-500 Hz @ 2.00 G (zero to peak)

Vibration may be applied in the X, Y, or Z axis.

Non-operating translational random flat profile

10 - 400 Hz 1.2 GRMS

6.4.5 Air cleanliness

The drive is designed to operate in a typical office environment with minimal environmental control.

6.4.6 Acoustics

Sound power during idle mode shall be 3.7 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.

6.4.7 Electromagnetic susceptibility

See Section 2.1.2.

Cheetah X15 36LP Product Manual, Rev. D 31

6.5 Mechanical specifications

The following nominal dimensions are exclusive of the decorative front panel accessory. However, dimensions
of the front panel are shown in figure below. Refer to Figures 12 and 13 for detailed mounting configuration
dimensions. See Section 8.4, “Drive mounting.”

Height: 1.000 in 25.4 mm
Width: 4.000 in 101.6 mm
Depth: 5.75 in 146.05 mm
Weight: 1.8 pounds 0.816 kilograms

K

S

-Z-

-Z-T//

A

M

[1]

L

H

B

C

J

R

-Z-

Notes:

Mounting holes are 6-32 UNC 2B, three

[1]

on each side and four on the bottom.
Max screw penetration into side of drive
is 0.15 in. (3.81 mm). Max screw
tightening torque is 8.0 in-lb (4.43 nm)
with minimum full thread engagement of

0.12 in. (3.05 mm).

-X-U

P

G

F

[1]

E

D

-X-

Figure 12. LW mounting configuration dimensions

Dimension Table

Inches

A

1.028

5.787

4.000

3.750
.125

1.750

1.625

1.122

4.000
.250

1.638
.181

1.625
.265
.315
.015
.015

max
max

– .010
– .010
– .010
– .010
– .020
– .020
– .010
– .010
– .010
– .020
– .020
– .010
– .040

max
max

B
C
D
E
F
G
H

J
K
L

M

P
R
S
T
U

Millimeters

26.10

147.00

101.60

92.25

3.18

44.45

41.28

28.50

101.60

6.35

41.60

4.60

41.28

6.73

7.00

0.38

0.38

max
max
– .25

– .25

– .25

– .25
– .50
– .50
– .25
– .25
– .25
– .50
– .50
– .25
– 1.02

max
max

32 Cheetah X15 36LP Product Manual, Rev. D

K

S

-Z-

-Z-T//

A

M

[1]

L

H

B

R

-Z- -X-N

C

J

-Z-

Notes:

Mounting holes are 6-32 UNC 2B, three

[1]

on each side and four on the bottom.
Max screw penetration into side of drive
is 0.15 in. (3.81 mm). Max screw
tightening torque is 8.0 in-lb (4.43 nm)
with minimum full thread engagement of

0.12 in. (3.05 mm).

-X-

U

P

F

[1]

E

D

-X-

Figure 13. LC 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

N

.040

P

1.625

R

2.618

S

.276

T

.015

U

.015

Dimension Table

Inches

max
max

– .010
– .010
– .010
– .010
– .020
– .010
– .010
– .010
– .020

max

– .020
– .010
– .040

max
max

26.10

147.00

101.60

92.25

44.45

28.50

101.60

41.60

41.28

66.50

Millimeters

max
max
– .25

– .25

3.18

– .25

– .25
– .50
– .25

6.35

– .25
– .25

4.60

– .50

1.20

max

– .50
– .25

7.00

– 1.02

0.38

max

0.38

max

Cheetah X15 36LP Product Manual, Rev. D 33

7.0 Defect a nd error management

The drive, as delivered, complies with this specification. The read error rate and specified storage capacity are
not dependent upon use of defect management routines by the host (initiator).

Defect and error management in the SCSI system involves the drive internal defect/error management and
SCSI systems error considerations (errors in communications between Initiator and the drive). Tools for use in
designing a defect/error management plan are briefly outlined in this section, with references to other sections
where further details are given.

7.1 Drive internal defects

During the initial drive format operation at the factory, media defects are identified, tagged as being unusable,
and their locations recorded on the drive primary defects list (referred to as the “P” list and also as the ETF
defect list). At factory format time, these known defects are also reallocated, that is, reassigned to a new place
on the medium and the location listed in the defects reallocation table. The “P” list is not altered after factory
formatting. Locations of defects found and reallocated during error recovery procedures after drive shipment
are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator using the

Read Defect Data command (see the SCSI Interface Product Manual).

7.2 Drive error recovery procedures

Whenever an error occurs during drive operation, the drive, if programmed to do so, performs error recovery
procedures to attempt to recover the data. The error recovery procedures used depend on the options 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 addi-

tional information on this, refer to the Error Recovery Page table in the SCSI Interface Product Manual, which

describes the Mode Select/Mode Sense Error Recovery parameters.

The error recovery scheme supported by the drive provides a means to control the total error recovery time for
the entire command in addition to controlling the recovery level for a single LBA. The total amount of time spent
in error recovery for a command can be limited via the Recovery Time Limit bytes in the Error Recovery Mode
Page. The total amount of time spent in error recovery for a single LBA can be limited via the Read Retry
Count or Write Retry Count bytes in the Error Recovery Mode Page.

The drive firmware error recovery algorithms consist of 11 levels for read recoveries and 5 levels for writes.

Table 4 equates the Read and Write Retry Count with the maximum possible recovery time for read and write
recovery of individual LBAs. The times given do not include time taken to perform reallocations, if reallocations
are performed. Reallocations are performed when the ARRE bit (for reads) or AWRE bit (for writes) is one, the
RC bit is zero, and the Recovery Time Limit for the command has not yet been met. Time needed to perform
reallocation is not counted against the Recovery Time Limit.

The Read Continuous (RC) bit, when set to one, requests the disc drive to transfer the requested data length
without adding delays (for retries or ECC correction) that may be required to insure data integrity. The disc
drive may send erroneous data in order to maintain the continuous flow of data. The RC bit should only be
used when data integrity is not a concern and speed is of utmost importance. If the Recovery Time Limit or
retry count is reached during error recovery, the state of the RC bit is examined. If the RC bit is set, the drive
will transfer the unrecovered data with no error indication and continue to execute the remaining command. If
the RC bit is not set, the drive will stop data transfer with the last good LBA, and report a “Check Condition,
Unrecovered Read Error.”

34 Cheetah X15 36LP Product Manual, Rev. D

Table 4: Read and write retry count maximum recovery times [1]

Read retry
count [1]

0 52.0 0 35.8

1 60.0 1 53.7

2 203.9 2 59.7

3 220.0 3 113.6

4 243.9 4 227.1

5 275.9 5 (default) 268.9

6 347.8

7 355.8

8 371.8

9 407.8

10 433.5

11 (default) 1,033.1

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 244 msec recovery time for each of the four LBAs in the
command. If the recovery time limit is set to 00 C8 hex (200 msec decimal) a four LBA read command is
allowed to take up to 200 msec for all error recovery within that command. The use of the Recovery Time
Limit field allows finer granularity on control of the time spent in error recovery. The recovery time limit
only starts counting when the drive is executing error recovery and it restarts on each command. There­fore, each command’s total recovery time is subject to the recovery time limit. Note: A recovery time limit
of 0 will use the drive’s default value of FF FF. Minimum recovery time limit is achieved by setting the
Recovery Time Limit field to 00 01.

7.3 SCSI systems errors

Information on the reporting of operational errors or faults across the interface is given in the SCSI Interface
Product Manual. 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 Interface Product Manual. Status reporting

plays a role in the SCSI systems error management and its use in that respect is described in sections where
the various commands are discussed.

Cheetah X15 36LP Product Manual, Rev. D 35

8.0 Installation

Note. These drives are designed to be used only on single-ended (SE) or low voltage differential (LVD) bus-

ses. Do not install these drives on a high voltage differential (HVD) bus.

The first thing to do when installing a drive is to set the drive SCSI ID and set up certain operating options. This
is usually done by installing small shorting jumpers on the pins of connectors J2 and J6 on the PCBA (or J1­Auxiliary on the LW model), or via the drive to host I/O signals on the LC model. Some users connect cables to
J6 or J5-Auxiliary and perform the set-up using remote switches.

Configure drive options

For option jumper locations and definitions refer to Figures 14, 15, and 16. Drive default mode parameters are
not normally needed for installation. Refer to Section 9.3.2 for default mode parameters if they are needed.

• Ensure that the SCSI ID of the drive is not the same as the host adapter. Most host adapters use SCSI ID 7
because ID 7 is the highest priority on both 8 and 16 bit data buses.

• If multiple devices are on the bus set the drive SCSI ID to one that is not presently used by other devices on
the bus.

• If the drive is the only device on the bus, attach it to the end of the SCSI bus cable. The user, system integra­tor, or host equipment manufacturer must provide external terminators.

Note. For additional information about terminator requirements, refer to Sections 9.8 and 9.9.

• 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 additionally purchased drive
installation software. If necessary see Section 10 for Seagate support services telephone numbers.

• Do not remove the manufacturer’s installed labels from the drive and do not cover with additional labels, as
the manufacturer labels contain information required when servicing the product.

Formatting

• It is not necessary to low level format this drive. The drive is shipped from the factory low level formatted in
512 byte sectors.

• Reformat the drive if a different spare sector allocation scheme is selected.

• High level formatting the drive involves assigning one or more partitions or logical drives to the drive volume.

Follow the instructions in the system manuals for the system into which the drive is to be installed.

8.1 Drive ID/option select header

Figures 14 and 15 show views of the drive ID select jumper connectors. Figure 16 shows the option select
jumper connector for all models. Figure 14 shows the drive’s J5-auxiliary jumper connector. Both J5-auxiliary
and J6 have pins for selecting drive ID and for connecting the remote LED cable. Only one or the other should
be used, although using both at the same time would not damage the drive. The notes following the figures
describe the functions of the various jumper positions on the connectors J2, J5-Auxiliary and J6. Suggested
part number for the jumpers used on J2 is Molex 52747-0211 (Seagate part number 77679052). A bag with the
two jumper plug types is shipped with the standard OEM drives.

36 Cheetah X15 36LP Product Manual, Rev. D

Drive
Front

Jumper Plug

(enlarged to
show detail)

Pin 1

[1] [5]

J6

R

Reserved

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

[2]

SCSI ID = 8

SCSI ID = 9

SCSI ID = 10

SCSI ID = 11

SCSI ID = 12

SCSI ID = 13

SCSI ID = 14

SCSI ID = 15

[4]

Host
Alternate

Reserved

Pins [5]

Usage Plug:

+5V

[6]

L

E

E

A2A1A

A

3

S

D

11 9 7 5 3 1

6842

Ground

0

Shipped with cover installed.
Do not install jumpers; retain cover.

Dashed area is optional host circuitry (external to the drive)

[4]

connected to host supplied optional usage plug.

[5]

Do not connect anything to pins 13-20.

Figure 14. J6 jumper header

Drive Activity LED

Cheetah X15 36LP Product Manual, Rev. D 37

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

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.

PCB

Figure 15. J5 jumper header (on LW models only)

38 Cheetah X15 36LP Product Manual, Rev. D

J2

Pin 1

Jumper

LW Models

Force single-ended bus mode

Delay Motor Start

Enable Remote Motor Start

Term. Power to SCSI Bus

Jumper Plug

(enlarged to
show detail)

Positions

Write Protect

Parity Disable

No connection

J2

SEDSMEWPPDNCNCT

P

Drive
Front

*Additional notes on these

functions in section 8.1.2.

Figure 16. J2 option select header (on LW models only)

8.1.1 Notes for Figures 14, 15, and 16.

Jumper

LC Models

Force single-ended bus mode

J2

J6

Positions

Write Protect

No connection

J2

SENCNCWPNCNCNCN

Pin 1

C

[1] Notes explaining the functions of the various jumpers on jumper header connectors J2, J5, and J6 are

provided in Section 8.1.2. The term “default” indicates how standard OEM units are configured when

shipped from factory. “Off” means the jumper is not installed; “On” means a jumper is installed. OFF or ON

underlined indicates the factory default condition.

The PCBA on LC models does not have connector J5. The J5 connector signals conform to SFF-8009
Revision 2.0, Unitized Connector for Cabled Drives, signal assignments for auxiliary connectors.

[2] These signals are also on the 80-pin J1 I/O connector. See Tables 18 and 19.

[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] Connect an external Drive Activity LED to J6 pins 11 and 12, or to J5 pin 8 and the drive’s +5V power

source, through an appropriately-sized current-limiting resistor. The drive provides an internal 150 ohm
current-limiting resistor for the J6 connection.

Cheetah X15 36LP Product Manual, Rev. D 39

8.1.2 Function description

J2
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.

DS ME (Does not apply to LC models)

Off

Off Spindle starts immediately after power up. Default.

Off On Drive spindle does not start until the Start Unit command received from the host.
On Off Spindle startup is delayed by the SCSI ID times 12 seconds after power is applied, i.e., the

drive assigned SCSI ID 0 spindle starts immediately when DC power is connected, a drive
assigned SCSI ID 1 starts after 12-second delay, and a drive assigned SCSI ID 2 starts after
24-second delay, etc.

On On Drive spindle starts when the Start Unit command is received from the host. The Delayed

Start feature is overridden and does not apply when the ME jumper is installed.

WP

On Entire drive is write protected.
Off

Drive is not write protected. Default.

PD (Does not apply to LC models)

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.

NC

Off

No connection. Default.

TP (Does not apply to LC models)

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 TP1 position may be needed to power external terminators (see system docu-

mentation). These drives do not have terminator circuits on the drive.

40 Cheetah X15 36LP Product Manual, Rev. D

8.2 Drive orientation

The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. 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.

8.3 Cooling

Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding
the drive will not exceed temperature conditions specified in Section 6.4.1, “Temperature.”

The rack, cabinet, or drawer environment for the drive must provide heat removal from the electronics and
head and disc assembly (HDA). You should confirm that adequate heat removal is provided using the temper­ature measurement guidelines described in Section 6.4.1.

Forced air flow may be required to keep temperatures at or below the temperatures specified in Section 6.4.1 in
which case the drive should be oriented, or air flow directed, so that the least amount of air flow resistance is
created while providing air flow to the electronics and HDA. Also, the shortest possible path between the air
inlet and exit should be chosen to minimize the travel length of air heated by the drive and other heat sources
within the rack, cabinet, or drawer environment.

If forced air is determined to be necessary, possible air-flow patterns are shown in Figure 17. The air-flow pat­terns are created by one or more fans, either forcing or drawing air as shown in the illustrations. Conduction,
convection, or other forced air-flow patterns are acceptable as long as the temperature measurement guide­lines of Section 6.4.1 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 17. Air flow (suggested)

Above unit

Under unit

Above unit

Under unit

Cheetah X15 36LP Product Manual, Rev. D 41

8.4 Drive mounting

When mounting the drive using the bottom holes (x-y plane in Figure 11) 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 (units of lb/in or N/mm), and ‘x’ represents the out-of-plane
mounting surface distortion (units of inches or millimeters). The out-of-plane distortion (‘x’) is determined by
defining a plane with three of the four mounting points fixed and evaluating the out-of-plane deflection of the
fourth mounting point when a known force (F) is applied to the fourth point.

Note. Before mounting the drive in any kind of 3.5-inch to 5.25-inch adapter frame, verify with Seagate Tech-

nology that the drive can meet the shock and vibration specifications given herein while mounted in
such an adapter frame. Adapter frames that are available may not have a mechanical structure capa­ble of mounting the drive so that it can meet the shock and vibration specifications listed in this man­ual.

8.5 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.

42 Cheetah X15 36LP Product Manual, Rev. D

Cheetah X15 36LP Product Manual, Rev. D 43

9.0 Interface requirements

This section partially describes the interface requirements as implemented on the drives.

9.1 General description

This section describes in essentially general terms the interface requirements supported by the Cheetah X15
36LP. 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 SCSI Interface Product Manual.

9.2 SCSI interface messages supported

Table 5 lists the messages supported by Cheetah X15 36LP family drives.

Table 5: SCSI messages supported by Cheetah X15 36LP family drives

Supported by
ST336752 and

Message name Message code

ST318452 models

Abort 06h Y Y
Abort-tag 0Dh Y Y
Bus device reset 0Ch Y Y
Clear ACA 16h N N
Clear queue 0Eh Y Y
Command complete 00h Y Y
Continue I/O process 12h N N
Disconnect 04h Y Y
Extended messages 01h[1] Y Y
Identify 80h-FFh Y Y
Ignore wide residue (two bytes) 23h Y Y
Initiate recovery 0Fh N N
Initiator detected error 05h Y Y
Linked command complete 0Ah Y Y
Linked command complete with flag 0Bh Y Y
Message parity error 09h Y Y
Message reject 07h Y Y
Modify data pointer [1] N N
No operation 08h Y Y

Parallel Protocol Request Y [1] [2] Y

Queue tag messages (two bytes)

ACA 24h N N
Head of queue tag 21h Y Y
Ordered queue tag 22h Y Y

Simple queue tag 20h Y Y
Quick Arbitration and Selection (QAS) 55h N Y
Release recovery 10h N N
Restore pointers 03h Y Y
Save data pointer 02h Y Y
Synchronous data transfer req. [1] Y Y
Target transfer disable 13h N N
Terminate I/O process 11h N N
Wide data transfer request [1] Y Y

Supported by
ST336732 and
ST318432 models

44 Cheetah X15 36LP Product Manual, Rev. D

Notes.

[1] Extended messages (see the SCSI Interface Product Manual).

[2] Supports all options except qas_req and iu_req.

9.3 SCSI interface commands supported

Table 6 following lists the SCSI interface commands that are supported by the drive.

ST336752 and ST318452 OEM standard drives are shipped set to operate in Ultra160 mode.
ST336732 and ST318432 OEM standard drives are shipped set to operate in Ultra320 mode.

Table 6: Commands supported by Cheetah X15 36LP family drive

Supported by

Command name

Command
code

ST336752 and
ST318452 models

Change Definition 40h N N
Compare 39h N N
Copy 18h N N
Copy and Verify 3Ah N N
Format Unit [1] 04h Y Y
DPRY bit supported N N
DCRT bit supported Y Y
STPF bit supported Y Y
IP bit supported Y Y
DSP bit supported Y Y
IMMED bit supported Y Y
VS (vendor specific) N N
Inquiry 12h Y Y

Date Code page (C1h) Y Y

Device Behavior page (C3h) Y Y

Firmware Numbers page (C0h) Y Y
Implemented Operating Def page (81h) Y Y
Jumper Settings page (C2h) Y Y
Supported Vital Product Data page (00h) Y Y

Unit Serial Number page (80h) Y Y
Lock-unlock cache 36h N N
Log Select 4Ch Y Y

PCR bit Y Y

DU bit N N

DS bit Y Y

TSD bit Y Y

ETC bit N N

TMC bit N N

LP bit N N
Log Sense 4Dh Y Y

Application Client Log page (0Fh) Y Y
Buffer Over-run/Under-run page (01h) N N

Cache Statistics page (37h) Y Y
Factory Log page (3Eh) Y Y
Last n Deferred Errors or Asynchronouse Events

NN

page (0Bh)
Last n Error Events page (07h) N N

Non-medium Error page (06h) Y Y

Pages Supported list (00h) Y Y

Supported by
ST336732 and
ST318432 models

Cheetah X15 36LP Product Manual, Rev. D 45

Table 6: Commands supported by Cheetah X15 36LP family drive (Continued)

Command name

Command
code

Supported by
ST336752 and
ST318452 models

Supported by
ST336732 and
ST318432 models

Read Error Counter page (03h) Y Y

Read Reverse Error Counter page (04h) N N

Self-test Results page (10h) Y Y
Start-stop Cycle Counter page (0Eh) Y Y
Temperature page (0Dh) Y Y
Verify Error Counter page (05h) Y Y

Write error counter page (02h) Y Y
Mode Select (same pages as Mode Sense 1Ah) 15h Y [2] Y [2]
Mode Select (10) (same pages as Mode Sense 1Ah) 55h Y Y
Mode Sense 1Ah Y [2] Y [2]

Caching Parameters page (08h) Y Y

Control Mode page (0Ah) Y Y

Disconnect/Reconnect (02h) Y Y

Error Recovery page (01h) Y Y

Format page (03h) Y Y
Information Exceptions Control page (1Ch) Y Y

Notch and Partition Page (0Ch) N N

Port Control Page (19h) N Y

Power Condition page (1Ah) Y Y

Rigid Disc Drive Geometry page (04h) Y Y

Unit Attention page (00h) Y Y

Verify Error Recovery page (07h) Y Y
Xor Control page (10h) N N
Mode Sense (10) (same pages as Mode Sense

5Ah Y Y

1Ah)
Prefetch 34h N N
Read 08h Y Y
Read Buffer (modes 0, 2, 3, Ah and Bh supported) 3Ch Y Y
Read Capacity 25h Y Y
Read Defect Data (10) 37h Y Y
Read Defect Data (12) B7h Y Y
Read Extended 28h Y Y
DPO bit supported Y Y
FUA bit supported Y Y
Read Long 3Eh Y Y
Reassign Blocks 07h Y Y
Receive Diagnostic Results 1Ch Y Y

Supported Diagnostics pages (00h) Y Y

Translate page (40h) Y Y
Release 17h Y Y
Release (10) 57h Y Y
Request Sense 03h Y Y

Actual Retry Count bytes Y Y

Extended Sense Y Y

Field Pointer bytes Y Y
Reserve 16h Y Y

46 Cheetah X15 36LP Product Manual, Rev. D

Table 6: Commands supported by Cheetah X15 36LP family drive (Continued)

Supported by

Command name

Command
code

ST336752 and
ST318452 models

3rd Party Reserve Y Y

Extent Reservation N N
Reserve (10) 56h Y Y
3rd Party Reserve Y Y
Extent Reservation N N
Rezero Unit 01h Y Y
Search Data Equal 31h N N
Search Data High 30h N N
Search Data Low 32h N N
Seek 0Bh Y Y
Seek Extended 2Bh Y Y
Send Diagnostics 1Dh Y Y

Supported Diagnostics pages (00h) Y Y

Translate page (40h) Y Y
Set Limits 33h N N
Start Unit/Stop Unit (spindle ceases rotating) 1Bh Y Y
Synchronize Cache 35h Y Y
Test Unit Ready 00h Y Y
Verify 2 Fh Y Y
BYTCHK bit Y Y
Write 0Ah Y Y
Write and Verify 2Eh Y Y
DPO bit Y Y
Write Buffer (modes 0, 2, supported) 3Bh Y Y
Firmware Download option

YY

(modes 5, 7, Ah and Bh supported) [3]
Write Extended 2Ah Y Y
DPO bit Y Y
FUA bit Y Y
Write Long 3Fh Y Y
Write Same 41h Y Y
PBdata N N
LBdata N N
XDRead 52h N N
XDWrite 50h N N
XPWrite 51h N N

Supported by
ST336732 and
ST318432 models

[1] The drive can format to any even number of bytes per sector from 512 to 704.
[2] Tables 8 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 X15 36LP Product Manual, Rev. D 47

Table 7 lists the Standard Inquiry command data that the drive should return to the initiator per the format given

in the SCSI Interface Product Manual, part number 75789509, Inquiry command section.

Table 7: Cheetah X15 36LP 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] [36] [37] [35] [32] [4C] [57] [20]

32-47 R# R# R# R# S# S# S# S# S# S# S# S# 00 00 00 00

48-63 000000 0000000000 000000 0000000000

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 [32] COPYRIGHT

5

112-127 [30] [30] [31]

128-143 72 69 67 68 74 73 20 72 65 73 65 72 76 65 64 20

1

[]

03 means SCSI-3 (Ultra160) implemented.

20 53 65 61 67 61 74 65 20 41 6C 6C 20 NOTICE

3

20 20 20 20 20 PRODUCT ID

04 means SCSI-4 (Ultra320) implemented (ST336732 and ST318432 models only)

2

[]

The 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 addressing mode to assign LUNs to logical units (default is 12).

R# Four ASCII digits representing the last four digits of the product Firmware Release number. This informa-

tion is also given in the Vital Product Data page C0h, together with servo RAM and ROM release num­bers.

S# Eight ASCII digits representing the eight digits of the product serial number.

3

[]

Bytes 18 through 26 reflect model of drive. The table above shows the hex values for Model ST336752LW.
Refer to the values below for the values of bytes 18 through 26 of you particular model:
ST336752LW 33 33 36 37 35 32 4C 57
ST336752LC 33 33 36 37 35 32 4C 43
ST318452LW 33 31 38 34 35 32 4C 57
ST318452LC 33 31 38 34 35 32 4C 43
ST336732LW 33 33 36 37 33 32 4C 57
ST336732LC 33 33 36 37 33 32 4C 43
ST318432LW 33 31 38 34 33 32 4C 57
ST318432LC 33 31 38 34 33 32 4C 43

5

[]

Copyright Year - changes with actual year.

9.3.1 Inquiry Vital Product data

Instead of the standard Inquiry data shown in Table 7, the initiator can request several Vital Product Data

pages by setting the Inquiry command EVPD bit to one. The SCSI Interface Product 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.

48 Cheetah X15 36LP Product Manual, Rev. D

9.3.2 Mode Sense data

The Mode Sense command provides a means for the drive to report its operating parameters to the initiator.
The drive maintains four sets of Mode parameters, Default values, Saved values, Current values and 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 disk media using a Mode Select command. Only parameter values that are
allowed to be changed can be changed by this method. See “Changeable values” defined below. Parameters
in the saved values list that are not changeable by the Mode Select command get their values from the default
values storage.

Current values are volatile values currently being used by the drive to control its operation. A Mode Select
command can be used to change these values (only those that are changeable). Originally, they are installed
from saved or default values after a power on reset, hard reset, or Bus Device Reset message.

Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the current values and
saved values can be changed by a Mode Select command. A “one” allows a change to a corresponding bit; a
“zero” allows no change. For example, in Table 8 refer to Mode page 01, in the row entitled “CHG”. These are
hex numbers representing the changeable values for mode page 01. Note that bytes 04, 05, 06, and 07 are not
changeable, because those fields are all zeros. If some changeable code had a hex value EF, that equates to
the binary pattern 1110 1111. If there is a zero in any bit position in the field, it means that bit is not changeable.
Bits 7, 6, 5, 3, 2, 1, and 0 are changeable, because those bits are all ones. Bit 4 is not changeable.

Though the drive always reports non-zero values in bytes 00 and 01, those particular bytes are never 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 val­ues storage location on the media prior to shipping.

When a drive is powered up, it takes saved values from the media and stores them to the current values stor­age in volatile memory. It is not possible to change the current values (or the saved values) with a Mode Select
command before the drive is up to speed and is “ready.” An attempt to do so results in a “Check Condition sta-
tus being returned.

Note. Because there may be several different versions of drive control firmware in the total population of

drives in the field, the Mode Sense values given in the following tables may not exactly match those of
some drives.

Cheetah X15 36LP Product Manual, Rev. D 49

Tables 8 and 9 list the values of the data bytes returned by ST336752 and ST318452 model drives in response to

the Mode Sense command pages for SCSI Ultra160 implementation (see the SCSI Interface Manual).

Definitions:

DEF = Default value. Standard drives are shipped configured this way.
CHG= Changeable bits; indicates if current and saved values are changeable.

Note. Saved values for OEM drives are normally the same as the default values.

Table 8: ST336752 Mode sense data

Bytes 00010203040506070809101112 1314151617181920212223

Mode
Sense
Data

Mode
Page

01 DEF

01 CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff

02 DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00

02 CHG 82 0e ff ff 00 00 00 00 00 00 00 00 87 00 00 00

03 DEF 83 16 26 e8 00 00 00 33 00 00 01 e8 02 00 00 01 00 98 00 54 40 00 00 00

03 CHG

04 DEF 84 16 00 48 40 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a 94 00 00

04 CHG

07 DEF 87 0a 00 0b f0 00 00 00 00 00 ff ff

07 CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff

08 DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 14 00 00 00 00 00 00

08 CHG 88 12 b5 00 00 00 ff ff ff ff 00 00 a0[1] ff 00 00 00 00 00 00

0A DEF 8a 0a 02 00 00 00 00 00 00 00 03 84

0A CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00

00 a6 00 10 00 00 00 08 04 45 dc c9 00 00 02

<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->

81 0a c0 0b f0 00 00 00 05 00 ff ff

83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

1A DEF 9a 0a 00 03 00 00 00 01 00 00 00 04

1A CHG 9a 0a 00 03 00 00 00 00 00 00 00 00

1C DEF 9c 0a 10 00 00 00 00 00 00 00 00 01

1C CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff

00 DEF 80 06 00 00 0f 00 00 00

00 CHG 80 06 f7 40 0f 00 00 00

Read capacity data

04 45 dc c8 00 00 02 00

[1] Though byte 12, bit 7 (A0) is shown as changeable, the FSW function governed by that bit is not imple-

mented by this drive.

50 Cheetah X15 36LP Product Manual, Rev. D

Table 9: ST318452 Mode sense data

Bytes 00010203040506070809101112 1314151617181920212223

Mode
Sense
Data

Mode
Page

01 DEF

01 CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff

02 DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00

02 CHG 82 0e ff ff 00 00 00 00 00 00 00 00 87 00 00 00

03 DEF 83 16 13 74 00 00 00 19 00 00 01 e8 02 00 00 01 00 98 00 54 40 00 00 00

03 CHG

04 DEF 84 16 00 48 40 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a 94 00 00

04 CHG

07 DEF 87 0a 00 0b f0 00 00 00 00 00 ff ff

07 CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff

08 DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 14 00 00 00 00 00 00

08 CHG 88 12 b5 00 00 00 ff ff ff ff 00 00 a0[1] ff 00 00 00 00 00 00

0A DEF 8a 0a 02 00 00 00 00 00 00 00 01 f4

0A CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00

00 a6 00 10 00 00 00 08 02 22 ee 56 00 00 02 00

<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->

81 0a c0 0b f0 00 00 00 05 00 ff ff

83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

1A DEF 9a 0a 00 03 00 00 00 01 00 00 00 04

1A CHG 9a 0a 00 03 00 00 00 00 00 00 00 00

1C DEF 9c 0a 10 00 00 00 00 00 00 00 00 01

1C CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff

00 DEF 80 06 00 00 0f 00 00 00

00 CHG 80 06 f7 40 0f 00 00 00

Read capacity data

02 22 ee 55 00 00 02 00

[1] Though byte 12, bit 7 (A0) is shown as changeable, the FSW function governed by that bit is not imple-

mented by this drive.

Cheetah X15 36LP Product Manual, Rev. D 51

Tables 10 and 11 list the values of the data bytes returned by ST336732 and ST318432 model drives in response

to the Mode Sense command pages for SCSI Ultra320 implementation (see the SCSI Interface Manual).

Definitions:

DEF = Default value. Standard drives are shipped configured this way.
CHG= Changeable bits; indicates if current and saved values are changeable.

Note. Saved values for OEM drives are normally the same as the default values.

Table 10: ST336732 Mode sense data

Bytes 00010203040506070809101112 1314151617181920212223

Mode
Sense
Data

Mode
Page

01 DEF

01 CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff

02 DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00

02 CHG 82 0e ff ff 00 00 00 00 00 00 00 00 87 00 00 00

03 DEF 83 16 26 e8 00 00 00 33 00 00 01 e8 02 00 00 01 00 98 00 54 40 00 00 00

03 CHG

04 DEF 84 16 00 48 40 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a 94 00 00

04 CHG

07 DEF 87 0a 00 0b f0 00 00 00 00 00 ff ff

07 CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff

08 DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 00 1c 00 00 00 00 00 00

08 CHG 88 12 b5 00 00 00 ff ff ff ff 00 00 a0[1] ff 00 00 00 00 00 00

0A DEF 8a 0a 02 00 00 00 00 00 00 00 03 84

0A CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00

00 a6 00 10 00 00 10 08 04 45 dc c9 00 00 02

<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->

81 0a c0 0b f0 00 00 00 05 00 ff ff

83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

19 DEF 19 06 00 01 ff ff 00 00

19 CHG 19 06 00 00 ff ff 00 00

1A DEF 9a 0a 00 03 00 00 00 01 00 00 00 04

1A CHG 9a 0a 00 03 00 00 00 00 00 00 00 00

1C DEF 9c 0a 10 00 00 00 00 00 00 00 00 01

1C CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff

00 DEF 80 06 00 00 0f 00 00 00

00 CHG 80 06 f7 40 0f 00 00 00

Read capacity data

04 45 dc c8 00 00 02 00

[1] Though byte 12, bit 7 (A0) is shown as changeable, the FSW function governed by that bit is not imple-

mented by this drive.

52 Cheetah X15 36LP Product Manual, Rev. D

Table 11: ST318432 Mode sense data

Bytes 00010203040506070809101112 1314151617181920212223

Mode
Sense
Data

Mode
Page

01 DEF

01 CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff

02 DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00

02 CHG 82 0e ff ff 00 00 00 00 00 00 00 00 87 00 00 00

03 DEF 83 16 13 74 00 00 00 19 00 00 01 e8 02 00 00 01 00 98 00 54 40 00 00 00

03 CHG

04 DEF 84 16 00 48 40 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a 94 00 00

04 CHG

07 DEF 87 0a 00 0b f0 00 00 00 00 00 ff ff

07 CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff

08 DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 14 00 00 00 00 00 00

08 CHG 88 12 b5 00 00 00 ff ff ff ff 00 00 a0[1] ff 00 00 00 00 00 00

0A DEF 8a 0a 02 00 00 00 00 00 00 00 01 f4

0A CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00

00 a6 00 10 00 00 00 08 02 22 ee 56 00 00 02 00

<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->

81 0a c0 0b f0 00 00 00 05 00 ff ff

83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

19 DEF 19 06 00 01 ff ff 00 00

19 CHG 19 06 00 00 ff ff 00 00

1A DEF 9a 0a 00 03 00 00 00 01 00 00 00 04

1A CHG 9a 0a 00 03 00 00 00 00 00 00 00 00

1C DEF 9c 0a 10 00 00 00 00 00 00 00 00 01

1C CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff

00 DEF 80 06 00 00 0f 00 00 00

00 CHG 80 06 f7 40 0f 00 00 00

Read capacity data

02 22 ee 55 00 00 02 00

[1] Though byte 12, bit 7 (A0) is shown as changeable, the FSW function governed by that bit is not imple-

mented by this drive.

Cheetah X15 36LP Product Manual, Rev. D 53

9.4 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 can alter the SCSI bus phase sequence. Other miscellaneous operating

features supported are also listed here. Refer to the SCSI Interface Product Manual for details.

Table 12: 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

Y Good

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

54 Cheetah X15 36LP Product Manual, Rev. D

9.5 Synchronous data transfer

9.5.1 Synchronous data transfer periods supported

The data transfer period to be used by the drive and the initiator is established by an exchange of messages

during the Message Phase of operation. See the section on message protocol in the SCSI Interface Product
Manual, part number 75789509. In the following tables, M is the synchronous period value (in the transfer rate

negotiation message) that represents the associated transfer period and transfer rate values.

Table 13 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 13: Synchronous DT DATA transfer periods

M(decimal)

Transfer period
(nanoseconds)

86.25

Transfer rate
(megatransfers/second)

1

160.0

Transfer rate
(MBytes/sec) on wide bus

1

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

1. This transfer rate is only supported on drives which support the Ultra320 interface

(ST336732 and ST318432 models).

Table 14 lists the synchronous data transfer periods supported by the drive in ST DATA phase. ST DATA phase
is allowed with either LVD or SE interface except as noted.

Table 14: Synchronous ST DATA transfer periods

M(decimal)

Transfer period
(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.

9.5.2 REQ/ACK offset

Cheetah X15 36LP family drives support REQ/ACK offset values from 7 to 63 (3Fh). Offsets of 1 through 6 are
negotiated to 0 (asynchronous transfer).

9.6 Physical interface

This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O
interface. See Section 9.8 and Section 9.9 for additional terminator information.

Figures 18 and 19 show the locations of the DC power connector, SCSI interface connector, drive select head­ers, and option select headers.

Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI

operational aspects of Seagate drive interfaces are given in the SCSI Interface Product Manual.

Cheetah X15 36LP Product Manual, Rev. D 55

9.6.1 DC cable and connector

ST336752LW and ST318452LW drives receive DC power through a 4 pin connector (see Figure 20 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 18 and 19.

56 Cheetah X15 36LP Product Manual, Rev. D

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

J2

J6

Figure 18. LW model drive physical interface (68-pin J1 SCSI I/O connector)

80-pin

SCSI I/O

Connector

Pin 1

J2

J6

Figure 19. LC model drive physical interface (80-pin J1 SCSI I/O connector)

Cheetah X15 36LP Product Manual, Rev. D 57

9.6.2 SCSI interface physical description

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 SPI-4 standard. These drives imple­ment driver and receiver circuits that can operate either SE or LVD. However, they cannot switch dynamically
between SE and LVD operation.

• ST336752 and ST318452 models support the physical interface requirements of the SPI-4 standard 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 Ultra160
protocol extensions that they don’t support.

• ST336732 and ST318432 models support the physical interface requirements of the SPI-4 standard 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 typically operate on a daisy-chain interface in which other SCSI devices are also operating. Devices
on the daisy chain must all operate in the same mode, either SE or LVD, but not a mixture of these. On the
interface daisy chain, all signals are common between all devices on the chain, or bus, as it is also called. This
daisy chain of SCSI devices must be terminated at both ends with the proper impedance in order to operate
correctly. Do not terminate intermediate SCSI devices. In some cases, the SCSI devices at each end have

onboard termination circuits that can be enabled by installation of a jumper plug (TE) on the device. These ter-

mination circuits receive power from either a source internal to the device, or from a line in the interface cable
specifically powered for that purpose. LC and LW model drives do not have onboard termination circuits. Some
type of external termination circuits must be provided for these drives by the end user or designers of the
equipment into which the drives will be integrated. See the SPI-4 standard for the maximum number of devices
that can successfully operate at various interface transfer rates on SE and LVD daisy chains.

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 daisy chain 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.

Table 15 shows the interface transfer rates supported by the various drive models defined in this manual.

58 Cheetah X15 36LP Product Manual, Rev. D

Table 15: Interface transfer rates supported

Maximum transfer rate

Interface type/
drive models

SE

ST336752LW

Asynchronous Fast-5 Fast-10

yes yes yes yes no no no

Fast-20
(Ultra)

Fast-40
(Ultra2)

Fast-80
(Ultra160)

Fast-160
(Ultra320)

ST336752LC
ST318452LW

LV D

ST318452

ST336752LW

LC

yes yes yes yes yes yes no

ST336752LC
ST318452LW

SE

ST318452

ST336732LW

LC

yes yes yes yes no no no

ST336732LC
ST318432LW
ST318432LC

LV D

ST336732LW

yes yes yes yes yes yes yes

ST336732LC
ST318432LW
ST318432LC

9.6.3 SCSI interface cable requirements

The characteristics of cables used to connect parallel interface drives are discussed in the ANSI standards ref­erenced in this section.

9.6.3.1 Cable requirements

The characteristics of cables used to connect Ultra160 and Ultra320 SCSI parallel interface devices are dis­cussed in detail in section 6 of the SPI-4 standard. The cable characteristics that must be considered when
interconnecting the drives described in this manual in a SCSI parallel, daisy-chain interconnected system are:

• characteristic impedance (see SPI-4 sections 6.3.3, 6.3.4, and 6.3.5)

• propagation delay (see SPI-4 sections 6.3.6 and 6.3.7)

• cumulative length (see SPI-4 sections 6.6 and 6.8)

• stub length (see SPI-4 sections 6.6 and 6.9)

• device spacing (see SPI-4 sections 6.6 and 6.9)

To minimize discontinuances and signal reflections, cables of different impedances should not be used on 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, Fast-40,
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 or Fast-160 operation, twisted pair cables are required.

All LC model drives:

The 80-pin connector option 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 section 6 of the SPI-4 standard. For LC model drives, installations with connectors on cables are
not recommended.

Cheetah X15 36LP Product Manual, Rev. D 59

9.6.4 Mating connectors

Part numbers for the different type connectors that mate with the various Cheetah X15 36LP I/O connectors
are given in the sections following.

9.6.4.1 Mating connectors for LW model drives

The nonshielded cable connector shall be a 68 conductor connector consisting of two rows of 34 male contacts
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 20.

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 21).

9.6.4.2 Mating connectors for LC model drives

The nonshielded connector shall be an 80-conductor connector consisting of two rows of 40 contacts with
adjacent contacts 50 (1.27 mm) mils apart (see Figure 22). 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 disk drive interface connector(s) should be strictly designed according to proper power
transmission 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. Daisy-chain 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 mate properly, both drive connector
and host equipment mating connector must meet the provisions of “SFF-8451 Specification for SCA-2
Unshielded Connections.” See www.sffcommittee.org to obtain this specification.

60 Cheetah X15 36LP Product Manual, Rev. D

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 the SPI-4 standard (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 20. SCSI daisy chain interface cabling for LW drives

Cheetah X15 36LP Product Manual, Rev. D 61

3.650–.005

.100

(2.54)

.1 5 5

.050

.022

.346

1.650 .3937 .600

.519

1.816

(46.13)

Position 1

(13.18)

.315

(8.00)

.270

.0787 .200

.020 .047

.60

(15.24)

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)

.980

(24.89)

1.650

(41.91)

1.368

(37.74)

Pos. 35

3.650

(92.71)

.0787
(2.00)

Pos.

2

Figure 21. Nonshielded 68 pin SCSI device connector used on LW drives

.840 – .005

.767

(19.48)

(21.34)

+.001
—.002

dia

.083
(2.1)

Trifurcated Pins
(4 places)

62 Cheetah X15 36LP Product Manual, Rev. D

7.00

(.276)

Pin 1

0.15

62.15

(2.447)

0.15

Housing

MYM

—Y—

– 0.15
(– .005)

MYM

57.87

(2.278)

Grounding

0
—0.15
+ .000

[

— .006

Pins

[

C

of Datum Y

L

12.70
(.500)

2.15–0.10
2 places

X

End View

Front View

Insert mating
I/O connector

Top View

Contact

0.50

(.020)

0.3

(.012)

1.27
(.05)

Typ

MYM

Pin 1 Pin 40

Pin 41 Pin 80

C

L

X

of Datum Y

Figure 22. Nonshielded 80 pin SCSI “SCA-2” connector, used on LC drives

Grounding

Pins

Back View

Cheetah X15 36LP Product Manual, Rev. D 63

Table 16: 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 1235 –DB12
GND 2 3436 –DB13
GND 3 5637 –DB14
GND 4 7838 –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 192044 –DB4
GND 11 212245 –DB5
GND 12 232446 –DB6
GND 13 252647 –DB7
GND 14 272848 –DBP
GND 15 293049 GND
GND 16 313250 GND
TermPwr 17 333451 TermPwr
TermPwr 18 353652 TermPwr
Reserved 19 37 38 53 Reserved
GND 20 394054 GND
GND 21 414255 –AT N
GND 22 434456 GND
GND 23 454657 –BSY
GND 24 474858 –ACK
GND 25 495059 –RST
GND 26 515260 –MSG
GND 27 535461 –SEL
GND 28 555662 –C/D
GND 29 575863 –REQ
GND 30 596064 –I/O
GND 31 616265 –DB8
GND 32 636466 –DB9
GND 33 656667 –DB10
GND 34 676868 –DB11

Notes [ ]: See page following Table 19.

64 Cheetah X15 36LP Product Manual, Rev. D

Table 17: 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 1235 –DB12
+DB13 2 3436 –DB13
+DB14 3 5637 –DB14
+DB15 4 7838 –DB15
+DBP1 5 9 10 39 –DBP1
+DB0 6 111240 –DB0
+DB1 7 131441 –DB1
+DB2 8 151642 –DB2
+DB3 9 171843 –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 313250 Ground
TermPwr 17 333451 TermPwr
TermPwr 18 353652 TermPwr
Reserved 19 37 38 53 Reserved
Ground 20 39 40 54 Ground
+ATN 21 41 42 55 –AT N
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 656667 –DB10
+DB11 34 676868 –DB11

Notes [ ]: See page following Table 19.

Cheetah X15 36LP Product Manual, Rev. D 65

Table 18: 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 1050GND
–I/O 11 51 GND
–REQ 1252GND
–C/D 1353GND
–SEL 1454GND
–MSG 1555GND
–RST 1656GND
–ACK 1757GND
–BSY 1858GND
–ATN 1959GND
–DBP 2060GND
–DB7 2161GND
–DB6 2262GND
–DB5 2363GND
–DB4 2464GND
–DB3 2565GND
–DB2 2666GND
–DB1 2767GND
–DB0 2868GND
–DP1 2969GND
–DB15 30 70 GND
–DB14 31 71 GND
–DB13 32 72 GND
–DB12 33 73 GND

+5 V 3474MATED 2
+5 V 35755 V GND
+5 V 36765 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 19.

66 Cheetah X15 36LP Product Manual, Rev. D

Table 19: 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.

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 +DB11
–DB10 8 48 +DB10
–DB9 9 49 +DB9
–DB8 1050+DB8
–I/O 11 51 +I/O
–REQ 1252+REQ
–C/D 1353+C/D
–SEL 1454+SEL
–MSG 1555+MSG
–RST 1656+RST
–ACK 1757+ACK
–BSY 1858+BSY
–ATN 1959+ATN
–DBP 2060+DBP0
–DB7 2161+DB7
–DB6 2262+DB6
–DB5 2363+DB5
–DB4 2464+DB4
–DB3 2565+DB3
–DB2 2666+DB2
–DB1 2767+DB1
–DB0 2868+DB0
–DBP1 29 69 +DP1
–DB15 30 70 +DB15
–DB14 31 71 +DB14
–DB13 32 72 +DB13
–DB12 33 73 +DB12

+5 V 3474MATED 2
+5 V 35755 V GND
+5 V CHARGE36765 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 X15 36LP Product Manual, Rev. D 67

Notes [ ] for Tables 16 through 19.

[1] See Section 9.6.4.1 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 starts at power on or after a delay of 12

seconds 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 single ended device on the bus.

Drive will not operate I/O bus at Ultra2 or faster SCSI data rates if this is grounded.
[9] Signals [4] through [7] are used in place of installing jumpers and cables on option select connectors J2

and J6. See Section 8.1.1 notes.
[10] “NC” means no connection.
[11] 8 bit devices which are connected to the 16 data bit LVD I/O shall leave the following signals open: –DB8,

–DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.

8 bit devices which are connected to the 16 data bit single-ended (SE) I/O shall have the following signals

open: DB8, –DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.

All other signals should be connected as shown.
[12] 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.

9.7 Electrical description

Cheetah X15 36LP drives are multimode devices. That is, their I/O circuits can operate as either single-ended
or low voltage differential drivers/receivers (selectable using the I/O “DIFFSENS” line).

See the SPI-4 standard for detailed electrical specifications.

9.7.1 Multimode—SE and LVD alternatives

When the interface “DIFFSNS” line is between -0.35 V and +0.5 V, the drive interface circuits operate 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 differential levels and should never be exposed to high voltage differential
environments unless the common mode voltages in the environment are controlled to safe levels for single­ended and low voltage differential devices (see the SPI-4 standard).

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 = 0.260 V = < V
Steady state High level output differential voltage = 0.270 V = < V

= < 0.640 V (signal negation/logic 0)

s

= < 0.780 V (signal assertion/logic 1)

s

L V D Input characteristics

Each differential signal received by LVD interface receiver circuits shall have the following input characteristics
when measured at the disk drive connector:

68 Cheetah X15 36LP Product Manual, Rev. D

Steady state Low level input differential voltage = 0.030 V = < VIN = < 3.6 V (signal negation/logic 0)
Steady state High level input differential voltage* = –3.6 V = < V
Differential voltage = +

0.030 V minimum with common-mode voltage range 0.700 V = < Vcm = < 1.800 V.

= < –0.030 V (signal assertion/logic 1)

s

(X3T10/1142D revision 20b Section A.3.1)

VCCA VCCB

Single
Ended
Circuitry

Single
Ended
Ground
Driver

Ground

Single Ended:
LVD:

GND

+Signal

LVD Signal Drivers

LVD

Receiver

LVD Signal Drivers

Single
Ended
Receiver

—Signal
—Signal

Single
Ended
Negation
Driver

Single
Ended
Assertion
Driver

Figure 23. Typical SE-LVD alternative transmitter receiver circuits

9.7.1.1 General cable characteristics

To Minimize discontinuities and signal reflections, cables of different impedances should not be used in the
same bus. Implementations may require tradeoffs 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.

9.7.1.2 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 20 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 20: Cable characteristics for single-ended circuits

Maximum length

Maximum number of

I/O transfer rate

<

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

<

devices on the bus

betwen SCSI S.E.
terminators

Transmission line impedance

REQ/ACK Other signals

A stub length of no more than 0.1 meter (0.33 ft) is allowed off the mainline interconnection with any connected
equipment. The stub length is measured from the transceiver to the connection to the mainline SCSI bus.

Single-ended I/O cable pin assignments for LW drives are shown in Table 17.

Single-ended I/O pin assignments for LC models are shown in Table 18. The LC model does not require an I/O
cable. It is designed to connect directly to a back panel connector.

9.7.1.3 Low voltage differential I/O circuits

The maximum SCSI bus length between the terminators for a SCSI LVD point-to-point system (one initiator
and one target) is 25 meters.

Cheetah X15 36LP Product Manual, Rev. D 69

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 feet). However, implementation of this 12-meter total length is dependent on the
configuration of the system and the choice of cable. See Tables 21 and 22 for examples of recommended SCSI
LVD cable types and lengths.

Note from these tables that shielded round twister-pair cables can be used to implement a 12-meter system,
while Twist-n-flat cables cannot be used to implement a 12-meter system due to higher leels of attenuation and
crosstalk. In addition, twist-n-flat cables with shorter sections of twist allow greater crosstalk and their lengths
must be reduced as shown in Table 22.

Table 21: Example shielded round twister pair cables into a multi-drive backplane

Cable

Description

30 AWG
solid

28 AWG
standed

28 AWG
stranded

Table 22: Example Twist-n-flat cables into a multi-drive backplane

Cable

Description

TPE, 22.25” twist,

1.75” flat, (24” flat
to flat), 30 AWG
solid tinned coper)

TPE, 8.1” twist,

1.75” flat, (9.85” flat
to flat), 30 AWG
solid tinned coper)

TPE, 4.25” twist,

1.75” flat, (6” flat to
flat), 30 AWG solid
tinned coper)

Defferential
Impedance,

nominal

130 ohms 90 ohms 17 pF/ft 1.36 ns/ft 0.113 ohms/ft 12 meters minus the SCSI

123 ohms 80 ohms 19 pF/ft 1.54 ns/ft 0.067 ohms/ft 12 meters minus the SCSI

132 ohms 85 ohms 20 pF/ft 1.50 ns/ft 0.065 ohms/ft 12 meters minus the SCSI

Differential

impedance,

nominal

131 ohms 93 ohms 15.3 pF/ft 1.45 ns/ft 0.105 ohms/ft 3.05 meters

131 ohms 93 ohms 15.3 pF/ft 1.45 ns/ft 0.105 ohms/ft 2.45 meters

131 ohms 93 ohms 15.3 pF/ft 1.45 ns/ft 0.105 ohms/ft 1.52 meters

Single-ended

impedance,

nominal

Single-

ended

impedance,

nominal

Single-ended

capacitance,

maximum

Single-

ended

capacitance,

maximum

TimeDelay,

nominal

Time

Delay,

nominal

ConductorDC

resistance,

nominal

ConductorDC

resistance,

nominal

Maximum shielded

round twister-pair cable

length for

Ultra160/Ultra320

trace length of the back­plane

trace length of the back­plane

trace length of the back­plane

Twist-n-flat

Cable Length

Ultra320

transfer

rate

(10.0 ft)

(8.33 ft)

(5.0 ft)

Ultra160

transfer

rate

6.1 meters
(20.0 ft)

4.9 meters
(16.66 ft)

3.04 meters
(10.0 ft)

70 Cheetah X15 36LP Product Manual, Rev. D

9.8 Terminator requirements Caution: These drives do not have onboard internal terminators. The user, systems integrator or host equip-

ment manufacturer must provide a terminator arrangement external to the drive when termination is
required. For LW drives, terminator modules can be purchased that plug between the SCSI I/O
cable and the drive I/O connector or on the end of a short I/O cable stub extending past the last
cable connector. LC drives are designed to be plugged into a backpanel connector without cabling.

9.9 Terminator power LW drives

You can configure terminator power from the drive to the SCSI bus or have the host adaptor or other device
supply terminator power to the external terminator. See Section 8.1 for illustrations that show how to place
jumpers for this configuration.

LC drives

These drives cannot furnish terminator power because no conductors in the 80-pin I/O connector are devoted
to terminator power.

Cheetah X15 36LP Product Manual, Rev. D 71

9.10 Disc drive SCSI timing

Table23: DiscdriveSCSItiming

These values are not current Cheetah X15 36LP values, but are listed for information only.

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 Dependent

Command to Data (para. In) T06 4.5-9 Command Dependent

Command to Data (para. Out) T07 4.5-10 Command Dependent

Command to Data (Write to Data Buffer) T08 4.5-10 Command Dependent

Command to Disconnect MSG T09 4.5-6 Command Dependent

Disconnect MSG to Bus Free T10 4.5-6,14 0.52 µs

Disconnect to Arbitration (for Reselect)

T11 4.5-6 Command Dependent

This measures disconnected CMD overhead

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 Dependent

Reselect Identify MSG to Data (media) T16 4.5-11 Command Dependent

Data to Status T17 4.5-15 Command Dependent

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

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

72 Cheetah X15 36LP Product Manual, Rev. D

Table 23: Disc drive SCSI timing (Continued)

These values are not current Cheetah X15 36LP values, but are listed for information only.

Description

Waveform
symbol [1]

Waveform
table [1] Typical timing

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 SCSI Interface Product Manual.

[2] Maximum SCSI asynchronous interface transfer rate is given in Section 4.2.3 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 9.5. See also the Synchronous data transfer section and the

Extended messages section of the SCSI Interface Product Manual for a description of synchronous data

transfer operation.

9.11 Drive activity LED

The following table provides drive activity LED status.

Table24: DriveactivityLEDstatus

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 N/A Off due to absense of 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 Test 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 Immedidate LED toggles on/off on each cylinder boundary

Cheetah X15 36LP Product Manual, Rev. D 73

10.0 Seagate Technology support services Online Services

Internet

www.seagate.com for information about Seagate products and services. Worldwide support is available 24

hours daily by e-mail for your disc or tape questions.

Presales Support:

Disc: www.seagate.com/support/email/email_presales.html or [e-mail].
Tape: www.seagate.com/support/email/email_tape_presales.html or [e-mail].

Technical Support:

Disc: www.seagate.com/support/email/email_disc_support.html or [e-mail].
Tape: www.seagate.com/support/email/email_tape_support.html or [e-mail].

Reseller Marketplace

Reseller Marketplace is the storage industry’s first collaborative, e-commerce marketplace offering resellers
the fastest, most efficient online purchasing process for Seagate storage solutions. The Reseller Marketplace
at marketplace.seagate.com, an exclusive service for US resellers participating in the Seagate Partner Pro­gram (SPP), is designed to streamline the purchasing process of Seagate solutions and provide unprece­dented value to Seagate’s resellers through real-time pricing and availability, fast and easy comparison
shopping, and seamless integration with key distributors for a one-stop shopping experience.

For support, questions and comments: reseller.seagate.com/benefits/T1.html or 1-877-271-3285 (toll-free)
9

A.M. to 7 P.M. (eastern time) Monday through Friday.

Tape Purchases

US customers can purchase Seagate data cartridges, tape supplies, accessories, and select Seagate tape
drive products 24 hours daily at buytape.seagate.com.

Automated Services

SeaFONE®(1-800-SEAGATE) is Seagate’s toll-free number (1-800-732-4283) to access our automated self-

help services. Using a touch-tone phone, you can find answers to service phone numbers, commonly asked
questions, troubleshooting tips and specifications for disc drives and tape drives 24 hours daily. International
callers can reach this service by dialing [phone].

SeaFAX

obtain technical support information by return FAX 24 hours daily.

®

(1-800-SEAGATE) is Seagate’s automated FAX delivery system. Using a touch-tone phone, you can

Presales Support

Presales Support

Our Presales Support staff can help you determine which Seagate products are best suited for your specific
application or computer system.

Technical Support

If you need help installing your drive, consult your dealer. Dealers are familiar with their unique system configu­rations and can help you with system conflicts and other technical issues. If you need additional help, you can
talk to a Seagate technical support specialist. Before calling, note your system configuration and drive model
number (ST####).

SeaTDD™ ([phone]) is a telecommunications device for the deaf (TDD). You can send questions or

comments 24 hours daily and exchange messages with a technical support specialist from 8:00
11:45

A.M. and 1:00 P.M. to 6:00 P.M. (central time) Monday through Friday.

A.M. to

74 Cheetah X15 36LP Product Manual, Rev. D

Customer Service (CSO)

Warranty Service

Seagate offers worldwide customer support for Seagate drives. Seagate direct OEM, Distribution and System
Integrator customers should contact their Seagate service center representative for warranty information.
Other customers should contact their place of purchase.

Authorized Service Centers

If you live outside the US, you can contact an Authorized Service Center for service.

USA/Canada/Latin America Support Services

Presales Support

Call Center Toll-free Direct dial FAX

Disc: 1-877-271-3285 [phone] [phone]
Tape: 1-800-626-6637 [phone] [phone]

Technical Support (SeaFONE)

1-800-SEAGATE or [phone] (for specific product phone number)

FAX: Disc: [phone]; Tape and Server Appliance: [phone]

SeaFAX 1-800-SEAGATE
SeaTDD [phone]

Warranty Service

Call Center T oll-free Direct dial FAX / Internet

USA, Mexico and 1-800-468-3472 [phone] [phone]

Latin America

Canada

Memofix* 1-800-636-6349 [phone] [phone]

www.memofix.com

Adtech* 1-800-624-9857 [phone] [phone]

www.adtech1.com

Brazil

MA Centro de Serviços* — [phone] [phone]

e-mail: [e-mail]

European Support Services

For European customer support, dial the toll-free number for your specific country for presales support, techni­cal support, SeaFAX and warranty service.

If your country is not listed here, dial our European call center at [phone] from 8:30
(European central time) Monday through Friday. The European call center is located in Amsterdam, The Neth­erlands.

Call Center

Austria 0 800-20 12 90
Belgium 0 800-74 876
Denmark 80 88 12 66
France 0 800-90 90 52
Germany 0 800-182 6831
Ireland 1 800-55 21 22
Italy 800-790695
Netherlands 0 800-732 4283
Norway 800-113 91
Poland 00 800-311 12 38

A.M. to 5:00 P.M.

*Authorized Service Centers

Cheetah X15 36LP Product Manual, Rev. D 75

Spain 900-98 31 24
Sweden 0 207 90 073
Switzerland 0 800-83 84 11
Turkey 00 800-31 92 91 40
United Kingdom 0 800-783 5177

FAX Services—All European Countries

Presales/Technical Support/Warranty Service 31-20-653-3513

Africa/Middle East Support Services

For presales, technical support, warranty service and FAX services in Africa and the Middle East, dial our
European call center at [phone] from 8:30
Friday, or send a FAX to [phone]. The European call center is located in Amsterdam, The Nether­lands.

A.M. to 5:00 P.M. (European central time) Monday through

Asia/Pacific Support Services

For Asia/Pacific presales and technical support, dial the toll-free number for your specific country. The Asia/
Pacific toll-free numbers are available from 6:00
ern time) Monday through Friday. If your country is not listed here, direct dial one of our technical support loca­tions.

A.M. to 10:45 A.M. and 12:00 P.M. to 6:00 P.M. (Australian east-

Call Center Toll-free Direct dial FAX

Australia 1800-14-7201 ——
China ——[phone]
Hong Kong 800-90-0474 — [phone]
Indonesia 001-803-1-003-2165 ——
Japan ——[phone]
Malaysia 1-800-80-2335 ——
New Zealand 0800-443988 ——
Singapore 800-1101-150 — [phone]
Ta iw a n — [phone] [phone]
Thailand 001-800-11-0032165 ——

Warranty Service

Call Center Toll-free Direct dial FAX

Asia/Pacific — [phone] [phone]
Australia 1800-12-9277 ——
Japan — [phone] [phone]

76 Cheetah X15 36LP Product Manual, Rev. D

Cheetah X15 36LP Product Manual, Rev. D 77

Index

Symbols

+5 and +12 volt supplies 21

Numerics

68 conductor connector 59
68-pin connector
80 conductor connector
80 conductor interface
80 pin connector option
80 pin I/O connector

A

AC power 21
access time
accessories
acoustics
activity indicator
activity LED
actuator
actuator assembly
address
air cleanliness
air flow

air inlet
altitude
altitude and atmospheric pressure
ambient
ambient temperature
ANSI SCSI documents
arbitration priority
asynchronous interface transfer rate
audible noise
Australia/New Zealand Standard
automatic retry
automatic shipping lock
average idle current
average latency
average rotational latency

30

6, 40

9

27, 40

suggested

40
27

27

60

59

59

58

65, 66

8
7

67

72

6

30

40

27

27, 40

4

60

3

4

13

5

21

6

8, 9

72

C

cabinet cooling 40
cable

55

cache

9, 10, 11

cache buffer
cache miss
cache mode
cache operation
cache operation hit
cache segment
caching write data
Canadian Department of Communications
capacities
capacity, drive, programmable
case temperature
CE Marking
changeable bit
changeable value
check condition
circuits
class B limit
command
command descriptor block (CDB)
command queuing
condensation
conducted noise immunity
connect/disconnect
connector
connector contact
consecutive read operation
contiguous blocks of data
continuous vibration
controller
controller overhead
controller self test
cooling
C-Tick Marking
current
current limiting
current profile
current requirements
current value
cylinder boundary

6

10

9

9

11

10

10

7

7

27

3

49, 51

48

48

68

3

9, 44

9

6

27

21, 22

9

55

67

11

11

30

9

8

22

40

3

22

22

22, 23, 24

21

48, 49, 51

11

3

B

background processing 6
backward compatibility
bits/inch
buffer
buffer segment
buffer-full
buffer-full ratio
bulkhead connector
bus device reset message
bytes per sector
bytes/surface
bytes/track

8

9, 10, 11

10, 11

10

10

8

8

5

57

46

48

D

daisy-chain 22, 57, 60

80 conductor
data correction
data transfer period
data transfer protocol
data transfer rate
DC cable and connector
DC current
DC power
DC power carrying conductor
DC power connector

9, 13, 55

59

13

54

6

8

55

57

54

59

78 Cheetah X15 36LP Product Manual, Rev. D

DC power requirements 21
DC power source
dedicated landing zone
default
default mode parameter
default value
defect/error management
delayed motor start option
depot repair
depot repair philosophy
diagnostics
differential I/O circuit
differentiating features
dimensions
disable read ahead
disc access
disc media
disc rotational speed
disconnect/reconnect

discontinuity (DISC) bit
DRA bit
drive
drive activity
drive activity LED
drive capacity

drive default mode parameter
drive failure
drive firmware
drive ID
drive ID select jumper connector
drive ID/option select header
drive interface connector
drive internal
drive internal defects and errors
drive malfunction
drive mounting

drive orientation
drive power
drive primary defects list
drive SCSI timing
drive select header
drive transfer
drive volume
drive warranty
dynamic spindle brake

38, 39

control
specification

11

30

programmable

35

constraints

59

5

35

48, 49, 51

33

21, 67

14

14

22

39

5

31

11

10

8

8

10

10

10

11

67

72

8

7

35

14

48

35

35

59

22

33

14

31, 41

13

40

35

33

71

54

10

35

14

6

E

ECC 13
ECC correction capability
electrical characteristics
electromagnetic compatibility
electromagnetic interference (EMI)
electromagnetic susceptibility

6

54, 67

3

30

13

embedded servo
EMC compliance
EMI requirements
environment
environmental control
environmental interference
environmental limits
environmental requirements
EPROM
equipment malfunction
error
error management system
error rate
error rate calculation
error recovery
ETF defect list
European Union requirements
EVPD bit
execution time
extended messages

48

13

13

47

6

3

3

40

30

13

27

13

13

34

13

33

33

3

9

44

F

fault status 13
FCC rules and regulations
field repair
firmware
flat ribbon cable
flaw reallocation
format
format command
format time
formatted
formatting
front panel
front panel LED
FSW function

14

48

67

9

46

8

9

7

35

31

67

49, 50, 51, 52

3

G

GMR heads 5
gradient
ground return
grounding

27

21

41

H

hard reset 48
hardware error
HDA

5, 14, 40, 41

head and disc assembly. See HDA

heat removal
heat source
high level format
host

11, 33, 46, 57, 60

host adapter

adapter/initiator
host backplane wiring
host equipment

14

40

40

35

35

60

57

41, 58, 59

Cheetah X15 36LP Product Manual, Rev. D 79

DC power 59
host I/O signal
host system
host system malfunction
host/drive operational interface
hot plug
humidity

35

35

13

13

6, 15

27

I

I/O connector 57
identified defect
idle condition
Input characteristics
inquiry command
inquiry vital product data
installation
installation guide
installation instructions
instantaneous current peak
interface cable length
interface data
interface requirements
interface timing
internal data rate

33

25, 26

67

47

47

35

7

35

21

60

8

43

13

8

J

J1-auxiliary 35
jumper
jumper function description
jumper header
jumper plug type

7, 35, 38, 39, 67

39

38

35

L

landing zone 6
LB

10

LED

72

logical

9

logical block
logical characteristics
logical segment (mode select page 08h)
low level format
low voltage differential (LVD) drivers and receivers
LVD

67

LVD interface receiver circuits

9, 10, 11

54

9

35

67

M

magnetoresistive heads 5
mating connector
mating flat cable connector
maximum current requirements
maximum operating current
maximum starting current

mean time between failure. See MTBF

media

6, 48

media defect
media defect induced error

55, 59

59

22

21

21

13

13

6

medium error
message protocol
message protocol system
messages

SCSI interface
miscellaneous features
mode page 01
mode page 08h
mode parameter

page 08h
mode select command
mode select page 08h
mode sense command
mode sense command page 08h
mode sense data
mode sense value
model number table
motor start command
motor start delay option
motor start option
mounting configuration
mounting configuration dimensions
mounting constraints
mounting point
mounting surface
mounting surface distortion
mounting surface stiffness
MTBF

13, 14, 27

multimode drivers and receivers
multiple segment
multi-segmented cache control

14

54

34

43

53

48

9

48

11

9, 48

11

48, 49, 51

10

48

48

5

9

67

9, 21, 67

31

13, 41

41

41

41

41

6

10

9

N

noise 22

audible
non-operating

temperature
non-operating vibration
nonshielded 68 conductor connector

3

27, 28, 30

27

30

O

office environment 30
operating
operating environment
operating option
operating parameter
operator intervention
option jumper
option jumper location
option select header
option select jumper
options
orientation
out-of-plane deflection
out-of-plane distortion
Output characteristics

27, 28, 30

14

35

48

13

35

35

54

35

7

9, 28, 40

41
41
67

31, 32

59

80 Cheetah X15 36LP Product Manual, Rev. D

P

package size 28
package test specification
packaged
partition or logical drive
PCB
PCBA
PCBA circuit run
peak bits/inch
peak starting current
performance characteristics
performance degradation
peripheral I/O cable
physical buffer space
physical characteristics
physical damage
physical interface
physically contiguous blocks of data
power
power connector
power control switch
power dissipation
power distribution
power sequencing
power supply voltage
power-carrying conductor
power-on
power-on operating hours
power-on reset
power-up
power-up hours
prefetch
prefetch (read look-ahead)
prefetch ceiling field
prefetch data
prefetch field
prefetch hit
prefetch mode
prefetch of contiguous blocks
prefetch operation
prefetch segmented cache control
preventive maintenance
PRML read channel electronics
product data page
programmable drive capacity

28

14, 38

35, 41, 48, 55, 57, 60

57

8

30

54, 56

21, 22, 39

21, 22

25, 26

3

22

35, 67

48

22

14

9, 10, 11

11
11

11

9

9, 11

47

4

35

21

8

28

22

9

54

11

9

13

59

14

9, 11

11

11

9

13, 14

5

7

Q

QAS 43
Quick Arbitration and Selection (QAS)

R

radio interference regulations 3
read

10

read command
read data
read error

10, 11

10

13

43

read error rate
read operation
read retry count
read/write head
ready

48

receive diagnostic results
receiver circuits
recommended mounting
recoverable seek error
reference documents
regulation
relative humidity
reliability
reliability and service
reliability specifications
remote switch
repair facility
repair information
REQ/ACK offset
request sense command
request sense information
resonance
retrieved data

13, 33
10

33

8

34

68

29

13

4

21

27

6

14

13

35

14

19

54

34

14

28

10

S

S.M.A.R.T. 7, 15
safe power transmission
safety

3

saved value
SCSI

commands
format commands
interface data transfer rate

messages
SCSI bus cable
SCSI bus condition
SCSI bus ID
SCSI bus phase sequence
SCSI command
SCSI I/O connector
SCSI ID
SCSI interface
SCSI interface cable
SCSI interface commands supported
SCSI interface connector
SCSI interface data
SCSI Interface Product Manual
SCSI systems error
SCSI systems error consideration
SCSI systems error management
Seagate support service
sector
sector interleave
sector size
sector sizes
seek error
seek positioning error

48, 49, 51

44

43

35

67

33

35

9, 13, 57

10

8

7

9

13

59

13

8

53

53

56

58

54

8

3, 4, 5

34

33

34

35

13

44

Cheetah X15 36LP Product Manual, Rev. D 81

segment 9, 10
self-contained
Self-Monitoring Analysis and Reporting Technology.

SE-LVD alternative
sense key
sequential read operations
service

life

13, 14

philosophy

tools
servo data
shielding
shipping
shipping container

28

shock

and vibration
shock mount
signal ground
single unit shipping pack
single-ended (SE) drivers and receivers
single-ended interface circuit
site installation
software interleave
spare part
spindle
standard day
standards
start motor command
start/stop time
status
stop spindle
stop time
storage capacity
straight-in connector
strict bit in Mode page 00h
supply voltage
support services
synchronous data transfer
synchronous data transfer operation
synchronous data transfer period
synchronous transfer period
system chassis
system recovery procedures

22

34

10

See S.M.A.R.T.

68

14

11

14

14

6

3

19

27

28

41

41

7

6

25, 26

14

11

14

27

3

21

9

9

9

33

60

10

21

73

54

72

54

72

41

13

terminator power
terminator requirements
thermal monitor
TP1 position
tracks/inch
tracks/surface, total
transfer period
transmitter receiver circuits
typical access time

70

35, 70

16

39

8

8

54

68

9

U

Ultra160 49, 51
Ultra160 mode
Ultra160 SCSI interface
Ultra320 mode
unformatted
unrecoverable condition
unrecoverable error
unrecoverable seek error
Unrecoverable write error

44

5

44

7

13

13

14

13

V

vibration 28, 30
vital product data
volatile memory
voltage

9, 21

47

48

W

warranty 7, 19
wet bulb temperature
wide Ultra160 SCSI interface
wrap-around
write caching
write error

unrecoverable
write operation
write protect
write retry count

10

10

13

39

27

13

10

33

Z

zoned bit recording (ZBR) 6

5

T

technical support services 73
temperature

ambient
case
gradient
non-operating
regulation

See also cooling

temperature sensor
termination
terminator enable jumper TE

9, 16, 27, 40
27

27

27

27

3

17

22

60

Seagate Technology LLC
920 Disc Drive, Scotts Valley, California 95066-4544, USA

Publication Number: 100139872, Rev. D, Printed in USA