seagate ST39103FC, ST318203FC Product Manual

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Cheetah 18LP FC Disc Drive

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ST318203FC

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ST39103FC

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Product Manual, Volume 1

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Cheetah 18LP FC Disc Drive

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ST318203FC

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ST39103FC

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Product Manual, Volume 1

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© 1998, 1999 Seagate Technology, Inc. All rights reserved
August 1999

Publication number: 83329420, Rev. D

Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Tech­nology, Inc. Cheetah, SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either trademarks or
registered trademarks of Seagate Technology, Inc. or one of its subsidiaries. All other trademarks
or registered trademarks are the property of their respective owners.

No part of this publication may be reproduced in any form without written permission from

Seagate Technology, Inc.

Printed in the United States of America

Revision status summary sheet

Revision Date Writer/Engineer Sheets Affected

A 03/29/99 L. Newman/P. Kassel Class A Release
B 05/20/99 L. Newman/D. Rusch ECR: DJD51090.
C 06/16/99 L. Newman/D. Rusch ECR: DJD51095.
D 07/30/99 L. Newman/D. Rusch ECR: DJD51099.

Cheetah 1 8LP FC P r od uc t Manual, Rev. D v

Contents

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

2.0 Applicable standards and reference documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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

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

2.1.2 Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.0 General descr iption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

3.2 Media description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Factory-installed options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.9 User-installed accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.1 Internal drive characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2 Seek performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2.1 Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2.2 Format command execution time for ≥ 512-byte sectors . . . . . . . . . . . . . . . . . . . . . 9

4.2.3 General performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.3 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.4 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.5 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1

4.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.5.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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

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

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

5.1.2 Write errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.3 Seek errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2 Reliability and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4

5.2.1 Mean time between failure (MTB F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.2 Field failure rate vs time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.3 Preve ntive maintenan ce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.4 Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.5 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.6 Service tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.7 Hot plugging the drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.8 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.9 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.1 AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.2 DC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.2.1 Conduct ed noise immu nity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.2.2 Power sequenc ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.2.3 Current profiles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.3 Power dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.4 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4

6.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

vi Cheetah 18LP FC Product Manual, Rev. D

6.4.3 Effective altitude (sea level). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

6.4.4 Shock and vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

6.4.6 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

6.4.7 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

7.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

7.1 Drive internal defects/errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

7.2 Drive error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

7.3 FC-AL system errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

8.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

8.1 Drive ID/option selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

8.2 LED connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

8.2.1 J6 connector requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

8.3 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

8.4 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

8.4.1 Air flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

8.5 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

8.6 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

9.0 Interface requiremen ts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

9.1 FC-AL features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

9.1.1 Fibre Channel link service frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

9.1.2 Fibre Channel task managem ent functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

9.1.3 Fibre Channel task managem ent respons es . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

9.1.4 Fibre Channel port login. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

9.1.5 Fibre Channel port login accept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

9.1.6 Fibre Channel Proc ess Login. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

9.1.7 Fibre Channel Proc ess Login Accept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

9.1.8 Fibre Channel fabric login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

9.1.9 Fibre Channel fabric accept login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

9.1.10 Fibre Channel Arbitrated Loop options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

9.2 Dual port support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

9.3 SCSI commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

9.3.1 Inquiry data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

9.3.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

9.4 Miscellaneous operating features and con ditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

9.5 FC-AL physical interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

9.5.1 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

9.5.2 Connector requirem ent s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.5.3 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

9.5.4 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

9.5.5 FC-AL transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.5.6 Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.5.7 Fault LED Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.5.8 Active LED Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.5.9 Enable port bypass signal s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

9.5.10 Motor start controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

9.5.11 SEL_6 through SEL_0 ID lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

9.6 Signal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

9.6.1 TTL input characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

9.6.2 LED driver signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

9.6.3 Differential PECL output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

9.6.4 Differential PECL input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

10.0 Seagate Technology support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

Cheetah 1 8LP FC P r od uc t Manual, Rev. D vii

List of Figures

Figure 1. Cheetah 18LP FC family disc drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Cheetah 18LP FC disc drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3. Typical ST318203FC drive +12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 4. Typical ST39103FC drive +12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 5. Typical ST318203FC drive +5V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 6. Typical ST39103FC drive +5V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 7. DC current and power vs. input/output operations per second . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 8. DC current and power vs. input/output operations per second . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 9. Locations of PCBA components listed in Table 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 10. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 7

Figure 11. Mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 12. Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 13. LED indicator connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 14. Air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 15. Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 16. Port bypass circuit physical interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 17. FC-AL SCA device connector dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Figure 18. J6 connector dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Figure 19. FC-AL transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4

Figure 20. Transmit eye diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Figure 21. Receive eye diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Cheetah 1 8LP FC P r od uc t Manual, Rev. D 1

1.0 Scope

This manual describes Seagate Technology®, Inc. Cheetah 18LP FC (Fibre Channel) disc drives.
Cheetah 18LP FC dr ives support the Fibre Chann el Ar bitrated Lo op and SCSI Fi bre Chann el Pr otoco l specifi-

cations to the extent described in this manual. The Fibre Channel Interface Manual (part number 77767496)
describes the general Fibre Channel Arbitrated Loop characteristics of this and other Seag ate Fibre Channel
drive s.

Figure 1.

Cheetah 18LP FC

family disc drive

Cheetah 1 8LP FC P r od uc t 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 hos t equipment to provide adequat e power and environment in order to ac hieve opti­mum performance and c ompliance with applicable industry and g overnmental regu lations. Special attention
must be given in the areas of safety, power distribution, shielding, audible noise control, and temperature regu­lation. In part icular, the drive must be securely mounted in order to guarantee the specified pe rformance c har­acteristics. Mounting by bottom holes must meet the requirements of Section 8.5.

2.1 Standards

The Cheetah 18LP FC family complies with S eagate standards as noted in the appropria te sections of this
manual and the Seagate Fibre Channel Interface Manual, part number 77767496.

The Cheetah 18LP FC disc drive is a UL recognized component per UL1950, CSA certified to CAN/CSA C22.2
No. 950-95, and VDE certified to VDE 0805 and EN60950.

2.1.1 Electromagnetic compatibility

The drive, as deliv e re d , is designed for system integra ti o n a n d installation in to a suitab le e nclosure prior to u se.
As such the drive is supplied as a subassembly and is not subject to Subp art 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.

2.1.1.1 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 dri ve within their s ystems to perform thos e tes ts req uired a nd des i gn
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 1, DC power requirements.

2.1.2 Electromagnetic compliance

Seagate uses an independ ent laboratory to confir m compliance with the direct ives/standards 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:

• 486, Pentium, and PowerPC microproces sors

• 3.5-inch floppy disc drive

• Keyboard

• Monitor/display

• Printer

• External modem

• Mouse

Although the test system with this Seagate model complies with the directives/standards, we cannot guarantee
that all systems will comply. The computer manufacturer or system integrator shall confirm EMC compliance
and provide the appropriate 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 18LP FC Product Manual, 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 Man-
agement Agency (SMA).

2.2 Reference documents

Cheetah 18LP FC Installation Guide

Seagate par t number: 83329430

Fibre Channel Interface Manual

Seagate par t number: 77767496

ANSI Fibre Channel Documents

X3.230-1994 FC Physical and Signaling Interface (FC-PH)
X3.297.1997 FC-PH-2 Fibre Channel Physical and Signaling Interface-2
X3.303.1998 FC-PH-3 Fibre Channel Physical and Signaling Interface-3
X3.272-1996 FC Arbitrated Loop (FC-AL)
X3.269-1996 Fibre Channel Protocol for SCSI (FCP)
NCITS TR-19 Private Loop SCSI Direct Attach (PLDA)
NCITS TR-20 Fabric Loop Attachment (FC-FLA)
SFF-8045 Specification for 40-pin SCA-2 Connector with Parallel Selection.
SFF-8067 Specification for 40-pin SCA-2 Connector with Bidirectional Enclosure Services

Interface.

ANSI Small Computer System Interface (SCSI) Documents

X3.131-1994 (SCSI-2)
X3.270-1996 (SCSI-3) Architecture Model
NCITS 305-199X (SCSI-3) Enclosure Services
30553-001 Specification for Acoustic Test Requirement and Procedures

In case of conflict between this document and any referenced document, this document takes precedence.

Cheetah 1 8LP FC P r od uc t Manual, Rev. D 5

3.0 General description

CheetahTM 18LP FC drives combine dual stripe m agneto re sistive (DSMR) heads, partial respons e/maximum
likelihood (PRML) read channel electronics, embedded servo technology, and a Fibre Channel interface to pro­vide high performance, high capacity da ta storage for a variety of system s includin g engi neering workstations,
network servers, mainframes, and supercomputers.

Cheetah 18LP FC drives are random access storage devices designed to support the Fibre Channel Arbitrated
Loop (FC-AL) and SCSI Fi bre Channel Protocol as de scribed in the ANS I specifications, this document , and
the Fibre Channel Interface Manual (part number 77767496) which describes the general interface characteris­tics of this dri ve. Cheetah 18 LP FC drives are class ified as intelligent peripherals and pr ovide level 2 conform­ance (highest level) with the ANSI SCSI-1 standard.

The head and disc assem bly (HDA) is sealed at the factory. Air recircul ates within the HDA through a non­replaceable filter to maintain a contamination-free HDA environment.

See Figure 2 for an exploded view of the drive. Never disassemble the HDA. This exploded view is for informa­tion only. Do not attempt to service items in the sealed enclosure (heads, media, actuator, etc.) as this requires
special facilities. The drive contains no parts replaceable by the user and opening the HDA for any reason
voids your warranty.

Figure 2. Cheetah 18LP FC disc drive

Cheetah 18LP FC dr ives use a dedicated landing zone at the innermos t radius of the media to el iminate the
possibility of destroying or degrading data by landing in the data zone. The heads automatically go to the land­ing zone when power is removed from the drive.

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

Cheetah 18LP FC drives decode track 0 location data from the servo data embedded on each surface to elimi­nate mechanical transducer adjustments and related reliability concerns.

The drives also use a high-performance actuator assembly with a low-inertia, balanced, patented, straight arm
design that provides excellent performance with minimal power dissipation.

6 Cheetah 18LP FC Product Manual, Rev . D

3.1 S tandard fe atures

Cheetah 18LP FC drives have the following standard features:

• Integrated dual port FC-AL controller

• Concurrent dual port transfers

• Support for FC arbitrated loop, private and public attachment

• Differential copper FC drivers and receivers

• Downloadable firmware using the FC-AL interface

• Support s SCSI enclosure services via interface connector

• 128-deep task set (queue)

• Support s up to 32 initiators

• Drive selection ID and configuration options are set on the FC-AL backpanel or through interface com-

mands. Jumpers are not used on the drive.

• Supports SCSI Enclosure Services through the interface connector

• Fibre Channel worldwide name uniquely identifies the drive and each por t

• User-selectable logical block size (512 to 4,096 bytes per logical block)

• Selectable frame sizes from 128 to 2,112 bytes

• Industry standard 3.5-inch low profile form factor dimensions

• Programmable logical block reallocation scheme

• Flawed logical block reallocation at format time

• Programmable auto write and read reallocation

• Reed-Solomon error correction code

• Sealed head and disc assembly (HDA)

• No preventive maintenance or adjustments required

• Dedicated head landing zone

• Automatic ship ping lock

• Embedded Grey Code track address to eliminate seek errors

• Self-diagnostics performed at power on

• 1:1 interleave

• Zone bit recording (ZBR)

• Vertical, horizontal, or top down mounting

• Dynamic spindle brake

• 1,024 Kbyte data buffer. See Section 4.5

• Embedded servo design

• Reallocation of defects on command (Post Format)

• Fibre Channel interface transports SCSI protocol

3.2 Media description

The media used on the drive has a diameter of approximately 84 mm (approximately 3.3 inches). The alumi­num substrate is coated with a thin film m agnetic material, overcoated with a proprietar y protective layer for
improved durability and environmental protection.

3.3 Performance

• Programmable multi-segmentable cache buffer

• 106 Mbytes/sec maximum instantaneous data transfers per port.

• 10,016 RPM spindle; average latency = 2.99 msec

• Command queuing of up to 128 commands

• Background processing of queue

• Supports start and stop commands

• Adaptive seek velocity; improved seek performance

3.4 Reliability

• 1,000,000 hour MTBF

• LSI circuitry

Cheetah 1 8LP FC P r od uc t Manual, Rev. D 7

• Balanced low mass rotary voice coil actuator

• Self-Monitoring Analysis and Reporting Te chnology (S.M.A.R.T.)

• Dithering

3.5 Unformatted and formatted capacities

Formatted capacity depends on the spare reallocation sectors scheme selected, the number of data tracks per
sparing zone, and the number of alternate sectors (LBAs) per sparing zone. The following table shows the
standard OEM model capacity:

Formatted Unformatted

ST318203FC 21EB390h (18.20) Gbytes 21.6 Gbytes
ST39103FC 10F59C8h (9.1) Gbytes 10.8 Gbytes

Standard OEM models are formatted to 512 bytes per block. You can order other capacities by requesting a dif­ferent sparing scheme and logical block size.

The sector size is 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. ST318203FC
and ST39103FC dr ives use a zone sparing scheme. The dr ive is divided into frequency zones wi th a variable
number of spares in each 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 (6) parameter l ist table in the Fibre Channel Interface Manual, par t number 77 67496. A value of
zero in the Number of Blocks field indicates that the drive will not change the capacity it is currently formatted
to have. A number other than zero and less than the maximum number of LBAs in the Number of B locks field
changes the total drive capacity to the value in the 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 18LP FC Installation Guide (par t number 83329 430).

3.8 Factory-installed options

You may order the following items which are incorporated at the manufacturing facility during production or
packaged 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 nor mally shipped i n bulk packaging to provide max imum 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 18LP FC Installation Gui de, part number 83329 430, is usually included with each standard
OEM drive shipped, but extra copies may be ordered.

3.9 User-installed accessories

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

• Evaluation kit, part number 73473641.
This kit provides an adapter card (“T-card ”) to allow cable connections for two FC ports and DC power. Two
twin axial cables, 6 feet in length, are included for the input and output connections to the FC interface.

• Single-unit shipping pack.

Cheetah 1 8LP FC P r od uc t Manual, Rev. D 9

4.0 Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of
Cheetah 18LP FC drives.

4.1 Internal drive characteristics

ST318203FC ST39103FC

Drive capaci ty 18.2 ................ .. ........9.10........... ................... ..... Gbytes ( formatted, rounded of f value)

Read/write data heads 12 .............................6

Bytes per track 153,284 - 229,045.... 153,284 - 229,045.............Bytes (aver age, rounded of f values)

Bytes per surface 1,913 ................ .. ......1,913......... ............ .. ..........Mbytes (unf ormatted, rounded off v alue)

Tracks per surface (total) 9,801 ........................ 9,801......... ........................ Tracks (user accessible)

Tracks per inch 12,580 ...................... 12,580....... ........................ TPI

Peak bits per inch 252 .......... ............ .....252........ .... ............ .. ..........KBPI

Internal data rate 193-300................. .. .193-300..... ........................Mbits/sec (variable with zone)

Disc rotation speed 10,016 ...................... 10,016....... ........................ rpm (+

Avg r otat ional latency 2.99 ........... .. .......... .. .2.99.......... .........................msec

4.2 Seek performance characteristics

See Section 9.5, "FC-AL physical interface" on page 51 and the Fibre Channel Interface Manual (part number

77767496) for additional timing details.

4.2.1 Access time

0.5%)

Including cont roller overhead
(without disconnect)

Read Write Read Write

Average Typical
Single track Typical
Full s troke Typical

1. Execut ion time measured from receipt of the FCP Command to the FCP Response.

2. Assumes no errors and no sector has been relocated.

3. Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as

measured on a representative sample of drives.

4. Access time = controller overhead + average seek time.

Access to data = contr oller overhead + average seek time + latency time.

3,4

3,4
3,4

5.4 6.0 5.2 5.8

0.7 0.9 0.5 0.7

12.2 13.2 12.0 13.0

1, 2

(msec)

Not including controller overhead
(without disconnect)

1,2

(msec)

4.2.2 Format command execution time for ≥ 512-byte sectors

ST318203FC ST39103FC

Maximum (with verify) 60 minutes 60 minutes
Maximum (without verify) 30 minutes 30 minutes

10 Cheetah 18LP FC Product Manual, Rev. D

4.2.3 General performance characteristics

Minimum sector interleave 1 to 1

Data buffer to/from disc media (one 512-byte logical block)*

Minimum 22.7 MBytes/sec
Average 29.5 MBytes/sec
Maximum 36.2 MBytes/sec

Fibre Channel Interface maximum instantaneous transfer rate 106 Mbytes/sec* per

port (dual port = 212
Mbytes/sec*)

Logical block sizes

Default is 512-byte data blocks
Variable 512 to 4, 096 bytes per sector in even number of bytes per
sector. If n (number of bytes per sector) is odd, then n-1 will be used.

Read/write consecutive sectors on a tr ack

Flaw reall ocation performance impact (for fla w s reallocated at format time
using the spare sect ors per sparing zone real location scheme.)

Overhead time for head switch in sequential mode
Overhead time for one track cylinder switch in sequential mode
Average rotational latency

*Assumes no error s and no reloca ted logi cal b loc k s. Rat e measur ed fro m the s tart of the first logi cal
block transf er to or from the host.

Yes

Negligible

0.8 msec

1.2 msec (typical)

2.99 msec

4.3 Start/stop time

If the Motor Start option is disabled, the drive becomes ready within 30 seconds after DC power is applied. If a
recoverable error condition is detected during the start sequence, the drive executes a recovery procedure and
the time to become ready may exceed 30 s econds. Stop time is less than 30 seconds (maximum) from removal
of DC power.

If the Motor Start opt ion is enabled, the internal controller accepts the comm ands listed in the Fibre Channel
Interface Manual less than 3 seconds after DC power has been applied. After the Motor Star t command has
been received, the drive becomes ready for normal operations within 30 seconds (excluding the error recovery
procedure). The Motor Start comma nd can also be used to command the dr ive to stop the spindle.

There is no power control switch on the drive.

4.4 Prefetch/multi-segmented cache control

The drive provides a prefetch (read look-ahead) and multi-segmented cache control algor ithms that in many
cases can enhance system performance. Cache refers to the drive buffer storage space when it is used in
cache operations. To sele ct this feature, the host sends the Mode Sele ct command with the proper values in
the applicable bytes in page 08h. Prefetch and cache operations are independent features from the standpoint
that each is enabled and disabled independently using the Mode Selec t command; however, in actual opera­tion, the prefetch feature overlaps cache operation somewhat as described in sections 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 Table 16.

Cheetah 1 8LP FC P r od uc t Manual, Rev. D 11

4.5 Cache operation

Note.

Refer to the Fibre Channel Interface Manual for more detail concerning the cache bits.

Of the 1,024 kbytes physical buffer space in the drive, 840 kbytes can be used as a cache. The buffer can be
divided into logical segments (using Mode Select Page 08h, byte 13) from which data is read and to which data
is written.

The drive keeps track of the logical block addresses of the data stored in eac h segment of the buffer. If the
cache is enabled (see RCD bit in the Fibre Channel Int erface Manual), dat a requested by the host with a read
command is retrieved from the buffer, if possible, before any disc access is initiated. If cache operation is not
enabled, the buffer (still segmented with the required number of segments) is still used, but only as circular
buffer s egments during disc medium read operations (disregarding Prefetch operation f or t h e 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 throu gh som e buffer segment on the way to the host. On a c ache
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 the explanation provided with the information about Mode Page 02h (disconnect/
reconnect control) in the Fibre Channel Interface Manual.

The following is a simplified description of the prefetch/cache operation:

Case A

—read command is received and the first logical block is already in the cache:

1. Drive transfers to the initiator the first logical block requested plus all subsequent contiguous logical blocks

that are already in the cache. This data may be in multiple segments.

2. When a requested logical block is reached that is not in any cache segment, the drive fetches it and any

remaining requested logical block addresses from the disc and puts them in a segm ent of the cache. The
drive transfers the remaining requested logical blocks from the cache to the host in accordance with the
Mode Select Disconnect/Reconnect parameters, page 02h.

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, and the first logical block is not in any segment of the cache:

1. The drive fetches the requested logical blocks from the disc and transfers them into a segment, and then

from there to the host in accordance with the Mode Select Disconnect/Reconnect parameters, page 02h.

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

During a prefetch, the drive crosses a c ylinde r boundary to fetch data only if t he Di sco ntinuity (DISC) bit is s et
to 1 in bit 4 of byte 2 of the Mode Select parameters page 08h. Default is zero for bit 4.

Each cache segment is actually a self-contained circular buffer whose length is an integer number of logical
blocks. The wrap-around capability of the individual segments greatly enhances the cache’s overall perfor­mance, allowing a wide range of user-se lectable configurations. The drive supports op eration of any integer
number of segments f rom 1 to 16. Divide t he 967. 5 K bytes i n the buffer by the number of segments to get the
segment size. Default is 3 segments.

Note.

The size of each segment is not reported by Mode Sense c ommand page 08h, bytes 14 and 15. The
value 0XFFFF is always reported regardl ess of the ac tual size of the se gme nt. Sendi ng a s ize spec ifi­cation using the Mode Select command (bytes 14 and 15) does not set up a new segment size. If the
STRICT bit in Mode page 00h (byte 2, bit 1) is set to one, the drive responds as it does for any attempt
to change an unchangeable parameter.

4.5.1 Caching write data

Write caching is a wri te operation by the drive that makes use of a drive buffer storage area where the dat a t o
be written to the medium is stored while the drive performs the Write command.

If read caching is enabled (RCD=0), then data written to the medium is retained in the cache to be made avail­able for future read cache hits. T he s am e buffer space and segmentation is used as set u p for read func tions.
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.

12 Cheetah 18LP FC Product Manual, Rev. D

If the number of write data logical blocks exceed 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.

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.

Table 16 shows the mode default settings for the drive.

4.5.2 Prefetch operation

If the Prefetch feature is enabled, data in c ontiguous logical blocks on the disc immediately beyond that wh ich
was requested by a Read command are retrieved and stored in the buffer for immediate transf er from the buffer
to the host on subs equent Read com man ds t hat reques t t hos e logical blocks (this is tr ue 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.

To enable Prefetch, use 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 segments, 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 Mode parameters
page 08h, byte 2, bit 4 is set to 1 (Discontinuity--DISC bit).

When prefetch (read look-ahead) is enabled (enabled by DRA = 0 ), it operates under the control of A RLA
(Adaptive Read Look-Ahead). If the host uses software interleave, ARLA enables pref etch of contiguous blocks
from the disc when it s enses that a p refetch 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.

Cheetah 1 8LP FC P r od uc t Manual, Rev. D 13

5.0 Reliability specifications

The following reliability specifications assume correct host and drive operational interface, including all inter­face timings, power supply voltages, environmental requirements and drive mounting constraints

See k error ra t e :
Read Error Rates

Recovered Data
Unrecovered Data
Miscorrected Data

Interface error rate:

1

Less than 10 errors in 10

Less than 10 errors in 10
Less than 1 sector in 10
Less than 1 sector in 10
Less than 1 error in 10

Less than 1 error in 10

See Section 9.6.4, "Differential PECL input." on page 59
MTBF: 1,000,000 hours
Service life: 5 years
Preventive maintenance: None required

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 manual assume the following:

• The drive is operated in accordance with this manual using DC power as defined in paragraph 6.2, "DC
power requirements."

• The drive has been formatted with the FC-AL Format command.

• Errors caused by media defects or host system failures are excluded from error rate computations.

• Assume random data.

8

seeks

12

bits transferred (OEM default settings)

15

bits transferred

21

bits transferred

12

bits transferred with minimum receive eye.

14

bits transferred with typical receive eye.

5.1.0.1 Interface errors

An interface error is defined as a failure of the receiver on a port to recover the data as transmitted by the
device port connected to the receiver. The error may be detected as a running disparity error, illegal code, loss
of word sync, or CRC error. The total error rate for a loop of devices is the sum of the individual device error
rates.

5.1.1 Environmental interference

When evaluating systems operation under conditions of electromagnetic interference (EMI), the performance
of the drive within the s ystem is co nsidered acceptable if the drive does not g enerate an unrecoverable condi­tion.

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

• is not detected and corrected by the drive itself

• is not detected from the error or fault status provided through the drive or FC-AL interface

• is not recovered by normal drive or system recovery procedures without operator intervention

5.1.2 W rite err ors

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 that cannot be c orrecte d wi thin two at tempts
at writing the record with a read verify after each attempt (excluding media defects).

5.1.3 Seek errors

A seek error is defined as a failure of the drive to position the heads to the address ed track. After detecting an
initial seek error, the drive automatically performs an error recovery process. If the error recovery process fails,
a seek positioning error (15h) is repo rted with a Medium error (3h) or Hardware error (4h) repo rted in the

14 Cheetah 18LP FC Product Manual, Rev. D

Sense Key. This is an unrecoverable seek error. Unrecoverable seek errors are class ified a s failures for MTBF
calculations. Refer to the Fibre Channel Interface Manual, part number 77767496, for Request Sense informa-
tion.

5.2 Reliability and service

You can enhance the reliab ility of Cheetah 18L P FC disc drives by ensuring that the drive receives adequat e
cooling. Section 6.0 provides recommended air-flow information, temperature me asurements, and othe r infor­mation, which you can use to enhance the service life of the drive.

5.2.1 Mean time between failure (MTBF)

The production disc drive achieves an MTBF of 1,000,000 hours when operated in an environment that
ensures the case temperatures spec ified in Section 6.4.1 a re not exceeded. Shor t-term excursions up t o the
specification limits of the operating environment will not affect MTBF performanc e. Op erating the dr ive at case
temperatures above these values wil l adversely affect the drive’s ability to meet specifications. See Section 6.4,
"Environmental limits".

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

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

Number of drive failures in the period

Estimated power-on operating hours means power-on hours per disc drive times the total number of disc drives
in service. Each disc drive must have accumulated at least nine months of operation. Data is 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

• Read/seek/write operation during 20% of power-on hours

• Operating at nominal voltages

• System provides adequate cooling to ensure the case temperatures specified in Section 6.4.1 are not

exceeded.
Drive failure means any stoppage or failure to meet defined specifications 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 Field failure rate vs time

The expected field failure rate is liste d b elo w. Drive utiliz ation will var y. An estimate rang e of uti liz a t ion is :

• 720 power-on hours (POH) per month

• 250 on/off cycles per year

• Read/seek/write operation 20% of POH

• System provides adequate cooling to ensure the case temperatures specified in Section 6.4.1 are not

exceeded.

Month P arts per million (PPM)

1 2,364
2 1,422
3 1,403
4 1,391
5 1,317
6 1,255
7 1,162
8+ 1,025

Cheetah 1 8LP FC P r od uc t Manual, Rev. D 15

Failure rate is calcula t ed as follows:

• No system-induced failures counted

• PPM targets include 30% no defect found and handling failures

• Based on 1,000,000 MTBF and 720 POH per month

• Month 1’s rate includes a 300 PPM installation failure

5.2.3 Preventive maintenance

No routine scheduled preventive maintenance is required.

5.2.4 Service life

The drive has a useful service li fe of five years. Depot repair or replacement of major par ts is permitted during
the lifetime.

5.2.5 Service philosophy

Special equipment is required to repair the d rive HDA. To achieve the above service life, repairs must be per­formed only at a properly equi pped and staffed Seagate s erv ice and repa ir facility. Troubleshooting and rep air
of PCBs in the field is not recommended becaus e of the extensive diagnostic equipment required for effective
servicing. There are not spare par ts available for this drive. The drive warranty is voided if the HDA is opened.

5.2.6 Service tools

No special tools are required for site installation or recommended for site maintenance. Refer to Section 5.2.5.
The depot repair philosophy of the drive precludes the necessity for special tools. Field repair of the drive is not
practical because users cannot purchase individual par ts for the drive.

5.2.7 Hot plugging the driv e

Inserting and re moving the drive on the FC-AL will interrup t loop operation. The interruption occurs when the
receiver of the next device in the loop must synchronize to a dif ferent input signal. FC e rror detection mec ha­nisms, character sync, running disparity, word sync, and CRC are able to detect any error. Recov e ry is initiated
based on the type of error.

The disc drive defaults to the FC-AL Monitoring state, Pass-through state, when it is powered-on by switching
the power or hot plugged. The control line to an optional port bypass circuit (external to the dr ive), defaults to
the Enable Bypass state. If the bypass circuit is present, the next device in the loop will continue to receive the
output of the previous device to the newly inserted device. If the bypass circuit is not present, loop operation is
temporarily disrupted until the next device starts receiving the output from the newly inserted device and
regains synchronization to the new input.

The Pass-through state is disabled while the drive performs self test of the FC interface. The control line for an
external port bypass circuit remains in the Enable Bypass state while self test is running. If the bypass circuit is
present, loop operation may continue. If the bypass circuit is not present, loop operation will be halted while the
self test of the FC interface runs.

When the self test completes successfully, the control line to the bypass circuit is disabled and the drive enters
the FC-AL Initializing state. The receiver on the next device in the loop must synchronize to output of the newly
inserted drive.

If the self-test fails, the control line to the bypass circuit remains in the Enable Bypass state.

Note.

It is the responsibility of the systems integrator to assure that no temperature, energy, voltage hazard,
or ESD potential hazard is presented during the hot connect/disconnect operation. Discharge the static
electricity from the drive carrier prior to inserting it into the system.

Caution.

The drive motor must come to a complete stop prior to changing the plane of operation. This time is
required to insure data integrity.