seagate Barracuda 180FC Product Manual

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Barracuda 180FC Disc Drive

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ST1181677FC/FCV

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Product Manual, Volume 1

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Barracuda 180FC Disc Drive

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ST1181677FC/FCV

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Product Manual, Volume 1

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Publication number: 100107693, Rev. A

Seagate, Seagate Te chnology, and the Seagate logo are regi stered trademarks of Seagate Te chnology LLC. Barracuda, SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either registered trademar ks or trademar ks 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.

Printed in the United States of America

Revision status summary sheet

Revision Date Writer/Engineer Sheets Affected

A 07/05/2001 L. Newman/J. Nowitzke 1/1, v thru viii, 1 thru 68.

Notice. Product Manual 100107693 is Volume 1 of a two volume document with the SCSI Interface information

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

75789509.

Barracuda 180FC Product Manual, Rev. A 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 description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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

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

4.5.3 Optimizing cache performance for desktop and server applications . . . . . . . . . . . 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.1 Mean time between failure (MTBF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 the drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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

5.2.8 Drive Self Test (DST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.9 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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

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

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

6.2.1 Conducted noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

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

6.3 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.4 Environmental limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.4.1 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

vi Barracuda 180FC Product Manual, Rev. A

6.4.3 Effective altitude (sea level). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

6.4.6 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

6.4.7 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

7.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

7.1 Drive internal defects/errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

7.2 Drive error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

7.3 FC-AL system errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

8.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

8.1 Drive ID/option selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

8.2 LED connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

8.2.1 J6 connector requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

8.3 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

8.4 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

8.5 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

8.6 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

9.0 Interface requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

9.1 FC-AL features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

9.1.1 Fibre Channel link service frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

9.1.2 Fibre Channel task management functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

9.1.3 Fibre Channel task management responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

9.1.4 Fibre Channel port login. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

9.1.5 Fibre Channel port login accept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

9.1.6 Fibre Channel Process Login. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

9.1.7 Fibre Channel Process Login Accept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

9.1.8 Fibre Channel fabric login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

9.1.9 Fibre Channel fabric accept login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

9.1.10 Fibre Channel Arbitrated Loop options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

9.2 Dual port support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

9.3 SCSI commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

9.3.1 Inquiry data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

9.3.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

9.4 Miscellaneous operating features and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

9.5 FC-AL physical interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

9.5.1 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

9.5.2 Connector requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

9.5.3 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

9.5.4 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

9.5.5 FC-AL transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.5.6 Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.5.7 Fault LED Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.5.8 Active LED Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.5.9 Enable port bypass signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

9.5.10 Motor start controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

9.5.11 SEL_6 through SEL_0 ID lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

9.5.12 Device control codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

9.6 Signal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

9.6.1 TTL input characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

9.6.2 LED driver signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

9.6.3 Differential PECL output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

9.6.4 Differential PECL input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

10.0 Seagate Technology support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

Barracuda 180FC Product Manual, Rev. A vii

List of Figures

Figure 1. Barracuda 180FC family disc drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Barracuda 180FC disc drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3. Typical ST1181677FC drive +12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 4. Typical ST1181677FC drive +5V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 5. ST1181677FC DC current and power vs. input/output operations per second . . . . . . . . . . . 22

Figure 6. Location of the HDA Temperature check point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 7. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 8. Mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 9. Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 10. LED indicator connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 11. Air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 12. Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 13. Port bypass circuit physical interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 14. FC-AL SCA device connector dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Figure 15. J6 connector dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Figure 16. FC-AL transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Figure 17. Transmit eye diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 18. Receive eye diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Barracuda 180FC Product Manual, Rev. A 1

1.0 Scope

This manual describes Seagate Technology® LLC, Barracuda 180FC (Fibre Channel) disc drives. Barracuda 180FC dr ives support the Fibre Ch annel Arbitrated Loop an d SCSI Fibre C hannel Proto col spec ifi-

cations to the extent describe d in this manual. The Fibre Channel In terface Manual (part number 77767496) describes the ge neral Fibre Channel Arbitrated Loop character istics of t his and othe r Seagate Fibre Channel drives.

Figure 1. Barracuda 180FC family disc drive

2 Barracuda 180FC Product Manual, Rev. A

Barracuda 180FC Product Manual, Rev. A 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 i ts host equip ment to provide adequ ate power and environment i n order to achieve optimum performance and compli ance with applicable industry and governm ental 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 secur e ly mounted in order to guara ntee the s pec if ied per for ma nc e char acteristics. Mounting by bottom holes must meet the requirements of Section 8.5.

2.1 Standards

The Barracuda 180FC family complies with Seagate sta ndards as noted in the approp riate sections of this manual and the Seagate Fibre Channel Interface Manual, part number 77767496.

The Barracuda 180FC 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 delivered, is designed for system integration and installation into a suitable enclosure prior to use. As such the drive is suppli ed as a subassembly and is not su bject to Subpar t 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 req uirements in their syst em. Shielded I/O cables may be required if the e nclosure does not provide ad equate sh ielding. If the I/O c ables are externa l 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 per formance requ irements. It is the responsibility of tho se integrating the dr ive within their sy stem s to perform thos e tests req uired and design their system to ensu re that equipment operating in the sam e system as the drive or external to the s ystem does not adversely affect the performance of the drive. See Section 5.1.1 and T ab le 1, DC power requirements.

2.1.2 Electromagnetic compliance

Seagate uses an indep endent laborator y to confir m compliance wi th the directives/standar ds 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 with the directives/standards, we cannot guarantee

that all systems will comply. The computer manufacturer or system i ntegrator shall confir m EMC complian ce and provide the appropriate marking for their product.

Electromagnetic compliance for the European Union

If this model has the CE Marki ng it complies with the European Union requirem ents of the Electromagnetic Compatibility Direc tive 89/336/EEC o f 03 May 1989 as ame nded by Direct ive 92/31/EE C of 28 Ap r il 1992 an d Directive 93/68/EEC of 22 July 1993.

4 Barracuda 180FC Product Manual, Rev. A

Australian C-Tick

If this model has the C-Tick Markin g it complies with the Australia/New Zea land Standard A S/NZS3548 199 5 and meets the Electro magnetic 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 Articl e 11 of the Ele ctromagneti c Compatib ility (EM C) Control Regu lation and meets th e Electroma gnetic Compatibility Framework requirements of the Radi o Research Laboratory (RRL) Minis try of Information and Communication Republic of Korea.

Taiwanese BSMI

If this model has two Chinese words meani ng “EMC cer ti fication ” followed by an eight digit identification number, as a Marking, it complies with Chinese Na tional Standard (CNS) 13438 and meets the Electromagnetic Compatibility (EMC) Framework requirements of the Taiwanese Bureau of Standa rds, Metrology, and Inspection (BSMI).

2.2 Reference documents

Barracuda 180FC Installation Guide

Seagate part number: 100107697

Fibre Channel Interface Manual

Seagate part 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

Specification for Acoustic Test Requirement and Procedures

Seagate part number: 30553-001

Package Test Specification Seagate P/N 30190-001 (under 100 lb.) Package Test Specification Seagate P/N 30191-001 (over 100 lb.)

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

Barracuda 180FC Product Manual, Rev. A 5

3.0 General description

BarracudaTM 180FC drives combine giant magnetoresistive (GMR) heads, p artial response/maximum likelihood (PRML) read channel ele ctronic s, embedded servo technology, and a Fibre Channel interface to provide high performance, high capaci ty data storage for a variety of syste ms inc luding en ginee ring work statio ns, network servers, mainframes, and supercomputers.

Barracuda 180FC drives are random access storage devices designed to support the Fibre Channel Arbitrated Loop (FC-AL) and SCSI Fibre Cha nnel Protocol as descr ibed in the ANSI specificatio ns, this document, and the Fibre C hannel Interface Manual (part number 77767 496) which d escr ibes the general i nterface character- istics of this drive. Barracuda 18 0FC drives are classified as intelligen t peripherals and provide level 2 conformance (highest level) with the ANSI SCSI standard.

The head and disc as sembly (HDA) is sealed at the factory. Air recirculates withi n 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 conta ins no parts replace able by the user and openin g the HDA for any reason voids your warranty.

Figure 2. Barracuda 180FC disc drive

Barracuda 180FC dr ives use a dedicated land ing zone at the inner most radius of the me dia to eliminate th e 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 handl ing. The shipping lock disengages and the head lo ad process begins when power is applied to the drive.

Barracuda 180FC 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 Barracuda 180FC Product Manual, Rev. A

3.1 Standard features

Barracuda 180FC 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

• Supports SCSI enclosure services via interface connector

• 128-deep task set (queue)

• Supports up to 32 initiators

• Drive selection ID and configuration options are set on the FC-AL backpanel or through interface commands. Jumpers are not used on the drive.

• Fibre Channel worldwide name uniquely identifies the drive and each port

• User-selectable logical block size (512 to 704 bytes per logical block)

• Selectable frame sizes from 256 to 2,112 bytes

• Industry standard 3.5-inch half high 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 shipping 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

• 4,096 Kbyte data buffer (16,384 Kbytes on FCV drives). 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 dr ive has a di ameter of a pproximately 84 mm (approximat ely 3.3 in ches). The aluminum substrate is coate d with a thin film magnet ic material, overcoated wi th 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 (212 Mbytes/sec with 2 GHz link rate)

• 7,200 RPM spindle. Average latency = 4.17 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

• 1,200,000 hour MTBF

• LSI circuitry

• Balanced low mass rotary voice coil actuator

Barracuda 180FC Product Manual, Rev. A 7

• Self-Monitoring Analysis and Reporting Technology (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 (LB As) per sparing zone. The following table shows the standard OEM model capacity:

Formatted Unformatted

ST1181677FC/FCV 1522c441h (181.6 Gbytes) 241.9 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 obtai n different formatted capacit ies than those liste d. Barracuda 180FC drives use a zone spari ng s cheme. The drive is divided into frequency zones wi th a vari able number of spares in each zone.

Note. For 2 gigabit operation, sector sizes must be divisible by 8.

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) param eter list table in the F ibre Chann el Inter face Manual, par t number 7767496 . A value of zero in the Number of Blocks field indica tes that the dr ive will not change the ca pacity it is curren tly formatted to have. A number other than zero and less than the maximum number of LBAs in th e Number of Bl ocks field changes the total dr ive capacity to the value in th e Num ber of Bl ocks field. A value greater tha n the ma ximum number of LBAs is rounded down to the maximum capacity.

3.7 Factory-installed accesso r ies

OEM standard drives are shipped with the Barracuda 180FC Installation Guide (part number 100107697).

3.8 Factory-installed options

You may order the following items which are incorporated at the m anufacturing facility durin g 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 p ack. The drive is nor mally shipped in bulk packag ing to provide maximum pro tection against transit damage. Units shipped individually require additional protection as provided by the single unit shipping pack. Users planning single unit distribution should specify this option.

• The Barracuda 180FC I nstallation Guide, par t number 100107697, is usually included with eac h standard OEM drive shipped, but extra copies may be ordered.

• The Safety and Regulator y Agency Specifications, par t number 75789512, is usually inc luded 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.

• Single-unit shipping pack.

8 Barracuda 180FC Product Manual, Rev. A

Barracuda 180FC Product Manual, Rev. A 9

4.0 Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Barracuda 180FC drives.

4.1 Internal drive characteristics

ST1181677FC/FCV

Drive capacity 181.6 ........................Gbytes (formatted, rounded off value)

Read/write data heads 24

Bytes per track 406,071 ....................Bytes (average, rounded off values)

Bytes per surface 19,263 ......................Mbytes (unformatted, rounded off value)

Tracks per surface (total) 24,247 ......................Tracks (user accessible)

Tracks per inch 31,200 ......................TPI

Peak bits per inch 490 ...........................KBPI

Internal data rate 282-508....................Mbits/sec (variable with zone)

Disc rotation speed 7,200 ........................rpm (+

Avg rotational latency 4.17 ..........................msec

4.2 Seek performance characteristics

4.2.1 Access time

0.5%)

Including controller overhead (without disconnect)

1, 2

(msec)

Not including controller overhead (without disconnect)

1,2

(msec)

Read Write Read Write

ST1181677FC

Average Typical Single track Typical Full stroke Typical

3,4

3,4 3,4

7.6 8.4 7.4 8.2

1.0 1.3 0.8 1.1

16.2 17.2 16.0 17.0

1. Execution 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 = controller overhead + average seek time + latency time.

4.2.2 Format command execution time for ≥ 512-byte sectors

ST1181677FC/FCV

Maximum (with verify) 210 minutes Maximum (without verify) 120 minutes

10 Barracuda 180FC Product Manual, Rev. A

4.2.3 General performance characteristics

Minimum sector interleave 1 to 1

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

Minimum 25.3 MBytes/sec Average 36.1 MBytes/sec Maximum 47.0 MBytes/sec

Fibre Channel Interface maximum instantaneous transfer rate 1 GHz

106 Mbytes/sec* per port (dual port = 212 Mbytes/sec*)

Logical block sizes

Default is 512-byte 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

Flaw reallocation performance impact (f or flaws realloca ted at format time using the spare sectors per sparing zone reallocation scheme.)

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

*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or

from the host.

Yes

Negligible

0.8 msec

1.2 msec (typical)

4.17 msec

2 GHz 212 Mbytes/sec* per port (dual port = 424 Mbytes/sec*)

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 seconds. Stop time is less than 30 seconds (maximum) from removal of DC power.

If the Motor Star t option is enabled, the i nternal contr oller accepts th e commands list ed in the Fibre Channel Interface Manual less than 3 second s after DC power has b een applied. A fter the Motor St art command has been received, the drive becomes ready for normal operations within 30 seconds (excluding the error recovery procedure). The Motor Start command can also be used to command the drive 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 con trol algorithms that in many cases can enhance s ystem performance. Cache refers to the drive buffer storage space when it is used in cache operations. To select this feature, the hos t sends the Mod e Select command with the proper values i n the applicable bytes in page 08h. Prefetch and cache operations are indep end ent features from the sta ndp oin t that each is en abled and disabled ind ependently us ing the Mode Select comm and; 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 pa rameter values (Mode Page 08h) for standard OEM versions of this drive family are given in Table 15.

Barracuda 180FC Product Manual, Rev. A 11

4.5 Cache operation

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

Of the 4,096 kbytes physical buffer space i n the drive, 3,600 kbytes (14,399 k bytes of the 16,384 kbytes on FCV units) 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 stor ed in each segment of the buffer. If the cache is enabled (see RCD bit in the Fibre Ch ann el Interface Manual ), data requested by the host with a r ea d command is retr ieved from the buffer, if possible, before any disc access is initia ted. If ca che operation is not enabled, the buffer (still segmented with the required number of segm ents) is still used, but only a s 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 thr ou gh some buffer segment on the way to the host. On a cach e 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 logica l block is reached that is not in any cache seg ment, the drive fetches it and any

remaining requested logical block addresses fr om the disc and pu ts them in a se gment of the ca che. The drive transfers the remaining requested log ical 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 logic al blocks from the disc and transfers them into a segment, and the n

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 cylinde r boundary to fetch data only if the Discontinuity (D ISC) bit is se t 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 circ ular 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-selectable configu rations. The drive supports operati on of any integer number of segments from 1 to 16. Div ide th e 3,600 K bytes in the buffer by the number of se gments to get th e segment size. Default is 3 segments.

Note. The size of each segment is not repo r ted by Mode Sense c ommand pa ge 08h, bytes 14 and 15. The

value 0XFFFF is always reported regardless of the actual size of the segment. Sending a size specification using the Mode Selec t co mmand (bytes 14 a nd 15) does not set up a new seg ment s ize. 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 wr ite op eration by the dr ive that makes use of a drive buffer storage area where the data t o be written to the medium is stored whil e the drive p erforms 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 segme ntat ion is u sed a s set up 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 co mmand is issued, if RCD=0 , the cache is first checked to see if any logical blocks that

12 Barracuda 180FC Product Manual, Rev. A

are to be writte n are already stored in the cach e from a previous read or write comman d. If there are, the respective cache segments are cleared. The new data is cached for subsequent Read commands.

If the number of write data logical blocks exceed the size of the 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 begin nin g of the operat ion ; 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 15 shows the mode default settings for the drive.

4.5.2 Prefetch operation

If the Prefetch feature is enabled, data in conti guous lo gical blocks on the disc immedia tely b eyond that which was requested by a Read command are retrieved and stored in the buffer for immediate transfer from the buffer to the host on subsequent Rea d comma nds tha t request th ose log ical blocks (this is tr ue even if cache operation is disabled). Though the pr efetch operation uses the buffer as a cache, finding the reques ted data in the buffer is a prefetch hit, not a cache operation hit.

To enable Prefetch, us e Mode Select page 08h, byte 12, bit 5 (Disable Read Ahea d - DRA bit). DRA bit = 0 enables prefetch.

Since data that is prefetched replaces data already in som e buffer segments, the host can limit the amoun t of prefetch data to optimize system perform ance. 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 cross es a cy linder bou nda ry 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-ahe ad) 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 sense s that a prefetch hit will l ikely 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 softwa re interleave, and if two sequential read operations are not for contiguous blocks of data , ARL A d isables pre fetch, but as long as s equ enti al read oper ations 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 r espond quickly to repetiti ve accesses of multiple s mall segments of dat a without taking the time to “ look ahea d” to the next contiguous s egments of da ta. In a ser ver environment, you want to configure the cac he to provide large volumes of sequential data in a non-repetitive manner. In this case, the ability of the cache to “look a head” to the next contiguous segments of sequential data is a good thing.

The Performance Mode (PM) bit contr ols the way the drive switches the cache buffer into different modes o f 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. For additional information about th e PM bit, refer to the Unit Attention Parameters page (00h) of the Mode Sense command (1Ah) in the Fibre Channel Interface Product Manual, part number 77767496.

Barracuda 180FC Product Manual, Rev. A 13

5.0 Reliability specifications

The following reliability speci fications assume correc t host and drive operational in terface, including all interface timings, power supply voltages, environmental requirements and drive mounting constraints

Seek error rate: Read Error Rates

Recovered Data Unrecovered Data Miscorrected Data

Interface error rate:

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 57 MTBF: 1,200,000 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.

seeks

bits transferred (OEM default settings)

bits transferred

bits transferred with minimum receive eye.

bits transferred with typical receive eye.

5.1.0.1 Interface errors

An interface error is defin ed as a failure of the receiver on a por t 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 indi vidual device error rates.

5.1.1 Environmental interference

When evaluating systems operation under condi tions of electrom agnetic inter ference (EMI), the perfor mance of the drive within the system is consid ered ac ceptable if t he dri ve does not gene rate an unrec overable 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 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 beca use of a n equipm ent mal functi on in the dr ive, the error is classi fied as a failure affecting MTBF. Unrecoverable write errors are thos e that ca nnot be cor rected wi thin two attem pts 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 o f the dr i ve to posi tio n th e hea ds to th e ad dr esse d track. After d etec ti ng a n initial seek error, the drive automatically performs an error recovery process. If the error recovery process fails, a seek positionin g error (15h) is report ed with a Medium error (3h) or Hard ware error (4h) repo rted in the

14 Barracuda 180FC Product Manual, Rev. A

Sense Key. Thi s is a n unrecoverable seek error. Unrecoverable seek errors are cl assi fie d a s failures for MTBF calculations. Refer to the Fibre Channel Interface Manual, part number 77767496, for Request Sense information.

5.2 Reliability and service

You can enhan ce the reliabili ty of Barracuda 180F C disc drives by ensur ing that the dr ive receives adequate cooling. Section 6 .0 provides re commende d air-flow inform ation, temp erature measur ements, and oth er 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 1,200,000 hours when operated in an environment that ensures the case temperatures spec ified in Sectio n 6.4.1 are not exceeded. Shor t-ter m excursions up to the specification limits of th e op erati ng e nvironmen t wi ll not a ffect MTBF p er formanc e. Ope rating th e drive at case temperatures above these values will 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 mea s urement period = Es timated pow er-on operat ing 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 servic e. Each disc dr ive must have accumulated at least ni ne months of op eration. Data is c alculated 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

• 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. p redi ctive failure indicates th at the d r ive is deter iora ting to an imm inent failure and is consi dere d

an MTBF hit.

5.2.2 Preventive maintenance

No routine scheduled preventive maintenance is required.

5.2.3 Service life

The drive has a usefu l service life of five years. Depot repair or repl ac eme nt o f major parts is pe rmitted durin g the lifetime.

5.2.4 Service philosophy

Special equipment i s requir ed to repa ir the dr ive HDA. To achieve the above service life, repairs must be performed only at a proper ly equ ipped and s taffed Seagate ser v ice and r epair facili ty. Troubleshooting and repa ir of PCBs in the field is not recommen ded becaus e of the extensive diagnostic equipm ent requir ed for effective servicing. There are not spare parts available for this drive. The drive warranty is voided if the HDA is opened.

5.2.5 Service tools

No special tools are requi red for site instal lat ion or recomm ended 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 because users cannot purchase individual parts for the drive.

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