seagate ST150176FC Installation guide
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Barracuda 50FC Disc Drive
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ST150176FC
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Product Manual, Volume 1
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Barracuda 50FC Disc Drive
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ST150176FC
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Product Manual, Volume 1
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© 1999 Seagate Technolog y, Inc. All rights reserved
December 1999
Publication number: 83329473, Rev. C
Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Technology, Inc. Barracuda, 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 7/27/99 L. Newman/D. Rusch 1/1, v thru viii, 1 thru 70.
B 8/9/99 L. Newman/D. Rusch 5.
C 12/14/99 L. Newman/G. Velaski Pages 14 and 47 (mode sense data).
Barracud a 50FC Pr oduct Manual, Rev. C vii
Contents
1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.0 Applicable standards and reference documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1.1 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.3 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.4 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.5 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0
4.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.0 Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.0.1 Interface errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.4 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
viii Barracuda 50FC Produ ct Ma n ua l , Rev . C
6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
6.4.3 Effective altitude (sea level). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
6.4.4 Shock and vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
6.4.4.1 Shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
6.4.4.2 Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
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
8.4.1 Air flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
8.5 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
8.6 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
9.0 Interface requiremen ts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
9.1 FC-AL features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
9.1.1 Fibre Channel link service frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
9.1.2 Fibre Channel task managem ent functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
9.1.3 Fibre Channel task managem ent respons es . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
9.1.4 Fibre Channel port login. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
9.1.5 Fibre Channel port login accept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
9.1.6 Fibre Channel Proc ess Login. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
9.1.7 Fibre Channel Proc ess Login Accept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
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 con ditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
9.5 FC-AL physical interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
9.5.1 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
9.5.1.1 Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
9.5.2 Connector requirem ent s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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 signal s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
9.5.10 Motor start controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
9.5.11 SEL_6 through SEL_0 ID lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
9.5.11.1 Parallel Enclosure Services Interface (ESI) . . . . . . . . . . . . . . . . . . . .54
9.6 Signal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
9.6.1 TTL input characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
9.6.2 LED driver signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Barracud a 50FC Pr oduct Manual, Rev. C ix
9.6.3 Differential PECL output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.6.4 Differential PECL input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
10.0 Seagate Technology support services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
x Barracuda 50FC Produ ct Ma n ua l , Rev . C
Barracud a 50FC Pr oduct Manual, Rev. C xi
List of Figures
Figure 1. Barracuda 50FC family disc drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Barracuda 50FC disc drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Typical Barracuda 50FC drive +12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 4. Typical Barracuda 50FC drive +5V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 5. DC current and power vs. input/output operations per second . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 6. Locations of PCBA components listed in Table 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 connec tor dimen sions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
Barracud a 50FC Pr oduct Manual, Rev. C 1
1.0 Scope
This manual describes Seagate Technology®, Inc. Barracuda 50FC (Fibre Channel) disc drives.
Barracuda 50FC drives support the Fibre Channel Arbitrated Loop and SCSI Fibre Channel Protocol specifica-
tions to the extent described i n this manual. The Fibre Channel Interface Manual (par t number 77767496)
describes the general Fibre Channel Arbitrated Loop characteristics of this and other Seag ate Fibre Channel
drive s.
Figure 1.
Barracuda 50FC
family disc drive
Barracud a 50FC Pr oduct Manual, Rev. C 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 Barracuda 50FC family complies with Seagate standards as noted in the appropriate sections of this manual and the Seagate Fibre Channel Interface Manual, part number 77767496.
The Barracuda 50FC disc dri ve is a UL reco gnized 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 d esigned for system integ ration and installation i nto 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 d rive. See Section 5.1.1 on page 13 and Table 1, DC power
requirements, on page 19.
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 microprocessors
• 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 Barracuda 50FC Produ ct Ma n ua l , Rev . C
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
Barracuda 50FC Installation Guide
Seagate par t number: 83329474
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.
Barracud a 50FC Pr oduct Manual, Rev. C 5
3.0 General description
BarracudaTM 50FC drives combine dual striped magnetore sistive heads, parti al response/maximum likelihood
(PRML) read channel e lectronics, embedded ser vo technology, an d a Fibre Channel in terface to provide high
performance, high capacity data storage for a variety of systems including engine ering workstations, network
servers, mainframes, and supercomputers.
Barracuda 50FC drives are random access storage devices designed to suppor t 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 drive. ST150176FC drives are classified as intelligent per ipherals and provide 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. Barracuda 50FC disc drive
Barracuda 50FC drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibility of destroying or degrading data by landing in the data zone. The 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.
Barracuda 50FC drives decode track location data from the servo data embedded on each surface to eliminate
mechanical transducer adjust m ents and re lated r eliability 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 50FC Produ ct Ma n ua l , Rev . C
3.1 S tandard featu r es
Barracuda 50FC 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
• 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 3.4 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.
• 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
• 1,000,000 hour MTBF
• LSI circuitry
Barracud a 50FC Pr oduct Manual, Rev. C 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 read capacities data. Tot al LBA s = read capacity data shown below + 1.
Formatted Unformatted
ST150176FC 05D2B03Bh blocks (50 Gb ytes with 512 bytes per block) 63.1 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.
ST150176FC drives use a zone sparing scheme. The drive is divided into frequency zones with 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. To restore the drive to maximum
capacity, enter a value of FFFFFFFF in the Number of Blocks field.
3.7 Factory-installed accessories
OEM standard drives are shipped with the Barracuda 50FC Installation Guide (part number 83329474).
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 Barracuda 50FC Installation Guide, part number 83329474, 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.
Barracud a 50FC Pr oduct Manual, Rev. C 9
4.0 Performance characteristics
This section provides detailed information concerning performanc e-related character isti cs and features of Barracuda 50FC drives.
4.1 Internal drive characteristics
ST150176FC
Drive capaci ty 50.07 .............. .. ........Gbytes (formatted, rou nded off value)
Read/write data heads 22
Bytes per track 189.28 ................... .. .Kbytes (average, rounded off values)
Bytes per surface 2,276 .............. .. ........Mbytes (unformatted, r ounded off value)
Tracks per surface (total) 12,024 ...................... Tracks (user accessible)
Tracks per inch 12,905 ...................... TPI
Pe ak bits per inch 252 .......... .. .. ............ .KBPI
Internal data rate 153-264................. .. .Mbits/sec (variable with zone)
Disc rotation speed 7,184 ........................ rpm (+
Avg r otat ional latency 4.17....................... ...msec
4.2 Seek performance characteristics
See Section 9.5, "FC-AL physical interface" on page 48 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
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
7.6 8.4
0.9 1.2
16 17
1, 2
(msec)
4.2.2 Format command execution time for ≥ 512-byte sectors
ST150176FC
Maximum (with verify) 1 20 minutes
Maximum (without verify) 70 minutes
4.2.3 General performance characteristics
ST150176FC
Minimum sector interlea ve 1 to 1
Data buffer to/from disc media (one 512-byte logical block)*
Minimum 19.1 MBytes/sec
Average 27.8 MBytes/sec
Maximum 33.0 MBytes/sec
Fibre Channel Interface maximum instantaneous transfer rate 106 Mbytes/sec* per
port (dual port = 212
Mbytes/sec*)
10 Barracuda 50FC Product Manual, Rev . C
Logical block size s
Default is 512-byte data blocks
Variable 512 to 4,096 bytes per sect or in n + 4 intervals (n = number
of bytes per sector).
Read/write consecutive sectors on a tr ack Yes
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 1.2 msec
Overhead time for one track cylinder switch in sequential mode 1.2 msec (typical)
Average rotational latency 4.17 msec
*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.
Negligible
4.3 Start/stop time
If the Motor Start option is disabled, the drive becomes ready within 35 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 35 seconds. Stop time is less than 20 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 25 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.
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 (3,600 kbytes of the 4,096 kbytes on units
with this option) can be used as a cache. The buffer can be divided into logical segments (us ing 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 reque sted by the h ost 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
Barracud a 50FC Pr oduct Manual, Rev. C 11
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 one 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 from 1 to 16. Divide the 840 Kbytes (3,600 kbytes on units with the 4,096 kbytes option) in
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. T he
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 dr ive buffer storage area where the dat a to
be written to the medium is stored while the drive performs the Write command.
If read caching is enabled (RCD=0), then data written to the medium is retained in the cache to be made available for future read cache hits. T he s am e buffer space and segmentation is used as set up for read functions.
The buffer segmentation scheme is set up or changed independently, having nothing to do with the state of
RCD . When a write command is issued, if RCD=0, the cache is first checked to see if any logical blocks that are
to be written are already stored in the cache from a previous read or write command. If there are, the respective cache segments are cleared. The new data is cached for subsequent Read commands.
If the number of write data logical blocks 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 m edium. 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.
12 Barracuda 50FC Product Manual, Rev . C
4.5.2 Prefetch operation
If the Prefetch feature is enabled, data in c ontiguous logical blocks on the disc i mm edi ate ly 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 comman ds t hat reques t t hose logical blocks (this is true even if cache operation is disabled). Though the prefetch operation uses the buffer as a cache, finding the requested data in the
buffer is a prefetch hit, not a cache operation hit.
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.
Barracud a 50FC Pr oduct Manual, Rev. C 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
Seek error rate: Less than 10 errors in 10
Read Error Rates
1
Recovered Data Less than 10 errors in 1012 bits transferred (OEM default settings)
Unrecovered Data Less than 1 sector in 10
Miscorrected Data Less than 1 sector in 10
Interface error rate: Less than 1 error in 10
Less than 1 error in 10
See Section 9.6.4, "Differential PECL input." on page 57
MTBF: 1,000,000 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
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 generate 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 orrected wi thin t wo 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 addressed track. There must not be
8
more than ten recoverable seek errors in 10
physical seek operations. After detecting an initial seek error, the
drive automatically performs an error recovery process. If the error recovery process fails, a seek positioning
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