Seagate ST1181677LC, ST1181677LCV, ST1181677LW, ST1181677LWV User Manual
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Barracuda 180 Family:
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ST1181677LW/LWV/LC/LCV
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Product Manual, Volume 1
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Barracuda 180 Family:
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ST1181677LW/LWV/LC/LCV
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Product Manual, Volume 1
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© 2000 Seagate Technology LLC All rights reserved
Publication number: 100109939, Rev. A
November 2000
Seagate, Seagate Technology, and the Seagate logo are registered tradema rks of Seagate Technology LLC.
Cheetah, SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either trademarks or registered trademarks of
Seagate Technology LLC or one of its subsidiaries. All other trademarks or registered trademarks are the property of their respective owners.
Seagate reserves the right to change, without notice, product offerings or specifications. No part of this publica-
tion may be reproduced in any form without written permission of Seagate Technology LLC.
Revision status summary sheet
Revision Date Writer/Engineer Sheets Affected
Rev. A (Class A Release) 11/9/2000 L. Newman/J. Nowitzke 1/1, v thru viii, 1-74.
Notice.
Product Manual 100109939 is Volume 1 of a two volume document with the SCSI interface information
in the SCSI Interface Product Manual, Volume 2, part number 75789509.
If you need the SCSI interface information, order the SCSI Interface Product Manual, Volume 2,
part number 75789509.
Barracuda 180 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 susceptibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.3 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.0 General description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Standard features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Media characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.5 Unformatted and formatted capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.6 Programmable drive capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.7 Factory installed accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.8 Options (factory installed). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.9 Accessories (user installed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Internal drive characteristics (transparent to user). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 SCSI performance characteristics (visible to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.1 Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.2 Format command execution time (minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.3 Generalized performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.3 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.4 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.5 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.0 Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.1 Environmental interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.2 Read errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.3 Write errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.4 Seek errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Reliability and service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2.1 Mean time between failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2.2 Field failure rate vs. time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2.3 Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.4 Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.5 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.6 Service tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.7 Hot plugging Barracuda 180 disc drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.8 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.9 Drive Self Test (DST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.10 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.1 AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2 DC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2.1 Conducted noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2.3 12 V - Current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.3 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.4 Environmental limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
vi Barracuda 180 Product Manual, Rev. A
6.4.1 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6.4.3 Effective altitude (sea level). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
6.4.6 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
6.4.7 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
7.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
7.1 Drive internal defects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
7.2 Drive error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
7.3 SCSI systems errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
8.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
8.1 Drive ID/option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
8.1.1 Notes for Figures 12, 13, and 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
8.1.2 Function description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
8.2 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
8.3 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
8.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
8.5 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
9.0 Interface requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
9.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
9.2 SCSI interface messages supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
9.3 SCSI interface commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
9.3.1 Inquiry Vital Product data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.3.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
9.4 SCSI bus conditions and miscellaneous features supported . . . . . . . . . . . . . . . . . . . . . . . . .48
9.5 Synchronous data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
9.5.1 Synchronous data transfer periods supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
9.5.2 REQ/ACK offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
9.6 Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
9.6.1 DC cable and connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
9.6.2 SCSI interface physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
9.6.3 SCSI interface cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
9.6.4 Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
9.7 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
9.7.1 Multimode—SE and LVD alternatives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
9.8 Terminator requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
9.9 Terminator power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
9.10 Disc drive SCSI timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
9.11 Drive activity LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
10.0 Seagate Technology support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Barracuda 180 Product Manual, Rev. A vii
List of Figures
Figure 1. Barracuda 180 family drive (ST1181677LW shown) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Barracuda 180 family drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Typical Barracuda 180 family drive +12 V current profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 4. Typical Barracuda 180 SCSI SE mode +5 V current profile. . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 5. Typical Barracuda 180 SCSI LVD mode +5 V current profile. . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 6. DC current and power vs. input/output operations per second (single-ended mode) . . . . . . 24
Figure 7. DC current and power vs. input/output operations per second (LVD mode) . . . . . . . . . . . . . 24
Figure 8. Location of the HDA temperature check point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 9. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 10. ST1181677LW/LWV mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 11. ST1181677LC/LCV mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 12. J6 jumper header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 13. J5 jumper header (on LW/LWV models only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 14. J2 option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 15. Suggested air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 16. ST1181677LW/LWV drive physical interface (68-pin J1 SCSI I/O connector). . . . . . . . . . . . 50
Figure 17. ST1181677LC/LCV drive physical interface (80-pin J1 SCSI I/O connector) . . . . . . . . . . . . 50
Figure 18. SCSI daisy chain interface cabling for LW/LWV drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 19. Nonshielded 68 pin SCSI device connector used on LW/LWV drives . . . . . . . . . . . . . . . . . . 54
Figure 20. Nonshielded 80 pin SCSI “SCA-2” connector, used on LC/LCV drives . . . . . . . . . . . . . . . . . 55
Figure 21. LVD output signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 22. Typical SE-LVD alternative transmitter receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Barracuda 180 Product Manual, Rev. A 1
1.0 Scope
This manual describes Seagate Technology® LLC, Barracuda 180™ disc drives.
Barracuda 180 drives support the small computer system interface as described in the ANSI SCSI SPI-3 inter-
face specifications to the extent descri bed in this manual. The SCSI Interface Product Manual (par t number
75789509) describes general SCSI interface characteristics of this and other families of Seagate drives.
From this point on in this product manual the reference to Barracuda 180 mod els is referred to as “the dr ive”
unless references to individual models are necessary.
Figure 1. Barracuda 180 family drive (ST1181677LW shown)
2 Barracuda 180 Product Manual, Rev. A
Barracuda 180 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 secure ly mo unted in order to guarantee the s pec if ied per for ma nc e char acteristics. Mounting by bottom holes must meet the requirements of Section 8.4.
2.1 Standards
The Barracuda 180 family complies with Seagate standards as noted in the appropriate sections of this Manual
and the Seagate SCSI Interface Product Manual.
The Barracuda 180 disc drive is a UL rec ognized component per UL1950 , CSA certifie d to CSA C22.2 No.
950-M89, 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.
2.1.2 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 Table 2, DC power requirements.
2.2 Electromagnetic compliance
Seagate uses an independ ent laboratory to co nfirm compliance to the directives/standard(s) for CE Mark ing
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 microprocessors
• 3.5-inch floppy disc drive
• Keyboard
• Monitor/display
• Printer
• External modem
• Mouse
Although the test system wi th this Seag ate mode l co mpl ie s to the dire cti ves/standa rd(s ), we cann ot gua rante e
that all systems will compl y. The computer manufacturer or system integrator must conf irm EMC complia nce
and provide CE Marking and C-Tick 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 180 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 MIC (Ministry of Information and Communication) Marking it complies with paragraph 1 of
Article 11 of the Electromagnetic Compatibility control Regulation and meets the Electromagnetic Compatibility
(EMC) Framework requirements of the Radio Research Laboratory Ministry of Information and Communication
Republic of Korea.
Tai wan MIC
If this model has two Chinese words meaning “EMC certificat ion” followed by an eigh t digit ide ntificati on 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).
2.3 Reference documents
Barracuda 180 Installation Guide Seagate P/N 100109942
Safety and Regulatory Agency Spec ifi catio ns Seagate P/N 75789512
SCSI Interface Product Manual Seagate P/N 75789509
ANSI small computer system interface (SCSI) document numbers:
T10/1143D Enhanced SCSI Parallel Interface (EPI)
T10/1236D Primar y Comm and s-2 (S PC -2 )
T10/996D SCSI Block Commands (SBC)
T10/1157D SCSI Architectural Mode l-2 (S AM - 2)
T10/1302D SPI-3 (SCSI Parallel Interface version 3)
SFF-8046 Specification for 80-pin connector
Package Test Specification Seagate P/N 30190-001 (under 100 lb.)
Package Test Specification Seagate P/N 30191-001 (over 100 lb.)
Specification, Acoustic Test Requirements, and Procedures Seagate P/N 30553-001
In case of conflict between this document and any referenced document, this document takes precedence.
Barracuda 180 Product Manual, Rev. A 5
3.0 General description
Barracuda 180 drives combine giant magnetoresistive (GMR) heads, partial response/maximum likelihood
(PRML) read channel el ectroni cs, embedd ed ser vo tech nology, and a wide Ultra160 SCSI interface to provide
high performance, high capaci ty data storage for a variety of syste ms incl uding en ginee ring work statio ns, network servers, mainframes, and supercomputers.
The Ultra160 SCSI i nterface uses negotiated transfer rates. These trans fer rates will occur only if your hos t
adapter supports these data transfer rates and is compa tible with the r eq uir e d hardwa re re qui remen ts of the I/
O circuit type. This drive can al so opera te at S CS I-1 and SCS I-2 dat a transfer rates for backward compatib ility
with non-Ultra/Ultra2/Ultra160 SCSI host adapters.
Table 1 lists the features that differentiate the various Barracuda 180 models.
Table 1: Drive model number vs. differentiating features
Number of I/O
Data buffer
Model number
size I/O circuit type [1]
ST1181677LW 4,096 kbytes Single-ended (SE) and low voltage differential (L VD) 68
ST1181677LWV 16,384 kbytes Single-ended (SE) and low voltage differential (LVD) 68
ST1181677LC 4,096 kbytes Single-ended (SE) and low voltage differential (LVD) 80
connector
pins
ST1181677LCV 16,384 kbytes Single-ended (SE) and low voltage differential (LVD) 80
[1] See Section 9.6 for details and definitions.
The drive records and recovers data on approximately 3.3-inch (84 mm) non-removable discs.
The drive suppor ts the Small Computer System Interface (SCSI) as descr ibed in the ANSI SCSI-2/SCSI-3
interface specifications t o the extent described in this manual (volume 1), which defines the product performance characteris tics of the Barracuda 180 family of dr ives, and the SCSI Interface Product Manual, which
describes the general interface characteristics of this and other families of Seagate SCSI drives.
The drive’s interface supports multiple initiators, disconnect/reconnect, self-configuring host software, and
automatic features that relieve the host from the necessity of knowing the physical characteristics of the targets
(logical block addressing is used).
The head and disc assembly (HDA) is sealed at the factory. Air circulates within the HDA through a nonreplaceable filter to maintain a contamination-free HDA environment.
Refer to Figure 2 for an exploded view of the drive. This exploded view is for information only—nev er di sasse mble the HDA and do not attempt to service items in the se aled enc losure (head s, media, actuator, etc.) as this
requires special facilities. The drive contains no replaceable parts. Opening the HDA voids your warranty.
Barracuda 180 drives use a ded icate d landi ng zone at the in ner most rad ius of th e media to eliminate the possibility of destroying or degrading data by landing in the data zone. The drive automatically goe s to the lan din g
zone when power is removed.
An automatic shipping lock prevents potential damage to the heads and discs that results from movement during shipping and ha ndl ing . T he shi ppi ng lock au toma tic al ly di se nga ges whe n power is applied to the drive and
the head load process begins.
Barracuda 180 drives decode track 0 location data from the servo data embedded on each surface to eliminate
mechanical transducer adjustments and related reliability concerns.
A high-performance actuator assembly with a low-inertia, balanced, patented, straight-ar m design provides
excellent performance with minimal power dissipation.
6 Barracuda 180 Product Manual, Rev. A
Figure 2. Barracuda 180 family drive
Barracuda 180 Product Manual, Rev. A 7
3.1 Standard features
The Barracuda 180 family has the following standard features:
• Integrated Ultra160 SCSI controller
• Multimode SCSI drivers and receivers—single-ended (SE) and low voltage differential (LVD)
• 16 bit I/O data bus
• Asynchronous and synchronous data transfer protocol (supports Ultra160 transfer rate)
• Firmware downloadable via SCSI interface
• Selectable even byte sector sizes from 512 to 4,096 bytes/sector
• Programmable sector reallocation scheme
• Flawed sector reallocation at format time
• Programmable auto write and read reallocation
• Reallocation of defects on command (post format)
• Enhanced ECC (maximum burst corrections length of 240 bits with a guaranteed burst correction of 233 bits)
• Sealed head and disc assembly
• No preventative maintenance or adjustment required
• Dedicated head landing zone
• Embedded servo design
• Self diagnostics performed when power is applied to the drive
• Zoned bit recording (ZBR)
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• 4,096 kbyte data buffer (16,384 kbytes on LWV and LCV models)
• Hot plug compatibility for LC and LCV model drives (Section 9.6.4.2 lists proper host connector needed)
• Supports SCSI bus fairness
3.2 Media characteristics
The media used on the dr ive has a di ameter of a pproximately 3 .3 in ches (8 4 mm). The alumi num substrat e is
coated with a thin film magneti c mat eria l, overcoated with a propr iet ar y prote ctive layer for improved durability
and environmental protection.
3.3 Performance
• Supports industry standard Ultra160 SCSI interface
• Programmable multi-segmentable cache buffer (see Section 3.1)
• 7,200 RPM spindle. Average latency = 4.17 ms
• Command queuing of up to 64 commands
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
3.4 Reliability
• 1,200,000 hour MTBF
• LSI circuitry
• Balanced low mass rotary voice coil actuator
• Incorporates industry-standard Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.)
• Incorporates Drive Self Test (DST) technology
• 5-year warranty
8 Barracuda 180 Product Manual, Rev. A
3.5 Unformatted and formatted capacities
Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per
sector. The following table shows the standard OEM model capacities:
Formatted
data block size
512 bytes/sector [1] Unformatted
ST1181677 1522c441h (181.6 GB) [2] 241.9 GB
Notes.
[1] Sector size se lectable at format time. Users having the necessar y equipmen t may modify the data block
size before issuing a format co mmand and obtain different formatted capa cities than those listed. See
Mode Select Command and Format Command in the SCSI Interface Product Manual.
[2] User available capacit y depends on spare r eallocation schem e selected, the number o f data tracks per
sparing zone, and the number of alternate sectors (LBAs) per sparing zone.
3.6 Programmable drive capacity
Using the Mode Sele ct com mand, you can c hange the d r ive’s capacity to something les s than m aximum. Se e
the SCSI Interface Product Manual. Refer to the Parameter list block descriptor number of blocks field. A value
of zero in the number of blocks field indicates that the drive will not change the capacity it is currently formatted
to have. A number in the number of blocks field that is less than the maximum number of LBAs changes the
total drive capacity to the value in the block descriptor numb er of blocks field. A value greater than the m aximum number of LBAs is rounded down to the maximum capacity.
3.7 Factory installed accessories
OEM standard dr ives are ship ped with the Bar racuda 180 In stall ation Gui de, par t numb er 100 109942 and th e
Safety and Regulator y Agency Specifications, part number 75 789512 (unless otherwise specified ). A small
bag of jumper plugs used for the J2, J5, and J6 option select jumper headers are also included with the drive.
3.8 Options (factory instal led)
All customer request ed options are incorporate d during production or packaged at the manufacturin g facility
before shipping. Some of the options available are (not an exhaustive list of possible options):
• Other capacities can be ordered depending on sparing scheme and sector size requested.
• Single unit shipping pack. The drive is norm ally shipped in bulk pa ckaging to provide maximum protec tion
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 Bar racuda 180 Installation Guide, par t number 100109942. This guide i s usually included with each
standard OEM drive shipped, but you may order extra copies.
• The Safety and Regulatory Agency Specif ications, part number 757895 12, is usually included with each
standard OEM drive shipped, but you may order extra copies.
3.9 Accessories (user installed)
The following accessories are available. All accessories may be installed in the field.
• Single unit shipping pack.
Barracuda 180 Product Manual, Rev. A 9
4.0 Performance characteristics
4.1 Internal drive characteristics (transparent to user)
ST1181677
Drive capacity 181.6 GBytes (formatted, rounded off values)
Read/write heads 24
Bytes/track 406,071 Bytes (average, rounded off values)
Bytes/surface 19,263 Mbytes (unformatted, rounded off values)
Tracks/surface (total) 24,247 Tracks (user accessible)
Tracks/inch 31,200 TPI
Peak bits/inch 490 KBPI
Internal data rate 282-508 Mbits/sec (variable with zone)
Disc rotational speed 7,200 r/min (+
Average rotational latency 4.17 msec
4.2 SCSI performance characteristics (visible to user)
The values given in Section 4.2.1 apply to al l models of the Bar racuda 180 family unless otherwi se specified .
Refer to Section 9.10 and to the SCSI Interface Product Manual for additional timing details.
4.2.1 Access time [5]
Including controller overhead
(without disconnect) [1] [3]
Drive level Drive level
Read Write Read Write
msec msec
Average—Typical [2] 7.6 8.4 7.4 8.2
Single Track—Typical [2] 1.0 1.3 0.8 1.1
Full Stroke—Typical [2] 16.2 17.2 16.0 17.0
0.5%)
Not Including controller overhead
(without disconnect) [1] [3]
4.2.2 Format command execution time (minutes) [1]
ST1181677
Maximum (with verify) 210
Maximum (no verify) 120
4.2.3 Generalized performance characteristics
Minimum sector interleave 1 to 1
Data buffer transfer rate to/from disc media (one 512-byte sector):
Minimum [3]* 25.3 MByte/sec
Average [3] 36.1 MByte/sec
Maximum [3] 47.0 MByte/sec
SCSI interface data transfer rate (asynchronous):
Maximum instantaneous one byte wide 5.0 Mbytes/sec [4]
Maximum instantaneous two bytes wide 10.0 Mbytes/sec [4]
Synchronous formatted transfer rate
Ultra2 SCSI Ultra160 SCSI
In low voltage differential (LVD) interface mode 5.0 to 80 Mbytes/sec 5.0 to 160 Mbytes/sec
10 Barracuda 180 Product Manual, Rev. A
Sector Sizes:
Default 512 byte user data blocks
Variable 512 to 4,096 bytes per sector in even number of bytes per sector.
If n (number of bytes per sector) is odd, then n-1 will be used.
Read/write consecutive sectors on a track Yes
Flaw reallocation performance impact (for flaws reallocated at format time using
the spare sectors per sparing zone reallocation scheme.)
Average rotational latency 4.17 msec
Notes for Section 4.2.
[1] Execution time measured fr om receipt of the last byte of the Command Descriptor Blo ck (CDB) to the
request for a Status Byte Tr ansfer to the Initiator (excluding connect/disconnect).
[2] Typical access times are measur ed under nominal c ondition s of temperat ure, voltage, and hor izontal or i-
entation as measured on a representative sample of drives.
[3] Assumes no errors and no sector has been relocated.
[4] Assumes system ability to support the rates listed and no cable loss.
[5] Access time = controller overhead + average seek time.
Access to data = controller overhead + average seek time + latency time.
4.3 Start/stop time
After DC power at no minal voltage h as been appl ied, the d r ive becom es rea dy withi n 30 sec onds if the Mo tor
Start Opti on is disabled (i.e. the motor star ts as soon as the power has bee n applied). If a recoverable error
condition is detected during the start sequence, the drive executes a recovery procedure which may cause the
time to become rea dy to exceed 30 seconds. Dur ing spin up to ready time the dr ive responds to s ome commands over the SCSI interface in less than 1.5 seconds afte r application of power. Stop time is less than 30
seconds from removal of DC power.
If the Motor Star t Option is en abled, the inter nal cont roller accep ts the comm ands list ed in the SCSI In terface
Product Manual less tha n 1.5 s econds after DC power has bee n appl ied. Afte r the Motor Start Command has
been received the d rive becomes ready for nor mal opera tions withi n 30 seco nds typical ly (excluding an error
recovery procedure). The Mo tor Start Comm and can also be used to comm and the drive to stop the spindle
(see SCSI Interface Product Manual).
Negligible
There is no power control switch on the drive.
4.4 Prefetch/multi-segmented cache control
The drive provides prefetch (read look-ahead) and multi-segmented cache control algorithms that in many
cases can enhanc e system perfor manc e. “The term “cache” refers to the drive buffer storage space when it is
used in cache operations. To select prefetch and cache features, the host sends the Mode Select com mand
with the proper values in the applicable bytes in Mode Page 08h (see SCSI Interface Product Manual). Prefetch
and cache operations ar e independent features from the sta ndpoint that each is ena bled and disabled independently using the Mode Select command. However, in actual operation, the pr efetch feature overlaps ca ch e
operation somewhat as is noted in Section 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 provided in Table 7.
4.5 Cache operation
In general, 3,600 kbytes (14,399 kbytes of the 16, 384 kbytes on LWV and LCV models) of the 4,096 kbytes of
physical buffer space in the drive can be used as storage space for cache operations. The buffer can be divided
into logical segm ents (Mode Sele ct Page 08h, byte 13) from whic h data is read and to which da ta is written .
The drive supports a maximum of 64 cache segments and maintains a table of logical block disk medium
addresses of the data stored in each segment of the buffer. If cache operation is enabled (RCD bit = 0 in Mode
Page 08h, byte 2, bit 0. See SCSI Interface Product Manual ), data requested by the host with a Read command is retrieved from the buffer (if it is there) before any disc access is initia ted. If cache operation is not
Barracuda 180 Product Manual, Rev. A 11
enabled, the buffer (still segmented with required numb er of segments ) is still use d, but only as circula r buffer
segments during d isc medium read op erations (disregard ing Prefetch operation for the moment) . That is, the
drive does not check in the buffer segments for the requested read data, but goes di rectly 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 cache
miss, all data transfers to the host are in accordance with buffer-full ratio rules. On a cache hit, the drive ignores
the buffer-full ratio rules. See explanations as sociated with Mode p age 02h (disconne ct/reconnect contr ol) in
the SCSI Interface Product Manual.
The following is a simplified description of a read operation with cache operation enabled:
Case A -
1. Drive transfers to the initiator the first LB reque ste d plus all subsequent contiguous LBs that are alr ea dy in
2. When the requested LB is reached that is not in any cache segment, the drive fetches it and any remaining
3. If the prefetch feature is enabled, refer to Section 4.5.2 for operation from this point.
Case B -
1. The drive fetches the requested LBs from the disc and transfers them into a segment, and from there to the
2. If the prefetch feature is enabled, refer to Section 4.5.2 for operation from this point.
Each buffer segment is a self-contain ed circular storage area (wrap-around oc curs), the leng th of which is an
integer number of disc medium sectors. The wrap-around capability of the individual segments greatly
enhances the buffer’s overall performance as cac he s torage, a llowing a wi de range of u se r se lec table co nfi gurations, including their u se in the prefetch operation (if enabled) even when cache operation is dis abled (see
Section 4.5.2). The number of segments is set dynamically by the drive and cannot be set by the host. The size
in kbytes of each segment is not reported by the Mode Sense command page 08h, bytes 14 and 15. The value
0XFFFF is always reported. If a size specification is sent by the host in a Mode Select command (bytes 14 and
15) no new segment size is set up by the drive, and if the STRICT bit in Mode pa ge 00 h (byte 2, bit 1) is se t to
one, the drive responds as it does for any attempt to change unc hangeable parameters (see SCSI Interface
Product Manual). The dr ive supports operation of any integer numbe r of se gme nts from 1 to 6 4. The default is
three segments.
A Read command is received and the first logical block (LB) is already in cache:
the cache. This data may be in multiple segments.
requested LBs from the disc an d puts them in a s egment of the cache. The dr ive transfers the remainin g
requested LBs from the ca che to t he host in accorda nce with the disconn ect/r econn ect speci fication mentioned above.
A Read command requests data, the first LB of which is not in any segment of the cache:
host in accordance with the disconnect/reconnect specification referred to in case A.
4.5.1 Caching write data
Write caching is a wr ite operation that uses the drive buffer storage area where the data to be writte n to the
medium is stored in one or more segments while the drive performs the write command.
If read caching is enabled (RCD=0), data written to th e medium is retained in the cache for future read cache
hits. The same buffer space and segmentation is used as set up for read functions. The buffer segmentation
scheme is set up or changed independe ntly, having nothing to do with the state o f the RCD bi t. When a write
command is issued, if RCD=0, the cache is first ch ecked to see if any logical blocks that are to be written are
already stored in the cac he 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 wri te data lo gical blocks exceeds t he size of the segment b eing w ritten i nto, 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), 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 th e medium. If an error occurs while
writing the data to the medium, and GOOD status has already been returned, a deferred error will occur.
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.
12 Barracuda 180 Product Manual, Rev. A
Tables 7 show Mode default settings for the drives.
4.5.2 Prefetch operation
If the Prefetch feature is enabled, data in conti guous lo gical blocks on the disc i mmedia tely b eyond that which
was requested by a Read comman d can be retri eved and stored in the buffer for immediate transfer from the
buffer to the host on subsequent Read commands that request those logical blocks (this is true even if cache
operation is disabled). Though th e prefetch operation us es the buffer as a cache, findin g the r equ es ted data i n
the buffer is a prefetch hit, not a cache operation hit. Prefetch is enabled using Mode Select page 08h, byte 12,
bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch. Since data that is prefetched replaces data
already in some buffer segment(s), the host can limit the am ount of prefetch data to optimize s ystem 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 dri ve crosses a cyl inder bounda r y to fetch more data o nly if the Discontinuity
(DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h.
Whenever prefetch (read look-ahead) is enabled ( enabled by DRA = 0), it opera tes und er the co ntrol 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 dis ables pre fetch, but as long as s equ enti al read oper ations request contiguous blocks of data, ARLA keeps prefetch enabled.
Barracuda 180 Product Manual, Rev. A 13
5.0 Reliability specifications
The following reliability spe cifications assume correct hos t/drive operational interface, including all interface
timings, power supply voltages, environmental requirements and drive mounting constraints (see Section 8.4).
Seek Errors
Less than 10 in 10
Read Error Rates [1]
Recovered Data Less than 10 errors in 10
Unrecovered Data Less than 1 sector in 10
Miscorrected Data Less than 1 sector in 10
MTBF 1,200,000 hours
Service Life 5 years
Preventive Maintenance None required
Note.
[1] Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.
5.1 Error rates
The error rates stated in this specification assume the following:
• The drive is operated per this specification using DC power as defined in this manual (see Section 6.2).
• The drive has been formatted with the SCSI Format command.
• Errors caused by media d efects or hos t system failures are exclude d from er ror rate comp utat ions. Refer to
Section 3.2, “Media Characteristics.”
• Random data is used.
8
seeks
12
bits transferred (OEM default settings)
15
bits transferred (OEM default settings)
21
bits transferred
5.1.1 Environmental interference
When evaluating system operation under conditions of Electromagnetic Interference (EMI), the performance of
the drive within the system is considered acceptable if the drive does not generate an unrecoverable condition.
An unrecoverable error, or unrecoverable condition, is defined as one that:
• Is not detected and corrected by the drive itself;
• Is not capable of being detected from the error or fault status provided through the drive or SCSI interface; or
• Is not capable of being recovered by normal dr ive or sys tem rec overy pro cedur es wit hou t opera tor inte rven-
tion.
5.1.2 Read errors
Before determination or measurement of read error rates:
• The data to be used for measurement of rea d error rates must be ver ified as being wr itten correc tly on the
media.
• All media defect induced errors must be excluded from error rate calculations.
5.1.3 Write errors
Write errors can occur as a result of media defects, environmental interference, or equipment malfunction.
Therefore, write errors are not predictable as a function of the number of bits passed.
If an unrecoverable write error occurs 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 those which cannot be corrected within two
attempts at writing the record with a read verify after each attempt (excluding media defects).
5.1.4 Seek errors
A seek error is de fin ed as a failure o f t he drive to position the heads to t he add re ss ed track. Th ere sh all b e no
more than ten recoverable seek errors in 10
8
physical seek operations. After detecting an init ia l se ek err or, the
drive automatically per forms an error recover y process. If the error r ecovery process fails, a seek posi tioning
error (15h) is repor ted wit h a Medium err or (3h) or Har dware error (4h) repo rt ed in the Sense Key. This is an
14 Barracuda 180 Product Manual, Rev. A
unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculatio ns. Refer to
the SCSI Interface Product Manual for Request Sense information.
5.2 Reliability and service
You can enhance the reliability of Barracuda 180 disc drives by ensuring that the drive receives adequate cooling. Section 6.0 pr ovides temperature meas urements and other information that you can use to enhanc e the
service life of the drive. Section 8.3 provides recommended air-flow information.
5.2.1 Mean time between failure
The production disc drive 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 th e
specification limits of the operating environment will not affect MTBF performance. Continual or sustained
operation at case temperatures above the values specified in Section 6.4.1 may degrade product reliability.
The MTBF target is specified as device power-on hours (POH) for all drives in service per failure.
MTBF per measurement period =
Estimated power-on operating hours in the per i od
__
Number of drive failures in the period
Estimated power-on operation hours means power-up hours per disc drive times the total number of disc drives
in 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.
• Operations at nominal voltages.
• Systems will provide adequate cooling to ensure the case temperatures specified in Section 6.4.1 are not
exceeded.
Drive failure means any stoppage or substandard performance caused by drive malfunction.
A S.M.A.R.T. predictive failure indicates that the dr ive is dete riora ting to an imm inent failure and is consi dere d
an MTBF hit.
5.2.2 Field failure rate vs. time
The expected field failure rate is listed below. Drive utilization will vary. An estimated range of utilization is:
• 720 power-on hours (POH) per month.
• 250 on/off cycles per year.
• Read/seek/write operation 90% of power-on hours.
• Systems will provide adequate cooling to ensure the case temperatures specified in Section 6.4.1 are not
exceeded.
Month 1 2,500 PPM
Month 2 1,600 PPM
Month 3 1,200 PPM
Month 4 1,000 PPM
Month 5 890 PPM
Month 6 840 PPM
Month 7 805 PPM
Failure rate is calculated as follows:
• No system-induced failures are counted
• Based on 1,200,000 MTBF and 720 power-on hours per month
• Month 1’s rate includes a 300 PPM installation failure
Barracuda 180 Product Manual, Rev. A 15
5.2.3 Preventive maintenance
No preventive maintenance is required.
5.2.4 Service life
The useful ser v ic e life of the dr i ve is five years. Depot repa ir or re pla ce men t of major part s i s permitted during
the lifetime (see Section 5.2.5).
5.2.5 Service philosophy
Special equipmen t is requir ed to repair the drive HDA. In order to achi eve the above service life, repairs must
be performed only at a proper ly equip ped and staffed ser vice and repair facility. Troubleshooting and repa ir of
PCBs in the field i s not recommended, be cause of the extensive diagnostic eq uipment required for effective
servicing. Also, there are no spare parts available for this drive. Drive warranty is voided if the HDA is opened.
5.2.6 Service tools
No special tools are requi red for site instal lat ion or recomm ended for site maintenance. Refer to Section 5.2.5.
The depot repair philosophy of the drive precludes the necessity for special tools. Field repair of the drive is not
practical since there are no user purchasable parts in the drive.
5.2.7 Hot plugging Barracuda 180 disc drives
The ANSI SPI-3 (T10 /1302D) documen t defines the physical requi rements for removal and inser tion of SCS I
devices on the SCSI bus. Four cases are addressed. The cases are differentiated by the state of the SCSI bus
when the removal or insertion occurs.
Case 1 - All bus devices powered off during removal or insertion
Case 2 - RST signal asserted continuously during removal or insertion
Case 3 - Current I/O processes not allowed during insertion or removal
Case 4 - Current I/O process allowed during insertion or removal, except on the device being changed
Seagate Barracuda 18 0 disc dr ives support all four hot plugg ing cas es. Provisio n sho uld be made by the sy stem such that a device being inser ted makes power and ground connections prior to the connection of any
device signal contact to the bus. A device being removed should maintain power and ground connections after
the disconnection of any device signal contact from the bus (see SFF-8046, SCA-2 specification).
It is the responsibility of the systems integrator to assure that no hazards from temperature, energy, voltage, or
ESD potential are presented during the hot connect/disconnect operation.
All I/O processes for the SCS I d evice being i ns erted or removed should be qui es c ent. Al l S CSI devices on the
bus should have receivers that conform to the SPI-3 standard.
If the device being hot plugged uses single-ended (SE) drivers and the bus is currently operating in low voltage
differential (LVD) mode, then all I/O processes for all devices on the bus must be completed , and the bus quiesced before attempting to hot plug the drive. Following the insertion o f the newly installed device, the SCSI
host adapter must issue a Bus Reset, followed by a synchronous transfer negot iation. Failure to perform the
SCSI Bus Reset could result in erroneous bus operations.
The SCSI bus termination and termination power source must be external to the device being inser ted or
removed.
End users should not mix devices with high voltage differential (H VD) drivers and receivers and devices wit h
SE, LVD, or multimode drivers and receivers on the s ame SCSI bus since the commo n mode voltages in the
HVD environment may not be controlled to safe levels for SE and LVD devices (see ANSI SPI-3).
The disc drive spindle must co me to a complete st op prior to comple tely removing the dr ive from the cabinet
chassis. Use of the Stop Spin dle co mmand o r partial withdrawal of the dr ive, enough to be dis conn ected f rom
the power source, prior to removal are methods for insuring that this requirement is met. During drive insertion,
care should be taken to avoid exceeding the limits stated in Section 6.4.4, “Shock and vibration” in this manual.
16 Barracuda 180 Product Manual, Rev. A
5.2.8 S.M.A.R.T.
S.M.A.R.T. is an acronym for Self-Monitori ng Analys is and Rep or ting Technology. This technology is intended
to recognize conditions that indi cate a dri ve failure and is designed to provide suff icient war ning of a failure to
allow data back-up before an actual failure occurs.
Note.
The firmware will monitor specific attributes for degradation over time but cannot predict instantaneous
drive failures.
Each attribute ha s bee n s el ec ted to mo nit or a sp ec ifi c s et of failure c ond itio n s in the operating performance o f
the drive, and the thresholds are optimized to minimize “false” and “failed” predictions.
Controlling S.M.A.R.T.
The operating mode of S.M.A.R.T. is controlled by the DEXCPT bit and the PERF bi t of the “Informational
Exceptions Control Mode Page” (1Ch). Th e DEXCPT bit is us ed to enable or disable the S.M.A.R.T. process.
Setting the DEXCPT bit will disable all S.M.A.R.T. functions. When enabled, S.M.A.R.T. will collect on-line data
as the drive performs nor m al re ad/wr ite operatio ns. When t he PER F bit is set, th e dr ive is consi dered to be in
“On-line Mode Only” and will not perform off-line functions.
The process of measuring off-line attributes and saving data can be forced by the Rezero Unit command. Forcing S.M.A.R.T. will reset the timer so that the next scheduled interrupt will be two hours.
The drive can be interrogated by the host to determine the time remaining before the next scheduled measurement and data loggi ng process will oc cur. This is accomplished by a log sense command to log page 0x3E .
The purpose is to allow the customer to control when S.M.A.R.T. interruptions occur. As described above, forcing S.M.A.R.T by the Rezero Unit command will reset the timer.
Performance impact
S.M.A.R.T. attribute data will be saved to the disc for the purpose of recreating the events that caused a predictive failure. The drive will measure and save parameters once every two hours subject to an idle per iod on the
SCSI bus. The process of m easuring off-line attr ibute data and saving data to th e disc is u ninterrup table and
the maximum delay is summarized below:
Maximum processing delay
On-line only delay Fully enabled delay
DEXCPT = 0, PERF = 1 DEXCPT = 0, PERF = 0
S.M.A.R.T. delay times 50 milliseconds 300 milliseconds
Reporting control
Reporting i s controlled in the Informational Excep tions Control Page (1Ch). Subj ect to the repor ting method,
the firmware will is su e a 01- 5D0 0 s ense c od e to the hos t. T h e err or c ode is pr eserved through bus resets and
power cycles.
Determining rate
S.M.A.R.T. monitors the rate at which errors occur and s ignals a pred ictive failure if the rate of degraded er ror
rate increases to an una cc ept able level. To determine rate, error events are logged and compared to the number of total operations for a given attr ibute. The inter val defines the number of operations over which to m easure the rate. The counter that keeps track of the c urrent number of operations is referred to as the I nterval
Counter.
S.M.A.R.T. measures error rate, hence for each attr ibute the occurrence of an error is recorded. A counter
keeps track of the number of errors for the current interval. This counter is referred to as the Failure Counter.
Error rate is simply the number of errors per ope ration. The algorithm that S.M.A.R.T. uses to record rates of
error is to set thresholds for the number of errors and the interval. If the number of errors exceeds the threshold
before the interval expires, then the error rate is cons idered to be u nacceptable. If the numbe r of errors d oes
not exceed the threshold before the interval expires, then the error rate is considered to be acceptable. In either
case, the interval and failure counters are reset and the process starts over.
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