Seagate HAWK ST32151N User manual

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Hawk 2XL Disc Drive
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST32151N/W/WC, ST31051N/W/WC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST32155N/W/WC, ST31055N/W/WC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Manual, Volume 1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hawk 2XL Disc Drive
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST32151N/W/WC, ST31051N/W/WC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST32155N/W/WC; ST31055N/W/WC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Manual, Volume 1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com

© 1996 Seagate Technology, Inc. All rights reserved
April 1996
Publication number: 77767489, Rev. B
Seagate®, Seagate Technology®, and the Seagate logo are registered trademarks of Seagate
Technology, Inc. EliteTM, SeaFAXTM, SeaFONETM, SeaTDDTM, and SeaBOARDTM are trade-
marks of Seagate Technology, Inc. Other product names are registered trademarks or trade-
marks of their 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
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com

Revision status summary sheet
Product Manual 77767489 is Volume 1 of a two Volume document with the SCSI Interface information
in the Volume 2 SCSI Interface Product Manual, P/N 77738479.
If the SCSI Interface information is needed the Volume 2 Interface Manual should be ordered, P/N
77738479.
Revision Date Writer/Engineer Sheets Affected
A 5/2/96 D. Ashby 1-75
B Ashby and Kiene 9, 23 and 25
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Hawk 2XL Product Manual, Rev. B vii
Contents
1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.0 Applicable standards and reference documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.2 Electromagnetic susceptibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Electromagnetic Compliance for the European Union . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Factory installed accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.7 Options (factory installed). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.8 Accessories (user installed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Internal drive characteristics (transparent to user). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 SCSI Seek performance characteristics (visible to user) [6]*. . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.1 Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.2 Format command execution time (minutes) [1] . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2.3 Generalized performance characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.4 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.5.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.0 Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.1 Environmental interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.2 Read errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.3 Write errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.4 Seek errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Reliability and service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.1 Mean time between failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.2 Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.3 Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.4 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.5 Service tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.6 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1 AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2 DC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2.1 Conducted noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.2.3 Current profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.3 Power dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.4.3 Effective altitude (sea level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.4.5 Air cleanliness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
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viii Hawk 2XL Product Manual, Rev. B
6.4.6 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
7.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
7.1 Drive internal defects and errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
7.2 SCSI systems errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
8.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
8.1 Drive ID/option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
8.1.1 Notes for Figures 7a, 7b, 7c, 7d and 7e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
8.1.2 Function description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
8.2 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
8.3 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
8.3.1 Air flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
8.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
8.5 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
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 data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
9.3.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
9.6.3 SCSI Interface Cable requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
9.6.4 Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
9.7 Terminator requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
9.8 Terminator power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
9.9 Disc drive SCSI timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
10.0 Technical support service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
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Hawk 2XL Product Manual, Rev. B ix
List of Figures
Figure 1. Hawk 2XL family drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Figure 2. Hawk 2XL family drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Typical Hawk 2XL family drive +5 V and +12 V current profile . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 4. Locations of components (listed in Table 3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 5. Recommended mounting (Applicable to all Hawk 2XL family models) . . . . . . . . . . . . . . . . . 24
Figure 6a. Mounting configuration dimensions for model “N” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 6b. Mounting configuration dimensions for model “W”. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 6c. Mounting configuration dimensions for model “WC” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 7a. Hawk 2XL family drive ID select header for model “N”. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 7b. Hawk 2XL family drive ID select for models “W” and “WC” . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 7c. Hawk 2XL family drive ID select header J1-auxiliary for model “W” (J1-Aux. Pins 1A-12A) . 34
Figure 7d. Hawk 2XL family drive option select header for models “N” and “W”. . . . . . . . . . . . . . . . . . . 35
Figure 7e. Hawk 2XL family drive option select header for model “WC”. . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 8. Air flow (suggested) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 9a. Physical interface for “N” model drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 9b. Model “W” drive physical interface (68 pin J1 SCSI I/O connector). . . . . . . . . . . . . . . . . . . . 51
Figure 9c. Model “WC” drive physical interface (80 pin J1 SCSI I/O connector / DC power connector) 51
Figure 10. SCSI Daisy-chain interface cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 11a. Nonshielded 50 pin SCSI device connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Figure 11b. Nonshielded 68 pin SCSI device connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 11c. Nonshielded 80 pin SCSI connector, used on “WC” model . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 12. Single-ended transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
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Hawk 2XL Product Manual, Rev. B 1
1.0 Scope
This manual describes the Seagate Technology, Inc. Hawk 2XL family of disc drives. This high capacity, high
performance member of the Seagate 1-inch high 3.5-inch rigid disk family is a next generation product from the
Hawk 2LP (ST34230) disc drive. The Hawk 2XL features a new cost-optimized HDA, reduced cost SCSI code,
reduced header fields and the use of innovative technology in the embedded servo, R/W heads, read circuits
and SCSI controller. Section 5 lists performance information for this drive. The Hawk 2XL drive operates an
interface to the host defined by a subset of ANSI SCSI 2/SCSI 3 as described in Section 9 of this manual
(Vol.1) and the Seagate SCSI Interface manual 77738479 (Vol. 2).
The Hawk 2XL family consists of ST32151, ST31051, ST32155 and ST31055 products. Models offered are N,
W, and WC.
Table 1 lists the salient features that differentiate the different Hawk 2XL model numbers.
Table 1: Drive model number vs. differentiating features
Fast SCSI-3
ULTRA SCSI-3 [1]
From this point on in this Product Manual the reference to Hawk 2XL family models is referred to as “the drive”
(unless reference to individual models are necessary).
The drive printed circuit board is referred to as a PCB.
[1] ULTRA SCSI is Seagate’s name for the ANSI proposed “FAST-20” interface.
Model number # Heads I/O Ckts #I/O
connector I/O data bus bits Interface Data
transfer rate
(Mbytes/sec)
ST32151N 8 single-ended 50 8 10
ST32151W 8 single-ended 68 16 20
ST32151WC 8 single-ended 80 16 20
ST31051N 4 single-ended 50 8 10
ST31051W 4 single-ended 68 16 20
ST31051WC 4 single-ended 80 16 20
Model number # Heads I/O Ckts #I/O
connector I/O data bus bits Interface Data
transfer rate
(Mbytes/sec)
ST32155N 8 single-ended 50 8 20
ST32155W 8 single-ended 68 16 40
ST32155WC 8 single-ended 80 16 40
ST31055N 4 single-ended 50 8 20
ST31055W 4 single-ended 68 16 40
ST31055WC 4 single-ended 80 16 40
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2Hawk 2XL Product Manual, Rev. B
.
*Model “N” version with 50 pin SCSI I/O connector
Figure 1. Hawk 2XL family drive
*
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Hawk 2XL Product Manual, Rev. B 3
2.0 Applicable standards and reference documentation
The drive has been developed as a system peripheral to the highest standards of design and construction. The
drive depends upon its host equipment to provide adequate power and environment in order to achieve opti-
mum performance and compliance with applicable industry and governmental regulations. Special attention
must be given in the areas of safety, power distribution, shielding, audible noise control, and temperature reg-
ulation. In particular, the drive must be securely mounted in order to guarantee the specified performance char-
acteristics. Mounting by bottom holes must meet the requirements of Section 8.4.
2.1 Standards
The Hawk 2XL Family complies with Seagate standards as noted in the appropriate sections of this Manual
and the Seagate SCSI Interface Manual, P/N 77738479 (Vol. 2).
The Hawk 2XL Family is a UL Recognized component per UL 1950 and a CSA Certified component per CAN/
CSA-C22.2 No. 950-M89. It also meets the requirements of DIN VDE 0805/05.90 and EN60950: 1988 (IEC
950).
2.1.1 Electromagnetic compatibility
The drive, as delivered, is designed for system integration and installation into a suitable enclosure prior to
use. As such the drive is supplied as a subassembly and is not subject to Subpart J of Part 15 of the FCC
Rules and Regulations nor the Radio Interference Regulations of the Canadian Department of Communica-
tions. However, the unit has been tested using proper shielding and grounding and found to be compliant with
Class A limits of the FCC Rules and the Regulations of the Canadian Department of Communications.
The physical 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 Communication. 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 or to the host controller, but not
both.
2.1.2 Electromagnetic susceptibility
As a component assembly, the drive is not required to meet any susceptibility performance requirements. It is
the responsibility of those integrating the drive within their systems to perform those tests required and design
their system to ensure that equipment operating in the same system as the drive or external to the system
does not adversely affect the performance of the drive. See Section 5.1.1 and Table 2, DC power require-
ments.
2.2 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.
Seagate uses an independent laboratory to confirm compliance to the above directives. The drive was tested
in a representative system for typical applications. The selected system represents the most popular charac-
teristics for test platforms The system configurations include:
• 486, Pentium, and PowerPC Microprocessors
• 3.5-inch Floppy Disc Drive
• Keyboard
• Monitor/Display
Although the test system with this Seagate model complies to the directives, we cannot guarantee that all sys-
tems will comply. The computer manufacturer or system integrator shall conform EMC compliance and provide
CE Marking for their product.
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4Hawk 2XL Product Manual, Rev. B
2.3 Reference documents
Installation Guide Seagate P/N 77767490
SCSI Interface Manual Seagate P/N 77738479
ANSI Small Computer System Interface (SCSI): Document Number ANSI3.131-1986 (X3T9/84.40 Rev. 1B)
(X3T9.2/82-2 Rev. 17B), X3T9.2/86-109 Revision 10H (SCSI-2) and X3T9.2-184 Rev. 4 (SCSI-3).
ANSI - draft proposed: Document Number X3T10/1071D, SCSI-3 FAST-20 revision 6.
Package Test Specification Seagate P/N 30190-001 (under 100 lb.)
Package Test Specification Seagate P/N 30191-001 (over 100 lb.)
In case of conflict between this document and any referenced document, this document takes precedence.
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Hawk 2XL Product Manual, Rev. B 5
3.0 General description
The drives are a member of a family of low cost, high performance, highly reliable, random access storage
devices designed to meet the needs of the OEM marketplace.
The drive records and recovers data on 3.5 inch (89 mm) fixed discs.
The drive supports the Small Computer System Interface as described in the ANSI SCSI-2 and SCSI-3 Inter-
face Manuals to the extent described in this product Manual (Vol. 1), which defines the product performance
characteristics of the Hawk 2XL Family of drives, and the SCSI Interface Product Manual P/N 77738479
(Vol.2, Version 2) which describes the general interface characteristics of this and other families of Seagate
3.5-inch drives.
The drive interface supports multiple initiators, disconnect/reconnect, self-configuring host software and auto-
matic features that relieve the host from the necessity of knowing the physical characteristics of the targets
(logical block addressing is used).
TheHead/Disc Assembly (HDA) is environmentally sealed at the factory. Air recirculates within the Head/Disc
(HDA) through a nonreplaceable filter to maintain a contamination free head/disc environment.
Refer to Figure 2, an exploded view of the drive. NEVER disassemble the Head/Disc Assembly (HDA). This
exploded view is for information only. Do not attempt to service items in the sealed environmental enclosure
(heads, media, actuator, etc.) as this requires special facilities. The drive contains no parts replaceable by the
user. The drive warranty is voided if the HDA is opened.
The Hawk 2XL Family drives use a dedicated landing zone at the innermost radius of the media to eliminate
the possibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the
landing zone when the power is removed.
The Hawk 2XL Family drives incorporate an automatic shipping lock which prevents potential damage to the
heads and discs that result from movement during shipping and handling. The shipping lock is automatically
disengaged when power is applied to the drive and the head load process begins.
The Hawk 2XL Family drives decode track location from the servo data embedded on each surface to elimi-
nate mechanical transducer adjustments and related reliability concerns.
The Hawk 2XL Family drives use a high performance actuator assembly that consists of a low inertia, bal-
anced, patented, straight arm design that provides excellent performance with minimum power dissipation.
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6Hawk 2XL Product Manual, Rev. B
Figure 2. Hawk 2XL family drive
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Hawk 2XL Product Manual, Rev. B 7
3.1 Standard features
The Hawk 2XL Family has the following standard features:
• Integrated SCSI Controller with reduced complexity SCSI code
• Single-ended SCSI drivers and receivers
• Asynchronous and Synchronous data transfer protocol
• Firmware downloadable via SCSI interface
• Flawed sector reallocation at format time
• Programmable auto write and read reallocation
• Reallocation of defects on command (Post Format)
• 96 bit Reed-Solomon error correcting code
• Sealed Head/Disc Assembly
• No preventative maintenance or adjustment required
• Dedicated head landing zone
• Embedded servo data rather than a separate servo data surface
• Self diagnostics performed at power on
• 1:1 Interleave
• Zoned Bit Recording (ZBR)
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• Permanently mounted terminators on “N” and “W” models, enabled by installation of a jumper plug.
• 256 K byte data buffer (512K byte data buffer for “W” and “WC” models and all Ultra SCSI models)
• Hot Plug compatibility (Section 9.6.4.3 lists proper host connector needed)
• SCAM plug-n-play compliant [1]
• ULTRA SCSI (Models ST32155 and ST31055)
3.2 Media characteristics
The media used on the drive has a diameter of approximately 3.5 inches (89 mm). The aluminum substrate is
coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability
and environmental protection.
3.3 Performance
• Programmable multi-segmentable cache buffer
• 5411 RPM Spindle. Average latency = 5.54 msec
• Command Queuing of up to 64 commands
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
• Low audible noise for office environment
• Low power consumption
3.4 Reliability
• 800,000 hour MTBF
• Adaptive servo calibration for improved seek performance
• LSI circuitry
• Balanced low mass rotary voice coil actuator
• 5 year warranty for ST32151 and ST32155; 3 year warranty for ST31051 and ST31055
[1] Supports SCAM Level 1 at the moment. Will support Level 2 when all presently unresolved requirements
are fully defined. As a factory installed option SCAM can be turned off.
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8Hawk 2XL Product Manual, Rev. B
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 some typical 512 byte sector size [1] formatted capacities (rounded off).
The standard OEM model is as follows:
Notes.
[1] Sector size selectable when formatted at factory.
[2] All spare sectors are on one track.
[3] Spare cylinders are on the two inner tracks.
[4] Sparing equivalent to eight spare sector per cylinder (all spare sectors are on one track), two spare cylin-
ders/unit.[3]
[5] Sparing equivalent to five spare sectors per cylinder (all spare sectors are on one track), two spare cylin-
ders/unit.[3]
3.6 Factory installed accessories
OEM Standard drives are shipped with Installation Guide P/N 77767490 (unless otherwise specified). The fac-
tory also ships with the drive a small bag of the two jumper plug types used for the option select jumper head-
ers.
3.7 Options (factory installed)
All customer requested options are incorporated during production or packaged at the manufacturing facility
before shipping. Some of the options available are (not an exhaustive list of possible options):
• The capacities shown in Section 3.5. Other capacities can be ordered depending on sparing scheme and
sector size requested.
• Black plastic front panel. Other panel colors may be specially ordered. Panel has a green, rectangular LED
drive activity indicator lens. The indicator glows when the drive is selected.
• Single unit shipping pack. The drive is normally shipped in bulk packaging to provide maximum protection
against transit damage. Units shipped individually require additional protection as provided by the single unit
shipping pack. Users planning single unit distribution should specify this option.
• The Installation Guide (P/N 77767490) is usually included with each standard OEM drive shipped, but extra
copies may be ordered.
3.8 Accessories (user installed)
The following accessories are available. All accessories may be installed in the field.
• Front Panel Kit (with green rectangular LED lens).
• Single unit shipping pack.
• Adapter Accessory Frame Kit P/N 75790701. This kit adapts a 3.5 inch Model “N” and “W” drives to fit in a
5.25 inch drive mounting space. The frame does not work for “WC” model drives which plug directly into a
bulkhead or backplane connector.
ST32151 GB
ST32155 GB ST31051 GB
ST31055 GB
Spare Sector or Cylinders
Reserved for reallocation
No Spares 2.18 1.07
Five Spare Sectors per Cylinder [2] - 1.06
Ten Spare Sectors per Cylinder [2] 2.15 -
Formatted
Data Block Size
512 Byte/Sector
Unformatted
ST32151/ST32155 2.148 GB[4] 2.54 GB
ST31051/ST31055 1.060 GB[5] 1.26 GB
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Hawk 2XL Product Manual, Rev. B 9
4.0 Performance characteristics
4.1 Internal drive characteristics (transparent to user)
4.2 SCSI Seek performance characteristics (visible to user) [6]*
The values given in Section 4.2.1 apply to all models of the Hawk 2XL family unless otherwise specified. Refer
to Section 9.9 and to the SCSI-2 Interface Product Manual 77738479 for additional timing details.
4.2.1 Access time
*[] All notes for Sections 4.2 are listed at end of Section 4.2.3.
ST32151/ST32155 ST31051/ST31055
Drive Capacity 2.54 1.26 GByte (UNF) (Rounded off values)
Read/Write Heads 8
Bytes/Track 75,900 75,900 Bytes (Avg) (Rounded off values)
Bytes/Surface 318 315 Mbytes (UNF) (Rounded off values)
Tracks/Surface, Total 4176 4176 Tracks (user accessible)
Tracks/Inch 4800 4800 TPI
Servo Heads 0 0 (embedded servo)
Internal Data Rate 44 - 66 44 - 66 Mbits/sec (variable with zone)
Disc Rotational Speed 5411 ±0.5% 5411 ±0.5% r/min
Average Rotational Latency 5.54 5.54 ms
Including Controller Overhead
(without disconnect) [1] [4]
Drive Level
Read Write
ms
Average - Typical [3] 10.4 11.4
Max. [2] 11.9 13.4
Single Track - Typical [3] 2.7 2.9
Max. [2] 3.8 4.3
Full Stroke - Typical [3] 20.4 21.4
Max. [2] 23.9 24.9
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