1999 Seagate Technology, Inc. All rights reserved
Publication Number: SG35116-001, Rev. D, June 1999
Seagate, Seagate Technology, the Seagate logo and U4 are either
trademarks or registered trademarks of Seagate Technology, Inc. Other
product names are registered trademarks or trademarks of their owners.
Seagate reserves the right to change, without notice, product offerings
or specifications. No part of this publication may be reproduced in any
form without written permission fro m Seagate Technology, Inc.
Seagate Connfidential Review Draft - NOT FOR DISTRIBUTION
viU4 Family Product Manual, Rev. D.
Seagate Confidential Review Draft - NOT FOR DISTRIBUTION
U4 Family Product Manual, Rev. D1
Introduction
This manual describes the functional, mechanical and interface specifications for the U4
ST32112A. These drives provide the following key features:
•
Low power consumption
•
Quiet operation
•
10-5 msec seek time, 5-400 -RPM and 256 -Kbyte buffer for excel lent
desktop performance
•
High instantaneous (burst) data-transfer rates (up to 66.6 Mbytes per
second) using Ultra DMA mode 4
•
300 Gs nonoperating shock
•
Full-track multiple-sector transfer capability without local processor
intervention
•
State-of-the-art cache and on-the-fly error-correction algorithms
•
MR recording heads and EPRML technology, which provide the drives
with increased areal density
•
Support for S.M.A.R.T. drive monitoring and reporting
•
Support for Read Multiple and Write Multiple commands
ST38421A, ST36421A, ST34311A and the
•
Support for autodetection of master/slave drives that use cable select
(CSEL)
2U4 Family Product Manual, Rev. D
Specification summary table
The specifications listed in this table are for quick reference. For details
on specification measurement or definition, see the appropriate section
of this manual.
Drive Specification
Guaranteed Mbytes
(×106 bytes)
Guaranteed sectors4,225,5368,452,08012,596,850 16,498,944
Bytes per sector512
Default sectors per track63
Default read/write heads16151516
Default cylinders 4,1928,944 13,33016,368
Physical read /write
Ambient temperature 0° to 55°C (op.), –40° to 70°C (nonop.)
Temperature gradient
(°C per hour max)20°C
Relative humidity
(op. and nonop.)
Relative humidity
gradient30% per hour max
Wet bulb temperature
(°C max)29.4 (op.), 40.0 (nonop.)
Altitude, operating–61 m to 3,048 m (–200 ft to 10,000
Altitude, nonoperating–122 m to 12,192 m (–400 ft to 40,000
Shock (Gs at 2 msec)
operating
nonoperating
Vibration, operating0.5 Gs (0 to peak, 5–350 Hz)
5% to 90% (op.)
5% to 95% (nonop.)
+
+
63 Gs
300 Gs
ft)
ft)
4U4 Family Product Manual, Rev. D
Drive Specification
ST32112AST34311AST36421AST38421A
Vibration, nonoperating5 Gs (0 to peak, 5–350 Hz)
Drive acoustics
Sound power
Idle mode
Seek mode
Nonrecoverable read
errors1 per 10
3.3 (typical), 3.7(max)
3.9 (typical), 4.3 (max)
13
bits read
Mean time between
failures (po wer-on hours)400,000
Contact start-stop cycles
(25°C, 40% relative
50,000
humidity)
Service life (years)5
U4 Family Product Manual, Rev. D5
1.0 Drive specifications
Unless otherwise noted, all specifications are measured under ambient
conditions, at 25 °C, and no min al power. For convenie nce, the phrases