Seagate ST9655 Series User manual

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ST9655 Family
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ST9655AG, ST9550AG
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ST9385AG
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ATA Interface Drives
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Product Manual
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ST9655 Family
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ST9655AG, ST9550AG
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ST9385AG
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ATA Interface Drives
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Product Manual
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1994 Seagate Technology,Inc. All rights reserved
Publication Number: 36270-001, Rev. A
September 1994
Seagate®, Seagate Technology®and the Seagate logo are registered
trademarks of Seagate Technology, Inc. Other product names are reg-
istered 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 from Seagate Technology, Inc.

Contents
1.0 Drive specifications . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Formatted capacity . . . . . . . . . . . . . . . . . . . . . 1
1.2 Physical organization . . . . . . . . . . . . . . . . . . . . 1
1.3 Logical organization . . . . . . . . . . . . . . . . . . . . . 1
1.4 Default logical geometry . . . . . . . . . . . . . . . . . . . 1
1.5 Recording and interface technology . . . . . . . . . . . . . 2
1.6 Physical dimensions . . . . . . . . . . . . . . . . . . . . . 2
1.7 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.8 Start times . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.9 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.10 Drive acoustics . . . . . . . . . . . . . . . . . . . . . . . 4
1.11 Environment . . . . . . . . . . . . . . . . . . . . . . . . 4
1.11.1 Ambient temperature . . . . . . . . . . . . . . . . . 4
1.11.2 Temperature gradient . . . . . . . . . . . . . . . . . 4
1.11.3 Relative humidity . . . . . . . . . . . . . . . . . . . 4
1.11.4 Altitude . . . . . . . . . . . . . . . . . . . . . . . . 4
1.11.5 Shock . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.11.6 Vibration . . . . . . . . . . . . . . . . . . . . . . . . 5
1.12 Power specifications . . . . . . . . . . . . . . . . . . . . 6
1.12.1 Power management . . . . . . . . . . . . . . . . . . 6
1.12.2 Power consumption . . . . . . . . . . . . . . . . . . 8
1.12.3 Conducted noise . . . . . . . . . . . . . . . . . . . 10
1.12.4 Voltage tolerance . . . . . . . . . . . . . . . . . . . 10
1.13 Agency certification . . . . . . . . . . . . . . . . . . . . 10
1.13.1 UL/CSA listing . . . . . . . . . . . . . . . . . . . . . 10
1.13.2 FCC verification . . . . . . . . . . . . . . . . . . . . 10
1.14 Compatibility notes . . . . . . . . . . . . . . . . . . . . . 11
1.14.1 ECC testing . . . . . . . . . . . . . . . . . . . . . . 11
ST9655 Family Product Manual, Rev. A iii

2.0 Drive mounting and configuration . . . . . . . . . . . . . . 13
2.1 Handling and static-discharge precautions . . . . . . . . . 13
2.2 Mounting the ST9655 family drives . . . . . . . . . . . . . 13
2.3 Master/slave configuration . . . . . . . . . . . . . . . . . . 15
2.4 Configuring a remote LED . . . . . . . . . . . . . . . . . . 15
3.0 ATA interface . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1 ATA interface connector . . . . . . . . . . . . . . . . . . . 17
3.2 ATA interface signals and connector pins . . . . . . . . . . 18
3.2.1 AT bus signal levels . . . . . . . . . . . . . . . . . . 19
3.3 ATA interface commands . . . . . . . . . . . . . . . . . . 20
3.3.1 Identify Drive command . . . . . . . . . . . . . . . . 22
3.3.2 Set Features command . . . . . . . . . . . . . . . . . 26
3.3.3 Rest/Resume commands . . . . . . . . . . . . . . . . 27
iv ST9655 Family Product Manual, Rev. A

Figures
Figure 1. Typical startup and operation current profile for the
ST9655AG . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 2. Typical startup and operation current profile for the
ST9550AG and ST9385AG . . . . . . . . . . . . . . . . 9
Figure 3. Mounting dimensions for the ST9655 family drives . . . . 14
Figure 4. Master/slave jumpers for the ST9655 family drives . . . . 16
Figure 5. ATA interface connector for the ST9655 family drives . . 17
ST9655 Family Product Manual, Rev. A v

1.0 Drive specifications
1.1 Formatted capacity
ST9655AG ST9550AG ST9385AG
Guaranteed Mbytes
(1 Mbyte = 106bytes) 524 455 341
Guaranteed sectors 1,024,128 889,248 666,876
Bytes per sector 512 512 512
1.2 Physical organization
ST9655AG ST9550AG ST9385AG
Read/Write heads 8 8 6
Discs 4 4 3
1.3 Logical organization
The ST9655 family drives support all head, cylinder andsector geome-
tries, subject to the maximums specified below, and to the following
condition:
(
sectors ) ×( heads ) × (cylinder s) ≤ total sectors per drive
ST9655AG ST9550AG ST9385AG
Sectors per track (max) 64 64 64
Read/Write heads (max) 16 16 16
Cylinders (max) 1,024 1,024 1,024
1.4 Default logical geometry
ST9655AG ST9550AG ST9385AG
Sectors per track 63 59 51
Read/Write heads 16 16 14
Cylinders 1,016 942 934
ST9655 Family Product Manual, Rev. A 1

1.5 Recording and interface technology
Specification ST9655AG ST9550AG ST9385AG
Interface ATA ATA ATA
Recording method RLL (1,7) RLL (1,7) RLL (1,7)
Recording density (BPI) 72,100 59,124 59,124
Flux density (FCI) 44,360 44,360 44,360
Track density (TPI) 3,227 3,282 3,282
Spindle speed (RPM ±0.5%) 3,980 3,980 3,980
Internal data transfer rate
(Mbits per sec max—ZBR) 28.26 27.28 27.28
I/O data transfer rate (Mbytes per sec max)
PIO Mode 3 with IORDY
Multiword DMA Mode 1 11.1 13.3 8.0 13.3 8.0 13.3
Interleave 1:1 1:1 1:1
Cache buffer (Kbytes) 120 120 120
1.6 Physical dimensions
Height (max) inches
(mm) 0.754 (19.15)
Width (max) inches
(mm) 2.760 (70.10)
Depth (max) inches*
(mm) 4.010 (101.85)
Weight (typical) ounces
(kg) 7.4 (0.21)
* Excludes I/O connector pins, whichmay extendup to 0.010 inches be-
yond the edge of the head/disc assembly.
1.7 Seek time
Allseektimesaremeasuredusinga25 MHz486 ATcomputer(orfaster)
witha8.3MHzI/Obus. Themeasurementsaretakenwithnominalpower
at sea level and 25°C ambient temperature. The specifications in the
following table are defined asfollows:
2 ST9655 Family Product Manual, Rev. A