Seagate ST3780A User manual

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
Medalist Family:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
ST3780A, ST31220A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
AT Interface Drives
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
Product Manual
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .
Medalist Family:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
ST3780A, ST31220A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
AT Interface Drives
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .
Product Manual
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .

© 1994 Seagate Technology, Inc. All rights reserved
Publication Number: 36260-001, Rev. A
June 1994
Seagate®, Seagate Technology®and the Seagate logo are registered
trademarks of Seagate Technology, Inc. Medalistis a trademark of
Seagate Technology,Inc. Other productnames aretrademarks or regis-
tered 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 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Formatted capacity . . . . . . . . . . . . . . . . . . . . . . . 1
1.1.1 ST3780A configurations . . . . . . . . . . . . . . . . . 2
1.1.2 ST31220Aconfigurations . . . . . . . . . . . . . . . . . 2
1.1.3 Physical organization . . . . . . . . . . . . . . . . . . . 2
1.2 Functional specifications . . . . . . . . . . . . . . . . . . . . 3
1.3 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.1 Multisegmented cache buffer . . . . . . . . . . . . . . . 4
1.4 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Typical power-up and power-down sequence . . . . . . . . . 5
1.5.1 Power-up sequence . . . . . . . . . . . . . . . . . . . . 5
1.5.2 Power-down sequence . . . . . . . . . . . . . . . . . . 5
1.5.3 Auto-park . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.6 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.7 Physicaldimensions . . . . . . . . . . . . . . . . . . . . . . 6
1.8 Environmental specifications . . . . . . . . . . . . . . . . . . 6
1.8.1 Ambient temperature . . . . . . . . . . . . . . . . . . . 6
1.8.2 Temperature gradient . . . . . . . . . . . . . . . . . . . 6
1.8.3 Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.8.4 Relative humidity . . . . . . . . . . . . . . . . . . . . . 7
1.9 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.10 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . 7
1.11 DC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.11.1 Input noise . . . . . . . . . . . . . . . . . . . . . . . . 8
1.11.2 Power management . . . . . . . . . . . . . . . . . . . 8
1.11.3 Idle and Standby modes . . . . . . . . . . . . . . . . . 9
1.11.4 Power-management modes . . . . . . . . . . . . . . . 9
1.11.5 Power consumption . . . . . . . . . . . . . . . . . . 10
1.12 Agency listings . . . . . . . . . . . . . . . . . . . . . . . 11
Medalist Family AT Product Manual, Rev. A iii

1.13 FCC verification . . . . . . . . . . . . . . . . . . . . . . 12
2.0 Configuring and mounting the drive . . . . . . . . . . . . . 15
2.1 Handling and static-discharge precautions . . . . . . . . . 15
2.2 I/O cable and connector . . . . . . . . . . . . . . . . . . 16
2.3 Remote LED connection . . . . . . . . . . . . . . . . . . 17
2.4 Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.4.1 Jumper sizes . . . . . . . . . . . . . . . . . . . . . . 17
2.4.2 Dual-drive emulation jumper block (J6) . . . . . . . . . 19
2.4.3 Master/slave configuration . . . . . . . . . . . . . . . 19
2.5 Cable select option . . . . . . . . . . . . . . . . . . . . . 20
2.6 Mounting the drive . . . . . . . . . . . . . . . . . . . . . . 21
3.0 AT interface . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1 Command set . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1.1 Identify Drive command (ECH) . . . . . . . . . . . . . 25
3.1.2 Set Features command (EFH) . . . . . . . . . . . . . 27
3.1.3 Sleep command (99H, E6H) . . . . . . . . . . . . . . 29
3.2 AT Interface connector pin assignments . . . . . . . . . . 29
Appendix. Timing diagrams . . . . . . . . . . . . . . . . . . . . . 31
iv Medalist Family AT Product Manual, Rev. A

Figures
Figure 1. Typical startup current profile . . . . . . . . . . . . . 11
Figure 2. AT interface connector . . . . . . . . . . . . . . . . . 16
Figure 3. Configuration jumpers . . . . . . . . . . . . . . . . . 18
Figure 4. Connecting cable-selected drives . . . . . . . . . . . 20
Figure 5. Mounting dimensions . . . . . . . . . . . . . . . . . . 22
Figure 6. AT interface connector pin assignments . . . . . . . 30
Figure 7. Programmed I/O timing without IORDY . . . . . . . . 31
Figure 8. Programmed I/O timing with IORDY . . . . . . . . . . 32
Figure 9. Multiword DMA timing . . . . . . . . . . . . . . . . . 33
Medalist Family AT Product Manual, Rev. A v

1.0 Specifications
1.1 Formatted capacity
The drive was low-level formatted at the factory. You cannot low-level
format it.
The drive was configured in translation mode at the factory. You can
verify the numberof cylinders,sectors per track and heads, and the total
number of sectors by using the Identify Drive (ECH) command. See
Section 3.1.1 for details about the Identify Drive command.
The amount of disc space that your computer can access depends on
the type of computer you have and the type of operating system or
third-partyinstallation softwarethatisused tohigh-levelformatST31220
family drives.
Your computer may support one of two addressing schemes to access
data on a hard disc—logical block addressing (LBA) or cylinder-head-
sector addressing (CHS). LBA allows you to access the full capacity of
your hard disc. CHS, which is used on older DOS systems, limits the
capacity of your harddisc to1,024cylinders (approximately 512Mbytes)
unless:
•You are using third-party installationsoftwarethat supportsmorethan
1,024 cylinders.
•You have configured your system to support dual-drive emulation (see
page 19).
•You have a host adapter (controller card) that supports more than
1,024 cylinders.
The relationship between sectors, heads and cylinders and the total
number of sectors per drive is shown in the following equation:
(sectors) ×(heads) ×(cylinders) < total sectors per drive
Medalist Family AT Product Manual, Rev. A 1

1.1.1 ST3780A configurations
CHS LBA
Cylinders 1,399 N/A
Heads 16 N/A
Sectors 63 N/A
Total sectors 1,410,192 1,410,864
Formatted capacity (Mbytes1) 722.02 722.36
1. One Mbyte equals one million bytes.
1.1.2 ST31220A configurations
CHS LBA
Cylinders 2,099 N/A
Heads 16 N/A
Sectors 63 N/A
Total sectors 2,115,792 2,116,296
Formatted capacity (Mbytes1) 1,083.2 1,083.5
1. One Mbyte equals one million bytes.
1.1.3 Physical organization
ST3780A ST31220A
Read/write heads 4 6
Discs 2 3
2 Medalist Family AT Product Manual, Rev. A