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st21-22.txt
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1991-05-15
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ST21M, ST21R
-------------------------------------------------
ST22M, ST22R
-------------------------------------------------
ST412 Interface Controller
-------------------------------------------------
Installation Guide
=================================================
_______________________________________ Seagate
Copyright Notice
Seagate, Seagate Technology and the Seagate logo are registered
trademarks of Seagate Technology, Inc. INSTALLR is a trademark of
Seagate Technology.
(C)opyright 1990 Seagate Technology Inc.
920 Disc Drive, Scotts Valley, California 95066-4544, USA
Telephone: 408/438-6550
Publication Number: 36127-001, Rev. A
Seagate reserves the right to change, without notice, product
offerings or specifications. This publication, and all material
contained herein, are copyrighted with all rights reserved. No
part of this publication may be copied without written
permission of Seagate Technology, Inc.
PC AT and PC-DOS are registered trademarks of International
Business Machines Corporation. XT is a trademark of International
Business Machines Corporation.
DISK MANAGER and ONTRACK are registered trademarks of ONTRACK
Computer Systems, Inc.
1
Introduction
The ST21 and ST22 are 16-bit ST412 interface controllers designed
for use in AT-type systems.
* The ST21M and ST22M are designed for use with drives
employing MFM data encoding and a 5.0 Mbit/sec. I/O data transfer
rate. Seagate Technology, Inc. assumes no liability for
installation of an MFM controller with an RLL-certified drive.
* The ST21R and ST22R are designed for drives using RLL
(2,7) data encoding and a 7.5 Mbit/sec. I/O data transfer rate.
Seagate RLL drives are easily recognized by an R after the model
number, e.g., ST157R. Seagate Technology, Inc. assumes no
liability for installation of an RLL controller with an
MFM-certified drive.
* The ST22M and ST22R have an onboard floppy diskette
controller which supports two diskette drives in the following
formats:
- 3.5-inch, 720K Byte/1.44M Byte
- 5.25-inch, 360K Byte/1.2 M Byte
* The ST21 and ST22 have a unique recording format and
therefore require all attached drives to be installed by one of
the processes described in this guide before operation.
This publication may be used with SEAGATE Paired Program drives
or as a controller-only installation guide.
Paired program drives are shipped with a Seagate controller. They
are recognized by a PR label on the drive top cover. Paired
drives are shipped formatted with a small DOS partition
containing the installation program, INSTALLR, which will
low-level format and partition your drive. You must supply the
DOS program. The ST21/ST22 can recognize whether a drive has a
Paired Program software loaded, or has been previously installed.
2
Paired Program drives with formatted capacities greater than 32
MBytes have DISK MANAGER (customized by ONTRACK for Seagate)
partitioning software loaded. Instructions on installing Paired
Program drives begin in Section 3.0.
---------------------------------------
Before You Begin...
Inspect the controller, drive, cables, mounting
hardware/accessories, documentation and packaging. If any item is
incorrect, missing or appears damaged, contact your Distributor
or Dealer immediately.
Handling: Improper handling during transit/shipping accounts for
many "installation" problems. Prior to installation, handle your
drive/controller carefully.
Observe Static-Discharge Precautions: Keep the drive/controller in
their static-shielded bags until you are ready to complete the
installation. Use a grounded wrist-strap at your workstation; if
unavailable, ground yourself frequently by touching the metal
chasis of the system before handling any components. Avoid
static-inducing carpeted areas.
Shipping: When transporting or shipping a drive or controller, a
Seagate-approved container must be used. Keep your original box.
They are easily identified by a red label identifying them as a
Seagate Approved Package.
Shipping the drive in a non-approved container will void the drive
warranty.
Repair centers may refuse receipt of components improperly
packaged or obviously damaged in transit. Contact your
Distributor to purchase additional boxes. Seagate recommends
shipping by an air-ride carrier experienced in handling computer
equipment.
Maintenance: Seagate disc drives do not require any preventative
maintenance. The head/disc assembly is sealed and does not
contain any user-servicable components. Tampering with the
factory-seal will void the warranty.
3
1.0 ST21, ST22 Setup and Installation
Caution: Do not handle a drive/controller without observing
static-discharge precautions. A grounded wrist-strap is
preferred; if unavailable, ground yourself frequently by
touching the metal chasis of the system before handling any
components. Do not unpack the drive/controller until you are
ready to complete the installation.
During the formatting process, you will be asked to enter some
simple drive specifications. Refer to Figures 1-2 for basic
specifications. For non-Seagate drives, refer to the
manufacturer's instructions.
Important Note: A Drive Type must be set in the AT system CMOS if
the controller BIOS is disabled. See Section 2.6.
4
Figure 1: Seagate MFM Drive Setup - ST21M/ST22M
Model | Formatted | R/W | Data | Sectors | R/W Head | Write
| MBytes | Heads | Cyls.| / Track | Auto-Park | Precomp
================================================================
ST124 | 21.4 | 4 | 615 | 17 | No | None
ST125 | 21.4 | 4 | 615 | 17 | Yes | None
ST138 | 32.1 | 6 | 615 | 17 | Yes | None
ST151 | 42.5 | 5 | 977 | 17 | Yes | None
ST225 | 21.4 | 4 | 615 | 17 | No | Cylinder
| | | | | | 300
ST252 | 42.8 | 6 | 820 | 17 | Yes | None
ST251 | 42.8 | 6 | 820 | 17 | Yes | None
ST4053| 44.5 | 5 | 1024 | 17 | Yes | None
ST4096| 80.2 | 9 | 1024 | 17 | Yes | None
ST1100| 83.9 | 9 |*1072 | 17 | Yes | None
5
Figure 2: Seagate RLL Drive Setup - ST21R/ST22R
Model | Formatted| R/W | Data | Sectors | R/W Head | Write
| MBytes | Heads | Cyls.| / Track | Auto-Park | Precomp
================================================================
ST138R | 32.7 | 4 | 615 | 26 | Yes | None
ST157R | 49.1 | 6 | 615 | 26 | Yes | None
ST225R | 21.17 | 2 | 667 | 31 | No | None
ST238R | 32.7 | 4 | 615 | 26 | No | None
ST250R | 42.9 | 4 | 667 | 31 | No | None
ST278R | 65.5 | 6 | 820 | 26 | Yes | None
ST277R | 65.5 | 6 | 820 | 26 | Yes | None
ST4144R| 122.7 | 9 | 1024 | 26 | Yes | None
ST1150R| 128.4 | 9 |*1072 | 26 | Yes | None
Data Cylinders: User cylinders are calculated from logical zero,
i.e., 0 to 614 equal 615 cylinders.
* Note: The ST21/ST22 can address a maximum of 16 R/W heads and
1,024 cylinders.
Interleave: Use 1:1 interleave as indicated in installation
routine.
Read/Write Head Parking: A PARK program is preloaded on all
Paired Program drives, PARK.EXE or PARK.COM, which the INSTALLR
software will copy to a diskette during installation. The
following drives require parking before the drive/system is
transp