Seagate ST9235 Family User manual

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ST9235 Family:
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ST9080A
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ST9145A, ST9145AG
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ST9235A, ST9235AG
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Installation Guide
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Contents
Read before you begin... . . . . . . . . . . . . . . 1
Installation overview . . . . . . . . . . . . . . . . . . . . 2
Setting master/slave jumpers . . . . . . . . . . . . . . . 3
Connecting cables . . . . . . . . . . . . . . . . . . . . . 3
Mounting the drive . . . . . . . . . . . . . . . . . . . . . 5
Configuring system BIOS . . . . . . . . . . . . . . . . . . 5
Formatting and partitioning the drive . . . . . . . . . . . 8
Installation troubleshooting . . . . . . . . . . . . . . . . 9
Appendix A. AT interface connector pin assignments . 11
Appendix B. Mounting dimension drawings . . . . . . . 12
Appendix C. Technical support services . . . . . . . . 15
© 1993 Seagate Technology, Inc. All rights reserved
Publication Number: 36216-001, Rev. B
Seagate®
, Seagate Technology® , and the Seagate logo are reg-
istered trademarks of SeagateTechnology, Inc.SeaFAX, Sea-
FONE, SeaTDD, and SeaBOARDare trademarks of
Seagate Technology, Inc. Other product names are trademarks
or registered 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 of Seagate
Technology, Inc.

Read before you begin ...
Note. Drives in the ST9235 family are usually installed in note-
book or laptop systems. Special training or tools may be
needed to service these computers. In some instances,
opening the case may void your warranty. Be sure to
review the terms and conditions of your system warranty
before opening the system enclosure.
Warning. Always power off and unplug your computer system
before touching any internal components.
Observe static discharge precautions.
•Keep the drivein its static-shieldedbag until you are readyto
complete the installation.
•Do not touch the PC board or the I/O connector pins.
•Always handle the drive by its edges or frame. Never apply
pressure to the PC Board or to the drive’s top cover.
•Use a grounded wrist strap. If none is available, ground
yourself by touching the metal chassis of the system before
handling any components.
•Use antistatic padding on all work surfaces and avoid static-
inducing carpeted areas.
Inspection.When you are familiar withthe handlingprecautions
listed above, inspect the drive. If it appears to be damaged,
contact your distributor or dealer immediately.
Handle drives carefully. Improper handling during transit or
shipping accounts for many installation problems. Even minor
bumpscanexertrelativelylargeGforcesonthesedrives.Always
handle the drive carefully. In addition, do not attach any labels to
the drive top cover, as they may prevent proper ventilation.
ST9235 Family Installation Guide, Rev. B 1

Warranty. Contact your authorized Seagate distributor or dealer
for warranty information.
Maintenance and repair. Seagate drives do not require any
preventive maintenance. The head/disc assembly is sealed and
doesnotcontainanyuser-serviceablecomponents.Tamperingwith
the factory seal voids the warranty. Seagate customer service
centers are the only facilities authorized to service Seagate drives.
Seagate does not sanctionany third-party repair facilities.
Shipping. When transporting or shipping a drive,
you must use a
Seagate-approved container. If possible, use an original Seagate
shipping box with a
Seagate Approved Package label. Shipping a
drive ina nonapproved container voids the drive warranty.
Seagate service centers may refuse receipt of components
improperly packaged or obviously damaged in transit. Call your
authorized Seagate distributor to purchase additional boxes.
Seagaterecommendsshippingbyanair-ridecarrierexperienced
in handling computer equipment.
Installation overview
Drive installation can be divided into several logicalsteps:
1. Setting master/slave jumpers
2. Connecting cables
3. Mounting the drive
4. Configuring the system BIOS
5. Formatting and partitioning the drive
Each of these steps is describedin detail on the followingpages.
Somemaynotbeapplicabletoyourparticularinstallationrequire-
ments.
2 ST9235 Family Installation Guide, Rev. B

Setting master/slave jumpers
Two drives may be controlled through a single drive controller
cable with two connectors. In this case, one drive is designated
as the masterandtheotheris designated asthe slave. Asshown
in Figure 1 on page 4, the jumpers on each drive must be set to
identify which drive is master and which is slave.
Connecting cables
The ST9235 Family drives use a 44-pin AT interface connector
cable with two rows of 22 female contacts on 0.079 inch (2 mm)
centers (see Figure 1). Pin assignments for the AT interface are
listed in Appendix A.
Most cables have a stripe down one side, which designates pin
1. Make sure pin 1 on the interface cable connector is aligned to
pin 1 on the drive interface connector and pin 1 on the host
connector.Toassistincablealignment,pin20hasbeenremoved
on the male interface connector on the drive. This type of
connector is designed to be used with a keyed cable connector
having a plug in place of pin 20.
Before mounting the drive, be sure that the connecting cable is
long enough to reach the drive, but not so long that it will be
pinched when the system enclosure is replaced. Connecting
cables for the ST9235 family drives must not be longer than 18
inches (457 mm).
Power connections
PowerfortheST9235familydrivesissuppliedthroughthe44-pin
interface connector (see Appendix A for specific pin assign-
ments).
Caution. These drives can accept only +5 volts DC power. Do
not use +12 volts DC power.
ST9235 Family Installation Guide, Rev. B 3

Master/slave
configuration jumpers
Circuit board
Pin 1
Pin 20 removed for keying
Drive is master; no slave present
Drive is master; Seagate slave drive present
Drive is slave; Seagate master drive present
Reserved positions (do not use)
Note. Drive is shown with
circuit board up.
A C
B D
Figure 1. AT interface cable connector and master/slave
configuration jumpers
4 ST9235 Family Installation Guide, Rev. B

Mounting the drive
You can mount (and operate) a ST9235 family drive in any
orientation.However,youmustsecurelyattachthedrivetoarigid
frame using four side-mounting screws or four bottom-mounting
screws.
Caution: To avoid damaging the drive:
•Use M3X0.5
metric mounting screws only .
•Do not insert mounting screws more than 0.150 inches
(3.81 mm) into the mounting holes (except: 0.190 inches
(4.82 mm) forthebottom-mounting holesof the ST9235A and
ST9235AG).
•Do
not overtighten the screws (maximum torque: 3 inch-lb).
Allow a minimum clearance of 0.030 inches (0.762 mm) around
the entire perimeter of the drive for cooling airflow.
Mounting dimension drawings for the ST9235 family drives are
provided in Appendix B. As shown in these drawings, some
ST9235 family drives conform to the industry standard MCC
mounting specification. Refer to the
ST9235 Family Product
Manual
(Seagate publication 36206-001) for further details.
Configuring system BIOS
Before the host system can recognize a new drive, you must
enterbasicinformationaboutthedriveintothehostsystemBIOS.
Specifically, you need to know the number of cylinders, heads,
and sectors, as well as the overall capacity of the drive you are
installing. The table on page 6 lists these specifications for the
ST9235 family drives. It is not necessary to understand these
terms to set up the system BIOS.
Read your system documentation or run your system setup
program (described on the following page) to determine which
ST9235 Family Installation Guide, Rev. B 5

drive types your BIOS supports. Another method is to run the
FINDTYPE.EXE utility program, available from Seagate Techni-
cal Support services (on the SeaBOARD BBS) as described in
Appendix C.
The methods used to configure system BIOS vary from system
to system. In many cases you can run a setup program from the
DOS prompt. In other cases, you must initiate BIOS setup by
pressingcertain keys while the system is booting up.
Within the setup program, there are three possible ways that you
can specify your drive type:
•Match your drive specifications (from the table below) with
those of a drive type specified in the setup program.
•Specify a custom or user-defined drive type in the setup
program, then manually enter your drive specifications from
the table below.
•Selectspecifications lower thanthose required for your drive,
and allow your drive to mimic the drive type selected.
Drive Specification ST9080A ST9145A & ST9145AG ST9235A & ST9235AG
No. cylinders 823 980 985
No. read/write heads 4 15 13
No. sectors per track 38 17 32
Total No. sectors 125,096 249,900 409,760
Capacity (Mbytes)
BIOS calculated 61.0 122.0 200.0
Usable 64.0 127.9 209.7
When the drive specifications are entered manually as a user-
defined or custom drive type, the BIOS should display a drive
capacity equal to that listed as BIOS calculated capacity in the
6 ST9235 Family Installation Guide, Rev. B

table above. This value will be lower than the usable drive
capacity.
Ina fewsituations, none ofthedrivetypesspecified inyourBIOS
setup program will match your drive, and the setup program will
not provide an opportunity to specify a custom drive type. In this
case, consider the third option describedabove —allowing your
ST9235 family drive to mimic one of the BIOS-supported drive
types.During the BIOS setup process, simply select a drive type
with a capacity that is
less than or equal to the drive’s BIOS
calculated capacity listed in the table on page 6. This drive type
should have no more than 16 read/write heads or63 sectors per
track. In addition, the total number of sectors for that drive type
(listed in the setup program) should not exceed the number of
cylinderstimesthenumberofread/writeheadstimesthenumber
of sectors per track. In other words:
Total sectors per drive ≤
(
No. cylinders ) ×( No. read/write heads ) ×( No. sectors per track )
BIOS compatibility recommendations
The ST9235 family drives are AT interface compatible drives,
whichconformtoATAspecifications.ThehostsystemBIOSmust
provide support for the AT interface command set. Consult the
system documentation for information on the AT interface within
your system. Several key compatibility issues are discussed
below.
In accordance with ATAspecifications, the BIOS must reset any
emulation/translation parameters after a hard reset is received
from the host.
In some configurations, the ST9235 family AT interface drives
supply 11 bytes of Error Correction Code (ECC) with the Read
Long and Write Long commands. Depending on the drive type,
ST9235 Family Installation Guide, Rev. B 7

your system BIOS may look for 4 bytes of ECC. If your system
BIOS expects 4 bytes of ECC and the drive supplies a different
number of bytes, some drive diagnostic programs may fail,
typically resulting in time-out errors. Consult your system docu-
mentation or call your system dealer or manufacturer for infor-
mation on configuring your system to receive 11 bytes of ECC.
Formatting and partitioning the drive
Caution. Formatting or partitioning a drive that contains data
may result in a partial or complete loss of that data.
Make sure all data has been safely backed up before
repartitioning or reformatting a drive. Seagate Tech-
nology assumes no liability for lost data.
Low-level formatting
SeagateATInterfacedrivesarelow-levelformattedatthefactory
and do not require additional low-level formatting prior to use.
Partitioning
Asingle disc drive can be subdivided into partitions that behave
as separate drives (labeled C, D, E, etc.). Versions of DOS prior
toVersion4.0 are not able to access more than32 Mbytesof disc
space as a single drive. Therefore, drives having a capacity of
over 32 Mbytes
must be divided into several smaller partitions
for use with these older versions of DOS. Seagate does not
recommend using ST9235 family drives withDOS versions prior to
Version 3.3.
To partition a drive, you must first boot the system usinga floppy
disk that contains system files. Partition the drive using the DOS
FDISKutilityprogram (describedinyourDOSmanual).Ifyouare
partitioning a drive that will be used to boot the system, make
sure that the primary DOS partition is marked active.
8 ST9235 Family Installation Guide, Rev. B