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UINSTALL.TXT
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1989-03-09
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INTRODUCTION
This file is organized to assist you in the installation of your
Seagate disc drive. The process entails configuring, mounting and
formatting your drive. Please note that information on product
specifications is given in the product specification section of this
bulletin board and will not be repeated here.
Before attempting any installation, please read through all applicable
sections of the installation instructions. The sections are organized as
follows:
1. This Introduction.
2. Describes the configuration of an ST412/506 Interface Drive.
3. Describes the configuration of an SCSI Interface drive.
4. Defines the physical drive installation procedure.
5. Describes the formatting operations necessary to use your drive
with PC-DOS/MS-DOS.
Before You Begin
- Verify that the system is switched off and disconnected from main power
before any installation is attempted.
- Do not unpack a drive until you are ready to install it in the system.
- Always handle the drive by the frame or casting.
- Do not touch the board components or connectors without observing
static-discharge precautions.
- Seagate disc drives do not require any preventative maintenance. The
head/disc assembly is sealed and does not contain any user serviceable
components. Do not tamper with the sealed top cover. Doing so will
void your warranty.
- When transporting or shipping a drive or system, please ensure that they
are correctly packed in the original container and shipped via an air-
ride carrier.
ST412/506 Interface Drive Configuration
MFM Controller Selection
The hard disc controller you use will affect the performance of the drive.
To achieve full performance with an MFM drive, you must use an MFM
controller which operates the ST412/506/MFM interface at 5.0 megabits/sec.
Seagate does not recommend or endorse any particular controller.
Operation of an MFM drive at data rates other than 5.0 megabits/sec. or
operation of an MFM drive with an RLL controller is not approved by Seagate
and will void your warranty.
RLL Controller Selection
To achieve full performance with a Run Length Limited (RLL) drive you must
use an RLL (2,7) controller which operates the ST412/506/RLL interface at
7.5 megabits/sec.
Only Seagate drives with an R appended to the product number are designed
and certified for use with a Run Length Limited (RLL 2,7) controller.
Note: early ST238, RLL drives did not have the R suffix but are certified
for use with RLL.
Operation of an RLL drive at data rates other than 7.5 megabits/sec. or
operation of an RLL drive with an MFM controller is not approved by Seagate
and will void your warranty.
Write Precompensation
For optimum performance, provide write precompensation on only the
ST412/506/MFM drives listed below. Drives not listed do not require write
precompensation. (See the glossary section of this bulletin board for a
description of write precompensation.)
ST213, ST225 Cylinders 300 to 614
ST4038 Cylinders 300 to 732
Some controllers provide a default precompensation setting from cylinder
256. The ST213/225/4038 will perform adequately at this default.
Drive Select Jumpers
A jumper must be installed to select the desired "Drive Select" number.
The drive select jumpers are a series of 2 pin jumpers located between the
PC Board edge connectors. Drive select 1 is selected by putting the jumper
vertically on the 2 pins that are closest to the smaller (20 pin) edge
connector. Similarly, drive select 2 is selected by putting the jumper
vertically on the second set of 2 pins as you count away from the smaller
edge connector.
IBM PC/XT/AT and Compatibles Installations:
Examine the 34 pin ribbon cable (the wider cable) that connects the
controller to the J1 connector on the drive. In many cases the cable will
have connectors at both ends and a connector about six inches from one end.
The end with two connectors is connected to the drive. The other end is
connected to the controller. Next check to see if the ribbon cable has a
split with a group of wires twisted between the two connectors at the drive
end of the cable.
"C" Drive Configuration:
-If you have a cable with a twist in it, configure the drive as drive select
2.
-If you have a cable with no twist, configure the drive as drive select 1.
"D" Drive Configuration:
-If you are connecting a second hard disc drive to the system, configure the
drive as drive select 2.
Attach the Cables:
Note that at all connections, pin 1 on the controller corresponds to pin 1
on the drive. Most cables have a contrasting colored wire (usually red or
blue) on one edge of the cable to indicate pin 1. For both J1 and J2 edge
connectors, pin 1 is facing the DC power connector J3. On the controller,
pin 1 is often indicated by a 1 etched into the board or a square solder
pad on the back.
Connect the J1 connector on the "C" drive to the connector at the end of
the wide ribbon cable. Connect the J1 connector on the "D" drive to the
middle connector on your wide ribbon cable. Connect the J2 connectors on
each drive to the smaller ribbon cables and connect the cables to the
appropriate connectors on the controller.
Resistor Termination Packs
Each Seagate drive comes from the factory with a resistor termination pack
installed. If you are installing a single hard drive, the resistor pack
must remain installed. If you are installing two hard drives, you must
remove the resistor termination pack from the "D" drive (the one connected
to the middle of the cable).
The resistor termination pack is usually a thin plastic component with 10
legs located in a socket on the drive's PC Board very near the J1
connector. Please refer to the figures in the universal installation
guide.
When reinstalling the resistor termination pack, note that pin 1 on the
pack is denoted by a dot or numeral one. A square pad on the drive board
indicates pin 1 at the socket.
Read/Write Head Auto-Park
All Seagate disc drives, with the exception of the ST213, ST225, ST225N and
ST238R products, have an automatic read/write head parking function at
power off. This feature does not require operator intervention.
Some versions of DOS support a parking command for the products listed
above. Refer to the system documentation. Third party software is also
available for this task. Contact your dealer, distributor or systems
integrator.
Note that parking routines should not be used with drives that have the
auto-park feature.
SCSI INTERFACE DRIVE CONFIGURATION
Seagate intelligent drives, designated by an N appended to the product
number, i.e. ST251N, have an onboard controller that supports the SCSI
interface as defined in the ANSI X3T9.2/82 document.
SCSI INTERFACE CABLE CONFIGURATION
System connection is via a 50-pin, SCSI connector. Pin-1, on the cable, is
usually indicated by a colored stripe, (red or blue). When connecting the
cable to the drive, the stripe should always be next to the power
connector. When using a Seagate host adaptor, pin-1 is marked by a 1 by
the connector. Strain relief is recommended at the cable.
SCSI ADDRESS SELECTION
The SCSI address jumpers are located adjacent to the 50-pin, SCSI
interface connector. Seagate ships the drives set for ID 0,(drive number
1). This means no jumpers should be shorting, except the P-jumper for
parity. (see below)
OPTIONAL PARITY BIT ENABLE
Some system buses require parity bit checking. Consult the system
documentation for the specific requirements.
Most drives have an additional two jumper pins to enable parity. They are
located with the SCSI address jumper pins. To enable parity, short the P-
jumper pins. To disable parity, remove the P-jumper. The parity jumper
pins are the set of pins closest to the SCSI cable.
NOTE: Earlier versions of the ST225N may not have these jumper pins, and this
option is