
W D   9 5 0 4 8   A    WESTERN DIGITAL
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders     782|     |     |
Capacity form/unform    41/      MB        Heads           4|     |     |
Seek time   / track  70.0/     ms          Sector/track   27|     |     |
Controller           IDE / AT              Precompensation
Cache/Buffer               KB              Landing Zone      862
Data transfer rate    0.938 MB/S int       Bytes/Sector      512
                      0.938 MB/S ext
Recording method     RLL 2/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C        40 50    |    -40 60
Power: sleep              W     Humidity     %         8 80    |      5 95
       standby            W     Altitude    km    -0.458  2.898| -0.458 12.192
       idle               W     Shock        g        10       |     40
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA        40
       spin-up            W     ECC        Bit   22
                                MTBF         h      40000
                                Warranty Month        12
Lift/Lock/Park     NO           Certificates                                  

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WESTERN  WD93028/93048/95028/95048-/A  INSTALLATION GUIDE

  +---------------------------------------------------------+
  |                                                         |XX I
  |                                                         |XX N
  |                                                         |XX T
  |                                                         |XX E
  |                                                         |XX R
  |                                                         |*X F  J2
  |                                                         |XX A
  |                                                         |XX C
  |                                                         |XX E
  |                                                         |XX
  |                                                         |XX1
  |                                                         |6-5 J8
  |                                                         || |
  ++LED                                                     |2-1
  ++                                                        |XX J1
  |                                                         |XX Power
  +---------------------------------------------------------+







                         J2                    J8     J1
    +39------------------------------------1++5-3-1++-------+
    |o o o o o o o o o o o o o o o o o o o o||o o o||O O O O|
    |o o o o o o o o o o   o o o o o o o o o||o o o||1 2 3 4|
  --+40------------------------------------2++6-4-2+++-+-+-++----
                                                     | | |  +5V
                   (Pin 20 keyed)                    | | +- GND
                                                     | +--- GND
                                                     +----- +12V



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WESTERN  WD93028/93048/95028/95048/-A  INSTALLATION GUIDE

 Jumper Setting
 ==============

 Single and Dual (Master/Slave) Installations
 --------------------------------------------
 The installation procedures describe a single or dual installation.
 An intelligent drive is compatible with other intelligent drives that
 support a master/slave configuration. ST-506 hard drives using a
 standard AT controller are NOT compatible.

 If you are installing an intelligent drive and a WDAT adapter board
 in am IBM PC AT that currently has an original Conner CP342 or CP3022
 drive, you will discover that these drives are incompatible. Only one
 drive can be functional, depending upon the jumper configuration of
 the WDAT adapter board. This restriction does not apply to AT
 compatible systems.


 J8  Master/Slave Configuration
 ------------------------------
 Verify that the jumper shunts on the drive's J8 jumper block are
 properly installed to match your configuration choices.

 Single installation:

    Only
   +5-3-1+ If this is your first and ONLY intelligent drive in your
   |o o o| system their should NO JUMPERS installed on J8.
   |o o o|
   +6-4-2+


 Dual installation:

   Master      Slave
   +5-3-1+     +5-3-1+ if you are installing two intelligent drives
   |X o o|     |o X o| you must designate one of them as the
   |X o o|     |o X o| primary or "master" and the other as the
   +6-4-2+     +6-4-2+ secondary or "slave". Jumper your Western
                       Digital intelligent drive accordingly: A
                       jumper on pins 3-4 designates an intelligent
                       drive as a slave; a jumper on pins 5-6
                       designates an intelligent drive as a master.


 Installation with a pre-existing Conner CP342 or CP3022 drive:

   +5-3-1+ Configure the Western Digital drive as the slave. Install
   |o X X| jumpers on the drive's J8 jumper block as shown. The Conner
   |o X X| drive should be configured as the master.
   +6-4-2+



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WESTERN  WD93028/93048/95028/95048/-A/AD  INSTALLATION GUIDE

 Notes on Installation
 =====================


 Gather Supplies
 ---------------
 If your computer's motherboard has a 40-pin connector for installa-
 tion of a hard disk drive, you will need the following items:

 - Your Western Digital Drive:

   Capacity        3.5 inch     5.25 inch
   20 MB           WD93028-A    WD95028-A
   40 MB           WD93048-A    WD95048-A

 - One 40-pin interface cable (12 inches maximum length)

 - This installation Guide

 - Optional mounting frame, bezel and LED

 If there is not a 40-pin connector on the motherboard, your drive
 will additionally require:

 - An adapter card such as those available from Western Digital:
   - WDAT-140 (provides connector for one hard drive)

   - WDAT-240 (provides a connector for both a hard drive and a floppy
     drive)

   - WDAT-440 (provides a hard drive connector, one floppy drive
     connector, two serial ports, and one parallel port).

 Other standard 40-pin adapter cards may also be compatible with your
 drive.

 Interface Connector: 2x20 pin right angle .1" Berg stick (pin 20
                      keyed)

 Cable Type: 40-conductor mass terminated flat ribbon

 Cable Length: 12 inches maximum

 Power Connector: 4 Pin MOLEX P/N 15-24-4041

 Mating Connector: AMP 1-480424-0 (Body)
                   AMP 60619-4 (Pins)

 Interface Wire Gage: 18 AWG



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WESTERN  WD93028/93048/95028/95048/-A/AD  INSTALLATION MANUAL

 Product Description
 -------------------
 Western Digital's WD93028-A and WD93048-A are intelligent drive
 products for the IBM PC/AT and compatibles. Their architectures
 integrate an ST-412/ST-506 compatible hard drive assembly with a
 controller on a single printed circuit board that is mounted on the
 disk drive chassis. The integration of disk drive and controller
 increases reliability and performance by eliminating redundant
 circuitry. Models WD93028-A and WD93048-A offer 20 megabytes and 40
 megabytes of storage, respectively, in a 3.5 inch form factor. These
 drives are also available in a 5.25 inch frame (WD95028-a and
 WD95048-A).

 With your new Western Digital drive you'll enjoy these benefits of
 hard disk storage:

  The convenience of booting from a hard disk drive.

  The ability to easily store numerous files and programs and work
  with large documents or data bases.


 Product Feature
 ---------------
 - PC/AT compatible design based on Western Digital's WD42C22A Host
   Interface and Disk controller

 - Data separator and write precompensation logic designed for optimal
   media compatibility

 - 16-Bit, bi-directional command/data bus

 - Data transfer rate of 7.75 Mbits per second (RLL encoding)

 - Error detection/correction

 - Automatic retries on all read/write operations

 - Extensive self-test capability

 - 3:1 interleave for increased data throughput

 - Supports any logical drive type of equal or less capacity


 System Requirements
 -------------------
 You can use your drive in an IBM PC/AT or compatible system that has
 Disk Operating System (DOS) version 3.0 or later. Consult your
 Western Digital representative/dealer if you need information about
 other operating systems.


 Low-level Format
 ----------------
 Your Western Digital drive has been preformatted at the factory.
 However, if you should need to reformat your drive, Western Digital
 provides a format utility, WDFMT, that allows you to perform a low-
 level format of the drive. Disk verification, surface analysis, and
 bad track entry routines are also included in this utility. You may
 use an equivalent formatting program, if it formats 27 sectors. Do
 not use IBM's Advanced Diagnostic to perform a low-level format as it
 can only format 17 sectors per track.


 Tips and Troubleshooting
 ------------------------
 It is becomes necessary to move your cimputer system, park the heads
 first. Parking the drive heads move the heads to a safe, non-data
 landing zone (zone 862). This helps protect the media and the heads
 from accidental damage due to vibration, moving or shipping. Consult
 your DOS manual. If your version o fDOS does not provide a head
 parking command, there are a number of utility programs that can
 provide this feature. Western Digital offers a park routine called
 PARKIDE.

 If your drive is not performing properly, first check your physical
 installation. Check for reserved cables, an overloaded system power
 supply, incorrect drive selection, etc.


