W D   9 5 0 2 4   X    WESTERN DIGITAL
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders     782|  615|     |
Capacity form/unform    22/      MB        Heads           2|    4|     |
Seek time   / track  39.0/ 5.0 ms          Sector/track   27|   17|     |
Controller           IDE / XT              Precompensation   784
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        10 50    |    -40 60
Power: sleep              W     Humidity     %         8 80    |      5 95
       standby            W     Altitude    km    -0.450  3.048| -0.450 12.192
       idle           7.4 W     Shock        g         5       |     40
       seek               W     Rotation   RPM      3329
       read/write     9.3 W     Acoustic   dBA        40
       spin-up            W     ECC        Bit   56
                                MTBF         h      40000
                                Warranty Month        12
Lift/Lock/Park     NO           Certificates     CSA,FCC,IEC435,TUV,UL478,VDE  
 
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WESTERN  WD93024/93034/93044-X  TECHNICAL REFERENCE MANUAL 0098S 10/89
 
  +---------------------------------------------------------+
  |                                                         |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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                      J   U   M   P   E   R   S
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WESTERN  WD93024/93034/93044-X  TECHNICAL REFERENCE MANUAL 0098S 10/89
 
 Jumper Setting
 ==============
 
 Verify that the jumpers on the intelligent storage peripheral's J8
 connector are properly installed to match your configuration choices.
 
 
 
 J8  Physical/Translate Mode Configuration
 -----------------------------------------
 
  Physical Mode  Translate Mode
     +5-3-1+       +5-3-1+
     |o o X|       |o o o|
     |o o X|       |o o o|
     +6-4-2+       +6-4-2+
 
 Physical Mode vs. Translate Mode:
 The physical mode presents the intelligent storage peripheral's
 actual physical parameters to the system. If your version of DOS
 only recognizes 17 sectors per track, use the translate mode jumper
 configuration (no jumper installed).
 
 
 
 J8  IRQ5/IRQ2 Configuration
 ---------------------------
 
  IRQ5 (Default)    IRQ2
     +5-3-1+       +5-3-1+ Note: The control processor firmware sets
     |o o o|       |X o o| the configuration register (host port 322)
     |o o o|       |X o o| according to the interrupt selection
     +6-4-2+       +6-4-2+ indicated, but the jumper selection does
                           not physically select the interrupt level.
                           The actual selection of the interrupt is
                           done on the adapter card or on the mother-
                           board.
 
 IRQ5 is the default priority interrupt level. If you need to select
 IRQ2, place a jumper on pins 5-6 of J8 connector. The mechanical
 connection to the host interface connector (pin 31) accomplishes
 this. Bit 6 of the configuration register (host port 322) is set to
 according to the jumper selection.
 
 
 J8  Optional DMA Demand Mode
 ----------------------------
   +5-3-1+ Note: Western Digital's Super BIOS version 2.1 or greater
   |o X o| can program the controller for DMA demand mode.
   |o X o|
   +6-4-2+
 
 To select the controller DMA demand mode, jumper pins 3-4 of J8. This
 mode improves the data transfer rate and overall system performance.
 This option is only valid for systems that have a BIOS or operating
 system that can program the DMA controller in the demand mode and
 sense the mode selection "handshake" function. The DMA demand mode
 offers a sector interleave of 2:1 instead of the standard 3:1 inter-
 leave.
 
 
 
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WESTERN  WD93024/93034/93044-X  TECHNICAL REFERENCE MANUAL 0098S 10/89
 
 Notes on Installation
 =====================
 
 Drive mounting
 --------------
 
     horizontally             vertically
   +-----------------+   +--+             +--+ +------------------+
   |                 |   |  +-----+ +-----+  | |                  | x
   |                 |   |  |     | |     |  | x+----------------+x
 +-+-----------------+-+ |  |     | |     |  | ||x              x||
 +---------------------+ |  |     | |     |  | ||  x          x  ||
                         |  |     | |     |  | ||    x      x    ||
      x           x      |  |     | |     |  | ||      x  x      ||
 +------x------x-------+ |  +-----+ +-----+  | ||       xx       ||
 +-+------x--x-------+-+ +--+             +--+ ||     x    x     ||
   |       xx        |                         ||   x        x   ||
   |     x    x      |                         || x            x ||
   +---x--------x----+                         |x                x|
     x            x                           x++----------------++x
 
 
 The intelligent storage pheriperal can be mounted in many different
 ways depending upon the physical design of your system. After
 securely mounting the intelligent storage peripheral, verify that
 nothing interferes with the free movement of its shock mounts.
 Mount the intelligent storage peripheral to the chassis using four
 6-32 screws.
 
 WARNING
 The only electrical ground contact should be from the mounting
 bracket to the frame on the host system. Do not ground to the
 casting. Screws which are too long will cause a ground loop to the
 intelligent storage peripheral and defeat the shock mounting or
 possibly damage board components. The screw should engage no more
 than six threads (3/16 inch).
 
 
 Interface Cable
 ---------------
 The interface cable should be kept as short as possible to minimize
 noise which is induced on the data and control buses. Western
 Digital recommendes an "untwisted" cable no longer than 18 inches. If
 your installation requires a longer cable, then use a buffered cable
 to minimize the introduction of noise from the host system into the
 I/O channel. Noise may cause erratic operation of the host system.
 
 WARNING
 Damage to the intelligent storage peripheral may occur if the inter-
 face cable is attached incorrectly. To prevent an incorrect
 connection, make certain you are using an interface cable which has
 been keyed at both the drive and host ends. The female connector on
 the interface cable will have a plug in position 20 to prevent in-
 correct connection.
 
 
 Dual Installation
 -----------------
 Dual XT installations require that you install a Western Digital
 adapter card. The WDXT-140 supports two intelligent storage
 peripherals. If you are adding a WD93024-X, 34-X or 44-X as a
 secondary peripheral in an XT system, use the WDXT-150 adapter card
 which has jumper selectable addressing. Do not daisy chain the
 peripherals. Each peripheral will have its own adapter/controller
 card. The primary peripheral is selected at port address 320H: the
 secondary peripheral is selected at port address 324H. Please refer
 to your adapter card manual and to the installation.
 
 If the intelligent storage peripheral is being installed in an AT
 system as secondary drive, the AT drive and Western Digital's
 intelligent storage peripheral will each have their own adapter/
 controller cards. The Western Digital peripheral requires an XT150
 adapter card jumpered for port 324H. Do NOT identify the Western
 Digital peripheral in the AT setup program.
 
 If you only have one internal power connector, you will require a
 Y-adapter to provide power to both units. If your system does not
 provide a power connector, install an XT150 adapter board.
 
 
 LED
 ---
 If your system has an activity LED cable, plug it into J6 on the
 intelligent storage peripheral.
 
 
 Head Parking
 ------------
 It is becomes necessary to move your computer system, park the heads
 first at physical cylinder 862. Parking the heads moves the heads to
 a safe, non-data landing zone. This helps protect the media and the
 heads from accidental damage due to vibration, moving or shipping.
 Consult your DOS manual. If your vision of DOS does not provide a
 head parking command, there are a number of utility programs that can
 provide this feature. Western Digital offers a parking routine called
 PARKIDE.
 
 
 Connectors
 ----------
 Power Connector         4 Pin (WD40-001114-000)
 Interface Connector     2x20 pin RA (WD41-001062-000), pin 20 keyed
 Interface Cable         40 Conductor Ribbon - 18 Inches Maximum
 Power Cable Wire Gauge  18 AWG Maximum
 
 
 
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WESTERN  WD93024/93034/93044-X  TECHNICAL REFERENCE MANUAL 0098S 10/89
 
 
 General Description
 ===================
 Western Digital's family of intelligent storage peripherals provides
 a choice of data storage capacities for the IBM PC/XT and
 compatibles. Because of their small size, the WD93024-X, WD93034-X,
 and WD93044-X are easily incorporated into systems with limited
 space. They can also be used as secondary storage peripherals in AT
 systems.
 
 Models WD93024-X, WD93034-X, and WD93044-X offer 20, 30, and 40 mega-
 bytes of storage, respectively, in a 3.5 inch form factor. These
 intelligent storage peripherals are also available in 5.25 inch
 frames (WD95024-X, WD95034-X, and WD95044-X).
 
 Bezel and LED indicator options are available. Contact your Western
 Digital representative for the part number required for your
 configuration.
 
 
 Seek Time
 ---------
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |   5    |
       +----------------------------------+--------+
       |Average                msec. typ. |  39    |
       |                       msec. max. |  63    |
       +----------------------------------+--------+
       |Latency                msec. avg. |   9    |
       +----------------------------------+--------+
 
 
 Low-Level Formatting
 --------------------
 You do not need to perform a low-level format. Western Digital's
 intelligent storage peripheral has already been preformatted at the
 factory. The bad track information listed on the top of the drive
 will be mapped out when you use the DOS FORMAT utility. If you ever
 find it necessary to reformat, use Western Digital's IDE SuperBIOS
 program. This program also allows the user to enter defect
 information and to create two virtual partitions.
 
 
 Translation
 -----------
 The intelligent storage peripheral provides two modes, physical or
 translate, for data storage and retrieval. The physical mode supports
 the actual physical parameters of the drive (2 or 4 heads, 27 sectors
 per track, and 782 cylinders). Translate mode for the WD93024-X
 supports 4 heads, 17 sectors per track, and 615 cylinders. For the
 WD93034 6 heads, 615 cylinders and 17 sectors per track. For the
 WD93044-X supports 5 heads, 17 sectors per track, and 977 cylinders.
 
 Physical or translate mode is invoked via jumper J8 1-2. Physical
 mode provides the optimum usage of disk storage capacity since every
 physical storage sector on the disk is available to the user. How-
 ever, many older operating systems cannot accomodate the storage
 capacity of the intelligent storage peripheral. The translate mode
 accommodates those operating systems which do not recognize 27
 sectors per track (SPT).
 
 
 Preventive Maintenance
 ----------------------
 No preventive maintenance is required for the WD93024-X, WD93034-X,
 and WD93044-X.