
3 2 4 3   A V    SINGAPORE
                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/HH               Cylinders    4097|     |     |
Capacity form/unform  4351/ 5071 MB        Heads          19|     |     |
Seek time   / track   8.5/ 1.5 ms          Sector/track     |     |     |
Controller           SCSI2 SI/FAST/AV      Precompensation
Cache/Buffer           512 KB SEGMENTED    Landing Zone
Data transfer rate          MB/S int       Bytes/Sector      512
                     10.000 MB/S ext SYNC
Recording method     RLL                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 50    |    -40 65
Power: sleep              W     Humidity     %        10 90    |     10 95
       standby            W     Altitude    km    -0.061  3.048| -0.305 15.240
       idle          14.0 W     Shock        g         5       |     60
       seek          17.0 W     Rotation   RPM      7200
       read/write         W     Acoustic   dBA        37
       spin-up            W     ECC        Bit   126,REED SOLOMON
                                MTBF         h
                                Warranty Month
Lift/Lock/Park     YES          Certificates     AV PERFORMANCE ENHAN,ISO9000


**********************************************************************
                        L   A   Y   O   U   T
**********************************************************************
MICROPL. 3243 CAPRICORN  PRELIMINARY PRODUCT DESCRIPTION 138008 REV. 1

  +---------------------------------------------------------+
  |                                              W2         |XX
  |                                          W1+-+          |XX
  |                                          W3| |          |XX
  |                                          W4+-+          |XX
  |                                                         |XX J1
  |                                            +-+ID0       |XX
  |                                            | |ID1       |XX
 ++ LED                                        | |ID2       |XX
 ++                                            +-+RESERVED  |XX
  XX 27                                                     |XX
  XX                                                        |XX
  XX                                                        |XX
  XX Option Jumper                                          |XX
  XX Block                                                  |XX1
  XX                                    COMPONENT SIDE      |XX
  XX                                    NO. 138032          |XX J1A
  | 1                                                       |XX
  +---------------------------------------------------------+  1



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
MICROPL. 3243 CAPRICORN  PRELIMINARY PRODUCT DESCRIPTION 138008 REV. 1

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

 x = Factory default


 Option Jumper Block
 -------------------

             +--+--+--+--+--+--+--+--+--+--+--+--+--+--+
  LED+-+   - |27|25|23|21|19|17|15|13|11|09|07|05|03|01|
  ---+-+-----+  |  |  |  |  |  |  |  |  |  |  |  |  |  +-------
           + |28|26|24|22|20|18|16|14|12|10|08|06|04|02|
             ++-++-++-++-++-++-++-++-++-++-++-++-++-++-+
   RESERVED --+  |  |  |  |  |  |  |  |  |  |  |  |  +-- Remote LED
   Key 2 NC -----+  |  |  |  |  |  |  |  |  |  |  +----- ID0
      SSYNC --------+  |  |  |  |  |  |  |  |  +-------- ID1
      MSYNC -----------+  |  |  |  |  |  |  +----------- ID2
   Key 1 NC --------------+  |  |  |  |  +-------------- RESERVED
        PTY -----------------+  |  |  +----------------- SP0
         WP --------------------+  +-------------------- SP1


 Option Jumper Block Pin Assignments
 -----------------------------------
 +---+---------------+---+--------------+
 |Pin| Signal Name   |Pin|Signal Name   |
 +---+---------------+---+--------------+
 | 1 |Remote LED     | 2 |Remote LED +5V|
 +---+---------------+---+--------------+
 | 3 |GROUND         | 4 |ID0           |
 +---+---------------+---+--------------+
 | 5 |GROUND         | 6 |ID1           |
 +---+---------------+---+--------------+
 | 7 |GROUND         | 8 |ID2           |
 +---+---------------+---+--------------+
 | 9 |GROUND         |10 |RESERVED      |
 +---+---------------+---+--------------+
 |11 |GROUND         |12 |SP0           |
 +---+---------------+---+--------------+
 |13 |GROUND         |14 |SP1           |
 +---+---------------+---+--------------+
 |15 |GROUND         |16 |WP            |
 +---+---------------+---+--------------+
 |17 |GROUND         |18 |PTY           |
 +---+---------------+---+--------------+
 |19 |N/C            |20 |KEY 1         |
 +---+---------------+---+--------------+
 |21 |GROUND         |22 |MSYNC         |
 +---+---------------+---+--------------+
 |23 |GROUND         |24 |SSYNC         |
 +---+---------------+---+--------------+
 |25 |N/C            |26 |KEY 2         |
 +---+---------------+---+--------------+
 |27 |RESERVED       |28 |RESERVED      |
 +---+---------------+---+--------------+


 Single-Ended Configuration Options
 ----------------------------------

 SCSI ID
 -------
 NOTE:
 There are two identical groups of address jumpers on the Device
 Electronics board; use either group for address selection but not
 both at the same time.

   +----------+-----------------------+ Up to eight devices (the host
   | SCSI ID  |        Jumpers        | and seven targets) can be
   |          | ID2   | ID1   | ID0   | attached to the SCSI Bus.
   +----------+-------+-------+-------+
   |    0     | OPEN  | OPEN  | OPEN  | ID jumpers ID0, ID1 and ID2
   |    1     | OPEN  | OPEN  | CLOSED| are used to assign one of
   |    2     | OPEN  | CLOSED| OPEN  | eight SCSI ID bits (0-7) to
   |    3     | OPEN  | CLOSED| CLOSED| the drive.
   |    4     | CLOSED| OPEN  | OPEN  |
   |    5     | CLOSED| OPEN  | CLOSED| In multiple-device systems,
   |    6     | CLOSED| CLOSED| OPEN  | each drive must have its own
   | x  7     | CLOSED| CLOSED| CLOSED| unique ID.
   +----------+-------+-------+-------+


 SP0/SP1  Spindle Control Option
 -------------------------------
    SP0 CLOSED
    SP1 OPEN   Spindle motor starts when START UNIT command is
               received.

    SP0 OPEN   (default)
    SP1 OPEN   Spindle motor starts at power-on.


 SP0/SP1  Spindle Delay Option
 -----------------------------
    SP1 CLOSED
    SP0 OPEN   Spindle start-up is delayed based on SCSI ID (12
               seconds per ID).

    SP1 OPEN   (default)
    SP0 OPEN   Spindle motor starts at power on.


 WP  Write Protect Option
 ------------------------
    WP CLOSED  Drive is write protected.
    WP OPEN    Drive is not write protected. (default)


 PTY  Bus Parity Check Option
 ----------------------------
    PTY CLOSED  Drive neither generates nor detects parity.
        OPEN    Drive generates parity and has parity detection
                enabled. (default)


 W1/W2/W3  Bus Termination Power Option
 --------------------------------------
     +-----+  +-----+  +-----+  +-----+
    W1 xxx |  | o X W2 | o o |  | o o |
     | o o |  | o x |  | xxx W3 | o o |
     | o o |  | o o |  | o o |  | xxx W4
     +-----+  +-----+  +-----+  +-----+

 W1  CLOSED (default)
     Drive provides terminator power.

 W2  CLOSED
     Host system provides terminator power (via J1 pin 26).

 W3  CLOSED
     Drive provides terminator power (via J1, pin 26) to the BUS.


 W4 Interface Termination
 ------------------------
   W4  INSTALLED  Drive is not terminated
  x    OMITTED    Drive is terminated.


 Spindle Synchronization
 -----------------------
 The Rotational Position Locking field (MODE SELECT command, Page Code
 04h) is used to specify spindle synchronization operation.

 Unsynchronized: If the drive is set to Unsynchronized (RPL = 00b), it
 ignores the SLAVE SYNC signal.

 Slave: If the drive is set to Slave (RPL = 01b), it does not generate
 the MASTER SYNC signal or the SLAVE SYNC signal but synchronizes its
 index to the SLAVE SYNC signal supplied by an external source.

 Master: If the drive is set to Master (RPL = 10b), it generates the
 SLAVE SYNC output signal for use directly by the slave drives.

 Master Control: If the drive is set to Master Control (RPL = 11b), it
 generates the MASTER SYNC signal. This output is used by the
 controller to generate the SLAVE SYNC signal for the slaves.



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                      I   N   S   T   A   L   L
**********************************************************************
MICROPL. 3243 CAPRICORN  PRELIMINARY PRODUCT DESCRIPTION 138008 REV. 1

 Notes on installation
 =====================

 Recommended mounting orientation
 --------------------------------

            horizontally             vertically
         +-----------------+   +--+             +--+
         |                 |   |  +-----+ +-----+  |
         |                 |   |  |     | |     |  |
       +-+-----------------+-+ |  |     | |     |  |
       +---------------------+ |  |     | |     |  |
                               |  |     | |     |  |
                               |  |     | |     |  |
                               |  +-----+ +-----+  |
                               +--+             +--+

 Dimensions and Mounting
 -----------------------
 The drive uses industry-standard mounting For 3 1/2-inch full-height
 Winchester disk drives.

 Recommended orientation is vertical on either side, or horizontal
 with the Device Electronics board down; other mounting orientations
 may be used.

 No matter what mounting orientation is used, Micropolis specifies
 that the maximum HDA casting temperature not exceed 60*C (140*F).


 Mounting Screws
 ---------------
 3 per side 6-32 UNC-2B
 4 on bottom 6-32 UNC-2B

 Caution: The mounting screws must be selected so that they do not
 penetrate the bottom mounting holes by more than 0.20 inches or the
 side mounting holes by more than 0.156 inches.

 Screws that are too long will short to PCBA.


 SINGLE-ENDED Interface Electrical Characteristics
 -------------------------------------------------
 Interface control and status signals are digital (open collector TTL)
 using industry-standard transmitters and receivers which provide
 a terminated, single-ended system.

 For active termination, the assigned signals are terminated with 110
 ohms to +2.85V (nominal). For passive termination, the assigned
 signals are terminated with 220 ohms to +5V (nominal) and 330 ohms to
 ground. All signals use open-collector or tri-state drivers.

 Single-ended drivers and receivers allow a maximum cable length of
 six meters (primarily for connection within a cabinet).

 Signal transmission requires a single 50-conductor (flat or
 twisted-pair) cable. A characteristic impedance of 100 ( 10%) ohms
 is recommended.

  a. Input Characteristics

     Each of the drive's signal receivers has the following
     characteristics when measured at the interface connector.

   1) Low-level input voltage = (Signal true) 0.0 VDC to 0.8 VDC

   2) High-level input voltage = (Signal false) 2.0 VDC to 5.25 VDC

   3) Low-level input current = -0.4 milliamps at 0.5 VDC

   4) High-level input current = 0.1 milliamps at 2.7 VDC

   5) Minimum input hysteresis = 0.2 VDC

   6) Maximum input capacitance = 25 pF


  b. Output Characteristics

     Each driven signal has the following characteristics when
     measured at the interface connector.

   1) Low-level input voltage = 0.0 VDC to 0.5 VDC (signal assertion)

   2) High-level input voltage = 2.5 VDC to 5.25 VDC (signal negation)

   3) Minimum driver output capability = 48 milliamps (sink) at 0.5VDC


  c. Terminator Power (TERMPWR at Pin 26)

     Terminator Power has the following requirements:

   V(TERM) = 4.25 VDC to 5.25 VDC

   800 milliamps minimum source drive capability, with 1.0 amp
   recommended current limiting (e.g., a fuse).

   1.0-milliamp maximum bus loading (except for the purposes of
   providing power to an internal terminator).

 Keyed connectors are provided to prevent accidental grounding or
 misconnection of terminator power.


 Signal Connector J1
 -------------------
 J1 is a 50-pin connector. The signals on J1 include the 8-bit SCSI
 bus and various control and handshaking lines.

 Recommended Cable: 3M Scotchflex 3365/50 or equivalent.
 Mating connector:  3M P/N 3425-3000 or equivalent.


 J1A Power Connector
 -------------------
 J1A is a 4-pin connector used to supply +5V and +12V to the drive.

 Recommended mating connector: AMP 1-480424-0 or equivalent
 Pins: AMP 350078-4
 Suggested wire size: 18 AWG (minimum) for all pins.

  pin 1    +12 VDC
  pin 2    +12 Volts Return
  pin 3    + 5 Volts Return
  pin 4    + 5 VDC


 2-pin Connectors (Remote LED, Spindle Sync, etc.)
 -------------------------------------------------
 Recommended mating connectors: Dupont 69305-002 or equivalent
 Pins: Dupont 77138-001
 Suggested wire size: 26-30 AWG for all pins


 SCSI ID Connector (6-pin)
 -------------------------
 Recommended mating connector: Dupont 90311-006 or equivalent
 Pins: Dupont 77138-001
 Suggested wire size: 26-30 AWG for all pins


 Multiple-Drive Systems
 ----------------------
                                             Drive #1
  +------HOST------+                 +-----------------+
  | +-----------+  +--+-SCSI-BUS-----+ J1              |
  | |Terminators|  |  |       +------+ J1A             |
  | +-----------+  |  |       |      +-----------------+
  |                |  |       |
  +----------------+  |       |              Drive #2
                      |       |      +-----------------+
                      +-------+------+ J1              |
                      |       o------+ J1A             |
                      |       |      +-----------------+
                      |       |
                      |       |              Drive #3
                      |       |      +-----------------+
                      +-------+------+ J1              |
                      |       o------+ J1A             |
                      |       |      +-----------------+
                      |       |
                      |       |              Drive #4
                      |       |      +--------------+--+
                      +-------+------+ J1           |T |
                              o------+ J1A          +--+
           ---DC-VOLTAGES-----+      +-----------------+

 T = TERMINATORS

 Terminators are installed ONLY in the last physical drive in the
 control chain.


 Temperature Measurement
 -----------------------
 Micropolis specifies the maximum HDA casting temperature to be 60*C
 (140*F). Not exceeding this temperature will ensure that the head-to-
 media interface never exceeds its temperature limit.

 If the HDA casting temperature measurement cannot be made, the
 ambient air temperature around the drive must be kept at or below
 50*C (122*F).



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
MICROPL. 3243 CAPRICORN  PRELIMINARY PRODUCT DESCRIPTION 138008 REV. 1


 Description
 -----------
 This Product Description describes the Micropolis model 3243 (8-bit,
 single-ended) Rigid Disk Drive. The drive is a member of the
 CAPRICORN family of high-performance, 3 1/2-inch, full-height Rigid
 Disk Drives.

 These drive provides OEMs with random-access, high-speed, data
 storage and meet the needs of diverse applications environments.

 The drive is compatible with the "ANSI CCS" version and the "SCSI-2"
 version of the industry-standard Small Computer System Interface
 (SCSI) specification.


 3243 AV
 -------
 The 3243 is available in an AV version. AV drives are specifically
 designed for enhanced digital audio and video performance in
 applications such as multi-media, desktop publishing, digital video
 editing, and video servers. AV drives provide:

 - Predictable, sustained data rates, allowing reduction in size of
   system buffers needed thereby reducing system cost.

 - Fast command processing for reduced overhead.

 - Advanced cache management for improved overall performance.

 - Fast ECC which ensures maximum data integrity without interrupting
   the data stream.


 DIFFERENTIAL INTERFACE IS OPTIONAL.

 Some Features of the Drive
 --------------------------
 - Positive media protection is achieved during spin down (due to a
   STOP UNIT command or power off) by automatically retracting and
   locking the positioner in a data-free landing zone.

 - N-Segment Read-Ahead algorithm improves read performance by
   allowing many accesses to be serviced from the cache buffer (512K
   or optional 2MB).

 - Optional, Write-Behind Caching provides dramatic improvement in
   write performance by appending multiple write commands per disk
   revolution.

 - In-Line Defect Management (sector slipping) provides maximum
   throughput.

 - Data Integrity is ensured with CRC through the buffer, 126-bit
   Reed-Solomon ECC on-the-fly, and automatic retries using servo and
   data strobe offsets.


 Media Defects
 -------------
 Media defects are physical characteristics of the media which result
 in repetitive read errors when a functional drive is operated within
 specified operating conditions.

 At the time of manufacture, a media test system evaluates every
 drive and identifies each media defect location. The defective
 areas are identified by head address (HD), cylinder address (CYL),
 and number of clocks from Index (CFI).

 The list of manufacturer-found defects is stored on the drive in a
 reserved, write-protected area accessible by the SCSI controller.
 This list is known as the MDL (Manufacturers Defect List) or PList
 (Primary Defect List).

 A printed listing of the defects is also shipped with each drive. The
 entries it contains can be mapped out (reassigned) automatically at
 format control parameter bits.


 Seek Time
 ---------

                                          | 3243   |
        ----------------------------------+--------+
        Track-to-Track  read   msec. typ. |   1    |
                        write  msec. typ. |   2    |
                       Average msec. typ. |   8.5  |
                               msec. max. |  20    |
        Latency                msec. avg. |   4.17 |
        ----------------------------------+--------+


 Recording Media
 ---------------
 Aluminium disks, each 95 millimeters (3 1/2 inches) in diameter, are
 mounted on the spindle assembly. The recording surface on each disk
 is a thin coating of magnetic material, with a carbon over-coat to
 protect that surface.


 Air Filtration System
 ---------------------
 The drives are designed to provide contamination control within the
 HDA throughout the life of the drive with zero maintenance.

 Air within the HDA is continuously recirculated and filtered through
 a high efficiency filter. Air is ducted to and from the filter for
 maximum pressure recovery and filter efficiency. Air within the HDA
 may only enter the drive through a high-efficiency breather filter.


 Braking
 -------
 The heads contact an area of the disk surface which is not used for
 data storage when the disk are not spinning and during start and
 stop cycles. Dynamic braking is used to stop the spindle quickly.


 Adjustments and Maintenance
 ---------------------------
 The drive requires no adjustments or periodic maintenance;
 additionally, no mechanical adjustments are required to prepare a
 system for handling or shipment.


 Field-Replaceable Components
 ----------------------------
 The concept of repair by replacement of complete functional
 components is utilized in the drive, resulting in an MTTR of less
 than 15 minutes.


 MICROPOLIS AV SERIES
 --------------------
 Micropolis AV Series disk drives are engineered specifically for
 multi-media, high-end graphics, and digital video/audio applications.
 With advanced cache management, internal housekeeping improvements,
 and enhanced error handling, AV drives provide the highest minimum
 sustained data rate in their class. AV drives are designed to provide
 a maximum sustained uninterrupted data rate. Unlike data processing
 drives, AV drives guarantee a "worst case" data rate performance.
 This means that with the buffer empty, the maximum access time
 (including error handling) is no more than 30 milliseconds.



**********************************************************************
                      G   E   N   E   R   A   L
**********************************************************************
MICROPOL. AV LT

 What is an AV Drive?
 --------------------
 Today's demanding digital video and audio applications require disk
 drives to sustain a pre-determined minimum data transfer rate.
 Any interruptions in this data rate are detrimental to AV
 applications that require constant delivery of data at 30 frames per
 second minimum. In standard drives utilized for data processing
 requirements, the error correction and thermal calibration methods
 employed are not optimized for continuous delivery of data. These
 routine housekeeping tasks will procedure gaps in the data stream as
 long as 850 ms, resulting in jumps, gaps, and stutters in motion and
 sound when used in most AV applications.

 (MICROPOLIS 10/96)


 Installation Guide for IBM PC & Compatible
 ==========================================

 Daisy Chain Option Kit
 ----------------------
 The MICRODISK AV LT subsystem will normally be last SCSI device on
 the daisy chain. However, if you wish to daisy chain your MICRODISK
 AV LT subsystem to other SCSI devices, you will need one Daisy Chain
 Option Kit. This kit includes one each of the following items:

 - SCSI System Cable (right angle connector)
 - Daisy Chain (DCO) SCSI Backplane Cable
 - MHA Rear Cover

 Two SCSI system cables are available. Both cables have a Centronics
 50-pin connector at the MICRODISK AV LT end, and either a Centronics
 50-pin or mini-SCSI connector at the other end.

 NOTE
 Connect the SCSI system cable's right angle connector to the back of
 the module.


 Using the Daisy Chain Option Kit
 --------------------------------
 The MICRODISK AV LT subsystem will normally be the last SCSI device
 on the daisy chain. However, if you wish to daisy chain your MICRO-
 DISK AV LT subsystem to other SCSI devices, you will need one Daisy
 Chain Option Kit.

 To allow your MICRODISK AV LT subsystem to daisy chain to other SCSI
 devices, you will remove the SCSI Backplane Cable from a MICRODISK AV
 LT module (usually the TOP module in the stack), and replace it with
 a Daisy Chain SCSI Backplane Cable. You will then install the MHA
 rear cover, and connect the rightangle connector end of the SCSI
 system cable to the Daisy Chain SCSI Backplane Cable connector, and
 the other end (50-pin Centronics connector) to another SCSI device
 outside the MICRODISK AV LT subsystem.


 Installation Guide for IBM PC & Compatible
 ==========================================

 Cables/Cords
 ------------
 MICRODISK AV LT SCSI cables and AC power cords are manufactured to
 the industry standard for this type of application. MICRODISK AV LT
 module interconnect cables and cords have specific design features to
 maintain both aesthetics and uncompromising performance.

 Failure of any single power cord or SCSI cable will not cause data to
 be lost. Failure of a single cord or cable may sometimes cause all
 disk drive access to cease, but should never cause data stored on a
 MICRODISK AV LT drive to be lost.


 Getting Started
 ---------------
 There are several kits that may be shipped for assembly and installa-
 tion of a MICRODISK AV LT subsystem. The minimum MICRODISK AV LT
 subsystem requires at least:

 - One MICRODISK AV LT Module Kit.
 - One MICRODISK AV LT System Configuration Kit.
 - One SCSI/Power Cable Kit.
 - One SCSI host adapter.

 Depending on the configuration you may also need:

 - Additional SCSI host adapters.
 - One or more MICRODISK AV LT Module Kit(s).
 - One or Expansion Kit(s).
 - One or more MICRODISK AV LT Multiple Host Adapter (MHA) Option
   Kit(s) .
 - One or more MICRODISK AV LT Daisy Chain Option Kit(s).

 CAUTION
 Do not twist cable or cord connectors during unpacking or assembly;
 damage may occur.


 MICRODISK AV LT Module Kit
 --------------------------
 A MICRODISK AV LT Module Kit includes one each of the following
 items:

 - MICRODISK AV LT Module
 - Front Cover
 - Rear Cover
 - Hardware Registration Card
 - Read First Document

 To increase available storage capacity, modules may be assembled in a
 "stack".

 If you use more than nine modules in your MICRODISK AV LT subsystem,
 new stacks should be created to accommodate the additional modules.

 NOTE
 The maximum recommended number of modules in each stack is nine.

 Only seven SCSI devices can be connected to a single host adapter
 If you have more than seven modules in your stack, you must install a
 second host adapter and use a Multiple Host Adapter (MHA) Option Kit.

 If you create more than one stack, you will need one Expansion Kit
 and one SCSI/Power Cable Kit for each additional stack you create.


 System Configuration Kit
 ------------------------
 MICRODISK AV LT subsystems are assembled with the components included
 in the MICRODISK AV LT System Configuration Kit, Module Kit(s), and
 SCSI/Power Cable Kits. One System Configuration Kit is required per
 MICRODISK AV LT subsystem.

 The MICRODISK AV LT System Configuration Kit includes one each of the
 following items:

 - Top Cover
 - SCSI Terminator
 - Base Assembly (with Power Switch)
 - Read First Document
 - Assembly and Installation Guide.


 SCSI/Power Cable Kit
 --------------------
 One SCSI/Power Cable Kit is needed per stack. There are six types of
 cable kits to address the Centronics SCSI Connector (ISA) or mini-
 SCSI Connector (EISA/MCA) and three types of AC Power Cords
 available: U.S., U.K., or European:

 - U.S. Standard SCSI/Power Cable Kit
 - U.S. Mini-SCSI/Power Cable Kit
 - U.K. Standard SCSI/Power Cable Kit
 - U.K. Mini-SCSI/Power Cable Kit
 - European Standard SCSI/Power Cable Kit
 - European Mini-SCSI/Power Cable Kit

 Each type of SCSI/Power Cable Kit includes one each of the following
 items:

 - SCSI System Cable (Centronics SCSI)
 - AC Power Cord


 Expansion Kit
 -------------
 One Expansion Kit is necessary for every new stack you create.

 An Expansion Kit includes one each of the following items:

 - Top Cover
 - SCSI Terminator
 - Base Assembly (with Power Switch)


 Multiple Host Adapter Option Kit
 --------------------------------
 One MHA Option Kit, required for each additional host adapter used
 in any single stack, includes one each of the following items:

 - SCSI System Cable (right angle connector)
 - MHA SCSI Backplane Cable
 - SCSI Terminator
 - MHA Rear Cover

 Two SCSI system cables are available. Both cables have a Centronics
 50-pin connector at the MICRODISK AV LT end, and either a Centronics
 50-pin, mini-SCSI, or mini-SCSI connector at the host adapter end.

 NOTE
 Connect the SCSI system cable's right angle connector to the back of
 the module.


 Compatible SCSI Host Adapters
 -----------------------------
 Your computer needs at least one SCSI host adapter in order to
 communicate with modules in a MICRODISK AV LT subsystem. If you need
 a SCSI host adapter or have any questions, please contact your
 dealer. The following is a table showing the recommended MICRODISK AV
 LT compatible SCSI host adapters:
 +----------------+--------------------------------------+
 |                |              Architecture            |
 |Company         |    ISA       |    EISA     |  MCA    |
 +----------------+--------------+-------------+---------+
 |ADAPTEC         |AHA1540B/42B  |AHA1740/42A* |AHA1640* |
 |                |AHA1540C/42C  |             |         |
 +----------------+--------------+-------------+---------+
 |ALWAYS TECH.    |IN2000*       |             |         |
 +----------------+--------------+-------------+---------+
 |BUSTEK/BUSLOGIC |BT540/42      |BT740/42*    |         |
 +----------------+--------------+-------------+---------+
 |DPT             |PM2011        |PM2012B/90   |         |
 |                |              |PM2012B/95   |         |
 +----------------+--------------+-------------+---------+
 |DTC             |DTC3180A/3280A|DTC3190      |         |
 |                |              |DTC3290      |         |
 +----------------+--------------+-------------+---------+
 |FUTURE DOMAIN   |TMC1660*      |             |         |
 |                |TMC1670*      |             |         |
 |                |TMC1680*      |             |         |
 +----------------+--------------+-------------+---------+
 |MYLEX           |              |DCE376*      |         |
 +----------------+--------------+-------------+---------+
 |ULTRASTOR       |ULTRA14F*     |ULTRA24F*    |         |
 +----------------+--------------+-------------+---------+

 * These host adapters do not accept the standard 50-pin SCSI
   connector cable. Please contact your reseller to obtain the
   appropriate cable if you have one of these host adapters.


 Host Adapter Considerations
 ---------------------------
 - One MHA Option Kit is required for each additional host adapter you
   add to an existing stack.

 - When installing host adapters, ensure that there are no port
   address or IRQ conflicts with other cards already installed or
   planned for installation. Refer to your host adapter documentation
   for specific details.


 MICRODISK AV LT Assembly
 ------------------------
 A MICRODISK AV LT subsystem may be as small as one module, or you can
 add modules to increase storage capacity and create multiple stacks
 if you so desire.

 The minimum MICRODISK AV LT configuration requires on MICRODISK AV LT
 Module Kit, one System Configuration Kit, one SCSI cable, one power
 cord, and one SCSI host adapter.


 Terminator
 ----------
 The terminator must installed in the last module in the chain for
 each SCSI bus (Host Adapter).


 MICRODISK AV LT Series Disk Drives
 ----------------------------------
 Each module in a MICRODISK AV LT subsystem contains a MICRODISK AV LT
 Series disk drive. MICRODISK AV LT Series disk drives are engineered
 specifically for multimediam high-end graphics, and digital audio/
 video applications.

 MICRODISK AV LT Series disk drives have the highest minimum sustained
 data rate in the industry in their class at 3.0 MB/sec, and a maximum
 sustained uninterrupted data rate of 2.9 MB/sec. Industry standard
 high capacity data processing drives are not designed for high
 sustained, uninterrupted data rates - factors which are required for
 real-time recording and playback of digital audio/video data.
 Standard drives perform short, random "burst" transfers, leaving gaps
 in the data stream.


 MICRODISK AV LT Formatting/Partitioning
 ---------------------------------------
 Your MICRODISK AV LT subsystem modules need to be formatted and
 partitioned before they can be used for data storage. To perform
 these functions, use the disk formatting/partitioning utility
 program(s) that you received as part of your operating system
 software.
 The utilities prepare your MICRODISK AV LT modules for use. Under
 normal circumstances you will only need to format and partition each
 MICRODISK AV LT module once.

 NOTE
 Because each module in a MICRODISK AV LT stack is a separate,
 independent SCSI device, you must format and partition each MICRODISK
 AV LT module separately.


 Formatting the Hard Disk
 ------------------------
 Formatting lays down distinct patterns on the disk which set up the
 disk's organizational structure. You normally need to format the disk
 only once.


 Installing Partitions
 ---------------------
 Partitioning prepares a hard disk for use by the PC. Partitions allow
 you to divide the space available on the hard disk into separate
 areas which appear on the desktop as separate logical disk drives
 (volumes). This allows more flexible management of files (i.e., you
 can use one partition for word processing, another for database work,
 etc.).

 Management of back-up also becomes easier with a wellorganized and
 partitioned hard disk. A large hard disk with many small files takes
 up a lot of disk space because of the way the filing system allocates
 disk space. You can save space by partitioning the hard disk into
 smaller volumes.

 Carefully plan your partitions, as you cannot change partitions with-
 out erasing your data. If you choose to alter the sizes or types of
 partitions, you should:

 1. Back up all your files
 2. Make partitioning changes
 3. Restore the files to their new volumes.

 CAUTION
 Remember, you can change partitions later, but all the information
 stored on them will be lost. Make sure you have all data from these
 partitions backed-up before changing the partitions.

 It is not necessary to reformat the disk to redefine the partitions.


 MICRODISK AV LT Operation
 -------------------------
 The MICRODISK AV LT subsystem MUST be turned on prior to, or at the
 same time as, your computer.

 The MICRODISK AV LT subsystem MUST be turned on whenever your
 computer is on.


