
M R 3 3 5    MITSUBISHI
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/HH               Cylinders     743|     |     |
Capacity form/unform    45/   54 MB        Heads           7|     |     |
Seek time   / track  20.0/ 5.0 ms          Sector/track   17|     |     |
Controller           MFM / ST506           Precompensation
Cache/Buffer               KB              Landing Zone      742
Data transfer rate    0.625 MB/S int       Bytes/Sector      512
                      0.625 MB/S ext
Recording method     MFM                            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            2.000|        12.000
       idle               W     Shock        g         2       |     40
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h      30000
                                Warranty Month
Lift/Lock/Park     YES          Certificates                                  

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                        L   A   Y   O   U   T
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MITSUBI. MR335  PRODUCT SPECIFICATION IB-67125-A MARCH 1989

  +---------------------------------------------------------+
  |                                                         |XX
  |                                                         |XX J2
  |                                                         |XX
  |                                                         |XX
  |                                                         |  1
  |                                              SW1 8--+   |XX
  |                                                  |  |   |XX
  |                                                  |  |   |XX
  |                                                  |  |   |XX
  |                                                  1--+   |XX J1
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |  1
  |                                                         |
  |                                             Power   XXXXXX J3
  +---------------------------------------------------------+



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                      J   U   M   P   E   R   S
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MITSUBI. MR335  PRODUCT SPECIFICATION IB-67125-A MARCH 1989

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


 SW1  Drive Select
 -----------------
        +---------------+
        |x o o o x o o o|ON
        |o x x x o x x x|OFF
        +1-2-3-4-5-6-7-8+
         | | | | | | | +---  Set OFF position
         | | | | | | +-----  Set OFF position
         | | | | | +-------  Termination Switch
         | | | | +---------  RADIAL (R)
         | | | +-----------  Drive Select 4 (DS4)
         | | +-------------  Drive Select 3 (DS3)
         | +---------------  Drive Select 2 (DS2)
         +-----------------  Drive Select 1 (DS1)


 In multiple unit connection it is necessary to configure each drive
 with a unique address.

   +-----------+---------------------------+
   |   SW2     |Drive Select Configuration |
   +----+------+------+-----+----+---------+
   |Bit |*Mark |   1  |  2  |  3 |  4      |
   +----+------+------+-----+----+---------+
   | 1  | DS1  |  ON  | OFF |OFF |OFF      |
   +----+------+------+-----+----+---------+
   | 2  | DS2  |  OFF | ON  |OFF |OFF      |
   +----+------+------+-----+----+---------+
   | 3  | DS3  |  OFF | OFF |ON  |OFF      |
   +----+------+------+-----+----+---------+
   | 4  | DS4  |  OFF | OFF |OFF |ON       |
   +----+------+------+-----+----+---------+
  *Mark is printed on Printed Circuit Board (PCB).


 Radial option
 -------------
 On leaving the factory, the switch marked "R" of SW1 is set in the
 ON position ... lever up and the transfer of control signals to and
 from the drive is enabled only when the address of DRIVE SELECT 1, 2,
 3, or 4 matches the drive address (daisy-chain operation) defined by
 the drive select signal from the controller.

 When this switch is in the OFF position ... lever down, the transfer
 of control signals is enabled regardless of the DRIVE SELECT signal
 (radial operation).

 When the "R" option is used, the "Drive Selected" indicator lamp on
 the front of the drive does not light. To make this lamp light, a
 DRIVE SELECT signal shall be applied.


 Terminators
 -----------
 To provide termination for the last unit, termination switch of SW1
 should be set in the ON position. On all other units, the termination
 switch of SW1 should be set in the OFF position.


 J3   DC Power and pin connector assignments
 -------------------------------------------
     +--------------+
     |+-----J3-----+|  pin 1    +12 VDC
     || 1  2  3  4 ||  pin 2    +12 VDC Return
     |+------------+|  pin 3    + 5 VDC Return
     +--------------+  pin 4    + 5 VDC



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MITSUBI. MR335  PRODUCT SPECIFICATION IB-67125-A MARCH 1989

 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
      UNACCEPTABLE!                                UNACCEPTABLE!

 When installing the drive in its final location, particular attention
 must be paid to the following points.

 1. Adequate ventilation must be provided to allow any
    heat generated to dissipate.
    Cooling air is recommended for 6 cfm.

 2. Adequate disk enclosure swing space (minimum 2mm) must be
    provided.

 3. Serviceability

 4. The drive must be installed so oas to put no under strain on the
    units frame.


 J1/P1 Connector - Control Signals
 ---------------------------------
 Connection to J1 is via a 34 pin PCB edge connector. The pins are
 numbered 1 through 34 with the even pins located on the component
 side of the circuit board and the odd numbers on the soldered side.
 There is a key slot between pins 4 and 6.

 Mating Connector 3M ribbon connector P/N 3463-0001 or equivalent


 J2/P2 Connector - Data Signals
 ------------------------------
 Connection to J2 is via a 20 pin PCB edge connector. The pins are
 numbered 1 through 20 with the even pins located on the component
 side of the circuit board. There is key slot between pins 4 and 6.

 Mating Connector 3M ribbon connetor P/N 3461-0001 or equivalent


 J3/P3 Connector - DC Power
 --------------------------
 The connector J3 is a DC-power connector. With this drive, a P/N
 350211-1 AMP Mate-N-Lock connector (or equivalent) is mounted.

 Mating Connector AMP P/N 1-480424-0 (housing)
 Utilizing Contacts AMP P/N 61473-1 (pin connector)


 Frame Ground Connector
 ----------------------
 With this drive, the DC ground for the PCB and the disk enclosure are
 connected. The ground connector for this drive is a AMP P/N 61761-2
 (or equivalent). The recommended mating connector is AMP P/N 62187-1.


 Multiple Unit Connection (Case of 4 Drives)
 -------------------------------------------
       HOST
   +-----------+                                +-----------------+
   |           +---o---Control------------------+J1     Drive 1   |
   |           |   |    +-------Data------------+J2               |
   |           |   |    |     +---------Power---+J3  FG    ...    |
   |           |   |    |     |                 +-----+-----------+
   |           |   |    |     |            +-Frame-GND+
   |           |   |    |     |            |    +-----------------+
   |Controller |   o----+-----+--Control---+----+J1     Drive 2   |
   |           |   |    | +---+------------+----+J2               |
   |           |   |    | |   |  +-Power---+----+J3  FG    ...    |
   |           |   |    | |   |  |         |    +----+------------+
   |           |   |    | |   |  |         o---------+
   +-----------+   |    | |   |  |         |    +-----------------+
   +-----------+   o----+-+---+--+-Control-+----+J1     Drive 3   |
   |           |   |    | | +-+--+---------+----+J2               |
   |           +---+----+ | | |  |  +-Power+----+J3  FG    ...    |
   |           +---+-Data-+ | |  |  |      |    +-----+-----------+
   |           |   |        | |  |  |      o----------+
   |Data       +---+-Data---+ |  |  |      |    +-----------------+
   |Separator  |   +--Control-+--+--+------+----+J1     Drive 4   |
   |           +-Data---------+--+--+------+----+J2               |
   |           |              |  |  | +-Pow+er--+J3  FG    XXX    |
   +-----------+              |  |  | |    |    +-----+-----------+
                              |  |  | |    o----------+
                  DC       + -+  |  | |    |
                  voltages-+ ----+  | |    |
                  (RADIAL)-+ -------+ |    |
                           + ---------+    |
                  Frame GND  --------------+

 ... = Termination switch OFF

 XXX = Termination switch ON


 Shipping Zone
 -------------
 The drive is designed with a dedicated parking/shipping zone. When
 the power is removed from the drive the heads are automatically
 parked and locked in the parking/shipping zone.



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                      F   E   A   T   U   R   E  S
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MITSUBI. MR335  PRODUCT SPECIFICATION IB-67125-A MARCH 1989


 Features
 --------
 This highly-reliable fixed disk drive contain 3.5" fixed disks. The
 MR335 series provides large capacity and high speed, up to 54.1MB and
 a seek time of 20 ms, in a small compact drive. The series employs
 many aspects of "Winchester" technology such as the disk, head,
 shield enclosure and a clean air circulation system. To achieve
 accurate positioning a servo system controlled by a microprocessor is
 is utilized.


 Seek Time
 ---------
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |   5    |
       +----------------------------------+--------+
       |Average                msec. typ. |  20    |
       |                       msec. max. |  40    |
       +----------------------------------+--------+
       |Latency                msec. avg. |   8.33 |
       +----------------------------------+--------+


 Air Filtration
 --------------
 Elimination rate of better than 99.97% for dust particles of greater
 than 0.3 m. Effects of changes in altitude, atmospheric pressure, and
 temperature are eliminated by using a breather filter. Maintenance of
 the main filter is unnecessary.


 Positioning method
 ------------------
 Voice coil motor positioning using a dedicated servo platter.


 Media defects
 -------------
 Less than 10 in a disk surface
 Less than 1 in 1 MBytes of the Drive
 No defects on Zero cylinder


