
M 2 6 9 4 E H B    FUJITSU
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/HH               Cylinders    1819|     |     |
Capacity form/unform  1148/ 1261 MB        Heads          15|     |     |
Seek time   / track  10.0/ 2.5 ms          Sector/track     |     |     |
Controller           SCSI2 DIFFERENTIAL    Precompensation
Cache/Buffer           512 KB FIFO BUFFER  Landing Zone
Data transfer rate    5.120 MB/S int       Bytes/Sector     1024
                     10.000 MB/S ext SYNC
Recording method     RLL 1/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 45    |    -40 60
Power: sleep              W     Humidity     %        20 80    |      5 95
       standby            W     Altitude    km            3.000|        12.000
       idle               W     Shock        g         5       |     50
       seek          14.0 W     Rotation   RPM      5400
       read/write         W     Acoustic   dBA        43
       spin-up            W     ECC        Bit   64
                                MTBF         h     300000
                                Warranty Month
Lift/Lock/Park     YES          Certificates


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                        L   A   Y   O   U   T
**********************************************************************
FUJITSU  M2691/2692/2693/2694-ES/ESA/ESB/EH/EHA/EHB 41FH5084E/5072E-IM

   Single-Ended type SCSI (M269xES)
  +---------------------------------------------------------+
  |      1+-+2 CNH5                 CNH10 1+-+2         +--+|XX SCSI
  |      3+-+4                            5+-+6         |  ||XX
  |                                          SCSI       |  ||XX C
  |         CNH11  +---+                     Terminating|  ||XX O
  |        9+--+1  |   |                     Resistor   +--*|XX N CN1
  |       10+--+2  |   |                  1 5              1|XX N
  |                +---SW1               +++++              |XX E
  |                              1+-+2   +---CN6            |XX C
  |                              3+-+4                      |XX T
  |  1+-CN7                  CNH2                           |XX O
  |  3+-+                                                   |XX R
  |1+---+CN5                                                |XX
  |2+---+                                                   |XX
  |                                                         |  1
  |                                                         |XX Power
  |                                                         |XX CN1
  |                                                         |XX
  +---------------------------------------------------------+  1





   Differential Type SCSI (M269xEH)
  +---------------------------------------------------------+
  |      1+-+2 CNH5                       1+-+2 CNH10       |XX SCSI
  |      3+-+4                            5+-+6             |XX
  |                                                         |XX C
  |         CNH11  +---+                                    |XX O
  |        9+--+1  |   |                                    |XX N CN1
  |       10+--+2  |   |                                    |XX N
  |                +---SW1                                  |XX E
  |                              1+-+2 CNH2                 |XX C
  |                              3+-+4                      |XX T
  |  1+-CN7                                                 |XX O
  |  3+-+                                                   |XX R
  |1+---+CN5                                                |XX
  |2+---+                                                   |XX
  |                                                         |  1
  |                                                    +---+|XX Power
  |                                                  CN6++++|XX CN1
  |                                                     5 1 |XX
  +---------------------------------------------------------+  1



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
FUJITSU  M2691/2692/2693/2694-ES/ESA/ESB/EH/EHA/EHB OEM MAN.41FH5084E-

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

 x =  Jumper set at factory

 The user must set the following terminals and SCSI terminating
 resistor before installing the IDD in the system.

  - Setting terminal: SW1, CNH10, CNH11, CNH2, CNH3
  - SCSI terminating resistor (M269xES only)

 Notes:
 1. The user must not change the setting of terminals not described in
    this section. Do not change setting statuses set at factory ship-
    ment.

 2. Do not change the setting of terminals except SW1 (offline self-
    diagnostics)/CNH11(write protect) or do not connect or disconnect
    the SCSI terminating resistor module (M269xES only) when power is
    turning on.

 3. To short the setting terminal, use the short plug attached when
    the device is shipped from the factory.


 SW1  Switch setting
 -------------------

    +-1-2-3-4-5-6-7-8-+ON
 SW1| x x x x x x x x |
    +-+-+-+-+-+-+-+-+-+OFF
      | | | | | | | +------ Motor start mode
      | | | | | | +-------- LED display requirement
      | | | | | +---------- Synchronous mode transfer request
      | | | | +------------ SCSI bus parity
      | | | +-------------- Reselection retry count
      | | +---------------- UNIT ATTENTION report mode
      | +------------------ Offline self-diagnostics
      +-------------------- SCSI level


 SW1-1  SCSI level setting
 -------------------------
   +-------+------------------------------------+---------+---------+
   |       |  INQUIRY data                      |         |         |
   |       +----------+-----------+-------------+         |         |
   | Mode  |Byte 2,   |Byte 3,    | Byte 7      | INQUIRY |  SW1-1  |
   |       |bits 2 to |bits 3 to 0| (Provided   | VPD     |         |
   |       |0 (ANSI   |(Response  | function)   | informa-|         |
   |       |version)  |data format|             | tion    |         |
   +-------+----------+-----------+-------------+---------+---------+
   | SCSI-2| '0,1,0'  | '0,0,1,0' |Indicates    | Valid   |         |
 x | mode  |(SCSI-2)  | (SCSI-2)  |the function |         |  OFF    |
   |       |          |           |of the IDD   |         |         |
   |       |          |           |for each bit.|         |         |
   +-------+----------+-----------+-------------+---------+---------+
   |       | '0,0,1,' |'0,0,0,1'  |             |         |         |
   | SCSI-1|ANSIX3.131|ANSIX3T9.2/|All bits '0' | Invalid |  ON     |
   | CSS   |1986      |85-52      |             |         |         |
   | mode  |(SCSI-1)  |(CCS)      |             |         |         |
   +-------+----------+-----------+-------------+---------+---------+

 1. Set the display contents of data posted to the initiator from the
    IDD with the INQUIRY command according to SW1-2. Select one of the
    modes depending on the system software requirements.

 2. When the SCSI-1/CCS mode is selected, parameters transferred by
    the MODE SENSE command as follows.

     a. Page code 3F (all pages equipped in the IDD are transferred)

         1  Page 7, page 8 and page A are not transferred
         2  Page 1, page 2 and page 4 are transferred with the
            specified length of CCS.

     b. When page 1, page 2 or page 4 is specified individually, it is
        transferred with the specified length of CCS.

     c. When page 7, page 8 or page A is specified individuelly, it is
        transferred with the specified length of SCSI-2.

     d. For the recovery parameter of the VERIFY, the recovery para-
        meter in page 1 is used.

 3. When SCSI-1/CSS mode is selected and the REQUEST SENSE command is
    issued with specifying the transfer byte length to 0, the IDD
    transfers the 4-byte sense data.


 SW1-2  Offline self-diagnostics
 -------------------------------
   No.2
    ON   Executed (diagnostic mode)
 x  OFF  Stopped (normal operation mode)

 Set starting/stopping the IDD offline self-diagnostics. The offline
 self-diagnostics tests the IDD controller functions and the basic
 read/write operation of the disk drive. In normal operations, this
 setting terminal must be OFF.


 SW1-3  UNIT ATTENTION report mode setting
 -----------------------------------------
   No.3
 x  ON   For a command other than INQUIRY, REQUEST SENSE, or PRIORITY
         RESERVE the IDD responsed with the CHECK CONDITION status.
         (SCSI standard)
    OFF  All received commands are executed normally. (The CHECK
         CONDITION status caused by the UNIT ATTENTION condition is
         not reported.)

 Sets the response method against the received command when the IDD
 keeps the UNIT ATTENTION condition. This mode is set for system
 requirement, however, it is recommended to use the SCSI standard
 setting (setting at factory shipment).


 SW1-4  Reselection retry
 ------------------------
   No.4
 x  ON   Retry count of RESELECTION phase =   (unlimited)
    OFF  Retry count of RESELECTION phase = 10


 SW1-5  SCSI bus parity setting
 ------------------------------
   No.5
 x  ON   SCSI data bus parity check by the IDD Executed
    OFF  SCSI data bus parity check by the IDD not Executed


 SW1-6  Synchronous mode transfer request setting
 ------------------------------------------------
   No.6
 x  ON   Synchronous mode transfer enabled
    OFF  Synchronous mode transfer disabled

 Set wether synchronous mode data transfer request from the TARG is
 enabled according to Table. When the synchronous mode data transfer
 is enabled, the IDD responds the SYNCHRONOUS DATA TRANSFER REQUEST
 message to the INIT that issues the first command after power-on.

 Notes:
 1. This setting does not affect asynchronous mode transfer.

 2. When synchronous mode transfer request is disabled, the IDD
    operates as follows.

    - When the SYNCHRONOUS DATA TRANSFER REQUEST message is sent from
      the INIT, the IDD reply to that message and the DATA IN and the
      DATA OUT phases of the SCSI bus can be executed in synchronous
      mode.

    - The IDD does not send the SYNCHRONOUS DATA TRANSFER REQUEST
      message to the INIT.

 3. The maximum data transfer rate in synchronous mode is determined
    when the SYNCHRONOUS DATA TRANSFER REQUEST message is exchanged
    between the IDD and INIT.

    The INIT must determine the parameter sent to the IDD when the
    message is exchanged in consideration of the signal transfer
    characteristics of the system SCSI bus and the data reception
    capacity of the INIT.

    The IDD can transfer up to 10 MB/s in synchronous mode. However,
    since the configuration of the SCSI bus and its transfer
    characteristics differ depending on the system, the maximum
    transfer rate in which data can be transferred in a stable condi-
    tion must be determined for each system.

 4. For reference, the IDD data transfer rate in synchronous mode and
    the restrictions on the systems configuration of the SCSI bus are
    shown below.

 Remarks: The following values are rough standards. The values be
 evaluated for each system.
  +--------------------+--------------------+-----------------------+
  | Max. transfer rate |  Max. length of    |  Number of connectable|
  | of the IDD (MB/s)  |  the SCSI cable (m)|  SCSI devices         |
  +--------------------+--------------------+-----------------------+
  |     3 to 10        |         *          |       *               |
  +--------------------+--------------------+-----------------------+
  |   2.67 or less     |     6(M269xES),    |                       |
  |                    |    25(M269xEH)     |       8               |
  +--------------------+--------------------+-----------------------+

 * The maximum SCSI cable length and the number of connectable SCSI
   devices must be determined for each system.


 SW1-7  LED display requirement setting
 --------------------------------------
   No.7
 x  ON   Light when the IDD operates
    OFF  Light when the IDD is ready

 Set the display requirements of the LED on the fron panel or external
 operator.


 SW1-8  Motor start mode setting
 -------------------------------
   No.8
 x  ON   The motor is started immediately after power is turned on.
    OFF  Starting the motor is controlled with the START/STOP command.

 This setting only determines the operation mode when power is turned
 on. Stopping or restarting the spindle motor can be controlled with
 the START/STOP UNIT command for both modes.


 CNH2  User Setting Inhibited
 ----------------------------
        +2-4+
        |o o|CNH2
        |o o|
        +1-3+
         +-+---- User setting inhibited (OPEN); (Factory test)


 CNH10 Power supply to SCSI terminating resistor on IDD (M269xES)
 ----------------------------------------------------------------
                                          (Single-Ended only)
        +2-4-6+
        |x x x|CNH10
        |X X X|
        +1-3-5+
         | | +-- SCSI terminating resistor
         | |     power (M269xES only)
         | +---- SCSI teminator resistor
         |       power
         +------ User setting inhibited

   +-------------------------------------------------+------+------+
   |SCSI terminating resistor power supply           | 5-6  | 3-4  |
   +-------------------------------------------------+------+------+
   |Power is supplied to the terminating resistor    |      |      |
 x |from the IDD and TERMPWR pin. Power is supplied  |CLOSED|CLOSED|
   |to the TERMPWR pin from the IDD.                 |      |      |
   +-------------------------------------------------+------+------+
   |The TERMPWR pin is not used. Power is supplied   |      |      |
   |to the IDD terminating resistor only from the    |OPEN  |CLOSED|
   |IDD.                                             |      |      |
   +-------------------------------------------------+------+------+
   |Power is not supplied to the terminating resistor|      |      |
   |from the IDD. Power is supplied to the IDD       |CLOSED|OPEN  |
   |terminating resistor only from the TERMPWR pin.  |      |      |
   +-------------------------------------------------+------+------+

 Note: When the IDD connects to a position other than both ends of the
 SCSI cable, do not mount the terminator resistor module on the IDD.

       +-----------------------------------------------------+
       |                     +------ CNH10 ----+   -+- +5V DC|
      +++                    | 5  6     4    3 |    |        |
        | TERMPWR +------+   +-+--+-----+----+-+    + Diode  |
      S *---------+ FUSE +-----+  |     |    +------+        |
      C |26       +------+        +-----+----+               |
      S |                             +------+-----+         |
      I *-----------------------------+ Terminator |         |
        | SIGNAL             Mounted  | resistor   |         |
      +++  +----+            in socket+------+-----+         |
       |   +----+IDD                         + GND           |
       +-----------------------------------------------------+


 CNH10  Power supply terminal resistor circuit on SCSI (M269xEH)
 ---------------------------------------------------------------
                                          (Differential type)
   +--------------------------------------------------+------+
   |SCSI terminating resistor power supply            | 3-4  |
   +--------------------------------------------------+------+
 x |Power is supplied from the IDD                    |CLOSED|
   +--------------------------------------------------+------+
   |Power is supplied from TERMPWR pin only (IDD power|OPEN  |
   |supply is not used.                               |      |
   +--------------------------------------------------+------+


       +-----------------------------------------------------+
       |                     + CNH10+              -+- +5V DC|
      +++                    | 4  3 |               |        |
        | TERMPWR            +-+--+-+               + Diode  |
      S *----------------------+  |   +------+      |        |
      C |25                    |  +---+ Fuse +------+        |
      S |26                    |      +------+               |
      I *----------------------+                             |
        | TERMPWR                                            |
      +++ +---+                                              |
       |  +---+ IDD                                          |
       +-----------------------------------------------------+


 CNH11  Setting terminals
 ------------------------
    +-2-4-6-8-10+
    | x x x x o |
    | X X X X o |
    +-1-3-5-7-9-+
      | | | | +-- User setting inhibited
      | | | +---- Write Protect
      +-+-+------ SCSI ID

 CNH11  SCSI ID
 --------------

   +----------+-----------------------+
   | SCSI ID  |        Jumpers        |
   |          | ID2   | ID1   | ID0   |
   +----------+-------+-------+-------+
   |x   0     | OPEN  | OPEN  | OPEN  |
   |    1     | OPEN  | OPEN  | CLOSED|
   |    2     | OPEN  | CLOSED| OPEN  |
   |    3     | OPEN  | CLOSED| CLOSED|
   |    4     | CLOSED| OPEN  | OPEN  |
   |    5     | CLOSED| OPEN  | CLOSED|
   |    6     | CLOSED| CLOSED| OPEN  |
   |    7     | CLOSED| CLOSED| CLOSED|
   +----------+-------+-------+-------+

 Notes: Set the SCSI ID so that there are no duplicates between SCSI
 devices on the same SCSI bus.

 The priority of SCSI bus use in ARBITRATION phase is determined by
 SCSI ID as follows:  7 > 6 > 5 > 4 > 3 > 2 > 1 > 0


 CNH11  Write Protect
 --------------------
   7-8  OPEN   Write operation is inhibited
 x      CLOSED Write operation is enabled

 Enabling or disabling write protect function is set by pin 7-8 of the
 setting terminal CNH11. By setting this write protect function,
 writing into disk medium is inhibited.


 CN1  DC Power and pin connector assignments
 -------------------------------------------
 -------------------+
 --+  +----CN1-----+|  pin 1    +12 VDC
  1|  | 4  3  2  1 ||  pin 2    +12 Volts Return (GND)
  -+  +------------+|  pin 3    + 5 Volts Return (GND)
  ------------------+  pin 4    + 5 VDC


 CN5   External operator panel connector
 ---------------------------------------

       Pin number    Signal
       --------------------
          01        LED (V)
          02        -LED


 CN6   External operator panel connector
 ---------------------------------------
 When the external operator panel is not connected to CN6, CN6 should
 be opened. (default setting: OPEN)
 When the external operator panel is connected, pins of CNH11 corres-
 ponding to the signals set by the external operator panel should be
 opened.

       Pin number  Signal   Pin number  Signal
       ---------------------------------------
          01         GND      02         -ID2
          03         GND      04         -ID1
          05         GND      06         -ID0


 CN7   Spindle Sync Connector
 ----------------------------

       Pin number  Signal   Pin number  Signal
       ---------------------------------------
          01       GND IN     02        SS IN
          03       GND OUT    04        SS OUT



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                      I   N   S   T   A   L   L
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FUJITSU  M2691/2692/2693/2694-ES/ESA/ESB/EH/EHA/EHB OEM MAN. 41FH5084E

 Installation direction
 ----------------------

     horizontally                           vertically
   +-----------------+           +--+                      +--+
   |                 |           |  +-----+          +-----+  |
   |                 |           |  |     |          |     |  |
 +-+-----------------+-+         |  |     |          |     |  |
 +---------------------+         |  |     |          |     |  |
                                 |  |     |          |     |  |
      x           x              |  |     |          |     |  |
 +------x------x-------+         |  +-----+          +-----+  |
 +-+------x--x-------+-+         +--+                      +--+
   |       xx        |
   |     x    x      |
   +---x--------x----+
     x            x

 The permissible orientations of the IDD are shown above, and the
 tolerance of the angle is   5* from the horizontal plane.


 Mounting frame structure
 ------------------------
 The disk enclosure (DE) of the IDD serves as a signal ground (SG) and
 is insulated from the mounting frame (frame ground: FG). As this
 insulation is maintained after the IDD is mounted in the system, the
 following precautions must be followed.

 Generally, SG an FG are connected at one point in the system
 enclosure. Therefore, use following procedure to maintain the
 insulation when mounting the IDD:

 a) Use the frame with an embossed structure or the like to avoid
    contact between the DE base and FG. Mount the IDD with making a
    gap of 2.5 mm or more between the IDD and the frame of the system.

 b) The inward projection of the screw from the IDD frame wall at the
    corner must be 4 mm or less.

 Limitatation of side-mounting: When the drive is mounted using side
 screw holes, do not use the center hole. (M3 or #6-32 UNC screws)


 External magnetic field
 -----------------------
 The drive should not be installed near the ferromagnetic body like a
 speaker to avoid the influence of the external magnetic field.


 Ambient temperature
 -------------------
 When the IDD is operating, the ambient temperature measured 3 cm from
 the disk enclosure (DE) surface and from the PCA surface must satisfy
 the specified requirement. For the DE surface temperature at opera-
 ting, the contact temperature at the measurement point must satisfy
 the specified requirement.


 Sequential starting of spindle motors
 -------------------------------------
 After the power is turned on to the IDD, a large amount of current
 flows in the +12 V DC line when the spindle motor rotation starts.
 Therefore, if more than one IDD is used, the spindle motors should
 be started sequentially using one of the following procedures to pre-
 vent overload of the power supply unit.

 a. Issue START/STOP UNIT commands at 20-second intervals to start
    the spindle motors.

 b. Turn on the +12 V DC power in the power supply unit at 20-second
    intervals to start the spindle motors sequentially.


 Noise filter
 ------------
 To eliminate AC line noise, a noise filter should be installed at the
 AC input terminal on the IDD power supply unit. The specification of
 this noise filter is as follows:

       Attenuation:          40 dB or more at 10 MHz.
       Circuit construction: T-configuration is recommended.


 SCSI cable
 ----------
 All SCSI devices on one bus are daisy-chained with an SCSI cable.
 A terminating resistor must be mounted in the SCSI device at each end
 of the SCSI cable.

 Since an SCSI terminating resistor module is mounted in the only IDD
 of Single-Ended type SCSI on shipment, it must be removed when the
 IDD is not connected at either end of the SCSI cable. Also, a method
 for power supply to the terminating resistor must be selected with
 the setting terminal on the IDD.

 The maximum number of SCSI devices that can be connected to the SCSI
 bus is 8, including the host adapter, IDD, and other SCSI equipment.

 The connector (socket) for the SCSI cable must be an unshielded 50-
 contact socket which has two rows of 25 contacts spaced at 2.54 mm
 (0.1 inch) apart. It should also have a key way to prevent insertion
 in the wrong direction (bump type connector).

 The maximum length of the SCSI cable is as follows. If more than one
 SCSI device is connected, the total cable length must not exceed the
 following.

         6m cable length     Single-Ended type SCSI (M269xES)
        25m cable length     Differential type SCSI (M269xEH)

 The use of a 25-pair twisted cable satisfying the following require-
 ments is recommended:

        Conductor size: 28 American Wire Gauge (AWG) or bigger

        Characteristic Impedance: 90 to 132

 Each pair of wires in the 25-pair twisted cable must be connected to
 pins n and n+1 (where n is an odd number) on the interface connector.
 Cables having an identical impedance must be use on the same SCSI bus
 to reduce signal reflection and maintain transmission characteristics

 When an SCSI device is connected to the SCSI cable except at either
 end of the cable, connection to the SCSI connector must be at a
 branchpoint of the cable. If a SCSI device is connected to one end of
 the SCSI bus, no cable should be connected after the last SCSI device
 except when the cable has a terminating resistor.


 Power cable
 -----------
 IDDs must be star-connected to the DC power sypply (one to one con-
 nection) to reduce the influence of load variations.


 DC ground
 ---------
 A DC ground cable may or may not be installed depending on the
 system requirements (system installation environment, cabinet
 structure, power supply system). This cable is generally connected
 to the ground of the power supply unit. It is recommended to connect
 with a daisy chain (one by one connection).


 Connector for external operator panel
 -------------------------------------
 Two types of connectors for the external operator panel are provided
 on the IDD. They allow connection of an external LED on the front
 panel, and an SCSI ID setting switch.


 SCSI terminating resistor (M269xES only)
 ----------------------------------------
 The SCSI terminating resistor module is installed in the only IDD
 of Single-Ended type SCSI (M269xES) when the IDD is shipped from the
 factory. The terminating resistor module is mounted in a socket and
 must be processed in one of followings.

 1. When conecting the IDD to either end of the SCSI cable, do not
    demount the terminating resistor module.

 2. When connecting the IDD to a position other than both ends of the
    SCSI cable, demount terminating resistor module.

 Notes:
 When demounting the terminating resistor module, be careful not to
 damage the resistor module pins, mount socket and contiguous parts.

 When mounting the terminating resistor module, check the mounting
 direction and wether the module is fixed.

      +- Marker shows pin 1            +- Marker shows pin 1
      |                                |
      |  +-----------------+           |
      |  |* * * * * * * * *|           |  +*-*-*-*-*-*-*-*-*+
      +- *                 |           +- * Resistor        |
         |* * * * * * * * *|              +*-*-*-*-*-*-*-*-*+
         +-----------------+
         Socket, terminating resistor
         module not present


 Confirming initial operations
 -----------------------------

 Initial operation in the case of settong so that motor starts at
 powering-on.

    1. When power is turned on, the LED blinks an instant and the IDD
       executes initial self-diagnosis.

    2. If an error is detected in the initial self-diagnosis, the LED
       on the front panel blinks periodically.

 Remark: The spindle motor may or may not start rotating in this stage

    3. When the LED display requirements are set to "the IDD is
       ready", the LED on the front panel lights 15 seconds after
       power is turned on.

    4. When the LED display requirements are set to "the IDD operates"
       the LED on the front panel remains off (when the initiator
       accesses the IDD via the SCSI bus, the LED lights).


 2. Initial operation in the case of setting so that motor starts
    with START/STOP command.

    1. When power is turned on, the LED blinks an instant and the IDD
       executes initial self-diagnosis.

    2. If an error is detected in the initial self-diagnosis, the LED
       on the front panel blinks.

    3. The spindle motor does not start rotation until the START/STOP
       UNIT command for the start is issued. The INIT needs to issue
       the START/STOP UNIT command to start the spindle motor.

    4. The disk drive enters the READY status 15 seconds after the
       START/STOP UNIT command is issued. At this time, the IDD reads
       "system information" from the system space on the disk.

    5. When the LED display requirements are set to "the IDD is
       ready", the LED on the front panel ligths as in step 4.

    6. When the LED display requirements are set to "the IDD operates"
       the LED blinks during command execution.

 3. Check items at illegal operation

    * Check that cables are mounted correctly.

    * Check that power and voltages are supplied correctly.

    * Check the setting of each jumper setting terminal. The initial
      operation depends on the setting of the motor start mode and LED
      display requirements.

    * If an error is detected in initial self-diagnosis, the LED on
      the front panel blinks. In this case, it is recommended to issue
      the REQUEST SENSE command from the initiator (host system) to
      obtain information (sense data) for error analysis.

    When the LED display requirements are set to "the IDD is ready",
    the LED is turned off while the drive continues command execution.
    However, since the LED is turned off for only one blink, the LED
    may seem to be turned on and off or not turned off at all.

    When the LED display requirements are set to "the IDD operates",
    the LED lights during the IDD is executing a command. However,
    in some commands the lighting time is only an instant.
    Therefore, it seems that the LED blinks or the LED remains off.

    Since the IDD has the automatic readjustment function of positi-
    oning (seek) control, it automatically executes the adjustment
    operations with seek at specific intervals from power on (first
    adjustment: 5 minutes after power on). The seek sound is heard
    during the adjustment but this does not indicate a drive error.


 Dismounting drives
 ------------------
 Take the drive offline.

 Disconnect system power before removing the drive. Do not remove
 mounting screws holding the cables and drive while power is on.

 Do not move the drive until it completely stops (30 seconds after
 spindle motor is stopped with START/STOP UNIT command or after
 power is turned off).



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
FUJITSU  M2691/2692/2693/2694-ES/ESA/ESB/EH/EHA/EHB OEM MAN.41FH5084E-

 Media defects
 -------------
 The number of allowable media defects are as follows.

       M2691E  :  378 and less
       M2692E  :  462 and less
       M2693E  :  546 and less
       M2694E  :  630 and less


 Error recovery
 --------------
 The IDD can try to recover from errors in SCSI bus or the disk drive
 using its powerful retry processing. If a recoverable data check
 occurs, error-free data can be transferred to the initiator after
 being corrected in the data buffer. The initiator software is
 released from the complicated error recover processing by these error
 recovery functions of the IDD.


 ECC
 ---
 It is a 8-byte error detection/correction code for the data field.
 It is possible to detect single burst errors with length of up to
 44 bits or double burst errors with length of up to 10 bits and to
 correct single burst errors with lengths of up to 8 bits.


 Defect List
 -----------
 Information of the defect location on the disk is managed by the
 defect list. The following are defect lists which the IDD manages.

 P list (Primary defect list): This list consists of defect location
 information available at the disk drive shipment and is recorded in
 a system space. The defects in this list are permanent, so that the
 INIT must execute the alternate block allocation using this list
 when initializing the disk.

 D list (Data defect list): This list consits of defect location
 information specified in a FORMAT UNIT command by the INIT at the
 initialization of the disk. This information is recorded in the
 system space of the disk drive as G list. To execute the alternate
 block allocation, the FORMAT UNIT command must be specified.

 C list (Certification defect list): This list consist of location
 information on defective blocks which are detected by the verifying
 operation (certification) of the data block after the initiation
 when executing the FORMAT UNIT command. The IDD generates this
 information when executing the FORMAT UNIT command, and the alternate
 block allocation is made upon the defective block. This information
 is recorded in the system space of the disk drive as the G list.

 G list (Growth defect list): This list consists of defective logical
 data block location information specified in a REASSIGN BLOCKS
 command by the INIT, information on defective logical data blocks
 assigned alternate blocks by means of IDD automatic alternate block
 allocation, information specified as the D list, and information
 generated as the C list. They are recorded in the system space on the
 disk drive.

 The INIT can read out the contents of the P and G lists by the
 READ DEFECT DATA command.


 Programmable data block length
 ------------------------------
 Data can be accessed with fixed block length unit. Data block length
 is programmable, and can be set to the most suitable length, from
 180 to 4,160 bytes with 2-byte boundary at formatting time.


 High speed data transfer
 ------------------------
 The data transfer rate on the SCSI bus is 4MB/s maximum in asynchro-
 nous mode and 10MB/s in synchronous mode. Such a high data transfer
 rate on the SCSI bus can be useful with the large capacity buffer
 in the IDD.

 The maximum data transfer rate in asynchronous mode may be limited
 by the response time of the initiator and the length of SCSI bus
 length.

 The maximum data transfer in synchronous mode on the single-ended
 SCSI bus may be limited by the cable length and transmission charac-
 teristics of the SCSI bus and the connected SCSI device number.


 512KB programmable multi-segment data buffer
 --------------------------------------------
 Data is transfered between SCSI bus and disk media through the em-
 bedded 512KB data buffer in the IDD. This buffer can be divided into
 maximum 32 areas. This feature provides the suitable usage
 environment for users.

 Since the initiator can control the disconnect/reconnect timing on
 the SCSI bus by specifying the condition of stored data in the data
 buffer or empty condition of the data buffer, the initiator can per-
 form the effective input/output operations with utilizing high data
 transfer capability of the SCSI bus regardless of actual data trans-
 fer rate of the disk drive.


 Read-Ahead cache feature
 ------------------------
 After executing the READ command, the IDD reads automatically and
 stores (prefetches) the subsequent data blocks into the data buffer
 (Read-Ahead caching).

 The high speed sequential data access can be achieved by transfering
 the data from the data buffer without reaccessing the disk in case
 the subsequent command requests the prefetched data blocks.


 Command queuing feature
 -----------------------
 The IDD can queue maximum 128 commands, and optimize the issuing
 order of queued commands by the reordering function. This feature
 realizes the high speed processing.


 SCSI bus configuration
 ----------------------
 Up to eight SCSI devices can be connected to the SCSI bus, with any
 combination of the SCSI devices that operate as initiator and that
 operate as target.

 Each SCSI device on the bus has its own unique address (SCSI-ID: #n).
 For input/output operation, a peripheral device attached to the SCSI
 bus that operates as target is addressed in unit called as logical
 unit. A unique address (LUN: logical unit number) is assigned for
 each logical unit.

 The initiator selects one SCSI device by specifying that SCSI ID,
 then specifies the LUN to select the peripheral device for input/
 output operation.

 The IDD is constructed so that the whole volume of disk drive is a
 single logical unit, the selectable numbers of SCSI ID and LUN are as
 follows:
                     SCSI ID:  Selectable from 0 to 7
                               (switch selectable)
                     LUN:      0 (fixed)


 Mean Time Between Failures (MTBF)
 ---------------------------------
 MTBF of the IDD during its life time is 300.000 hours.

               Operating time (hours) at all field sites
        MTBF = -----------------------------------------------------
               The number of equipment failures from all field sites

 Failure of the equipment means failure that requires repair, adjust-
 ments or replacement. Mishandling by the operator, failures due to
 bad environmental conditions, power trouble, host system trouble,
 cable failures, or other failures not caused by the equipment are not
 considered.


 Mean Time To Repair (MTTR)
 --------------------------
 MTTR is the average time taken by a well-trined service mechanic to
 diagnose and repair a drive malfunction. The drive is designed for a
 MTTR of 30 minutes or less.


 Service life
 ------------
 Overhaul of the drive is not required for following period which ever
 earlier if handled correctly.

 - DE surface temperature: 48*C or less......5 years
 - DE surface temperature: 48*C and more.....5 years or
                                             20,000 power-on hours


 Data security at power failure
 ------------------------------
 Integrity of the data on the disk is guaranteed against all forms of
 DC power failure except on blocks where a write operation was being
 performed. The above does not applied to formatting disks or assign-
 ing alternate blocks.


 DISCLAIMER
 ----------
 Failure of the intelligent disk drives is defined as a failure
 requiring adjustments, repairs or replacement. Fujitsu is not
 responsible for drive failures caused by misuse by the user, poor
 environmental conditions, power trouble, host problems, cable fai-
 lures, or any failures not caused by the drive itself.


 Track format configuration example
 ----------------------------------

         Sectors/track
        +-------------------+----+----+----+----+----+----+
        |Data block length  | 180| 256| 512|1024|2048|4096|
        +-------------------+----+----+----+----+----+----+
        |Zone           I   | 225| 172|  96|  51|  26|  13|
        +-------------------+----+----+----+----+----+----+
        |Zone          II   | 213| 163|  91|  48|  25|  12|
        +-------------------+----+----+----+----+----+----+
        |Zone         III   | 199| 153|  85|  45|  23|  11|
        +-------------------+----+----+----+----+----+----+
        |Zone          IV   | 187| 143|  80|  42|  22|  11|
        +-------------------+----+----+----+----+----+----+
        |Zone           V   | 175| 134|  75|  40|  20|  10|
        +-------------------+----+----+----+----+----+----+
        |Zone          VI   | 162| 124|  69|  37|  19|   9|
        +-------------------+----+----+----+----+----+----+
        |Zone         VII   | 149| 114|  64|  34|  17|   8|
        +-------------------+----+----+----+----+----+----+
        |Zone        VIII   | 136| 105|  58|  31|  16|   8|
        +-------------------+----+----+----+----+----+----+

        +-------------------+----------+
        |                   |Byte/Sec. |
        +-------------------+----------+
        |Zone           I   |  56889   |
        +-------------------+----------+
        |Zone          II   |  53751   |
        +-------------------+----------+
        |Zone         III   |  50477   |
        +-------------------+----------+
        |Zone          IV   |  47339   |
        +-------------------+----------+
        |Zone           V   |  44201   |
        +-------------------+----------+
        |Zone          VI   |  41064   |
        +-------------------+----------+
        |Zone         VII   |  37789   |
        +-------------------+----------+
        |Zone        VIII   |  34652   |
        +-------------------+----------+



**********************************************************************
                      G   E   N   E   R   A   L
**********************************************************************
FUJITSU => GDT

 Tips & Hints about ICP controllers and other peripherals
 ========================================================

 Tagged queues and Fujitsu M 26xx harddisks
 ------------------------------------------
 Fujitsu Harddisks of the M26XX series do not support the SCSI-II
 feature tagged queues. You should disable this feature in the
 initialize disks menue of the GDTSetup program. An inquiry command
 shows, that the harddisk supports tagged queues (this is why you can
 enable it in the GDTSetup) but this is not true as stated by Fujitsu
 Germany.


