
M 2 6 9 2 H A    FUJITSU
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/HH               Cylinders    1819|     |     |
Capacity form/unform   794/  925 MB        Heads          11|     |     |
Seek time   / track   9.5/ 2.5 ms          Sector/track     |     |     |
Controller           SCSI2 DIFFERENTIAL    Precompensation
Cache/Buffer           256 KB FIFO BUFFER  Landing Zone
Data transfer rate    4.170 MB/S int       Bytes/Sector      512
                     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               W     Rotation   RPM      4400
       read/write    14.0 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-H/HA/HB  OEM MANUAL 41FH5072-01/5072E-IM

  +---------------------------------------------------------+
  |                            2 4   2                      |XX
  |                        CNH2+-+  ++ CNH6                 |XX
  |                            +-+  ++                      |XX I
  |                            1 3   1                      |XX N
  |                                                         |XX T
  |                                                         |XX E
  |                                                         |XX R
  |                                                         |XX F
  |   1+-CN7-+                                              |XX A
  |   3+-----+                                              |XX C
  |                                                         |XX E
  |1+----+                        2    9  2       18        |XX
  |2+-CN5+                        +-----+---------+         |XX
  |                               +CNH7-+--CNH1---+         |
  |                     2  1      1    10 1       17        |xx
  |                CNH3 +--+                           +CN6+|XX Power
  |                     +--+                           +++++|XX CN1
  +---------------------------------------------------------+
  P/N B17B-2060-0100A



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
FUJITSU  M2691/2692/2693/2694-H/HA/HB/S/SA/SB  OEM MANUAL 41FH5072E-01

 Switches loacations
 ===================

 x = Jumpers are set from factory

 The user must set the following terminals and SCSI terminating resis-
 tor before installing the IDD in system:
 CNH1, CNH6, CNH7, CNH3, SCSI terminating resistor (M269xS only)

 The user must not change the setting of terminals not described in
 this section. Do not change setting statuses set at factory shipment.

 Do not change the setting of terminals except CNH1 (offline self
 diagnostics), CNH7 (write protect) or do not connect or disconnect
 the SCSI terminating resistor module when power is turning on.


 CNH1  For factory use only
 --------------------------
        1- 2  User setting inhibited


 CHN1  SCSI level setting
 ------------------------
   +-------+------------------------------------+---------+---------+
   |       |  INQUIRY data                      |         |         |
   |       +----------+-----------+-------------+         |         |
   | Mode  |Byte 2,   |Byte 3,    | Byte 7      | INQUIRY |   3-4   |
   |       |bits 2 to |bits 3 to 0| (Provided   | VPD     |         |
   |       |0 (ANSI   |(Response  | function)   | informa-|         |
   |       |version)  |data format|             | tion    |         |
   +-------+----------+-----------+-------------+---------+---------+
 x | SCSI-2| '0,1,0'  | '0,0,1,0' |Indicates    | Valid   |         |
   | mode  |(SCSI-2)  | (SCSI-2)  |the function |         |  Open   |
   |       |          |           |of the IDD   |         |         |
   |       |          |           |for each bit.|         |         |
   +-------+----------+-----------+-------------+---------+---------+
   |       | '0,0,1,' |'0,0,0,1'  |             |         |         |
   | SCSI-1|ANSIX3.131|ANSIX3T9.2/|All bits '0' | Invalid |  Short  |
   | CSS   |1986      |85-52      |             |         |         |
   | mode  |(SCSI-1)  |(CCS)      |             |         |         |
   +-------+----------+-----------+-------------+---------+---------+

 Set the display contens of data posted to the initiator from the IDD
 with the INQUIRY command according to table.

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

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

         Page 7 and page 8 are not transferred

         Page 1, page 2, page 4 are transferred with the specified
         length of CCS.

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

    When the page 7 or page 8 is specified individually, it is trans-
    ferred with the specified length of SCSI-2.

    For the recovery parameter of the VERIFY, the recovery parameter
    in page 1 is used.

 When the SCSI-1/CCS mode is selected and the REQUEST SENSE command is
 isssued with specifying the transfer byte length to 0, the IDD trans-
 feres the 4-byte sense data.

 Refer to SCSI Logical Specifications Manual for the details of the
 INQUIRY command, MODE SENSE command and REQUEST SENSE command.


 CNH1  Offline self-diagnostics setting
 --------------------------------------
        5-6   Short  Executed (diagnostic mode)
 x            Open   Stopped (normal operation mode)

 Set starting/stopping the IDD offline self-diagnostics according to
 table. The offline self-diagnostics tests the IDD controller func-
 tions and the basic read/write operation on the disk drive. In normal
 operations, this setting terminal must be opened.


 CHN1  UNIT ATTENTION report mode setting
 ----------------------------------------
 x      7-8   Short  For a command other than INQUIRY, REQUEST SENSE,
                     or PRIORITY RESERVE the IDD responsed with the
                     CHECK CONDITION status. (SCSI standard)
              Open   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 commands when the IDD
 keeps the UNIT ATTENTION condition. This mode is set for system
 requirements, however, it is recommended to use the SCSI standard
 setting.


 CHN1  Reselection retry setting
 -------------------------------
 x      9-10  Short    (unlimited)
              Open   10

 Set the retry mode of the RESELECTION phase.


 CNH1  SCSI bus parity setting
 -----------------------------
 x     11-12  Short  Executed
              Open   Not executed

 CNH1  Synchronous mode transfer request setting
 -----------------------------------------------
 x     13-14  Short   Enabled
              Open    Disabled

 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.

 Note: This setting does not affect asynchronous mode transfer.

 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 replys 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.

 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 character-
 istics differ depending on the system, the maximum transfer rate in
 which data can be transferred in a stable condition must be
 determined for each system.

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

 The following values are rough standards. The values must be evalua-
 ted for each system.
   +----------------------+------------------+---------------------+
   |   Maximum transfer   |Maximum length of |Number of connectable|
   |rate of the IDD (MB/s)|the SCSI cable (m)|     SCSI devices    |
   +----------------------+------------------+---------------------+
   |       3 - 10         |        *         |          *          |
   +----------------------+------------------+---------------------+
   |     2.67 or less     |    6  M269xS     |          8          |
   |                      |   25  M269xH     |                     |
   +----------------------+------------------+---------------------+
    * The maximum SCSI cable length and the number of connectable
      SCSI devices must be determined for each system.


 CNH1  LED display requirement setting
 -------------------------------------
 x     15-16  Short   Light when the IDD operates.
              Open    Light when the IDD is ready.


 CNH1  Motor start mode setting
 ------------------------------
 x     17-18  Short   The motor is started immediately after power
                      is turned on.
              Open    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  For testing at factory
 ---------------------- -----
       1-2   Open     User setting inhibited
       3-4   Open     User setting inhibited

 The user must not be change CNH2 and CNH5 setting as factory ship-
 ment (the IDD does not operate correctly when shorted), and must not
 short CNH8.


 CNH6  Power supply to SCSI terminating resistor circuit on IDD
       Single-Ended type (M269xS only)
 ---------------------------------------------------------------
 x      3-4   SHORT   Power is supplied to the terminating resistor
 x      1-2   SHORT   from IDD and TERMPWR pin. Power is supplied
                      to the TERMPWR pin from the IDD.

        3-4   OPEN    TERMPWR pin is not used. Power is supplied to
        1-2   SHORT   the IDD terminating resistor only from IDD.

        3-4   SHORT   Power is not supplied to the terminating
        1-2   OPEN    resistor the IDD. Power is supplied to the IDD
                      terminating resistor only from the TERMPWR pin.

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

       +-----------------------------------------------------+
       |                     +------ CNH6 -----+   -+- +5V DC|
      +++                    | 3  4     2    1 |    |        |
        | TERMPWR +------+   +-+--+-----+----+-+    + Diode  |
      S *---------+ FUSE +-----+  |     |    +------+        |
      C |26       +------+        +-----+----+               |
      S |                             +------+-----+         |
      I *-----------------------------+ Terminator |         |
        | SIGNAL             Mounted  | resistor   |         |
      +++  +----+            in socket+------+-----+         |
       |   +----+IDD                         + GND           |
       +-----------------------------------------------------+


 CNH6  Power supply to terminal resistor circuit on SCSI
       Differential type  (M269xH only)
 ----------------------------------------------------------------
 x       1-2  Short   Power is supplied from the IDD
              Open    Power is supplied from TERMPWR pin only
                      (IDD power supplied is not used)

       +-----------------------------------------------------+
       |                     + CNH6 +              -+- +5V DC|
      +++                    | 2  1 |               |        |
        | TERMPWR            +-+--+-+               + Diode  |
      S *----------------------+  |   +------+      |        |
      C |25                    |  +---+ Fuse +------+        |
      S |26                    |      +------+               |
      I *----------------------+                             |
        | TERMPWR                                            |
      +++ +---+                                              |
       |  +---+ IDD                                          |
       +-----------------------------------------------------+


 CNH7  SCSI ID setting
 ---------------------

       SCSI ID |  5-6  | 3-4  | 1-2
       --------+-------+------+----
 x       0     | Open  |Open  |Open
       --------+-------+------+----
         1     | Open  |Open  |Short
       --------+-------+------+----
         2     | Open  |Short |Open
       --------+-------+------+----
         3     | Open  |Short |Short
       --------+-------+------+----
         4     | Short |Open  |Open
       --------+-------+------+----
         5     | Short |Open  |Short
       --------+-------+------+----
         6     | Short |Short |Open
       --------+-------+------+----
         7     | Short |Short |Short

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

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


 CNH7  Write protect setting
 ---------------------------
       7-8   Open      Write operation is inhibited.
 x           Short     Write operation is enabled.

 By setting this write protect function, writing into disk medium is
 inhibited.

 CNH7  For factory use only
 --------------------------
       9-10  OPEN      User setting inhibited


 CN5   External LED
 ------------------
 The external LED is identical in indication to the LED on the front
 of the IDD. The indication can be changed with a setting terminal.

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


 CN6   External operator panel connector
 ---------------------------------------
 When the external operator panel is connected to CN6, pins of CNH7
 corresponding to signals set by CN6 should be opened.
 When the external operator panel is not connected to CN6, CN6 should
 be opended (default).

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


 CN7  Spindle sync connector
 ---------------------------
       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-H/HA/HB/S/SA/SB  OEM MANUAL 41FH5072E-01

 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.

 Check that the DE (signal ground) does not touch the system cabinet
 chassis (frame ground). There must be a 2.5mm or more space between
 the DE and chassis. Use mounting screws whose length inside the drive
 mounting frame are 4mm or less when the screws are tightened.


 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.

 1. Issue START/STOP UNIT commands at 20-second intervals to start
    the spindle motors.
 2. Turn on the +12 V DC power in the power supply unit at 30-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.

 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 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 (M269xS)
        25m cable length     Differential type SCSI (M269xH)

 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: 100 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 a 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.

 Check that system power is off before connecting or disconnecting
 cables. Do not connect or disconnect cables when power is on.

 Fix the cables so that they do not touch the DE and PCAs, or so that
 the smooth flow of the cooling air in the system cabinet is assured.

 Be careful of the insertion directions of the SCSI connectors. With
 the system in which terminating resistor power is supplied via the
 SCSI cable, if the power is turned on, the overcurrent protection
 fuse of the terminating resistor power supplier may be blown or the
 cable may be burnt if overcurrent protection is not provided.


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


 Signal ground connector
 -----------------------
 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).


 Terminator
 ----------
 All SCSI devices on one bus are daisy-chained with a SCSI cable. A
 terminating resistor must be mounted in the SCSI device at each end
 of the SCSI cable.
 Since a SCSI terminating resistor module is mounted in the IDD on
 shipment, it must be removed when the IDD is not connected at either
 end of the SCSI cable. Also, a method for the power supply to the
 terminating resistor must be selected with the setting terminal on
 the IDD.

 When connecting the IDD to either end of the SCSI cable, do not de-
 mount the terminating resistor module.
 When connecting the IDD to a position other than both ends of the
 SCSI cable, demount terminating resistor modules.

 SCSI cable                   SCSI cable
 ----------++-------+         ----------++-------++-------X TERM
       +---++--+ +-xxx---+          +---++--+ +--++---+
       |       | | TERM  |          |       | |       |
       |       | |       |          |       | |       |
       |  IDD  | |  IDD  |          |  IDD  | |  IDD  |
       +-------+ +-------+          +-------+ +-------+
       Correct M269xS only!         Correct M269xS and M269xH

 SCSI cable                   SCSI cable
 ---------+                   ----------++-------X TERM
       +-xxx---+                    +---++--+
       | TERM  |                    |       |
       |       |                    |       |
       |  IDD  |                    |  IDD  |
       +-------+                    +-------+
       Correct M269xS only!         Correct M269xS and M269xH


                   SCSI cable
                   ----------++-------X TERM
                         +--xxx--+
                         |  TERM |
                         |       |
                         |  IDD  |
                         +-------+
                         INCORRECT!


 SCSI terminating resistor (M269xS only)
 ---------------------------------------
 When removing the terminating resistor module from the socket, 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


 External operator panel connector
 ---------------------------------
 When the external operator panel is not connected to CN6, CN6 should
 be opened. (default setting)

 When the external operator panel is connected, pins of CNH7 corres-
 ponding to the signals set by the external operator panel should be
 opened.

  CN6
 +------+
 | 1   2| ID2
 | 3   4| ID1
 | 5   6| ID0
 +------+


 External LED
 ------------
  CN5
 +---+
 | 1-+--------------------+
 | 2-+---------+<---------+
 +---+   external LED

 The external LED is identical in indication to the LED on the front
 of the IDD. The indication can be changed with a setting terminal.
 Any load other than the external LED should not be connected to the
 LED terminals.


 Confirming initial operations
 -----------------------------
 Do not move the drive when power is turned on!

 1. Initial operation in the case where the jumper is set so that
    motor starts at power-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. The spindle motor may
       or may not start rotating in this stage.
    3. When the LED display requirements are set to "READY status",
       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 where the jumper is removed so that
    motor starts with a 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 requirements are set to "READY status", 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. Items to check if an error occurs.

    * 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 "READY status", 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 "in connection with
    SCSI bus", the LED lights during the IDD is executing a command.
    However, in some commands the lighting time is only an instant.
    Therefore it may seem 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).


 FUJITSU DISK-SUPPORT
 --------------------
 Harddisk parameters for SUN-OS (UNIX)
 +--------+---------+---------+----------+-----+-------+
 |Disk Typ|Data Cyl.|alt. Cyl.|phys. Cyl.|Heads|sec/trk|
 +--------+---------+---------+----------+-----+-------+
 |M2694Sx |  1454   |    2    |   1456   | 16  |   91  |
 +--------+---------+---------+----------+-----+-------+


 Macintosh Version
 -----------------
 Apple does not currently supply suitable formatting and partitioning
 software to support the Fujitsu drive, but there are a number of
 third party software vendors who can supply non-specific driver soft-
 ware that provides these functions, e.g. DiskManager Mac from
 Ontrack, StorWare from Unimac and Silverlining from La Cie.

 In order to use these drives in an Apple Macintosh SE or Macintosh II
 product you must obtain the necessary mounting kit if used
 internally, or a suitable enclosure and power supply if an external
 unit is required.



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
FUJITSU  M2691/2692/2693/2694-H/HA/HB/S/SA/SB  OEM MANUAL 41FH5072E-01

 Media defects
 -------------
 The number of allowable media defects are as follows. The maximum
 defect length is 8 bytes.

 M2691:  378 and less
 M2692:  462 and less
 M2693:  546 and less
 M2694:  630 and less

 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.

 256KB programmable multi-segment data buffer
 --------------------------------------------
 Data is transfered between SCSI bus and disk media through the em-
 bedded 256KB data buffer in the IDD. This buffer can be divided into
 maximum 8 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.

 SCSI command specification
 ---------------------------
 ANSI X3.131 - 1986 and CCS (Rev. 4B)
 Supports a part of SCSI-2 command
 FUJITSU unique command

 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.

 Landing zone
 ------------
 The actuator positions heads on the innermost landing zones over the
 disk and is locked by the mechanical lock when the power is off or
 the spindle motor is stopped.

 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
                     LUN:      0 (fixed)

   +-------------+  +-------------+  SCSI bus +----------+LUN=0
   | Host system +--+Host Adapter +-------+---+ IDD      |(fixed)
   |             |  |  ID #7      |       |   |   ID #0  |
   +-------------+  +-------------+       |   +----------+
                                          |   +----------+LUN=0
                                          +---+ IDD      |(fixed)
                                          |   |   ID #1  |
                                          |   +----------+
                                          |   +------------+
                                          +---+ Controller +--+----+--
                                          |   |   ID #2    | LUN0 LUN1
                                          |   +------------+


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

                         Operating time (hours)
            MTBF = ----------------------------------
                    The number of equipment failures

 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
 ------------

         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|
        +-------------------+----+----+----+----+----+----+

         Zone partition and track capacity
        +-------------------+---------+----------+
        |                   |Cylinder |Byte/track|
        +-------------------+---------+----------+
        |Zone           I   |   0- 399|  56889   |
        +-------------------+---------+----------+
        |Zone          II   | 400- 538|  53751   |
        +-------------------+---------+----------+
        |Zone         III   | 539- 677|  50477   |
        +-------------------+---------+----------+
        |Zone          IV   | 678- 877|  47339   |
        +-------------------+---------+----------+
        |Zone           V   | 878-1059|  44201   |
        +-------------------+---------+----------+
        |Zone          VI   |1060-1424|  41064   |
        +-------------------+---------+----------+
        |Zone         VII   |1425-1632|  37789   |
        +-------------------+---------+----------+
        |Zone        VIII   |1633-1830|  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.


