
M 2 6 5 1 H    FUJITSU
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders    1944|     |     |
Capacity form/unform  1223/ 1568 MB        Heads          16|     |     |
Seek time   / track  11.0/ 2.0 ms          Sector/track  154|     |     |
Controller           SCSI2 DIFFERENTIAL    Precompensation
Cache/Buffer           256 KB LOOK-AHEAD   Landing Zone
Data transfer rate    4.758 MB/S int       Bytes/Sector      256
                      5.000 MB/S ext SYNC
Recording method     RLL 1/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C        10 45    |    -40 60
Power: sleep              W     Humidity     %        20 80    |      5 90
       standby            W     Altitude    km            3.000|        12.000
       idle               W     Shock        g         2       |     20
       seek          43.0 W     Rotation   RPM      5400
       read/write         W     Acoustic   dBA        45
       spin-up            W     ECC        Bit   -
                                MTBF         h     300000
                                Warranty Month
Lift/Lock/Park     YES          Certificates


**********************************************************************
                        L   A   Y   O   U   T
**********************************************************************
FUJITSU  M265XH  OEM MANUAL 41FH5051E-03

 M265xH interface PCA (Revision 02)
 ----------------------------------
 +-----------------------------------------------------------------+
 | +--------------1                   .........................    |
 | +---- CN3 -----+                               CN1              |
 |                                                                 |
 | +------1 +------1 +-----1               +----++----++----+      |
 | +-CNH1-+ +-CNH2-+ +-CNH4+               x----+x----+x----+      |
 |                                          Term. Resistors        |
 |                                                                 |
 |    +-----------+ 1-+     +-----------+ 1-+    +---------+       |
 |    |           | | C     |           | | C    |         |       |
 |    |           | | N     |           | | N    |         |       |
 |    |           | | H     |           | | 5    |         |       |
 |    +-----------+ | 3     +-----------+ +-+    +---------+       |
 |                  +-+                                            |
 | +-----+         +-1                                             |
 | +-CN6-+      CNH6-+        +------1           +-----------------+
 |                         CNH7------+           |  XXXXXXXXXX
 |                                               |  Power CN18
 +-----------------------------------------------+




 M265xH interface PCA (Revision 03-)
 -----------------------------------
 +-----------------------------------------------------------------+
 | +--------------1                  ..........................    |
 | +---- CN3 -----+                               CN1              |
 |                                                                 |
 | +------1 +------1  +----1               +----++----++----+      |
 | +-CNH1-+ +-CNH2-+  +CNH4+               x----+x----+x----+      |
 |                                          Term. Resistors        |
 |                                                                 |
 |    +-----------+         +-----------+        +---------+       |
 |    |           |         |           |        |         |       |
 |    |           |         |           |        |         |       |
 |    |           |         |           |        |         |       |
 |    +-----------+         +-----------+        +---------+       |
 |                                                                 |
 | +-----1    +--1  +------1            +------1                   |
 | +-CN6-+    +--+  +-CNH3-+            +-CNH7-+ +-----------------+
 |            CNH6                       +-----1 |  XXXXXXXXXXXXX
 |                                       +-CN5-+ |  Power  CN18
 +-----------------------------------------------+



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
FUJITSU  M2651/53-S/H, M2652/54-S/H/HD  OEM MANUAL 41FH5051E-03

 Jumper Settings
 ===============

 x = Jumpers are set from factory

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

 Setting terminal:      CN3/CN4 (commonly used with connector for
                        external operator panel)

 Setting terminal:      CNH1, CNH2, CNH4, CNH5 and CNH6.

 Terminating resistor (SCSI)

 The user MUST NOT change the setting of terminals not described in
 this section. Setting of CN3/CN4 can be changed when power is on.
 The following setting is valid after power is turned on again, the
 SCSI bus is reset, or port is disabled and then enabled: SCSI ID

 CNH1  LED display requirement
 -----------------------------
 x      1- 2 CLOSE   Lights when the IDD is connected to the SCSI bus
        1- 2 OPEN    Lights when the disk drive is in seek completion
                     status (READY)


 CNH1  SCSI level
 ----------------
 x      3- 4 CLOSE   SCSI-2
        3- 4 OPEN    SCSI-1/CCS



 CNH1  SDTR Negotiation Select setting
 -------------------------------------
 x      5- 6 CLOSE   SDTR negotiation initiated by IDD
        5- 6 OPEN    SDTR negotiation is not initiated by IDD

 When the jumper is shortes, the TARG begins the Synchronous Data
 Transfer negotiation process.
 When the jumper is open, The TARG waits for the INIT to begin the
 negotiation process by sending the SDTR message first.


 CNH1  SCSI time monitoring
 --------------------------
        RESELECTION phase and ACK signal wait time monitoring

 x      7- 8 CLOSE   Executed
        7- 8 OPEN    Not executed

 To prevent SCSI bus infinite loop due to an operation error, do not
 disable the SCSI time monitoring exept for initiator tests or de-
 bugging. The time monitoring mode is set with another setting
 terminal.

 CNH1  Monitoring mode time
 --------------------------

  +--------------+---------------+----------------+-----+-----+-----+
  |Monitor. time | Monitor. time | Number retries |CNH1 |CNH1 |CNH1 |
  |INFORMATION   | RESELECTION   | RESELECTION    |7-8  |9-10 |11-12|
  +--------------+---------------+----------------+-----+-----+-----+
 x|umlimited     | 250  ms       | 128            |CLOSE|CLOSE|CLOSE|
  +--------------+---------------+----------------+-----+-----+-----+
  |30-60s        | 250  ms       |  10            |CLOSE|CLOSE|OPEN |
  +--------------+---------------+----------------+-----+-----+-----+
  |30-60s        | 250  ms       | unlimited      |CLOSE|OPEN |CLOSE|
  +--------------+---------------+----------------+-----+-----+-----+
  | 1- 2s        |   1.5ms       |  10            |CLOSE|OPEN |OPEN |
  +--------------+---------------+----------------+-----+-----+-----+
  |unlimited     | 393  ms       | -----          |OPEN |-----|-----|
  +--------------+---------------+----------------+-----+-----+-----+

 Set the mode of the ACK signal response wait time monitoring in the
 INFORMATION TRANSFER phase, the RESELECTION phase, and number of
 retries.


 CNH1  SCSI bus parity
 ---------------------
 x     13-14 CLOSE   SCSI data bus parity check by the IDD executed
       13-14 OPEN    Not executed


 CNH2  UNIT ATTENTION report mode
 -----------------------------
 x      1- 2 CLOSE   For a command other than INQUIRY, REQUEST SENSE,
                     or PRIORITY RESERVE the IDD responds with the
                     CHECK (SCSI standard).
        1- 2 OPEN    All received commands are executed normally.
                     (The CHECK CONDITION status caused by the UNIT
                     ATTENTION condition is not reported.)

 IDD response under the UNIT ATTENTION condition.
 Sets the response method against the received command when the IDD
 keeps the UNIT ATTENTION conditions. This mode is set for system re-
 quirement, and it is recommended that the factory setting be used.

 CNH2  Spindle sync
 ------------------
     +----------------------------------------+-----+-----+
     |Spindle sync setting                    | 5-6 | 7-8 |
     +----------------------------------------+-----+-----+
 x   |Spindel Sync mode determined by Mode    |CLOSE|CLOSE|
     |Select parameter                        |     |     |
     |Spindle Sync is determined by Mode      |CLOSE|OPEN |
     |Select parameter                        |     |     |
     |Master mode                             |OPEN |CLOSE|
     |Slave mode                              |OPEN |OPEN |
     +----------------------------------------+-----+-----+

 In multiple drive configurations, as in array configuration, SCSI
 data synchronization is required. By using the connector CN6 between
 the drives and setting the required terminals on CNH2, multiple drive
 synchronization can be utilized.

 CNH2  Motor start mode
 ----------------------
 x      9-10 CLOSE   The motor is started immediately after power is
                     turned on.
        9-10 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 is controlled with the
 START/STOP UNIT command for both modes. By setting this feature, all
 IDDs spin up when power is supplied. This may cause a surge to the
 incoming power lines. If multiple IDDs are used in the installation
 configuration, the SCSI START/STOP command or the Auto Spin-Up Delay
 function should be utilized. These commands automaticlly increment,
 based on address, the spin-up function on each IDD. This method is
 preferred in multiple IDD installations and requires approximately
 thirty (30) seconds for each IDD installed.


 CNH2  Auto Spin-Up Delay
 ------------------------
 x     11-12 CLOSE   Motor starts immediately with power on
       11-12 OPEN    Auto spin-up delay (Address dependent)

 When the Auto Spin-Up Delay is used with Motor Start mode setting
 CNH2 pins 9-10 shorted), a delay can be used to sequence spin motors
 in a multiple drive configuration. If Motor Start mode is shorted,
 this setting selects immediate spin-up or an address dependent delay.
 The delay is 30 seconds between each SCSI ID address. Address 0
 sequences first, followed by 1,2,3,4,5,6,7 to complete (8) devices
 to be ready.

 The controller does not know if all devices are present. Care should
 be given to address each IDD from seven (7) on down sequentially to
 expediate ready status.


 CNH2  Write/Read RAM enable
 ---------------------------
 x     13-14 CLOSE   When the jumper is Shorted (default setting), the
                     WRITE RAM and READ RAM commands are not allowed
                     to be execute.If the IDD receives either
                     commands, it reports CHECK CONDITION status with
                     ILLEGAL REQUEST/Invalid Command Operation Code.
       13-14 OPEN    When the jumper is OPEN, the IDD accepts and exe-
                     cutes the WRITE/READ RAM commands as described in
                     the Logical Specification. In this case, the data
                     buffer space available for normal READ/WRITE
                     operations is 248KB.


 CNH3  For factory use only
 --------------------------
       All jumpers are closed


 CNH4/CNH5 SCSI terminating resistor power
 -----------------------------------------
 x      1- 2 CLOSE   Power is supplied to the terminating resistor
 x      3 -4 CLOSE   from the IDD and TERMPWR pin. Power is supplied
                     to the TERMPWR pin from the IDD.

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

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

        1- 2 OPEN    Power is not supplied to the terminating resistor
        3- 4 OPEN


 The table shows, how to supply power to the IDD SCSI terminating re-
 sistor module and how to use TERMPWR lines on the SCSI bus. When the
 IDD connects to a position other than at either end of the SCSI cable
 do not mount the terminating resistor modules on the IDD.

       +-----------------------------------------------------+
       |                     +--- CNH4/CNH5 ---+   -+- +5V DC|
      +++                    | 1  2     4    3 |    |        |
        | TERMPWR +------+   +-+--+-----+----+-+    +        |
      S *---------+ FUSE +-----+  |     |    +------+        |
      C |         +------+        +-----+----+---------+     |
      S |                             +------+-----+   |     |
      I *-----------------------------+ Terminator |  -+-    |
        | SIGNAL             Inserted | Circuit    |  -+-    |
      +++                    in socket+------+-----+   |     |
       |                                     + GND     + GND |
       +-----------------------------------------------------+


 CNH6 M265xH/HD differential only

      Spindle sync termination jumpers
 -------------------------------------
 x      1- 2 CLOSE   Spindle Sync PH 150 /330
        1- 2 OPEN

 x      3- 4 CLOSE   Spindle Sync PL 150 /330
        3- 4 OPEN


 CNH6 M265xS single-ended only

      Spindle sync termination jumpers
 -------------------------------------
 x      1- 2 CLOSE   Spindle Sync 1K /1.5K
        1- 2 OPEN

        3- 4 CLOSE   No Connect
        3- 4 OPEN


 CNH7  For factory use only
 --------------------------


 CN3/CN4 Setting terminals
 -------------------------
 These terminals can be used as a connector for the external operator
 panel.
 Some setting functions are assigned on the same pins of both CN3/CN4.
 For the dual port drive M265xHD, CN3 defines the SCSI ID for Port A
 CN4 defines the SCSI ID and Port Enable for Port B.
 "Write Protect", "Diagnostic Enable" and "External Reset" are inde-
 pendent of SCSI port and are selected by CN3 pins (15-20).
 Pins CN4 (9,10) and CN3 (9-14) are for external operator panel
 functions.


 CN3/CN4 SCSI ID
 ---------------

         SCSI ID|CN3/4|CN3/4|CN3/4|
                | 1-2 | 3-4 | 5-6 |
         -------+-----+-----+-----+
           0    |OPEN |OPEN |OPEN | Set the SCSI ID so that there are
           1    |CLOSE|OPEN |OPEN | no duplicates between SCSI devices
           2    |OPEN |CLOSE|OPEN | on the same SCSI bus.
           3    |CLOSE|CLOSE|OPEN |
           4    |OPEN |OPEN |CLOSE| The priority of SCSI bus ARBITRA-
           5    |CLOSE|OPEN |CLOSE| TION phase is determined by SCSI
           6    |OPEN |CLOSE|CLOSE| ID as follows: 7>6>5>4>3>2>1>0
 x         7    |CLOSE|CLOSE|CLOSE|


 CN3/CN4 Port enable
 -------------------
 x      7- 8 CLOSE   Enable SCSI access
        7- 8 OPEN    Disable SCSI access

 Enabling and disabling commands and responses on the SCSI interface
 is the function of this setting terminal. Each port on the M265xHD
 can be controlled independently. In normal operations, this setting
 terminal must be shorted.


 CN3 Write protect
 -------------------
 x     15-16 CLOSE   Enable Write Access to Disk
       15-16 OPEN    Disable Write Access

 Allowing or disallowing writes to disk is controlled by setting this
 jumper. In normal operation, this setting must be shorted.


 CN3 Offline self-diagnostics
 ----------------------------
 x     17-18 CLOSE   Disable self-diagnostics
       17-18 OPEN    Enable diagnostics

 IDD controller functions can be tested with offline self-diagnostics.
 In normal operations, this setting must be shorted.


 CN3 External Reset
 ----------------------------
       19-20 CLOSE   Reset M265x
 x     19-20 OPEN    Allow operation

 For debug purposes this setting can be utilized. This is not a normal
 operation for a jumper. This pin setting should be utilized through
 an operator panel equipped with a momentary switch. Normal operation
 occurs with no jumper installed.



**********************************************************************
                      I   N   S   T   A   L   L
**********************************************************************
FUJITSU  M2651/53-S/H, M2652/54-S/H/HD  OEM MANUAL 41FH5051E-03

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

 Installation direction
 ----------------------
     horizontally                          vertically
    +---------------+                  +--+                  +--+
    |               |                  |  +-----+      +-----+  |
    |               |                  |  |     |      |     |  |
 +--+---------------+---+              |  |     |      |     |  |
 +----------------------+              |  |     |      |     |  |
                                       |  |     |      |     |  |
      X           X                    |  |     |      |     |  |
 +------X-------X-------+              |  |     |      |     |  |
 +--+-----X---X-----+---+              |  +-----+      +-----+  |
    |      X X      |                  +--+                  +--+
    |    X    X     |
    +--X--------X---+
     X            X

 The tolerance of the angle is   5* from the horizontal plane.

 Ambient temperature
 -------------------
 The IDD must conform to the environmental requirements. When the IDD
 is operating, the ambient temperature measured 3 cm from the Disk
 Enclosure (DE) surface and from the main PCA surface must satisfy the
 specified requirements. It is recommended that the drive be mounted
 in such a way that air is moving around the unit at a velocity of
 approximately 1 m/s (3 ft/s).


 Multi-drive connection
 ----------------------
 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.

 Cable requirements
 ------------------
 The maximum length of SCSI cable is as follows. If more than one SCSI
 device is connected, the total cable length must not exceed the fol-
 lowing:
          Cable length for single ended:       6m Max.
          Cable length for differential ended: 25m Max.

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

    Single ended type: Conductor size: 28 American Wire Gauge (AWG)
                                       or bigger
                       Characteristic Impedance: 100 to 132

    Differential type: Conductor size: 28 AWG or bigger
                       Characteristic Impedance: 100 to 122

 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 to the last SCSI device
 except when the cable has a terminating resistor and the SCSI device
 does not have a terminating resistor.

 Check, that system power is off before connecting or disconnecting
 cables!

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

 Signal ground connector
 -----------------------
 For DC ground, an SG terminal is mounted on the rear of the drive.
 A DC ground cable may be installed depending on the system require-
 ments. This cable is generally connected to the ground of the power
 supply unit. Connection between IDD's may be in a daisy chained.

 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.


 SCSI cable                   SCSI cable
 ----------++-------+         ----------++-------++-------X TERM
       +---++--+ +-xxx---+          +---++--+ +--++---+
       |       | | TERM  |          |       | |       |
       |       | |       |          |       | |       |
       |  IDD  | |  IDD  |          |  IDD  | |  IDD  |
       +-------+ +-------+          +-------+ +-------+
            Correct                     Correct

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

 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

 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:

 1. Issue START/STOP UNIT commands at 30-second intervals to start
 the spindle motor.
 2. Turn on the +12 V DC power in the power supply unit at 30-second
 intervals to start the spindle motors sequentially.
 3. Set the spindle motor start control mode to delay automatic spin
 up based on the SCSI ID of the IDD. (AN ID=7 spins up immediately.
 An ID=6 delays 30 seconds. An ID=5 delays 2x30 seconds, etc.)

 Noise filter
 ------------
 To eliminate ac line noise, a noise filter should be installed at the
 ac input terminal on the IDD power supply unit.
 Attenuation: 40 dB or more at 10 MHz.

 External operator panel connector
 ---------------------------------
 CN3 (and CN4 for HD model)
 Connectors for the external operator panel are provided on the IDD
 SCSI interface PCBA. They allow connection of an external write pro-
 tect switch, a Ready/Active LED, an Offline Test Switch, Port Enable
 Switch, a Port Enable LED and a SCSI ID setting switch.
 The external operator panel is installed only when required for the
 system. If it is unnecessary, pins 1 to 8 of the CN3 (and CN4 if
 applicable) connectors for the external operator panel on the IDD
 must be set according to desired configuration using shorting plugs.

   CN3  (Port A)
 +------+
 | 1   2| ID1
 | 3   4| ID2
 | 5   6| ID4
 | 7   8| Port Enable/Disable
 |15  16| Write protect is permitted/inhibited
 |17  18| Disable diagnostics / Start offline diagnostics
 |19  20| Reset is activated to IDD (should be momentary)
 |      |
 |      |        LED  330     The external SEL LEDs are identical in
 | 9 ---+ -SELA --+<--XXXX-+  indication to the LEDs in the back of
 |      |                  |  the IDD for a dual port drive.
 |11 ---+ +5VDC -----------*+
 |      |        LED  330  || The external RDY LED is identical in in-
 |13 ---+ -RDY  --+<--XXXX-+| dication to the LED on the front of the
 +------+                   | IDD. The indication is changed with a
   CN4  (Port B)            | terminal setting.
 +------+                   |
 | 1   2| ID1               | Any load other than the external LED and
 | 3   4| ID2               | series resistor should not be connected
 | 5   6| ID4               | to the RDY/SEL LED terminals.
 | 7   8| Port Enable/Disab |
 |      |                   |
 |      |        LED    330 |
 | 9 ---+ -SELB --+<--XXXX--+
 +------+

 CN6 Spindle sync connector
 A connector is provided for spindle synchronization operation on the
 IDD interface PCA. This allows the IDD to be connected together for
 spindle sync operation. Spindle sync cable on all IDD SCSI interfaces
 are daisy-chained with the spindle sync cable. The maximum number of
 IDD's that can be connected in a single daisy-chained connection is 7

 Setting of CN3/CN4 can be changed when power is on. The following
 setting is valid after power is turned on again, the SCSI bus is
 reset, or the port is disabled and then enabled.

 Do not connect or disconnect jumpers after power is on except CN3/CN4
 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.

    When power is turned on, the IDD executes initial self-diagnosis.
    If an error is detected in the initial self-diagnosis, the LED on
    the front panel blinks. The spindle motor may start rotating in
    this stage.
    When the LED display jumper is removed for "READY status" (see
    JUMPERS CHN1 1-2 LED requirements), the LED on the front panel
    lights 45 seconds after power is turned on. At this time, the LED
    on the front panel blinks while the IDD reads "system informati-
    on" from the system space on the disk.
    When the LED display jumper is set for "in connection with SCSI
    bus" (factory setting), the LED on the front panel remains off
    (when the initiator accesses the IDD via the SCSI bus, the LED
    lights). However, the disk drive enters the READY status in 45
    seconds after power is turned on. At this time, the IDD reads
    "system information" from the system space on the disk.

 2. Initial operation in the case where the jumper is removed so that
    motor starts with a START/STOP command.

    When power is turned on, the IDD executes initial self-diagnosis.
    If an error is detected in the initial self-diagnosis, the LED on
    the front panel blinks.
    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.
    The disk drive enters the READY status 45 seconds after the
    START/STOP UNIT command is issued. At this time, the IDD reads
    "system information" from the system space on the disk.

 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.

    When the LED display requirements are set to "READY status", the
    LED is turned off while the drive continues the seek operations.
    However, since the LED is turned off for only an instant, 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 on the front panel lights only when the IDD is
    connected to the SCSI bus. Howerver, in some commands or when
    "disconnection from the bus" is enabled, the LED may only be
    turned on for 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: 2 minutes after power on). When the LED display re-
    quirements are set to "READY status", the LED on the front panel
    blinks during the adjustment.

 Removing 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|
 +--------+---------+---------+----------+-----+-------+
 |M265xS  |  2613   |    2    |   2615   | 15  |   87  |
 +--------+---------+---------+----------+-----+-------+



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
FUJITSU  M2651/53-S/H, M2652/54-S/H/HD  OEM MANUAL 41FH5051E-03

 Media defect
 ------------
 The number of allowable media defects are: M2651x < 480, M2652x < 600
 M2653x < 450, M2654x < 630.
 The maximum defect length is 8 bytes.


 Format capacity
 ---------------
 The size of the usable area for storing user data on the IDD (format-
 ted capacity) varies according the logical data block size. (180,
 256, 512, 1024, 2048, 4096, 4160) The data format on the user space
 can be specified with the MODE SELECT command.


 High speed data transfer
 ------------------------
 The data transfer rate on the SCSI bus is 3.0 MB/s maximum in asyn-
 chronous mode and 5.0 MB/s maximum in synchronous mode and 10 MB/s
 maximum in FAST SCSI synchronous mode. Such a high data transfer rate
 on the SCSI bus can be usefull with the large capacity buffer in the
 IDD.

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

 The maximum data transfer rate in synchronous mode on the
 single-ended SCSI bus may be limited by the cable length and
 transmission characteristics of the SCSI bus.


 Command stack feature
 ---------------------
 The IDD has a command stack feature corresponding to up to 7 initia-
 tors (14 for M265xHD). Therefore, the IDD can accept and stack an
 input/output command issued by another initiator even if the IDD is
 executing another command. The stack command is retrieved and exe-
 cuted in stacked order after the present command has completed.


 Command queuing feature
 -----------------------
 The IDD supports tagged command queuing in all three forms specified
 by SCSI (Simple, Ordered and Head of Queue). Each initiator is pro-
 vided with the capability of having multiple SCSI commands active at
 the IDD. Up to 256 commands may be queued in the IDD.



**********************************************************************
                      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.


