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Hard Drive: FUJITSU: M2622SB 347MB 3.5"/HH SCSI2 SE




M 2 6 2 2 S B    FUJITSU
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/HH               Cylinders    1429|     |     |
Capacity form/unform   347/  387 MB        Heads           7|     |     |
Seek time   / track  12.0/ 3.0 ms          Sector/track     |     |     |
Controller           SCSI2 SINGLE-ENDED    Precompensation
Cache/Buffer           240 KB LOOK-AHEAD   Landing Zone
Data transfer rate    3.000 MB/S int       Bytes/Sector     1024
                      4.800 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    11.0 W     Acoustic   dBA        40
       spin-up            W     ECC        Bit   56
                                MTBF         h     200000
                                Warranty Month
Lift/Lock/Park     YES          Certificates

Layout

FUJITSU M2622SX/M2623SX/M2624SX OEM MANUAL 41FH5055E-01/41FH5069E-IM

  +---------------------------------------------------------+
  |                      SCSI         +------------+-1      |XX CN1
  |                      TERMINATING  |            +-+      |XX
  |                      RESISTOR     +--------------+      |XX SCSI
  |                                                         |XX
  |                                                         |XX C
  |        1+---+                                           |XX O
  |         |   |CNH4                                       |XX N
  |        3+---+                                           |XX N
  | 1---2           2   4                                   |XX E
  | |   |CN5        +---+ CNH3                              |XX C
  | +---+           1---3                                   |XX T
  |                                                         |XX O
  |                                                 24--23  |XX R
  |                                   2    4         |  |   |XX
  |                          2      8 +----+ CNH2    |  CNH1|
  |                     CNH7 +------+ 1----3         |  |   |XX Power
  |                          1------7                2--1   |XX CN1
  +---------------------------------------------------------+

   M2622SA/M2623SA/M2624SA, P/N B17B-1790-0050A
  +---------------------------------------------------------+
  |                      SCSI         +------------+-1      |XX CN1
  |                      TERMINATING  |            +-+      |XX
  |                      RESISTOR     +--------------+      |XX SCSI
  |                                                         |XX
  |                                   1---5 CN6             |XX C
  |        1+---+                     +---+                 |XX O
  |         |   |CNH4                                       |XX N
  |        3+---+                                           |XX N
  | 1---2           2   4                                   |XX E
  | |   |CN5        +---+ CNH3                              |XX C
  | +---+           1---3                                   |XX T
  |                                                         |XX O
  |                                                 24--23  |XX R
  |                                   2    4         |  |   |XX
  |                          2      8 +----+ CNH2    |  CNH1|
  |                     CNH7 +------+ 1----3         |  |   |XX Power
  |                          1------7                2--1   |XX CN1
  +---------------------------------------------------------+

   M2622/M2623/M2624FA/SA, P/N B17B-1790-0200A/-0250A
  +---------------------------------------------------------+
  |                              +---4 CNH2                 |XX 49
  |                              1---+                      |XX
  |                              +-------------++1          |XX I
  |                              |Terminator   ++           |XX N
  |                              +--------------+           |XX T
  |                                                         |XX E
  |                                1---5                    |XX R
  |                                +---+CN6                 |XX F
  |   1+-CNH4+                                              |XX A
  |   3+-----+                   24-+                       |XX C
  |                               | |                       |XX E
  |+---+                          | | CNH1                  |XX
  ||   |                          | |                       |XX 1
  |+CN5+                          +-1                       |
  |1   2                2  1                                |xx
  |                CNH3 +--+   +--------10                  |XX Power
  |                     +--+   1--------+ CNH7              |XX CN1
  +---------------------------------------------------------+

Jumpers

FUJITSU M2622SX/M2623SX/M2624SX OEM MANUAL 41FH5055E-01

Jumper setting
==============

x = Jumpers are set at factory

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

   - CNH1, CNH7
   - SCSI terminating resistor

Notes:
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.

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

  CN1   Single-Ended type SCSI connector
 ---------------------------------------
       Pin number    Signal    Signal    Pin number
       --------------------------------------------
          01         GND       -DB0          02
          03         GND       -DB1          04
          05         GND       -DB2          06
          07         GND       -DB3          08
          09         GND       -DB4          10
          11         GND       -DB5          12
          13         GND       -DB6          14
          15         GND       -DB7          16
          17         GND       -DBP          18
          19         GND       GND           20
          21         GND       GND           22
          23         (Open)    (Open)        24
          25         (Open)    TERMPWR (*1)  26
          27         (Open)    (Open)        28
          29         GND       GND           30
          31         GND       -ATN          32
          33         GND       GND           34
          35         GND       -BSY          36
          37         GND       -ACK          38
          39         GND       -RST          40
          41         GND       -MSG          42
          43         GND       -SEL          44
          45         GND       -C/D          46
          47         GND       -REQ          48
          49         GND       -I/O          50

 *1 Terminating resistor power (jumper selectable: For input only, for
    input and output, or open)

 CNH1  PER default values setting
 --------------------------------
            | PER default value of the MODE SELECT parameter
        ----+-----------------------------------------------
 x      1-2 | Short  "0"
            | Open   "1"

Set the default value of the PER (post error) flag of the read/write
error recovery parameter (page code=1) and verify error recovery
parameter (page code=7) of the MODE SELECT parameter according to
table.

The MODE SELECT parameter value specific to the user can be saved on
the disk with the MODE SELECT command specification. There are no
MODE SELECT parameter saved values on the IDD when the IDD is shipped
from the factory. The value set with the terminal is used as the ini-
tial value of PER flag when there are no saved values. When a saved
value is generated by the user, the IDD reads it when power is turned
on and operates using that value and this setting is ignored.

 CNH1  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,' |'0,0,1,0'  |             |         |         |
   | 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.

 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.

 CNH1  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 command when the IDD
keeps the UNIT ATTENTION condition. This mode is set for system re-
quirement, however, it is recommended to use the SCSI standard set-
ting (setting at factory shipment)

 CNH1  Reselection retry setting
 -------------------------------
            | Retry count of RESELECTION phase
        ----+---------------------------------
 x      9-10| Short    (unlimited)
            | Open   10

Set the retry mode of the RESELECTION phase according to table.

CNH1 Reserved
--------------
x 11-12 Reserved

 CNH1  SCSI bus parity setting
 -----------------------------
 x     13-14  Short  Executed
              Open   Not executed

Set whether the parity bit check of the SCSI data bus is executed
according to the table.

CNH1 Synchronous mode transfer request setting
-----------------------------------------------
Set whether synchronous mode transfer request from the TARG is en-
abled according to the 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.

 x     15-16  Short   Enabled
              Open    Disabled

This setting does not affect asynchronous mode transfer.

 When synchronous mode transfer 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 excahnged between
the IDD and INIT.
The INIT must determine the parameter sent to the IDD when the mes-
sage is exchanged in consideration of the signal transfer character-
istics of the system SCSI bus and the data reception capacity of the
INIT.
The IDD can transfer up to 4.8MB/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 transfered in a stable condition must be
determined for each system.

For reference, the IDD data transfer rate in synchronous mode and the
restrictions in the system configuration of the SCSI bus are shown
below. The following values are rough standards. The values must be
evaluated for each system.

 Single ended SCSI bus
    +----------------------+------------------+---------------------+
    |Maximum data transfer |Maximum length of |Number of connectable|
    |rate of the IDD (MB/s)|the SCSI cable (m)|SCSI devices         |
    +----------------------+------------------+---------------------+
    |    3.00 to 4.8       |        *         |         5*          |
    +----------------------+------------------+---------------------+
    |    2.67 or less      |      6.00m       |         8           |
    +----------------------+------------------+---------------------+
    * The maximum SCSI cable length and the number of connectable
      SCSI devices must be determined for each system.

 CNH1  LED display requirement setting
 -------------------------------------
 x     17-18  Short   Light when the IDD operates.
              Open    Light when the IDD is ready.

Set the display requirements of the LED on the front panel or exter-
nal operator panel.

 CNH1  Motor start mode setting
 ------------------------------
 x     19-20  Short   The motor is started immediately after power
                      is turned on.
              Open    Starting the motor is controlled with the
                      START/STOP command.

Set how to start the IDD spindle motor according to table. This set-
ting 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.

 CNH1  Supplying power to SCSI terminator resistor
 ---------------------------------------------------------------
 x     23-24  Short   Power is supplied to the terminating resistor
 x     21-22  Short   from IDD and TERMPWR pin. Power is supplied
                      to the TERMPWR pin from the IDD.

       23-24  Open    TERMPWR pin is not used. Power is supplied to
       21-22  Short   the IDD terminating resistor only from IDD.

       23-24  Short   Power is not supplied to the terminating
       21-22  Open    resistor from 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.

       +-----------------------------------------------------+
       |                     +------ CNH1 -----+   -+- +5V DC|
      +++                    | 23 24    22   21|    |        |
        | TERMPWR +------+   +-+--+-----+----+-+    + Diode  |
      S *---------+ FUSE +-----+  |     |    +------+        |
      C |         +------+        +-----+----+               |
      S |                             +------+-----+         |
      I *-----------------------------+ Terminator |         |
        | SIGNAL             Mounted  | resistor   |         |
      +++ +---+              in socket+------+-----+         |
       |  +---+IDD                           + GND           |
       +-----------------------------------------------------+

  CNH2  For testing at factory
 ---------------------- -----
       1-2   Open     User setting inhibited
       3-4   Open     User setting inhibited

The user must not be change CNH2 setting. (The IDD does not operate
correctly when shorted)

 CNH4  Spindle sync connector
 ----------------------------
       Pin number    Signal
       --------------------
          01         GND
          02         M. Sync
          03         Key Pin
          04         S. Sync

 CN1  Power connector
 --------------------
      Pin number     Power type
      -------------------------
          01         +12 VDC
          02         +12 VDC Return (GND)
          03         + 5 VDC Rerurn (GND)
          04         + 5 VDC

 CN5  External LED connector
 ---------------------------
        +---+       Pin        Signal
        |1 2|       01         LED (V)
     ---+---+--     02         -LED

 CN6   External operator panel connector
 ---------------------------------------
       Pin number    Signal
       --------------------
          01         GND
          02         -ID2
          03         GND
          04         -ID1
          05         GND
          06         -ID0

  CNH7  SCSI ID setting
 ---------------------
       SCSI ID    5-6    3-4    1-2
       ----------------------------
         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
 x       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.

Enabling or disabling write protect function is set by these jumpers.
By setting this write protect function, writing into disk medium is
inhibited.

Install

FUJITSU M2622SX/M2623SX/M2624SX OEM MANUAL 41FH5055E-01

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

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

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

Notes of mounting
-----------------
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 projektion of the screw from the IDD frame wall at the
    corner must be 4 mm or less.

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.

The maximum ambient temperature with in 45* C.

 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 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: A T-configuration is recommended.

External LED
------------
The external LED is installed only when required for the system. If
it is unnecessary, pins 01 and 02 of CN5: connector for the
external LED on the IDD must be opened.

Since the external LED is not provided as an option, this panel must
be fabricated at the user site referring to the recommendation if
necessary.

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 IDD 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 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

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 used 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 an 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!

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.

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. Connection between more than one IDD may
be daisy chain.

SCSI terminating resistor
-------------------------
The SCSI terminating resistor module is installed in the IDD 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:

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.

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

When mounting the terminator resistor module, check the mounting
direction and whether the module is fixed.

      +- Marker shows pin 1            +- Marker shows pin 1
      |                                |
      |  +-----------------+           |
      |  |* * * * * * * * *|           |  +*-*-*-*-*-*-*-*-*+
      +- *                 |           +- * Resistor        |
         |* * * * * * * * *|              +*-*-*-*-*-*-*-*-*+
         +-----------------+
         Demounting                      Mounting

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

 1. Initial operation in the case of setting is set 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. The spindle motor may
       or may not start rotating in this stage.
    3. When the LED display requirements are set to "the IDD does not
       operates", the LED on the front panel lights 10 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
    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 10 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 measure
      them with the IDD power connection position).
    * 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 does not
    operate", 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 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). The seek sound is heard
    during the adjustment but this does not indicate a drive error.

Dismounting drives
------------------
Dismount the drive after disconnecting system power. Do not remove
mounting screws holding the cables and drive while power is on.

Do not move the drive until it completely stops (15 seconds after
spindle motor is stopped with START/STOP UNIT command or after power
is turned off).

Features

FUJITSU M2622SX/M2623SX/M2624SX OEM MANUAL 41FH5055E-01

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

M2622: 160 and less
M2623: 210 and less
M2624: 260 and less

High speed data transfer
------------------------
The data transfer rate on the SCSI bus is 3MB/s maximum in asynchro-
nous mode and 4.8MB/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.

240KB data buffer
-----------------
Data is transfered between SCSI bus and disk media through the em-
bedded 240KB data buffer in the IDD.

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 stack feature
---------------------
The IDD has a command stack feature corresponding to up to 7 initia-
tors. 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 executed in stacked order
after the present command has completed.

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.

Mean Time Between Failures (MTBF)
---------------------------------
The estimated MTBF of the IDD during its life time is 200.000 hours
after an initial 3-month period.

Mean Time To Repair (MTTR)
--------------------------
MTTR is the average time taken ba 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 the first five years or
20.000 hours if handled correctly.

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 M2622Sx/M2623Sx/M2624Sx intelligent disk drive 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 failures, or any failures not caused by the drive
itself.

General

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.













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