
D 5 8 9 4 D    NEC
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders    1680|     |     |
Capacity form/unform  1405/      MB        Heads          19|     |     |
Seek time   / track  11.0/ 1.5 ms          Sector/track     |     |     |
Controller           SCSI2 DIFFERENTIAL    Precompensation 65535
Cache/Buffer            64 KB              Landing Zone     1679
Data transfer rate    4.600 MB/S int       Bytes/Sector      512
                      5.000 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     %         8 80    |      8 90
       standby            W     Altitude    km            3.000|        12.000
       idle               W     Shock        g         2       |     20
       seek               W     Rotation   RPM      5400
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h      50000
                                Warranty Month
Lift/Lock/Park     YES          Certificates                                  

**********************************************************************
                        L   A   Y   O   U   T
**********************************************************************
NEC      D5894-D  PRODUCT DESCRIPTION REV. A 11/1991

  +---------------------------------------------------------+
  |                                +--+Dip                  |
  |                                |  |Switches             |XX
  |                                |  |for SCSI             |XX J1
  |                             SW1+--+ID                   |XX
  |                                               +--+      |XX
  |                                            SW4+--+      |XX I
  |                                               +------+  |XX N
  |     SINGLE-ENDED                           SW3+------+  |XX T
  |                                               +------+  |XX E
  |                                  Dip Switches-+------+  |XX R
  |                                  for terminating    SW2 |XX F
  |                                  resistors              |XX A
  |                                                         |XX C
  |                                                         |XX E
  |                                                         |
  |                                                         |XX J3
  |                                                         |XX Power
  +---------------------------------------------------------+







  +---------------------------------------------------------+
  |                                +--+Dip                  |
  |                                |  |Switches             |XX
  |                                |  |for SCSI             |XX J1
  |                             SW1+--+ID                   |XX
  |                                                         |XX
  |                                                         |XX I
  |                                                         |XX N
  |     DIFFERENTIAL                                        |XX T
  |                                               +------+  |XX E
  |                                  Dip Switches-+------+  |XX R
  |                                  for terminating    SW2 |XX F
  |                                  resistors              |XX A
  |                                                         |XX C
  |                                                         |XX E
  |                                                         |
  |                                                         |XX J3
  |                                                         |XX Power
  +---------------------------------------------------------+



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
NEC      D5894-D  PRODUCT DESCRIPTION REV. A 11/1991

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

 SW1  SCSI Address Setting
 -------------------------
               +------------------------+
               |+-++-++-++-++-++-++-++-+|ON
               ||x||x||x||x||x||x||x||x||
               |+-++-++-++-++-++-++-++-+|OFF
               +-1--2--3--4--5--6--7--8-+
                          |  |  |     +---- Write Protect
                 2  1  0  |  |  +---------- Slow Cable
                 +--+--+  |  +------------- Parity Enable
                 SCSI     +---------------- Spinup Disable
                 Address

 The SCSI address is factory-set to "0". If two or more SCSI devices
 are connected to the same bus or the arbitration priority is to be
 altered, alter the SCSI address with switches SW1-1, SW1-2 and SW1-3.

   +----------+-------+-------+-------+
   | SCSI ID  | SW1-1 | SW1-2 | SW1-3 |
   |          |   2   |   1   |   0   |
   +----------+-------+-------+-------+
   |    0     | OPEN  | OPEN  | OPEN  |
   +----------+-------+-------+-------+
   |    1     | OPEN  | OPEN  | CLOSED|
   +----------+-------+-------+-------+
   |    2     | OPEN  | CLOSED| OPEN  |
   +----------+-------+-------+-------+
   |    3     | OPEN  | CLOSED| CLOSED|
   +----------+-------+-------+-------+
   |    4     | CLOSED| OPEN  | OPEN  |
   +----------+-------+-------+-------+
   |    5     | CLOSED| OPEN  | CLOSED|
   +----------+-------+-------+-------+
   |    6     | CLOSED| CLOSED| OPEN  |
   +----------+-------+-------+-------+
   |    7     | CLOSED| CLOSED| CLOSED|
   +----------+-------+-------+-------+


 SW1-4  SPINUP DISABLE
 ---------------------
 When switch SW1-4 is ON, the drive motor is not turned on until the
 host device issues the SCSI Start Unit Command. When this switch is
 OFF, the drive motor is turned on automatically when the power is
 turned on.

 This switch is factory-set to OFF.


 Spindle Motor Starting
 ----------------------
 Spinup Disable Switch is OFF
 When the drive detects that the +5 VDC and +12 VDC power supplies are
 within the specified ranges, it executes drive power up tests. After
 the tests are complete, it becomes ready for SCSI interface logical
 connection, and starts the spindle motor. It becomes ready for the
 SCSI commands that require the drive ready when the spindle motor
 rotation gets to the specific speed.

 Spinup Disable Switch is ON
 When the drive detects that the +5 VDC and +12 VDC power supplies are
 within the specified ranges, it executes drive power up tests. It
 becomes ready for SCSI interface logical connection, and ready for
 the SCSI commands that don't require the spindle motor is rotating.
 It doesn't start the spindle motor until it receives the SCSI Start
 Unit Command.


 SW1-5  SCSI PARITY ENABLE
 -------------------------
 When switch SW1-5 is ON, SCSI bus parity is checked by this drive.
 When this switch is OFF, SCSI bus parity is not checked.

 This switch is factory set to ON.

 SCSI parity is generated by this drive regardless of this switch
 setting.


 SW1-6  SLOW CABLE
 -----------------
 When switch SW1-6 is ON, the data setup times and transmit periods
 when this drive transmitting to the SCSI bus are increased. When this
 switch is OFF, the standard data setup times and transmit periods are
 used.

 This switch is factory-set to OFF.


 SW1-7 has no function!


 SW1-8  WRITE PROTECT
 --------------------
 When switch SW1-8 is ON, this drive is write-protected.
 When this switch is OFF, this drive is not write-protected.

 This switch is factory-set to OFF.


 Terminator Power Setting
 ------------------------
            SW3                        SW2
 ON +------------------------++------------------------+
    |+-++-++-++-++-++-++-++-+||+-++-++-++-++-++-++-++-+|
    ||x||x||x||x||x||x||x||x||||x||x||x||x||x||x||x||x||
    |+-++-++-++-++-++-++-++-+||+-++-++-++-++-++-++-++-+|
 OFF+-1--2--3--4--5--6--7--8-++-1--2--3--4--5--6--7--8-+
      |  +--+--+--+--+--+--+----+--+--+--+--+--+--+--+---Termination
      |                                                  ON/OFF
      +-------------------------- Termination Power ON/OFF

 ON +------------+ SW4
    |+-++-++-++-+|
    ||x||x||x||x||
    |+-++-++-++-+|
 OFF+-1--2--3--4-+
      +--+--+--+----Termination ON/OFF

 When Switch SW2-1 is ON, this drive provides terminator power for the
 SCSI bus cable. When switch SW2-1 is OFF, this drive does not provide
 terminator power.

 This switch is factory-set to ON.


 SW2-1  Termination Power Setting
 --------------------------------
 When switch SW2-1 is ON, this drive provides terminator power for the
 SCSI bus cable. When switch SW2-1 is OFF, this drive does not provide
 terminator power.

 This switch is factory-set to ON.


 Terminating Resistor Setting
 ----------------------------
 If three or more SCSI devices are connected to the same SCSI bus, the
 terminating resistors of SCSI devices except the one located at the
 furthest end of the cable must be set to OFF.

 In this drive, the terminating resistors can be switched ON or OFF
 with switches SW2-2 to 8 and SW3-1 to 8.

 The terminating resistor switches of this adapter is factory-set to
 ON. Set them to OFF unless connected at the furthest end of the
 cable.



**********************************************************************
                      I   N   S   T   A   L   L
**********************************************************************
NEC      D5894-D  PRODUCT DESCRIPTION REV. A  11/1991

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

 Drive mounting
 --------------

     horizontally             vertically
   +-----------------+   +--+             +--+ +------------------+
   |                 |   |  +-----+ +-----+  | |                  | x
   |                 |   |  |     | |     |  | x+----------------+x
 +-+-----------------+-+ |  |     | |     |  | ||x              x||
 +---------------------+ |  |     | |     |  | ||  x          x  ||
                         |  |     | |     |  | ||    x      x    ||
      x           x      |  |     | |     |  | ||      x  x      ||
 +------x------x-------+ |  +-----+ +-----+  | ||       xx       ||
 +-+------x--x-------+-+ +--+             +--+ ||     x    x     ||
   |       xx        |                         ||   x        x   ||
   |     x    x      |                         || x            x ||
   +---x--------x----+                         |x                x|
     x            x                           x++----------------++x
      UNACCEPTABLE!                                UNACCEPTABLE!

 The D5894 magnetic disk drive can be installed both horizontally and
 vertically. When installing the drive horizontally, be sure to
 install the drive with the main printed wiring assembly faced down.
 (Do not face the front panel of the drive upward or downward.)

 Fix the drive using four tap holes. Use #6-32UNC (4mm or less deep).

 A SCSI bus cable, power cable, and frame ground cable are required
 to operate the drive. If two or more SCSI devices are connected to
 the same SCSI bus cable, SCSI address setting and terminating
 resistor ON/OFF switches must be altered properly. The drive has some
 optional function setting by switches to be set depending on the
 desired operating.

 When natural cooling is used, be sure that the air around the drive
 circulates smoothly so that the heat generated by the drive does not
 accumulate.

 When the drive is installed in a cabinet, use a fan in order to
 circulate the air.


 Interface Connector
 -------------------
 Connector J1 is a 50-pin non-shielded connector used for interface to
 the SCSI bus.

 50 conductor flat cables and 25-signal twisted-pair cables can be
 used for the SCSI bus. Cables of impedance 100 ohms +10% and
 conductor diameter 28 AWG or more should be used to match the
 impedance of the drive.


 Power Connector
 ---------------
 Connector J3 for power supply is an AMP P/N 172349-1 or the
 equivalent.

 The connector housing AMP P/N 1-480424-0 of the cable suits this
 connector. Select a power cable, considering the current consumption
 and cable length, and use connector pins that suit the cable
 material.

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


 Frame Ground Connector
 ----------------------
 Connector J4 for frame ground is an AMP P/N 61761-2 or the
 equivalent.

 The disk enclosure assembly does not have to be grounded because it
 is connected to the signal ground. The frame and disk enclosure
 assembly are insulated from each other. If the frame has to be
 grounded for safety, use connector J4. The recommended mate connector
 is AMP P/N 62187-1.


 SCSI Bus
 --------
 On the SCSI bus, only two SCSI devices can communicate at any given
 time. When two SCSI devices communicate, one acts as the Initiator
 and the other acts as the Target. The Initiator originates an
 operation and the Target performs the operation. The D5894 always
 acts as the Target.

 The following figure shows examples of SCSI bus connection. This
 drive has connector J1 for connection to the SCSI bus cable.

 The device connected at each furthest end of the cable must have
 terminating resistors installed. This drive has terminating resistor
 switches with which terminating resistors can be installed or removed
 easily.

            Single Initiator, Single Target
   +---------+                           +--------+
   |Initiator|<----SCSI-BUS------------->| Target |
   +---------+                           +--------+


            Single Initiator, Multi Target
   +---------+                           +--------+
   |Initiator|<----SCSI-BUS------+------>| Target |
   +---------+                   |       +--------+
                                 |
                                 |       +--------+
                                 +------>| Target |
                                         +--------+


            Multi Initiator, Multi Target
   +---------+                           +--------+
   |Initiator|<--+-SCSI-BUS------+------>| Target |
   +---------+   |               |       +--------+
                 |               |
                 |               |
   +---------+   |               |       +--------+
   |Initiator|<--+               +------>| Target |
   +---------+                           +--------+



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
NEC      D5894-D  PRODUCT DESCRIPTION REV. A 11/1991

 Outline and Features
 --------------------
 The D5894 Magnetic Disk Drive is a 5.25-inch Winchester disk drive,
 having an unformatted storage capacity of 1.6 Mbytes, employing Small
 Computer System Interface (SCSI).

 Features
 --------
 SCSI Interface

 Employs Single-ended interface.

 Supports synchronous SCSI bus data transfers up to 5.0 Mbyte per
 second.

 Executes asynchronous SCSI bus data transfer with quick response of
 REQ/ACK handshakes in Data IN/OUT phase.

 Contributes to reduction of overhead of SCSI command execution with
 quick changes in bus phases.

 Supports logical block sizes of 512 through 4096 bytes in one byte
 granularity.

 Supports the defect management that tries to allow contiguous access
 to sequential logical blocks around a defective block to reduce the
 additional latency time.


 Disk Drive
 ----------
 Performs highly reliable accessing at high speed by a voice coil
 motor with its servo surface located in the middle of the disk drive.

 Provides a Contact Start/Stop (CSS) area on the innermost of magnetic
 media.

 Protects the drive from delivery vibration and impacts by the auto
 retract functions to the CSS area.

 Uses a brushless DC spindle motor controlled by a dedicated micro-
 processor for precise speed control.


 Seek Time
 ---------
       +----------------------------------+--------+
       |                                  | D5894  |
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |   1.5  |
       +----------------------------------+--------+
       |Average                msec. typ. |  11    |
       |                       msec. max. |  24    |
       +----------------------------------+--------+
       |Latency                msec. avg. |   5.56 |
       +----------------------------------+--------+


 User Data Capacity
 ------------------
       +---------+-----------+-------------+
       |Bytes per|Sectors per|Capacity (MB)|
       |Sector   |Track      |             |
       +---------+-----------+-------------+
       |   512   |     86    | 1,405       |
       +---------+-----------+-------------+
       |  1024   |     44    | 1,431.3     |
       +---------+-----------+-------------+
       |  2048   |     22    | 1,431.3     |
       +---------+-----------+-------------+
       |  4096   |     11    | 1,431.3     |
       +---------+-----------+-------------+


