Hard Drive: SEAGATE: ST42100N WREN 9 1900MB 5.25"/FH SCSI2 SE

S T 4 2 1 0 0 N             W R E N   9    SEAGATE
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders    2573|     |     |
Capacity form/unform  1900/ 2200 MB        Heads          15|     |     |
Seek time   / track  12.9/ 2.0 ms          Sector/track     |     |     |
Controller           SCSI2 SINGLE-ENDED    Precompensation
Cache/Buffer           256 KB              Landing Zone
Data transfer rate    3.875 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        10 50    |    -10 54
Power: sleep              W     Humidity     %                 |
       standby            W     Altitude    km                 |
       idle          21.0 W     Shock        g                 |
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h     150000
                                Warranty Month        60
Lift/Lock/Park     YES          Certificates

Layout

SEAGATE ST42100N/ND PRODUCT MANUAL

  +---------------------------------------------------------+
  | +-+                                                     |+-1
  | | | J6                                                  || |J4
  | +-+                                                     |+-+
  |                                                     ++  |XX
  |                                                     ||  |XX
  |                                                     ||  |XX
  |                                     Terminator      +1  |XX J3
  |                                     resistor        ++  |XX SCSI
  |                                     (SIPs)          ||  |XX I/O
  |                                                     ||  |XX
  |                                                     +1  |XX
  |                                                     ++  |XX
  |                                                     ||  |XX
  |                                                     ||  |X1
  |                                                     +1  |
  | +-+J7                                                   |XX Power
  | +-+ LED                                                 |XX
  +---------------------------------------------------------+  1

Jumpers

SEAGATE ST42100N/ND JUMPER SETTING

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

 J4 SCSI ID/Option Select Header
 -------------------------------
                                            +-----
                                            |O O O
 -PWA---+-2--4--6--8--10-12-14-16-18-20+----+
        | o  o  o  o  o  o  o  o  o  o |    |O O
        | o  o  o  o  o  o  o  o  o  o |    +-----
        +-1--3--5--7--9--11-13-15-17-19+
          |  |  +--+--+  |  |  |  +--+-- Synchronous Spindle option
          |  |     |     |  |  +-------- Motor Start Delay (16s * ID)
          |  |     |     |  +----------- Parity check enable
          |  |     |     +-------------- Motor start option enable
          |  |     +-------------------- SCSI ID
          |  +-------------------------- Terminator power
          +----------------------------- Terminator power

 J4  1-2/3-4  Terminator Power
 -----------------------------
   +-2-4---        +-2-4---          +-2-4---
   | X o           | o X             | o o
   | X o           | o X             | xxx
   +-1-3-          +-1-3-            +-1-3-
 Terminator Power  Terminator Power   Terminator Power
 from Drive        to SCSI Bus        from SCSI Bus
 (DEFAULT)

 J4  SCSI ID
 -----------
   +----------+-----------------------+
   | SCSI ID  |        Jumpers        |
   |          | 5-6   | 7-8   | 9-10  |
   +----------+-------+-------+-------+
   |    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|
   +----------+-------+-------+-------+

 J4 11-12 Motor Start Option
 ---------------------------
 11-12 CLOSED  Enables the Motor Start Option. In this mode of
               operation the drive will wait for a Start Unit Command
               from the Host before starting the Motor.

J4 13-14 Parity Check
----------------------
13-14 CLOSED Parity checking is enabled.

J4 15-16 Motor Start Delay
---------------------------
Jumper on enables delayed motor start (Motor Start jumper must be
off). Motor start up is delayed 16 times drive ID number in seconds;
i.e., Drive 0 starts immediately, Drive 1 starts 16 seconds later,
Drive 2 starts 16 seconds after Drive 1, etc.

 J6  Write Protect/Remote LED Header
 -----------------------------------
                +------- GND              Pin 1 (+5V) Remote LED
           +----+----+                    connection
           | 2  o  x +---- Reserved
           | 1  o  x +---- Reserved
           +----+----+
                +------- Write Protect Remote

The Write Protect/Remote LED Header is a 6-pin, 3 jumper (or
connector) position header behind the front panel at the right side
of the drive, opposite the LED. The pins are on 0.100 inch (2.54 mm)
centers both vertically and side to side. A suggested mating two pin
connector is the DuPont Mini Latch housing P/N 65291-008 or
equivalent. The drive front panel must not be present in order to
access the header. For a remote LED capability, plug the remote LED
cable connector vertically to the leftmost two pins of the header.
The center two pins provide a drive write protect capability. A
shorting jumper plug may be plugged vertically onto these two pins to
write protect the drive or a two-pin cable connector may be plugged
there to connect the two pins to a remote Write Protect switch. The
rigthmost two pins are RESERVED for factory use only.

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

Note: Pins on the drive select and configuration select header are
provided to facilitate manual drive configuration. No devices other
than jumpers should be connected to these pins. Improper connection
to external devices (switches, connectors, etc.) could adversely
affect drive performance. Exact location of these pins and headers
may change without notice.