
S T 1 5 2 3 0 W D           H A W K   4    SEAGATE
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/HH               Cylinders    3892|     |     |
Capacity form/unform  4294/ 5160 MB        Heads          19|     |     |
Seek time   / track  10.0/ 1.7 ms          Sector/track     |     |     |
Controller           SCSI2 DI/WI/FAST      Precompensation
Cache/Buffer           512 KB ADAPTIVE     Landing Zone
Data transfer rate    6.000 MB/S int       Bytes/Sector      512
                     20.000 MB/S ext SYNC
Recording method     RLL 1/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 55    |    -40 70
Power: sleep              W     Humidity     %         8 80    |      5 95
       standby            W     Altitude    km    -0.305  3.048| -0.305 12.192
       idle           9.0 W     Shock        g        10       |     60
       seek               W     Rotation   RPM      5411
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit   96
                                MTBF         h     800000
                                Warranty Month        60
Lift/Lock/Park     YES          Certificates     CSA,FCC,IEC435,UL478,VDE



**********************************************************************
                        L   A   Y   O   U   T
**********************************************************************
SEAGATE  ST15230W/WD/WC/DC  PRODUCT MANUAL 77767479 REV.  A 3/1995

  +---------------------------------------------------------++-+
  |                                                         || |
 +++1                                                       || |
 | |J6                                                      || |J1
 +++                                                        || |SCSI
  |       ST15230W/WD                                       || |I/O
  |                                                         || |
  |                                                         || |
  |                                                         |+-1
  |                                                         |+-+
  |                                                         || |J1
  |                                                         || |AUX
  |                                                         || |
  |                                                         |+-1
  |                                                         |XX J1
  |                                   8--------1            |XX Power
  |                                   +--------+J2          |XX
  +---------------------------------------------------------+  1







  +---------------------------------------------------------+
  |                                                         |
 +++1                                                       |
 | |J6                                                      |+-+
 +++                                                        || |SCSI
  |       ST15230WC/DC                                      || |I/O
  |                                                         || |J1
  |                                                         || |80Pin
  |                                                         || |
  |                                                         || |
  |                                                         || |
  |                                                         || |
  |                                                         || |
  |                                                         |+-+
  |                                                         |
  |                                   8--------1            |
  |                                   +--------+J2          |
  +---------------------------------------------------------+



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
SEAGATE  ST15230W/WD/WC/DC  PRODUCT MANUAL 77767479 REV. A  3/1995

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


   REAR VIEW                             +------ 5V
                                         | +---- GND
     (TOP)                     +5V       | | +-- GND
      34        J1         1    |    1   | | | + 12V
      +-------------------------+-----+ +-------+
  ----+|||||||||||||||||||||    ::::::+-+O O O O+-
      +-------------------------++----+ +-------+
      68pin I/O Cable           ||||||    Power
      Connection         Pin 12A+||||+----------- A0
                            GND--+||+------------ A1
                                  |+------------- A2
                                  +-------------- A3


             +- +5V
   ---------------------+                 Optional connections to
     * * * * o o o o o 1|                 switching circuits in host
       * * * o o o o o o| J6              equipment to etablished
   ---------------------+                 drive ID.
               | | | | |    Power
               | | | | +----------- A0
         GND---+ | | +------------ A1
                 | +------------- A2
                 +-------------- A3


 J1/J6 SCSI ID
 -------------
   +----------+-------------------------------+
   | SCSI ID  |       Jumper Location         |
   |          |             PINS              |
   |          |  7-8  |  5-6  |  3-4  |  1-2  |
   +----------+-------+-------+-------+-------+
   |    0     | OPEN  | OPEN  | OPEN  | OPEN  |
   +----------+-------+-------+-------+-------+
   |    1     | OPEN  | OPEN  | OPEN  | CLOSED|
   +----------+-------+-------+-------+-------+
   |    2     | OPEN  | OPEN  | CLOSED| OPEN  |
   +----------+-------+-------+-------+-------+
   |    3     | OPEN  | OPEN  | CLOSED| CLOSED|
   +----------+-------+-------+-------+-------+
   |    4     | OPEN  | CLOSED| OPEN  | OPEN  |
   +----------+-------+-------+-------+-------+
   |    5     | OPEN  | CLOSED| OPEN  | CLOSED|
   +----------+-------+-------+-------+-------+
   |    6     | OPEN  | CLOSED| CLOSED| OPEN  |
   +----------+-------+-------+-------+-------+
   |    7     | OPEN  | CLOSED| CLOSED| CLOSED|
   +----------+-------+-------+-------+-------+
   |    8     | CLOSED| OPEN  | OPEN  | OPEN  |
   +----------+-------+-------+-------+-------+
   |    9     | CLOSED| OPEN  | OPEN  | CLOSED|
   +----------+-------+-------+-------+-------+
   |   10     | CLOSED| OPEN  | CLOSED| OPEN  |
   +----------+-------+-------+-------+-------+
   |   11     | CLOSED| OPEN  | CLOSED| CLOSED|
   +----------+-------+-------+-------+-------+
   |   12     | CLOSED| CLOSED| OPEN  | OPEN  |
   +----------+-------+-------+-------+-------+
   |   13     | CLOSED| CLOSED| OPEN  | CLOSED|
   +----------+-------+-------+-------+-------+
   |   14     | CLOSED| CLOSED| CLOSED| OPEN  |
   +----------+-------+-------+-------+-------+
   |   15     | CLOSED| CLOSED| CLOSED| CLOSED|
   +----------+-------+-------+-------+-------+


      ------------+--------+-----PWA------------------
                  |87654321|J2
                  +--------+
 Enable Terminator-+||||||+-TERMPWR
 Delay Motor Start--+||||+--TERMPWR
 Enable Motor Start--+||+---SS
    Write Protect ----++----Parity Option


 J2 Terminator Power-source Table W/WD
 -------------------------------------
   ---1-+      ---1-+       ---1-+
    o o |       o X |        X o |
    xxx |       o X |        X o |
    ----+       ----+        ----+
 Term. Power  Term. Power   Term. Power
 from Bus     to SCSI Bus   from drive
 Pos. A

 -------------+-----------------------------------------------------
 J2           |
 Jumper       |
 Installation |Jumper Function Description
 -------------+-----------------------------------------------------
 TE (8)       |(Applies only to "W" models)
 ON           |With the jumper installed, the On-board (non-
              |removable) terminator circuits are enabled
              |(connected to the I/O lines). Default is jumper
              |installed.
              +-----------------------------------------------------
 OFF          |Terminator circuits not connected to I/O lines.
 -------------+-----------------------------------------------------
 DS  ME (7/6) |
 OFF OFF      |Spindle starts immediately after power up - Default
              |setting.
              +-----------------------------------------------------
 OFF ON       |Drive spindle does not start until Start Unit command
              |received from host. On Off Spindle Startup is delayed
              |by SCSI ID times 12 seconds after power is applied,
              |i.e., drive 0 spindle starts immediately when DC
              |power connected, drive 1 starts after 12 second
              |delay, drive 2 starts after 24 second delay, etc.
              +-----------------------------------------------------
  ON ON       |Drive spindle starts when Start Unit command received
              |from host. Delayed start feature is overridden and
              |does not apply when ME jumper is installed.
 -------------+-----------------------------------------------------
  WP (5)      |
  ON          |Entire drive is write protected. Off Drive is not
              |write protected. Default is no WP jumper installed.
 -------------+-----------------------------------------------------
  PE (4)      |
  ON          |Parity checking and parity error reporting by the
              |drive is enabled. Default is PE jumper installed.
              +-----------------------------------------------------
  OFF         |Drive checks parity, but does not report result of
              |parity checking to host.
 -------------+-----------------------------------------------------
  SS (3)      |
  OFF         |Reserved jumper position. Default is no jumper
              |installed.
 -------------+-----------------------------------------------------
  TP   TP(2/1)|(Not used on "WC/DC" models)
  OFF  OFF    |No terminator power is connected to drive terminators
              |or SCSI bus.
              +-----------------------------------------------------
  ON   OFF    |Drive supplies its own terminator power only. Jumper on
              |this position is factory default.
              +-----------------------------------------------------
  OFF  ON     |Drive supplies power to SCSI bus; pins 17, 18, 51 and
              |52 none to internal terminators. When drives have
              |differential I/O circuits, a jumper on the right TP
              |position may be needed to power external terminators
              |(see system documentation). The ST15230WD drive has
              |differential I/O circuits which have no terminator
              |circuits on the drive.
              |The "WC/DC" models have no provisions for
              |terminators on the drive and no provisions for
              |terminator power to be supplied to the 80 pin I/O
              |connector on the drive.
              +-----------------------------------------------------
  ON   ON     |Drive supplies terminator power to itself (internal
              |connection) and to SCSI bus pins 17, 18, 51 and 52.
              |This is a legal jumper setting.
              +-----------------------------------------------------
 TP Position A|(Applies to "W" models only)
 ON           |This horizontally positioned jumper across the two
              |TP positions nearest PCB edge, connects terminator
              |power from SCSI bus I/O pin 26 to the drive's
              |internal terminators (for single-ended I/O only).
              +-----------------------------------------------------
 OFF          |See above explanations for TP jumpers.
 -------------+-----------------------------------------------------
 -------------+-----------------------------------------------------
 J1-Auxiliary |
 Jumper       | Jumper Function Description ("W" and "WD" models only)
 Installation | Drive ID on SCSI Bus (J1-auxiliary or J6 may be used,
 A3,A2,A1,A0  | as the ID circuits are wired in parallel).
              | The drive ID is binary coded positionwise i.e. jumper
              | in position A 3 is drive ID 8, A 2 is drive ID 4,
              | position A 1 is ID 2, position A 0 is ID 1 and no
              | jumpers is ID 0. Default is ID = 0. Both J1- auxiliary
              | and J6 should not be used at the same time, because at
              | some future time when the ID is changed the user could
              | fail to configure both J1-auxiliary and J6 the same.
              | "WC/DC" Models, do not have J1-auxiliary.
 -------------+------------------------------------------------------
 -------------+------------------------------------------------------
 J6 Jumper    |
 Installation | Jumper Function Description ("W" and "WD" models only)
 A3,A2,A1,A0  | Drive ID on SCSI bus. Either J6 or J1-Auxiliary
              | (optional) may be used to select drive ID. Both
              | should not be used at the same time, because at some
              | future time when the ID is changed the user could fail
              | to configure both the same. Default is ID = 0.
 -------------+------------------------------------------------------
 -------------+------------------------------------------------------
 LED          | Time shared (see Note [4]) J6 pin 8 used to connect a
              | cable for a remote drive activity LED indicator. Pin 8
              | (bottom), the cathode connection, connects in the
              | drive to GRD through the emitter-collector junction
              | of a transistor switch that controls the LED on/off
              | condition. Pin 11, the anode connection, connects in
              | the drive to the +5 V supply through a pull-up
              | resistor. For "WC" and "DC" models LED signal in
              | J1 may be used instead.
 -------------+------------------------------------------------------

 NOTE
 The PCB on "WC/DC" models does not have connector J1-Auxiliary. It
 has a single 80 pin combined SCSI I/O and DC power connector instead
 of the 68 pin SCSI I/O and 4 pin DC power connectors. Includes among
 the 80 pins are the SCSI ID, Motor Start and Delayed Motor Start
 select functions, and the remote drive activity LED signal. Do not
 use J6 for these functions if the host uses the ones included in the
 80 pin J1 connector.

 NOTE
 Jumper header J6 can be used in one of five possible ways:

 - Do not use J6 at all, but instead use the same functions conveyed
   on lines in the 80 pin I/O J1 connector ("WC/DC" models), or for
   "W" and "WD" models, use J1-Auxiliary.

 - Use jumpers on J6 only to establish drive ID on the SCSI bus. Do
   not use both J6 and J1 or J1-Auxiliary signals to establish the
   drive ID. The drive activity LED signal in connector J1 or J1-
   Auxiliary may be used to convey that signal to/from the host.

 - Install a connector/cable on J6 for remote drive ID switching. Do
   not use both J6 and J1 signals to establish the drive ID. The drive
   activity LED signal in the 80 pin J1 I/O connector or J1-Auxiliary
   can be used in this situation.

 - Install a connector/cable on J6 for remote Drive Activity LED.
   Use the 80 pin I/O connector J1 for the drive ID signals ("WC/"DC"
   models) or J1-Auxiliary ("W" and "WD" models).

 - Install a connector/cable on J6 for all (remote ID switching and
   remote drive activity LED). Do not use both J6 and J1 or J1-
   Auxiliary to establish drive ID.



**********************************************************************
                      I   N   S   T   A   L   L
**********************************************************************
SEAGATE  ST15230W/WD/WC/DC  PRODUCT MANUAL 77767479 REV. A  3/1995

 Notes On Installation
 =====================


 Installation
 ------------
 Drive default mode parameters are not normally needed for installa-
 tion. Ensure that the SCSI ID of the drive is not the same as the
 host adapter. Most host adapters use SCSI ID 7, which is the highest
 priority on both 8 and 16 bit data busses.

  If multiple devices are on the bus set the drive SCSI ID to one
  that is not presently used by other devices on the bus.

  If the drive is the only device on the bus, attach it to the end
  of the SCSI bus cable. Permanently installed terminators must be
  enabled on the drive for ST15230W models using a jumper plug. For
  ST15230WD/WC/DC models, terminators must be installed external to
  the drive. These external terminators must be provided by the
  user, systems integrator or host equipment manufacturer.

  If the drive is attached to a bus that contains other devices, and
  the new drive is not attached to the end of the bus, the terminator
  enable jumper should be removed from the new drive.

  Set all appropriate option jumpers for desired operation prior to
  power on. If jumpers are changed after power has been applied,
  recycle the drive power to make the new settings effective.

  Installation instructions are provided by host system documentation
  or with any additionally purchased drive installation software.

  The manufacturers installed labels must not be removed from the
  drive or covered with additional labels, as they contain
  information required when servicing the product.


 Caching write data
 ------------------
 Write caching is a write operation by the drive that makes use of a
 drive buffer storage area where the data to be written to the
 medium is stored in one or more segments while the drive performs
 the write command.

 Write caching is enabled along with read caching. For write caching,
 the same buffer space and segmentation is used as set up for read
 functions. The buffer segmentation scheme is set up or changed
 independently, having nothing to do with whether or not read and
 write caching is enabled or disabled. When a write command is issued,

 the cache is first checked to see if any logical blocks that are to
 be written are already stored in the cache from a previous read or
 write command. If there are, the respective cache segments are
 cleared. The new data is cached for subsequent Read commands.

 If the number of write data logical blocks exceeds the size of the
 segment being written into when the end of the segment is reached,
 the data is written into the beginning of the same cache segment,
 overwriting the data that was written there at the beginning of the
 operation. However, the drive does not overwrite data that has not
 yet been written to the medium.


 Installation
 ------------
 The drive is designed, manufactured, and tested with a "Plug in and
 Play" installation philosophy. This phi-losophy minimizes the
 requirements for highly trained personnel to integrate the drive
 into the OEM's system, whether in a factory or field environment.

 The drive has been low level formatted at the factory and should
 not be reformatted, unless the sector size or sparing allocation
 scheme is changed.


 Air cleanliness
 ---------------
 The drive is designed to operate in a typical office environment
 with minimal environmental control.


 Drive Orientation
 -----------------
 The balanced rotary arm actuator design of the drive allows it to
 be mounted in any orientation. All drive performance
 characterization, however, has been done with the drive in
 horizontal (discs level) and vertical (drive on its side)
 orientations, and these are the two preferred mounting orientations.


 Cooling
 -------
 Cabinet cooling must be designed by the customer so that the ambient
 temperature immediately surrounding the drive will not exceed
 temperatur. Specific consideration should be given to make sure
 adequate air circulation is present around the PCBs to meet the
 requirements. Cables should be routed such that they do not block
 cooling air flow.


 Drive Mounting
 --------------
 When mounting the drive using the bottom holes care must be taken
 to ensure that the drive is not physically distorted due to a stiff
 non-flat mounting surface. The allowable mounting surface stiffness
 is 80 lb/in (14.0 N/mm). The following equation and paragraph define
 the allowable mounting surface stiffness:

                      k * x = 80 lb (14.0 N)

 where 'k' represents the mounting surface stiffness (units of lb/in
 or N/mm), and, 'x' represents the out-of plane mounting surface
 distortion (units of inches or millimetres). The out-of plane
 distortion ('x') is deter-mined by defining a plane with three
 of the four mounting points fixed and evaluating the out-of-plane
 deflection of the fourth mounting point when a known force is applied
 to the fourth point.


 Media description
 -----------------
 The media used on the drive has a diameter of approximately 95 mm
 (approximately 3.7 inches). The alumi-num substrate is coated with
 a thin film magnetic material, overcoated with a proprietary
 protective layer for improved durability and environmental protec-
 tion.


 Grounding
 ---------
 Signal ground (PCB) and HDA ground are connected together in the
 ST15230 drive and cannot be separated by the user. The equipment
 in which the drive is mounted is connected directly to the HDA and
 PCB with no electrically isolating shock mounts. If it is desired
 for the system chassis to not be connected to the HDA/PCB ground,
 the systems integrator or user must provide a nonconductive
 (electrically isolating) method of mounting the drive in the
 host equipment.


 DC cable and connector
 ----------------------
 The "W" and "WD" model drives receive DC power through a 4 pin
 connector mounted at the rear of the main PCB.
 Recommended part numbers of the mating connector are listed below,
 but equivalent parts may be used.


 Mating connector parts
 ----------------------
 Type of cable    Connector               Contacts (20-14 AWG)
 14 AWG           AMP 1-480424-0          AMP 60619-4 (Loose Piece)
                                          AMP 61117-4 (Strip)

 For "WC/DC" models, the DC power is routed through the SCSI 80 pin
 I/O connector. Current carrying capacity is for one drive only,
 plugged directly into the Host 80 pin I/O connector (no cable).


 Physical description
 --------------------
 The "W" and "WD" model drives may be daisy-chained with other
 compatible SCSI devices using the same type cable. Both ends of
 the cable must be terminated. The model ST15230W and ST15230WC
 drives implement single ended drivers and receivers. The ST15230WD
 and ST15230DC model drives implement differential drivers and
 receivers. All signals are common between all SCSI devices.
 The drive may be daisy-chained only with SCSI devices having the
 same type drivers and receivers. Devices having single ended
 interface circuits cannot be on the same daisy-chain with
 devices having differential interface circuit. A maximum of 16
 SCSI devices (including the Host) may be daisy-chained together.
 The SCSI Devices at both ends of the daisy-chain are to be
 terminated. Intermediate SCSI devices shall not be terminated.

 Remove the terminator enable jumper TE, not the terminator power
 source selector jumper TP.

 "WC/DC" model drives plug into PCB or bulkhead connectors in the
 Host. They may be connected in a daisy-chain by the host backplane
 wiring or PCB circuit runs that have adequate DC current carrying
 capacity to support the number of drives plugged into the PCB or
 bulkhead connectors. A single 80 pin I/O connector cannot support
 the DC current needs of several drives, no daisy-chain cables
 should be used. A single drive connected via a cable to a host
 80 pin I/O connector is not recommended.


 Single ended I/O circuits ("W/WC" models)
 -----------------------------------------
 The maximum total cable length for use with drives having single
 ended I/O driver and receiver circuits shall be 6 metres (19.7 ft.)
 when operating at line data transfer rates of 5 Mbytes/sec or less,
 and 3 metres (9.85 ft.) when operating at transfer rates greater
 than 5 Mbytes/sec (FAST SCSI). A stub length of no more than 0.1
 metre (0.33 ft.) is allowed off the mainline interconnection with
 any connected equipment. An ideal impedance match with cable
 terminators implies a cable characteristic impedance of 132 ohms.


 Differential I/O circuits ("WD/DC" models)
 ------------------------------------------
 The maximum total cable length for use with drives having
 differential I/O drivers and receiver circuits shall be 25 metres
 (82 ft.). A stub length of no more than 0.2 metre (0.66 ft.) is
 allowed off the mainline interconnection with any connected
 equipment. An ideal impedance match with cable terminators implies
 a cable characteristic impedance of 122 ohms).


 General cable characteristics
 -----------------------------
 A characteristic impedance of 100 ohm  10% is recommended for
 unshielded flat or twisted pair ribbon cable. However, most
 available cables have a somewhat lower characteristic impedance.
 To minimize discontinuances and signal reflections, cables of
 different impedance's should not be used in the same bus.
 Implementations may require trade-offs in shielding
 effectiveness, cable length, the number of loads, transfer rates,
 and cost to achieve satisfactory system operation. If shielded and
 unshielded cables are mixed within the same SCSI bus, the effect of
 impedance mismatch must be carefully considered. Proper impedance
 matching is especially important in order to maintain adequate
 margin at FAST SCSI transfer rates.


 Cable for "W" and "WD" model drives
 -----------------------------------
 Only nonshielded cable connectors are applicable. A 68 conductor flat
 cable or 34 twisted pair cable shall be used. A minimum conductor
 size of 28 AWG should be used to minimize noise effects.
 Suggested nonshielded flat cable part numbers are:
 Flat cable - 35M-3365-68
 Twisted pair - Spectra Twist in flat 455-248-68
 Equivalent parts may be used.


 Cables for "WC/DC" drive models
 -------------------------------
 The 80 pin connector option is intended for use on drives that plug
 directly into a PCB or wall/bracket mounted connector in the host
 equipment. Cable mounted connectors would not be used in such a
 case. Installations with cable mounted connectors are not
 recommended.


 Mating connector for "WC/DC" models:
 ------------------------------------
 The nonshielded mating connector shall be an 80 pin connector
 consisting of two rows of 40 male pins with adjacent pins 50 mils
 (1.27 mm) apart. The connector is keyed by virtue of its shape.


 Mating connectors for "W" and "WD" drive models
 -----------------------------------------------
 The nonshielded cable connector shall be a 68 conductor connector
 consisting of two rows of 34 female contacts with adjacent contacts
 50 mils (1.27 mm) apart.

 Recommended Mating Flat Cable Connector Part Numbers are:
 -----------+-------------------+-------------------------------------
 Closed end |Amp Model 749925-5 | (50 mil conductor centers for 28 or
 (For cable |                   | 30 AWG wire). This connector can
 ends)      |                   | only be used on cable ends. Use
            |                   | two, 34 conductor, 50 mil center
            |                   | flat cable with this connector.
 -----------+-------------------+-------------------------------------
 Open end   |Amp limite         |
            |88-5870-294-5      | W/O Strain Relief, (25 mil conductor
            |                   | centers, 30 AWG wire). Use either on
            |                   | cable ends or in cable middle
            |                   | section for daisy-chain
            |                   | installations.

 The disc drive device connector is a nonshielded 68 conductor
 connector consisting of two rows of 34 female pins with adjacent
 pins 1.27 mm (0.050 inches) apart. The connector is keyed by means
 of its shape.


 Mating connectors for "WC/DC" models
 ------------------------------------
 The nonshielded connector shall be an 80 conductor connector
 consisting of two rows of 40 contacts with adjacent contacts
 50 mils (1.27 mm) apart. The connector is keyed by its shape.

 Recommended PCB or bulkhead mounted connectors are:
 Straight-in connector (most commonly used):

 Seagate P/N: 77678703
 Amp US P/N: 2-557103-1
 Amp Japan P/N: 5-175475-9

 Right angle to PCB connector:
 Seagate P/N: 77678559
 Amp US P/N: 2-557101-1
 Amp Japan P/N: 5-175474-9


 J2 Jumper plug part number
 ---------------------------
 Option select header connector J2 on the PCB uses an unusual type
 of jumper plug, so its part number is given here for reference:

 Molex 52747-0211 (Seagate P/N 77670952).

 A bag with the two jumper types used on the drive is included with
 every standard OEM drive.


 Electrical description
 ----------------------
 Model ST15230W uses single ended interface signals. These signals
 must be terminated with 110 ohm active termination circuits at each
 end of the total cable. The terminators are enabled (or disabled) by
 installing (or removing) jumper plug TE. Single Ended circuits use
 open collector or three state drivers. The model ST15230WC uses
 single ended interface signals, but there are no provisions for
 terminators on the drive.

 Models ST15230WD and ST15230DC use differential interface signals
 and each of these must be termi-nated at each end of the total
 cable with 330 ohms to +5 V and 330 ohms to ground with 150 ohms
 between each differential pair. All I/O circuits are open
 collector, three state drivers. Differential I/O drives are
 shipped without terminators. These drives have no provisions
 for adding terminators on the PCB. On these drives some method
 of external termination must be provided by the user Systems
 Integrator or host equipment manufacturer.


 Transmitter characteristics
 ---------------------------
 Single ended drives use an ANSI SCSI compatible open collector
 single ended driver. This driver is capable of sinking a current
 of 48 mA with a low level output voltage of 0.4 volt.


 Receiver characteristics
 ------------------------
 Single ended drives use an ANSI SCSI single ended receiver with
 hysteresis gate or equivalent as a line receiver.


 Differential drivers/receivers
 ------------------------------
 The drive has no provisions for terminator circuits on differential
 I/O drives.


 Differential signals
 --------------------
 All differential interface signals consist of two lines denoted
 +SIGNAL and -SIGNAL. A signal is true when +SIGNAL is more positive
 than -SIGNAL, and a signal is false when -SIGNAL is more positive
 than +SIGNAL. All assigned signals shall be terminated at each
 end of the cable. Drive user, Systems integrator or Host equipment
 manufacturer must provide some external means of termination.


 Output characteristics
 ----------------------
 Each signal driven by differential interface drives shall have the
 following output characteristics when measured at the disc drive
 SCSI connector:

 Low-level output voltage = 2.0 V maximum at Low-level output
                          current = 55 milliamps.
 High-level output voltage = 3.0 V minimum at High-level output
                           current = -55 milliamps
 Differential voltage = 1.0 V minimum with commonmode voltage
                      ranges from -7 V dc to +12 V dc.

 The output characteristics shall additionally conform to EIA RS-485-
 1983.


 Input characteristics
 ---------------------
 Each signal received by differential interface drives shall have the
 following input characteristics when measured at the disc drive
 SCSI connector:
 Input current on either input = +2.0 milliamps maximum (includes
                               both receivers and passive drivers).

 This requirement shall be met with the input voltage varying between
 -7 V dc and +12 V dc, with power on or off, and with the hysteresis
 equaling 35 mv, minimum.

 The input characteristics shall additionally conform to EIA RS-485-
 1983.


 Terminator requirements
 -----------------------
 Internal disc drive I/O termination (provided only in single ended
 I/O model ST15230W drives) consists of active circuits in an LSI
 module that is permanently mounted on the PCB. All single initiator/
 single target (nondaisychain) applications require that the
 Initiator and disc drive be terminated. Daisy-chain applications
 require that only the units at each end of the daisy-chain be
 terminated. All other peripherals on the chain must not be
 terminated.

 Note.
 Remove drive terminator enabling jumper TE where terminators are not
 required. Removal of terminator power source selection jumper TP
 does not disconnect the terminator resistors from the circuit.

 It is highly recommended that ANSI SCSI-2 Standard's Alternative 2
 termination (active termination) be used for single-ended ST15230W
 and ST15230WC applications, especially if the bus will be operated
 at transfer rates above 5 Mbytes/sec. The ST15230W provides on-board
 active termination that can be disabled by removal of the enable
 jumper TE.

 Note
 Active terminators are highly recommended for use in the daisy-chain
 as described above. Active and passive terminators should not be
 mixed on the same SCSI bus.

 Differential I/O ST15230WD does not have terminators on the PCB.
 The user, systems integrator or host equipment manufacturer must
 provide a terminator arrangement external to the drive. Models
 ST15230WC and ST15230DC do not have terminators on the drive PCB
 and there is no provision for terminator power in the 80 pin I/O
 connector.


 Terminator power
 ----------------
 The "W/WD" model drives may be configured to accept terminator power
 from drive connector pins 17, 18, 51 and 52 of the SCSI Bus, to
 supply power to the SCSI bus or to provide terminator power for
 internal termination circuits from the drive power connector.
 The drive can provide power both to its own terminators and to
 the SCSI Bus terminators at the other end of the I/O cable if both
 "TP" jumpers are on (models ST15230W/WD only).

 SCSI devices providing terminator power (TERMPWR) shall have the
 following characteristics:

  V TERM = 4.50 V to 5.25 V
  800 mA min source drive capability
  1.0 A maximum

 The "WC" and "DC" model drives cannot furnish terminator power,
 because no conductors in the 80 pin I/O cable are devoted to
 terminator power.



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
SEAGATE  ST15230W/WD/WC/DC  PRODUCT MANUAL 77767479 REV. A  3/1995

 Scope
 -----
 This Manual describes the Seagate Technology, Inc. Hawk 4 Family Disc
 Drive. This high capacity, high performance member of the Seagate 3.5
 inch rigid disc family is a companion product to the ST12400 drive
 family. It has an embedded SCSI controller. Performance information
 is given in Section 5. The Hawk 4 Family interface is defined for
 functional compatibility to a subset of the Seagate SCSI Interface
 Specification 77738479, and the ANSI SCSI-2 and SCSI-3 standards.
 The Model Hawk 4 Family drives are classified as "Intelligent"
 peripherals. The Hawk 4 Family provides Level 2 conformance (highest
 level) with the ANSI SCSI-1 standard. Details of the Hawk 4 Family
 drive SCSI implementation are provided in Section 11 of this manual,
 (Vol. 1) and in the SCSI Interface Product Manual P/N 77738479 (Vol.
 2; Ver. 2).

 The Hawk 4 family of drives consists of the ST15230W/WD/WC/DC drives.
 From this point on in this Product Manual the reference to Hawk 4
 Family is referred to as "the drive" (unless reference to individual
 models are necessary). The drive printed circuit board is referred
 to as a PCB.


 Applicable standards and reference documentation
 ------------------------------------------------
 The drive has been developed as a system peripheral to the highest
 standards of design and construction. The drive depends upon its host
 equipment to provide adequate power and environment in order to
 achieve optimum performance and compliance with applicable industry
 and governmental regulations. Special atten-tion must be given in the
 areas of safety, power distribution, shielding, audible noise
 control, and temperature regulation. In particular, the drive must be
 securely mounted in order to guarantee the specified performance
 characteristics.


 Standards
 ---------
 The Hawk 4 Family (Wide) complies with Seagate standards as noted in
 the appropriate sections of this manual and the Seagate SCSI
 Interface Specification, P/N 77738479 (Vol. 2, Version 2).
 The Hawk 4 Family is a UL Recognized component per UL 1950 and a CSA
 Certified component per CAN/ CSA-C22.2 No. 950-M89. It also meets the
 requirements of DIN VDE 0805:1993 and EN60950: 1992 (IEC 950).
 The drive, as delivered, is designed for system integration and
 installation into a suitable enclosure prior to use. As such the
 drive is supplied as a subassembly and is not subject to Subpart J
 of Part 15 of the FCC Rules and Regulations nor the Radio
 Interference Regulations of the Canadian Department of
 Communications. However, the unit has been tested using proper
 shielding and grounding and found to be compliant with Class A
 limits of the FCC Rules and the Regulations of The Canadian
 Department of Communications.

 The physical design characteristics of the drive serve to minimize
 radiation when installed in an enclosure that provides reasonable
 shielding. As such, the drive is capable of meeting the Class B
 limits of the FCC Rules and Regulations of the Canadian Department
 of Communication. However, it is the users responsibility to assure
 that the drive meets the appropriate EMI requirements in their
 system. Shielded I/O cables may be required if the enclosure does
 not provide adequate shielding. If the I/O cables are external to
 the enclosure, shielded cables should be used, with the shields
 grounded to the enclosure and to the host controller.

 CAUTION!
 To avoid potential service problems, observe the following precau-
 tions:  The Manufacturers installed labels must not be removed from
 the drive or covered with additional labels, as they contain
 information required when servicing the product.


 Applicable reference documents
 ------------------------------
 Installation Guide Seagate P/N 77767477
 Product Manual - SCSI Interface Seagate P/N 77738479
 ANSI Small Computer System Interface (SCSI): Document Number
 ANSI3.131-1986 (X3T9/84.40 Rev. 1B) (X3T9.2/82-2 Rev. 17B),
 X3T9.2/86-109 Revision 10H (SCSI-2) and X3T9.2-184 Rev. 4 (SCSI-3).

 Seagate Package Test Requirements P/N 30190-001 (packages under 100
 lbs) Seagate Package Test Requirements P/N 30191-001 (packages over
 100 lbs).
 In case of conflict between this document and any referenced
 document, this document shall take precedence.


 General description
 -------------------
 The drives are a member of a family of low cost, high performance,
 highly reliable, random access storage devices designed to meet the
 needs of the OEM marketplace.
 The drive records and recovers data on 3.7 inch (95 mm) fixed discs.
 The drive supports the Small Computer System Interface-2 (SCSI) as
 described in the ANSI SCSI-1, SCSI-2 and SCSI-3 Interface Specifi-
 cations to the extent described in this product manual (Vol. 1),
 which defines the product performance characteristics of the Hawk
 4 Family of drives, and the SCSI Interface Product Manual P/N
 77738479 (Vol. 2, Version 2) which describes the general interface
 characteristics of this and other families of Seagate 3.5-inch
 drives. The drive interface supports multiple initiators,
 disconnect/reconnect, self configuring host software and automatic
 features that relieve the host from the necessity of knowing the
 physical characteristics of the targets (logical block addressing is
 used). The Head/Disc Assembly (HDA) is environmentally sealed at the
 factory. Air recirculates within the HDA through a nonreplaceable
 filter to maintain a contamination free head/disc environment.

 NEVER disassemble the Head/Disc Assembly (HDA). This exploded view
 is for information only. Do not attempt to service items in the
 sealed environmental enclosure (heads, media, actuator, etc.) as
 this requires special facilities. The drive contains no parts
 replaceable by the user. The drive warranty is voided if the HDA
 is opened.

 The Hawk 4 Family (Wide) drives use a dedicated landing zone at the
 innermost radius of the media to eliminate the possibility of
 destroying or degrading data by landing in the data zone. The
 drive automatically goes to the landing zone when the power is
 removed.

 The Hawk 4 Family (Wide) drives incorporate an automatic shipping
 lock which prevents potential damage to the heads and discs that
 result from movement during shipping and handling. The shipping
 lock disengages when power is applied to the drive and the head
 load process begins.

 The Hawk 4 Family (Wide) drives decode Track 0 location from the
 dedicated servo surface to eliminate mechanical transducer
 adjustments and related reliability concerns.

 The Hawk 4 Family (Wide) drives use a high performance actuator
 assembly that consists of a low inertia, balanced, patented,
 straight arm design that provides excellent performance with
 minimum power dissipation.


 Standard features
 -----------------
 - The Hawk 4 Family (Wide) has the following standard features:
 - Integrated SCSI Controller
 - Single Ended and Differential SCSI drivers and receivers
 - Asynchronous and Synchronous data transfer protocol
 - Firmware downloadable via SCSI interface
 - Selectable sector size from 256 to 4096 bytes/sector
 - Programmable sector reallocation scheme
 - Flawed sector reallocation at format time
 - Programmable auto write and read reallocation
 - Reallocation of defects on command (Post Format)
 - 96 bit Reed-Solomon error correcting code
 - Sealed Head/Disc Assembly
 - No preventative maintenance or adjustment required
 - Dedicated head landing zone
 - Automatic shipping lock
 - Automatic Adaptive Thermal Compensation
 - Patented Tri-Phase Servo with embedded Grey Code track address to
 - guarantee servo positioning.
 - Self diagnostics performed at power on
 - 1:1 Interleave
 - Zoned Bit Recording (ZBR)
 - Vertical, horizontal, or top down mounting
 - Dynamic spindle brake
 - 512 K byte data buffer
 - Permanently mounted terminators (for model ST15230W only), enabled
   by installation of a jumper plug.


 Performance
 -----------
 - Programmable multi-segmentable cache buffer
 - 5411 r/min Spindle.
 - Average latency = 5.54 ms
 - Command Queuing of up to 64 commands per initiator
 - Background processing of queue
 - Supports start and stop commands
 - Low audible noise for office environment
 - Low power consumption


 Reliability
 -----------
 - 800,000 hour MTBF
 - Adaptive seek velocity.
 - Improved seek performance
 - LSI circuitry
 - Balanced low mass rotary voice coil actuator
 - 5 year warranty


 Formatting
 ----------
 It is not necessary to low level format this drive. The drive is
 shipped from the factory low level formatted in 512 byte sectors.
 Reformat the drive if one of the following occurs.

 - A different sector size is selected.
 - A different spare sector allocation scheme is selected.

 High level format the drive. This involves assigning one or more
 partitions or logical drives to the drive volume. Follow the
 instructions in the system manuals for the system into which the
 drive is to be installed.


 Start/stop time
 ---------------
 After DC power has been applied, the drive becomes ready within 25
 seconds if the Motor Start Option is disabled (i.e. the motor starts
 as soon as the power has been applied). During this time the drive
 responds to some commands over the SCSI interface* in less than 3
 seconds. Stop time is less than 20 seconds from removal of DC power.
 If the Motor Start Option is enabled the internal controller accepts
 the commands listed in the SCSI Interface Product Manual less than 3
 seconds after DC power has been applied. After the Motor Start
 Command has been received the drive becomes ready for normal
 operations within 25 seconds. The Motor Start Command can also be
 used to command the drive to stop the spindle.

 There is no power control switch on the drive.


 Prefetch/multi-segmented cache control
 --------------------------------------
 The drive provides prefetch (read look-ahead) and multi-segmented
 cache control algorithms that in many cases can enhance system
 performance. "Cache" as used herein refers to the drive buffer
 storage space when it is used in "cache" operations. To select
 prefetch and cache features the host sends the Mode Select command
 with the proper values in the applicable bytes in Mode Page 08h.
 Prefetch and cache operation are independent features from the
 standpoint that each is enabled and disabled independently via
 the Mode Select command. However, in actual operation the prefetch
 feature overlaps cache operation.


 Cache operation
 ---------------
 In general, 448 Kbytes of the 512 Kbytes of physical buffer space in
 the drive can be used as storage space for cache operations. The
 buffer can be divided into logical segments (Mode Select Page 08h,
 byte 13) from which data is read and to which data is written. The
 drive maintains a table of logical block disk medium addresses of
 the data stored in each segment of the buffer. If cache operation
 is enabled (RCD bit = 0 in Mode Page 08h, byte 2, bit 0. See SCSI
 Interface Product Manual), data requested by the host with a Read
 command is retrieved from the buffer (if it is there), before any
 disc access is initiated. If cache operation is not enabled, the
 buffer (still segmented with required number of segments) is still
 used, but only as circular buffer segments during disc medium read
 operations (disregarding Prefetch operation for the moment). That
 is, the drive does not check in the buffer segments for the
 requested read data, but goes directly to the medium to retrieve
 it. The retrieved data merely passes through some buffer segment
 on the way to the host. For a cache miss, all data transfers to
 the host are in accordance with "buffer-full" ratio rules. On a
 cache hit the drive ignores the buffer full ratio. See
 explanations associated with Mode page 02h (disconnect/reconnect
 control) in the SCSI Interface Product Manual.

 The following is a simplified description of a read operation with
 cache operation enabled:

 Case A - A Read command is received and the first logical block (LB)
 is already in cache:
  1. Drive transfers to the initiator the first LB requested plus all
     subsequent contiguous LB's that are already in the cache. This
     data may be in multiple segments.
  2. When the requested LB is reached that is not in any cache
     segment, the drive fetches it and any remaining requested LB's
     from the disc and puts them in a segment of the cache. The drive
     transfers the remaining requested LB's from the cache to the
     host in accordance with the disconnect/reconnect specification
     mentioned above.
  3. If the prefetch feature is enabled, refer to section 5.5.2 for
     operation from this point.

 Case B - A Read command requests data, the first LB of which is not
 in any segment of the cache:
 1. The drive fetches the requested LB's from the disc and transfers
    them into a segment, and from there to the host in accordance
    with the disconnect/reconnect specification referred to in case A.
 2. If the prefetch feature is enabled, refer to section 5.5.2 for
    operation from this point. Each buffer segment is actually a self-
    contained circular storage (wraparound occurs), the length of
    which is an integer number of disc medium sectors. The wraparounds
    capability of the individual segments greatly enhances the
    buffer's overall performance as a cache storage, allowing a
    wide range of user selectable configurations, which includes
    their use in the prefetch operation (if enabled), even when
    cache operation is disabled.
    The number of segments may be selected using the Mode Select
    command, but the size can not be directly selected. Size is
    selected only as a by-product of selecting the segment number
    specification. The size in Kbytes of each segment is reported
    by the Mode Sense command page 08h, bytes 14 and 15. If a size
    specification is sent by the host in a Mode Select command
    (bytes 14 and 15) no new segment size is set up by the drive,
    and if the "STRICT" bit in Mode page 00h (byte 2, bit 1) is set
    to one, the drive responds as it does for any attempt to change
    unchangeable parameters (see SCSI I/O Product Manual).
    The ST15230 family of drives supports operation of any integer
    number of segments from 1 to 16.


 Prefetch operation
 ------------------
 If the Prefetch feature is enabled, data in contiguous logical
 blocks on the disc immediately beyond that which was requested
 by a Read command can be retrieved and stored in the buffer for
 immediate transfer from the buffer to the host on subsequent
 Read commands that request those logical blocks (this is true
 even if "cache" operation is disabled). Though the prefetch
 operation uses the buffer as a "cache", finding the requested
 data in the buffer is a prefetch "hit", not a "cache" operation
 "hit". Prefetch is enabled using Mode Select page 08h, byte 12,
 bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch.
 Since data that is prefetched replaces data already in some buffer
 segment(s), the host can limit the amount of prefetch data to
 optimize system performance.

 The max prefetch field (bytes 8 and 9) limits the amount of prefetch.
 The drive does not use the prefetch "ceiling field" (bytes 10 and
 11).

 During a prefetch operation, the drive crosses a cylinder boundary to
 fetch more data only if the Discontinuity (DISC) bit is set to one in
 bit 4 of byte 2 of Mode parameters page 08h.

 Whenever prefetch (read look-ahead) is enabled (enabled by DRA = 0),
 it operates under the control of ARLA (Adaptive Read Look-Ahead).
 If the host uses software interleave, ARLA enables prefetch of
 contiguous blocks from the disk when it senses that a prefetch
 "hit" will likely occur, even if two consecutive read operations
 were not for physically contiguous blocks of data (e.g. "software
 interleave"). ARLA disables prefetch when it decides that a prefetch
 "hit" will not likely occur. If the host is not using software
 interleave, and if two sequential read operations are not for
 contiguous blocks of data, ARLA disables prefetch, but as long as
 sequential read operations request contiguous blocks of data, ARLA
 keeps prefetch enabled.


 Write errors
 ------------
 Write errors can occur as a result of media defects, environmental
 interference, or equipment malfunction. Therefore, write errors are
 not predictable as a function of the number of bits passed.

 If an unrecoverable write error occurs because of an equipment
 malfunction in the drive, the error is classi-fied as a failure
 affecting MTBF. Unrecoverable write errors are those which cannot
 be corrected within two attempts at writing the record with a read
 verify after each attempt (excluding media defects).


 Seek errors
 -----------
 A seek error is defined as a failure of the drive to position the
 heads to the addressed track. There shall be no more than one
 recoverable seek error in 10 7 physical seek operations. After
 detecting an initial seek error, the drive automatically reseeks
 to the addressed track up to 3 times. If a reseek is successful,
 the Extended Sense reports a seek positioning error (15h), no seek
 complete error (02h), or track follow error (09h), and the sense
 key reports a recovered error (1h). If all three reseeks fail, a
 seek positioning error (15h) is reported with a Medium (3h) or
 Hardware error (4h) reported in the Sense Key. This is an
 unrecoverable seek error. Unrecoverable seek errors are classified
 as failures for MTBF calculations. Ref. section 5.1.1.2 of SCSI-2
 Interface Product Manual P/N 77738479 for Request Sense command
 information.


 Preventive maintenance
 ----------------------
 No routine scheduled preventive maintenance shall be required.


 Service life
 ------------
 The drive shall have a useful service life of five years. Depot
 repair or replacement of major parts is permitted during the
 lifetime.


 Service philosophy
 ------------------
 Special equipment is required to repair the drive HDA. In order to
 achieve the above service life, repairs must be performed only at a
 properly equipped and staffed service and repair facility.
 Troubleshooting and repair of PCBs in the field is not recommended,
 because of the extensive diagnostic equipment required for effective
 servicing. Also, there are no spare parts available for this drive.
 Drive warranty is voided if the HDA is opened.


 Defect and error management
 ---------------------------
 The drive, as delivered, complies with this specification. The read
 error rate and specified storage capacity are not dependent upon use
 of defect management routines by the host (initiator).

 Defect and error management in the SCSI system involves the drive
 internal defect/error management and SCSI systems error
 considerations (errors in communications between Initiator and
 the drive). Tools for use in designing a defect/error management
 plan are briefly outlined in this section, with references to other
 sections where further details are given.


 Options
 -------
 All options are incorporated or packaged at the manufacturing
 facility.


 Front panel
 -----------
 The normal front panel available is black plastic. Other panel
 colors may be special ordered. Each panel has a single rectangular
 green LED indicator lens which, when glowing, indicates the drive
 is selected.


 Single unit shipping pack
 -------------------------
 The drive is normally shipped in bulk packaging to provide maximum
 protection against transit damage. Units shipped individually
 require additional protection as provided by the single unit
 shipping pack. Users planning single unit distribution should
 specify this option.



**********************************************************************
                      G   E   N   E   R   A   L
**********************************************************************
SEAGATE   SUPPORT SERVICES

 Seagate Technology
 ------------------
 Technical Support Services
 If you need assistance installing your drive, consult your dealer.
 Dealers are familiar with their unique system configurations and can
 help you with system conflicts and other technical issues. If you
 need additional assistance with your Seagate(r) drive or other
 Seagate products, use one of the Seagate technical support services
 listed below.

 SeaFONE at 1-800-SEAGATE (1-800-732-4283)
 Seagate's 800 number allows toll-free access to automated self-help
 services, providing answers to commonly asked questions,
 troubleshooting tips and specifications for disc drives and tape
 drives. This service is available 24 hours daily and requires a
 touch-tone phone. If you need to speak to a technical support
 engineer, dial this number and listen to the options for technical
 support. (International callers can also reach this automated
 self-help service by dialing 408-456-4496).


 Seagate Technology online services
 Using a modem, you can obtain troubleshooting tips, free utility
 programs, drive specifications and jumper settings for Seagate's
 entire product line. You can also download software for installing
 and analyzing your drive.

 SeaNET
 You can obtain technical information on Seagate drives, Seagate
 software and much more over the Internet from Seagate's World Wide
 Web home page (http://www.seagate.com) or Seagate's ftp server
 (ftp://ftp.seagate.com).

 You may also send E-mail with your questions to DiscSupport@
 Seagate.com or TapeSupport@Seagate.com.


 SeaBOARD
 SeaBOARD is a computer bulletin board system (BBS) that contains
 information about Seagate's disc and tape drive products and is
 available 24 hours daily. Set your communications software to eight
 data bits, no parity and one stop bit (8-N-1). SeaBOARD phone numbers
 are listed in the following table.

 BBS Location           Modem number
 United States      Disc: 408-434-1080; Tape: 408-456-4415
 England            44-1628-478011
 France                         33 1-48 25 35 95
 Germany            49-89-140-9331
 Singapore          65-292-6973
 Thailand           662-531-8111
 Australia          61-2-9756-2359
 Taiwan             886-2-719-6075

 Seagate CompuServe forum
 Online technical support for Seagate products is available on
 CompuServe. To access our technical support forum, type go seagate.
 This forum provides information similar to that found on SeaBOARD.
 In addition, you can type questions or browse through previous
 questions and answers on the forum messages.

 Seagate Technology FAX services
 SeaFAX
 You can use a touch-tone telephone to access Seagate's automated FAX
 system to receive technical support information by return FAX. This
 service is available 24 hours daily.
 Location               Telephone number
 United States          1-800-SEAGATE or 408-456-4496
 England                44-1628-894084
 Australia              61-2-9756-5170

 Seagate technical support FAX
 You can FAX questions or comments to technical support specialists 24
 hours daily. Responses are sent during business hours.
 Location               FAX number
 United States          408-944-9120
 England                        44-1628-890660
 France                 33 1-46 04 42 50
 Germany                        49-89-1430-5100
 Australia              61-2-9725-4052
 Singapore              65-293-4722
 Hong Kong              852-2368 7173
 Taiwan                 886-2-715-2923
 Korea                          82-2-556-7294/4251


 Seagate technical support
 You can talk to a technical support specialist during business hours
 Monday through Friday for one-on-one technical help.  Before calling,
 note your system configuration and drive model number (STxxxx). There
 are several technical support phone numbers available for various
 Seagate products.

 Location          Telephone  number
 United States Please dial 1-800-SEAGATE for the specific product
               telephone number.
               (6:00 A.M. to 11:15 A.M., 12:30 P.M. to 5:00 P.M.,
               Pacific time, M-F)
 England       44-1628-894083 (10:00 A.M. to 1:00 P.M., 2:00 P.M. to
               5:00 P.M., M-F)
 France        33 1-41 86 10 86 (9:30 A.M. to 12:30 P.M., 2:00
               P.M. to 5:00 P.M., M-F)
 Germany       Disc: 49-89-140-9332; (9:30 A.M. to 12:30 P.M., 2:00
               P.M. to 4:00 P.M., M-F)
               Tape: 49-89-140-9333
 Australia     61-2-9725-3366 (9:00 A.M. to 5:00 P.M., M-F)
 Singapore     65-290-3998 (9:00 A.M. to 12:00 P.M., 2:00
               P.M. to 5:00 P.M., M-F)
 Hong Kong     852-2368 9918
 Taiwan        886-2-514-2237
 Korea         82-2-556-8241


 SeaTDD 408-944-9121
 Using a telecommunications device for the deaf (TDD), you can send
 questions or comments 24 hours daily and exchange messages with a
 technical support specialist between 6:00 A.M. to 11:15 A.M. and
 12:30 P.M. to 5:00 P.M. (Pacific time) Monday through Friday.


 Customer Service Centers
 Seagate direct OEM, Distribution, System Integrator and Retail
 customers should contact your Seagate Service Representative for
 warranty information.  Other customers contact your place of
 purchase.  Seagate offers comprehensive customer support for all
 Seagate drives.  Seagate customer service centers are the only
 facilities authorized to service Seagate drives. These services are
 available worldwide.

 Location                       Telephone number                FAX number
 United States          1-800-468-3472;                 405-949-6740
 Other Americas
 (Canada & Brazil)      405-949-6706;               405-949-6738
 Mexico                         525-546-6965;                   525-546-4888
 Europe, Middle
 East & Africa          31-2065-43300;              31-2065-34320
 Asia Pacific &
 Australia              65-485-3595;                    65-485-4980
 Japan                          81-3-5462-2904;                 81-3-3462-2979


 Seagate, Seagate Technology and the Seagate logo are registered
 trademarks of Seagate Technology, Inc. SeaFAX, SeaFONE, SeaBOARD,
 SeaTDD, SeaNET, Medalist and DiscWizard are either trademarks or
 registered trademarks of Seagate Technology, Inc. or one of its
 subsidiaries. All other trademarks or registered trademarks are the
 property of their respective owners.


