
S T 4 2 3 4 5 1 W D     E L I T E   2 3    SEAGATE
                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders    6884|     |     |
Capacity form/unform 23200/      MB        Heads          28|     |     |
Seek time   / track  13.0/ 1.5 ms          Sector/track     |     |     |
Controller           SCSI3 DI/WI/ULTRA     Precompensation
Cache/Buffer          2048 KB MULTI-SEGMEN Landing Zone
Data transfer rate   11.000 MB/S int       Bytes/Sector      512
                     40.000 MB/S ext SYNC
Recording method     PRML 0/4/4                     operating  | non-operating
                                                  -------------+--------------
Supply voltage                  Temperature *C         5 50    |
Power: sleep              W     Humidity     %                 |
       standby            W     Altitude    km                 |
       idle          22.0 W     Shock        g                 |
       seek          27.0 W     Rotation   RPM      5400
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h     800000
                                Warranty Month        60
Lift/Lock/Park     YES          Certificates                                  

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                        L   A   Y   O   U   T
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SEAGATE  ST423451N/W/WD  INSTALLATION GUIDE 83329130 REV. A

  +---------------------------------------------------------++-+J4B
  |                                                         |+-1
  |                                                         |XX
  |                                                         |XX Power
  |                                                         |XXI
  |                                                         |XXN
  |                                                 4-3     |XXT
  |                                                 +-1 J01 |XXE
  |                                                         |XXR
  |                                                         |XXF
  |                                                         |XXA
  |                                                         |XXC
  |                                                         |XXE
  |                                                         |+-+
  |                                                         || | J4A
  |                                                         || |
  |                                                         || |
  |                                                         || |
  +---------------------------------------------------------++-1



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
SEAGATE  ST423451N/W/WD  INSTALLATION GUIDE 83329130 REV. A

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

 SCSI ID
 -------
 Each device on the SCSI chain must have a unique SCSI ID. The host
 system's SCSI controller usually uses the ID that has the highest
 priority interrupt in the SCSI I/O system. This is always ID7. ID0 is
 lowest priority in an 8-bit I/O system. ID8 is lowest priority in a
 16-bit I/O system. The lower priority SCSI IDs are normally used for
 other SCSI devices such as this Elite disc drive.

 NOTE! Most SCSI controllers (host adapters) allow you to skip a SCSI
 ID. For example, you can have ID0, ID1, and ID3 (skipping ID2). Other
 controllers do not allow this so be sure to refer to your system or
 controller user's manual for details about its requirements for
 proper SCSI device installation.

 NOTE! This drive is a SCAM (SCSI Configured Auto Magically) compliant
 drive. If the system into which you are installing this drive
 requires SCAM compliant drives, you do not need to be concerned about
 the drive ID jumper settings, as the system automatically assigns
 your new drive the ID it wants it to have. The system may or may not
 use the existing drive ID jumper settings. Setting the drive ID
 doesn't hurt anything, but is not necessary in a SCAM compliant
 system.

 Most Elite 23 disc drives are factory set with the SCSI ID set at 0.
 To change the SCSI ID, refer to the appropriate drive section for
 your model.

 If, after completing the installation process, the drive's LED does
 not show on/off activity when the host is trying to communicate with
 the drive, a duplicate SCSI ID may be the problem. If this is the
 case, change the ID so that each device on the SCSI chain has its own
 unique ID. Also check your system or controller user's manual to
 ensure that you have not violated its SCSI ID numbering
 recommendations.


 Drive termination
 -----------------
 If you are installing a Elite 23 drive in a system that has other
 SCSI devices installed, terminate only the end devices on the SCSI
 chain. A SCSI "device" is any disc drive, scanner, tape backup unit,
 or other piece of hardware connected to your system using the SCSI
 bus.

 NOTE! Some controllers prefer to remain terminated even if they are
 in the middle of the chain. Also, some controllers treat the internal
 and external chains as separate logical buses. This means you may
 need to terminate both the first and last devices on both logical
 buses to achieve proper termination. If necessary, refer to your
 system or controller documentation to see how this is handled in your
 particular system.


 Terminator power
 ----------------
 You usually will not need to change this option and can normally
 leave the drive configured as it was shipped from the factory. For
 information about how to change the terminator power option on your
 drive, refer to the appropriate drive-specific section.


 I/O circuits and data path widths
 ---------------------------------
 - WD models use differential I/O circuits. You cannot mix these
   models with single-ended models (N, W) on the same SCSI bus. The
   circuits are incompatible with each other.

 - W and WD, models have a "wide" (16-bit) SCSI data bus rather than
   the standard (non-wide) 8-bit SCSI data bus; how-ever, you can use
   these wide drives on a standard (non-wide) 8-bit data bus.


 SCSI ID jumpers (N models)
 --------------------------
 Use the J4A connector to set the SCSI ID on model ST423451N. To
 change the SCSI ID, install jumpers on the appropriate pins as shown.

  +-J4A-------------------+
  |o       o o   o o o   o|   SCSI ID 0 default
  |1       o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |o     X o o   o o o   o|   SCSI ID 1
  |1     X o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |o   X   o o   o o o   o|   SCSI ID 2
  |1   X   o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |o   X X o o   o o o   o|   SCSI ID 3
  |1   X X o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |o X     o o   o o o   o|   SCSI ID 4
  |1 X     o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |o X   X o o   o o o   o|   SCSI ID 5
  |1 X   X o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |o X X   o o   o o o   o|   SCSI ID 6
  |1 X X   o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |o X X X o o   o o o   o|   SCSI ID 7
  |1 X X X o o   o o o   o|
  +-----------------------+


 SCSI ID jumpers (W models)
 --------------------------
 Use the J4A connector to set the SCSI ID on model ST423451W/WD. To
 change the SCSI ID, install jumpers on the appropriate pins as shown.

  +-J4A-------------------+
  |        o o   o o o   o|   SCSI ID 0 default
  |1       o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |      X o o   o o o   o|   SCSI ID 1
  |1     X o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |    X   o o   o o o   o|   SCSI ID 2
  |1   X   o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |    X X o o   o o o   o|   SCSI ID 3
  |1   X X o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |  X     o o   o o o   o|   SCSI ID 4
  |1 X     o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |  X   X o o   o o o   o|   SCSI ID 5
  |1 X   X o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |  X X   o o   o o o   o|   SCSI ID 6
  |1 X X   o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |  X X X o o   o o o   o|   SCSI ID 7
  |1 X X X o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |X       o o   o o o   o|   SCSI ID 8
  |X       o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |X     X o o   o o o   o|   SCSI ID 9
  |X     X o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |X   X   o o   o o o   o|   SCSI ID 10
  |X   X   o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |X   X X o o   o o o   o|   SCSI ID 11
  |X   X X o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |X X     o o   o o o   o|   SCSI ID 12
  |X X     o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |X X   X o o   o o o   o|   SCSI ID 13
  |X X   X o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |X X X   o o   o o o   o|   SCSI ID 14
  |X X X   o o   o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |X X X X o o   o o o   o|   SCSI ID 15
  |X X X X o o   o o o   o|
  +-----------------------+


 Terminating the drive
 ---------------------
 ST423451N drives are terminated with permanently mounted IC active
 terminators. If you install one of these drives and it is not on the
 end of the SCSI bus, disable the terminators by removing the TE
 jumper from pins 19 and 20 of connector J4A. If you install the drive
 on the end of the SCSI bus, enable termination by installing a
 jumper on pins 19 and 20 of connector J4A.

  +-J4A-------------------+
  |o o o o o o   o o X   o| Terminator Enabled
  |1 o o o o o   o o X   o|
  +-----------------------+
  +-J4A-------------------+
  |o o o o o o   o o     o| Terminator Disabled
  |1 o o o o o   o o     o|
  +-----------------------+


 Terminating the drive (W models)
 --------------------------------
 ST423451W drives are terminated with permanently mounted IC active
 terminators. If you install one of these drives and it is not on the
 end of the SCSI bus, disable the terminators by removing the TE
 jumper from pins 19 and 20 of connector J4A. If you install the drive
 on the end of the SCSI bus, enable termination by installing a
 jumper on pins 19 and 20 of connector J4A.

 NOTE
 Use active (ANSI SCSI-2 Alternative 2) terminators when terminating
 the bus.

 ST423451WD drives do not have internal terminators or any other way
 of adding internal termination to the drive. You must provide
 external differential termination to these drives when termination
 is required.

  +-J4A-------------------+
  |o o o o o o   o o X   o| Terminator Enabled
  |1 o o o o o   o o X   o|
  +-----------------------+
  +-J4A-------------------+
  |o o o o o o   o o     o| Terminator Disabled
  |1 o o o o o   o o     o|
  +-----------------------+


 Terminator power (N models)
 ---------------------------
 There are three possible terminator power configurations for
 ST423451N drives. You will not normally need to change this option
 and can leave the drive configured as it was shipped from the
 factory.

  2---4
  |X o|J01  Internal terminator power source.
  |X o|
  1---3

  2---4
  |xxx|J01  External terminator power source.
  |o o|
  1---3

  2---4
  |xxx|J01  Internal terminator and drive power to I/O.
  |xxx|
  1---3


 Terminator power (W models)
 ---------------------------
 There are three possible terminator power configurations for
 ST423451W drives. You will not normally need to change this option
 and can leave the drive configured as it was shipped from the
 factory.

 There are two possible terminator power configurations for ST423451W
 drives.

  2---4
  |X o|J01  Internal terminator power source.
  |X o|
  1---3

  2---4
  |xxx|J01  External terminator power source.
  |o o|
  1---3

  2---4
  |xxx|J01  Internal terminator and drive power to I/O.
  |xxx|
  1---3


 J4B Other applicable jumper options (N models)
 ----------------------------------------------

 Spin Delay Option
 -----------------
 +-------+
 |  o o o| Immediate spinup (if the Start Command option jumper is
 |  o o o| disconnected)
 1-------+
 +-------+
 |X o o o| Spinup delay equal to the SCSI Bus ID multiplied by 12
 |X o o o| seconds (if the Start Command option jumper is
 1-------+ disconnected)


 Start Command Option
 --------------------
 +-------+
 |o   o o| Start spindle according to the Spinup Delay option jumper
 |o   o o|
 1-------+
 +-------+
 |o X o o| Start spindle after the SCSI Bus sends a Start Unit command
 |o X o o|
 1-------+


 SCSI Bus Parity Check
 ---------------------
 +-------+
 |o o   o| Check the parity of data bytes read from the SCSI Bus
 |o o   o|
 1-------+
 +-------+
 |o o X o| Ignore parity check
 |o o X o|
 1-------+


 +-------+
 |o o o  | RESERVED
 |o o o  |
 1-------+


 J4B Other applicable jumper options (W models)
 ----------------------------------------------

 Spin Delay Option
 -----------------
 +-------+
 |  o o o| Immediate spinup (if the Start Command option jumper is
 |  o o o| disconnected)
 1-------+
 +-------+
 |X o o o| Spinup delay equal to the SCSI Bus ID multiplied by 12
 |X o o o| seconds (if the Start Command option jumper is
 1-------+ disconnected)


 Start Command Option
 --------------------
 +-------+
 |o   o o| Start spindle according to the Spinup Delay option jumper
 |o   o o|
 1-------+
 +-------+
 |o X o o| Start spindle after the SCSI Bus sends a Start Unit command
 |o X o o|
 1-------+


 SCSI Bus Parity Check
 ---------------------
 +-------+
 |o o   o| Check the parity of data bytes read from the SCSI Bus
 |o o   o|
 1-------+
 +-------+
 |o o X o| Ignore parity check
 |o o X o|
 1-------+


 +-------+
 |o o o  | RESERVED
 |o o o  |
 1-------+


 Active, Ready, and Fault Indicators (W/N Models)
 ------------------------------------------------
  +-J4A-------------------+
  |o o o o o     o o o   o|  RESERVED
  |1 o o o o     o o o   o|
  +-----------------------+
  +-J4A-------------------+
  |o o o o o o   o o X   o|  Terminator Enabled
  |1 o o o o o   o o X   o|
  +-----------------------+
  +-J4A-------------------+
  |o o o o o o   o o o    |  RESERVED
  |1 o o o o o   o o o    |
  +-----------------------+

  +-J4A-------------------+
  |o o o o o o +-* o o   o|
  |1 o o o o o |+* o o   o|
  +------------++---------+
  +-J4A--------++---------+
  |o o o o o o ||o+* o   o|
  |1 o o o o o ||o|*+o   o|
  +------------++-+-+-----+
               ++-+-+-----------------------xxxxxx Active LED
                *-+-+-----------------------xxxxXX
                | | |                       Cath
                | | +-----------------------xxxxxx Fault LED
                *-+-------------------------xxxxXX
                | |                         Cath
                | +-------------------------xxxxxx Ready LED
                +---------------------------xxxxXX
                                            Cath

 NOTE
 On some LEDs the flat side of indicator is cathode!



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                      I   N   S   T   A   L   L
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SEAGATE  ST423451N/W/WD  INSTALLATION GUIDE 83329130 REV. A

 Notes on Installation
 =====================

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

     horizontally                           vertically
   +-----------------+             +--+                       +--+
   |                 |             |  +-----+           +-----+  |
   |                 |             |  |     |           |     |  |
 +-+-----------------+-+           |  |     |           |     |  |
 +---------------------+           |  |     |           |     |  |
                                   |  |     |           |     |  |
                                   |  |     |           |     |  |
 +---------------------+           |  +-----+           +-----+  |
 +-+-----------------+-+           +--+                       +--+
   |                 |
   |                 |
   +-----------------+

 The drive will operate in all axis (6 directions).


 Orientation
 -----------
 We recommend orienting the drive or directing the air flow in a way
 that creates the least amount of air-flow resistance while providing
 air flow above the circuit boards and around the head and disc
 assembly (HDA). Also, choose the shortest possible path between the
 air inlet and exit. This minimizes the distance traveled by air that
 is heated by the drive and by other nearby heat sources.

 The air-flow patterns can be created by the fans either pushing or
 drawing air. The overall flow pattern can be directed from front to
 back, back to front, or side to side.


 Mounting the drive and connecting cables
 ----------------------------------------
 Do not touch the connector pins or any components on the control
 board without observing static-discharge precautions.

 Always handle the drive by the frame only.

 The drive may be mounted in any orientation (horizontally,
 vertically, and any combination thereof); however, you must ensure
 that the drive receives adequate air flow for cooling.

 1. Mount the drive to the host system's chassis using four 6-32 UNC
    screws. Two mounting holes are in each side of the HDA and there
    are four mounting holes in the bottom of the HDA. The maximum
    length that the screws should extend into the HDA mounting holes
    is 0.17 inch (4.318 mm), measured from the outer surface of the
    HDA. Tighten the screws down evenly. Do not over-tighten or force
    the screw if it does not seem to screw in easily, because this
    means the threads are not properly aligned. In this case, back the
    screw out and try again.

 2. Verify that all connections between the drive and the host system
    are correctly installed.

 3. Verify that you have correctly installed jumpers.

 4. Connect the SCSI cable into the drive's SCSI connector. Take care
    not to stretch or crimp this cable, and do not block the system's
    cooling air flow with the cable. The drive receives DC power
    through a 4-pin connector mounted next to the SCSI connector. The
    output of a power supply must meet SELV (safety extra low voltage)
    as defined in IEC 950. To connect the DC power cable to the drive,
    simply insert the cable end into the drive's DC power connector.

 Note. Signal ground on the printed circuit board assembly (PCB) and
       the head and disc assembly (HDA) are connected together in
       this drive and you cannot separate them. Ensure the equipment
       in which you have mounted the drive is connected directly to
       the HDA. Maximizing the conductive contact area between HDA
       ground and system ground may reduce radiated emissions.

 If you do not want the system chassis to be connected to the HDA/PCB
 ground, you must provide a nonconductive (electrically isolating)
 method of mounting the drive in the host system. This may increase
 radiated emissions and is the system designer's responsibility.

 5. Replace the host system's cover.



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
SEAGATE  ST423451N/W/WD  INSTALLATION GUIDE 83329130, REV. A


 This manual contains information for users of the Seagate
 ST423451 Elite 23 SCSI disc drives.

 It provides support services, performance specifications, and initial
 setup information.


 Electrostatic discharge protection
 ----------------------------------
 Caution
 Removal of circuit boards by personnel not performing depot repair
 will damage components and may void the warranty.

 All drive electronic assemblies are sensitive to static electricity,
 due to the electrostatically sensitive devices used within the drive
 circuitry.

 Although some devices such as metal-oxide semiconductors are
 extremely sensitive, all semiconductors, as well as some resistors
 and capacitors, may be damaged or degraded by exposure to static
 electricity.

 Electrostatic damage to electronic devices may be caused by the
 direct discharge of a charged conductor or by exposure to the static
 fields surrounding charged objects. To avoid damaging drive
 electronic assemblies, observe the following precautions when
 installing or servicing the drive:

 - Ground yourself to the drive whenever the drive electronics are or
   will be exposed. Connect yourself to ground with a wrist strap
   (Seagate part number 12263496). Connection may be made to any
   grounded metal assembly. As a general rule, remember that you and
   the drive electronics must all be grounded to avoid potentially
   damaging static discharges.

 - Turn off the power before removing or installing the DC power
   cable.

 - Do not remove any circuit boards from the drive.

 - Never use an ohmmeter on any circuit boards.

 - When installing the drive on a carrier or tray, discharge the
   carrier or tray prior to inserting it into the system.


 Important safety information and precautions
 --------------------------------------------
 Caution
 Use forced-air ventilation when bench-testing the drive to ensure
 proper cooling of drive components.

 Use proper safety techniques for safe, reliable operation of this
 unit.

 The procedures in this manual and labels on the unit contain warnings
 and cautions that must be carefully read and followed to minimize or
 eliminate the risk of personal injury. The warnings point out
 conditions or practices that may endanger you or others. The
 cautions point out conditions or practices that may damage the unit,
 possibly making it unsafe for use.

 Always observe the following warnings and precautions:

 - Follow all cautions and warnings in the procedures.

 - Use sound safety practices when operating, installing, or removing
   the unit.

 - Use caution when troubleshooting a unit that has voltages present.
   Turn off power to the unit before removing it.

 - Ensure that the internal temperature of the rack or cabinet does
   not exceed the limits defined for the drive when the drive is
   mounted in an equipment rack or cabinet. When units are stacked
   vertically, pay special attention to the top where temperatures
   are usually highest.

 - Follow the precautions listed above in "Electrostatic discharge
   protection."

 - Do not remove any circuit boards from the drive. Return the entire
   drive for depot repair if any circuit board is defective. Removal
   of circuit boards by personnel not performing depot repair will
   damage components and may void the warranty.

 - Return the entire drive for depot repair if the HDA is defective.

 - Do not attempt to disassemble the HDA. It is not field repairable.
   If the sealed HDA is opened by personnel not performing depot
   repair, this will damage components and void the warranty.

 As a component, this drive is designed to be installed and operated
 in accordance with UL1950, EN60950, CSA C22.2 950-M89, and VDE0805.
 Seagate takes all reasonable steps to ensure that its products are
 certifiable to currently accepted standards. Typical applications of
 these disc drives include customer packaging and subsystem design.
 Safety agencies conditionally certify component assemblies, such as
 the Elite disc drive, based on their final acceptability in the
 end-use product. The subsystem designers are responsible for meeting
 these conditions of acceptability in obtaining safety-regulatory
 agency compliance in their end-use products and for certifying where
 required by law. A necessary part of meeting safety requirements is
 the provision for overcurrent protection on drive SELV supply
 voltages.

 This unit is a component part and as such is not meant to comply with
 FCC or similar national requirements as a stand-alone unit.
 Engineering radiated emissions test results are available through the
 Seagate Safety Department to assist the subsystem designer.

 European Union Compliance If this model has the CE Marking, it
 complies with the European Union requirements of the Electromagnetic
 Compatibility Directive 89/336/EEC of 03 May 1989 as amended by
 Directive 92/ 31/EEC of 28 April 1992 and Directive 93/68/EEC of 22
 July 1993.

 Seagate uses an independent laboratory to confirm compliance to the
 above directives. The drive was tested in a representative system for
 typical applications. The selected system represents the most popular
 characteristics for test platforms. The system configurations
 include:

 - 486, Pentium, and PowerPC Microprocessors

 - 3.5-inch Floppy Disc Drive

 - Keyboard

 - Monitor/Display

 Although the test system with this Seagate model complies to the
 directives, we cannot guarantee that all systems will comply. The
 computer manufacturer or system integrator shall confirm EMC
 compliance and provide CE Marking for their product.


 General description
 --------------------
 Elite 23 SCSI disc drives are high-speed, random-access digital-data
 storage devices.

 The drive is a component for installation in an enclosure designed
 for the drive. This is often a rack within the system or an external
 enclosure designed to house one or more disc drives or other
 peripheral units. In either case, the disc drive must receive
 adequate cooling (refer to "Providing adequate cooling") and it must
 be sufficiently grounded and shielded from emissions. The Elite 23
 Product Manual (part number 83329140) contains guidelines for a
 properly designed enclosure.


 Providing adequate cooling
 --------------------------
 The enclosure design must ensure adequate cooling for the drive. The
 maximum ambient temperature is 50*C. The drive's product manual
 (83329140) describes how to evaluate the air-flow design. The
 evaluation consists of ensuring that the case temperature of certain
 critical components remains within acceptable limits during drive
 operation.

 We recommend orienting the drive or directing the air flow in a way
 that creates the least amount of air-flow resistance while providing
 air flow above the circuit boards and around the head and disc
 assembly (HDA). Also, choose the shortest possible path between the
 air inlet and exit. This minimizes the distance traveled by air that
 is heated by the drive and by other nearby heat sources.

 The air-flow patterns can be created by the fans either pushing or
 drawing air. The overall flow pattern can be directed from front to
 back, back to front, or side to side.


 Formatting the drive
 --------------------
 Warning!
 Formatting a drive erases all user data. Be sure that you understand
 this principle before formatting any hard disc drive. It is not
 necessary to format a drive that previously has been used to store
 data, unless your intention is to erase all user data.

 Note
 Seagate is not responsible for lost user data.

 1. Turn on DC power.

 2. Boot the system from a system floppy disc or from a previously
    installed hard disc drive if there is one.

 3. Format the disc drive. Elite 23 disc drives are designed to
    operate with a variety of operating systems. Please refer to your
    system or SCSI controller manual for information about formatting
    and setting up the drive. Some quick desktop system notes are
    provided below.


