
S T 4 3 4 0 1 N           E L I T E   3    SEAGATE
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders    2735|     |     |
Capacity form/unform  2912/ 3555 MB        Heads          21|     |     |
Seek time   / track  10.0/ 9.0 ms          Sector/track   99|     |     |
Controller           SCSI2 SI/WI/FAST      Precompensation
Cache/Buffer           512 KB SEGMENTED    Landing Zone
Data transfer rate    5.000 MB/S int       Bytes/Sector      512
                     20.000 MB/S ext
Recording method     RLL 1/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 50    |
Power: sleep              W     Humidity     %         5 95    |
       standby            W     Altitude    km                 |
       idle          33.0 W     Shock        g                 |
       seek               W     Rotation   RPM      5400
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h     200000
                                Warranty Month        60
Lift/Lock/Park     YES          Certificates                                  

**********************************************************************
                        L   A   Y   O   U   T
**********************************************************************
SEAGATE  ST43401N/ND  PRODUCT DESCRIPTION

  +---------------------------------------------------------++-+J1
  |                                                         || |
  ++                                                        |+-+
  ++LED                                                     |XX Power
  |                                                         |XX
  |                                                         |
  |                                           Terminator 1+ |XX1
  |                                                      || |XX SCSI
  |                                                      ++ |XX
  |                                                   TP+-1 |XX
  |                                                     4-+ |XX
  |                                           Terminator 1+ |XX
  |                                                      || |XX
  |                                                      ++ |XX
  |                                               Spindle+-+|
  |                                               Sync   +-+|+-+J2
  |                                                         || |
  +---------------------------------------------------------++-+
 ST43401N 2 Terminator Resistor Sips
 ST43401ND 2 Terminator Resistor Dips



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
SEAGATE  ST43401N/ND  PRODUCT DESCRIPTION

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

              Spindle Sync
              +4--1+          TP                  Ground
   +J2-------+|o oo|A       4+--+3             12V +++ 5V +----J1-+
   |o o o o o||o oo|B       2+--+1               | | | |  |o o o o|
   |o o o o o|+----++-------------------------+ +-------+ |o o o o|
  -+4-2-1----+------+oooooooooooooooooooooooo1+-+       +-+-------+-
    +-+-+ | |       |ooooooooooooooooooooooooo| |O O O O|  | | | |
     SCSI | |       +-SCSI-Cable-Connector----+ +-------+  | | | |
     ID   | |                                              | | | |
          | + Master OFF/Slave ON - Spindle Sync           | | | |
          +-- Write Protect option enable                  | | | |
                                                           | | | |
     Spinup Delay (10 secs * ID) --------------------------+ | | |
     Motor Start option enable ------------------------------+ | |
     Parity check disable -------------------------------------+ |
     Sweep Cycle enable -----------------------------------------+


 SCSI ID
 -------
   +----------+-----------------------+
   | SCSI ID  |        Jumpers        |
   |          | ID4   | ID2   | ID1   |
   +----------+-------+-------+-------+
   |    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|
   +----------+-------+-------+-------+


 TP  Terminator Power
 --------------------
   4+-+-+3   Initiator supplies power over the SCSI Bus for
    |X+-+    terminators. Drive supplies no terminator power.
   2+-+-+1

   4+-+-+3   Drive supplies power for its own terminator resistor-paks
    +-+-+    but not to SCSI Bus. (Default)
   2+xxx+1

   4+-+-+3   Drive supplies power for external terminator at end of
    |X|X|    the daisy chain. Terminator resistor-paks must be
   2+-+-+1   removed. This option is recommended only for last drive
             on daisy-chain. (This option only on Single-Ended drives)


 Terminator Resistor
 -------------------
 The Model ST43401N has 2 SIPs.
 The Model ST43401ND has 2 DIPs.



**********************************************************************
                      I   N   S   T   A   L   L
**********************************************************************
SEAGATE  ST43401N/ND/ST43402ND  REFERENCE MANUAL 83327730 REV. C 12/94

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

 Mounting
 --------
 The drive can be mounted using either side-mounting screws or
 bottom-mounting screws.


 Planning the system
 -------------------
 This section supplements the installation instructions presented in
 the user's manual (publication 83327720). To aid in configuring the
 drive for specific system requirements, the following subjects are
 discussed:

 - Guidelines for enclosure design

 - Guidelines for proper air flow

 - Using the sweep cycle function


 Guidelines for enclosure design
 -------------------------------
 The drive is a component for installation in an enclosure that you
 have designed. The enclosure design must provide for mounting the
 drive and power supply, cable routing, and cooling. See the next
 topic for guidelines on providing proper cooling.

 The system designer is responsible for obtaining any needed agency
 approvals such as UL, CSA, and VDE.


 Guidelines for proper air flow
 ------------------------------
 Your enclosure design must ensure adequate cooling for the drive.
 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 airflow 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.


 To evaluate the airflow design, place the drive in its final
 mechanical position and perform random read and write operations.
 After the temperatures stabilize, measure the surface (case)
 temperatures of the components.

 In some cases, the internal cables connect to a bulkhead that allows
 external shielded cables to be connected. Shielded cables must be
 used if the cables run between cabinets.

 Cumulative cable length in a daisy-chain system cannot exceed 25.0m
 (82.0 ft) for drives using differential I/O. With single-ended I/O,
 cumulative cable length cannot exceed 3.05m (10.0 ft).

 ST43402ND (dual port) drives have both I/O connectors (one for Port A
 and the other for Port B) located on the I/O board. You must use an
 adapter (part number 70935801) to terminate each I/O cable following
 the last drive in the daisy chain.

 ST43401N/ND (single-ended) drives are shipped with resistorpak
 terminators installed on the control board. Each end of the
 daisy-chain I/O cable must be terminated. If the resistorpak
 terminators are in place on the drive, external terminators are not
 needed. Single-ended terminators and differential terminators have
 different part numbers and electrical characteristics (they cannot be
 interchanged).


 Unshielded I/O cabling components
 ----------------------------------
 Vendor part number         Description
 ------------------------------------------------------------------
 Connectors for cable ends
 AMP-786090-7               Connector, unshielded male, straight

 Connectors in daisy chain
 AMP-786096-7               Connector, shielded male, straight (two
                            used per cable)

 Cable
 Hitachi-A3007-51-68T       Flat cable, twisted-pair, 68-conductor, 30
                            AWG (for single-ended or differential I/O)


 Synchronized spindle cables
 ---------------------------
                           Seagate
 Length                    part number
 1.5 feet (0.46 meter)     70703929
 3 feet (0.91 meter)       70703921
 5 feet (1.52 meter)       70703922
 7 feet (2.13 meter)       70703923
 10 feet (3.05 meter)      70703924
 20 feet (6.09 meter)      70703925
 30 feet (9.14 meter)      70703926
 40 feet (12.19 meter)     70703927
 50 feet (15.24 meter)     70703928


 Terminators
 -----------
                                              Seagate
 Description                                  part number
 Terminator resistor-pak, single-ended        96752447
 Terminator resistor-pak, differential        70906701
 Terminator, external shielded single-ended   89501152
 Terminator, external shielded differential   89501030
 Terminator, external unshielded single-ended 15387807
 Terminator, external unshielded differential 15459255
 Terminator, adapter for dual-port drives     70935801


 Using the sweep cycle function
 ------------------------------
 The sweep cycle is a feature that periodically moves the heads to
 different locations on the discs during intervals when the drive is
 idle. The following are highlights of the sweep cycle function:

 - Using the sweep cycle enhances drive reliability. We encourage you
   either to enable the drive sweep cycle or to use a sweep cycle
   controlled by the host (initiator). Consult with an analyst in
   making this choice.

 - The sweep routine consumes approximately 11 seconds of a 13-hour
   period. The drive is available to the system more than 99.98
   percent of the time.

 - You may disable the sweep cycle (described below) without affecting
   the specified mean time between failures (MTBF) or warranty
   agreements.

 The drive is preset during manufacturing with the sweep cycle option
 selected. A jumper on the control board makes the selection. The
 other jumpers on the control board are discussed in the user's
 manual.

 The jumper is identified as Sweep Cycle Option, which either enables
 or disables the sweep cycle function. The jumper can be positioned as
 follows:

 - Jumper disconnected - disables the sweep cycle function

 - Jumper connected - enables the sweep cycle function

 Sweep movements, if enabled, can occur only in conjunction with seeks
 required by the controller or with any SCSI read or write operation
 having an implied seek. Each time the drive performs a sweep cycle,
 it starts a 12-minute timeout. When the timeout has elapsed, the
 drive performs another sweep cycle only when it receives the Seek
 command. When combining a sweep cycle with a seek, the drive performs
 the sweep cycle first and then executes the Seek command.

 If a sweep segment was initiated by the Seek command, the drive
 performs the sweep function and then moves the heads to the cylinder
 requested by the controller. If about 15 minutes elapse with no disc
 access commands received from the SCSI bus, the SCSI I/O logic sends
 a one-track seek command to the drive logic. This command causes the
 drive to perform its sweep cycle.


 Interface functions
 -------------------
 This section provides an overview of the small computer system
 interface (SCSI) as it is used in the Elite drive. It is beyond the
 scope of this manual to provide a detailed description of all the
 features, capabilities, variations, and protocol of SCSI-2. This
 information is provided in the SCSI Interface Specification for the
 Elite Product Family (document 64721702).

 All communications between drive and controller must pass through the
 interface. This communication includes all commands, status, control
 signals, and read/write data transfers. The interface consists of the
 I/O cables and the logic (on part of the control board) required to
 process the signals sent between the drive and controller.


 Dual port drive (ST43402ND) considerations
 ------------------------------------------
 ST43402ND dual port drives have some different operating limits from
 the single port drives discussed in this manual. These differences
 are listed below.

 - Dual port drives have separate sense buffers, synchronous transfer
   agreements, and unit attention conditions for each initiator on
   both ports.

 - Any initiator may place commands in the queue on either port.

 - Data placed in the cache by one port may be used to satisfy a read
   request from the other port. A write from one port may cause data
   cached by a read request from the other port to be purged from the
   cache.


 SCSI bus configuration
 ----------------------
 The SCSI bus can have a maximum of 16 devices connected to it, and
 communication can occur between any 2 devices at any given time. The
 device that originates an operation is referred to as the initiator
 and the device that performs the operation is the target. The drive
 uses one unshielded I/O cable to attach it to the SCSI bus. You must
 supply all unshielded cables. Shielded cables are typically used for
 connections between cabinets where electromagnetic compatibility
 (EMC) and electrostatic discharge (ESD) protection are required. The
 I/O cable carries commands, data, and status information across the
 SCSI bus.



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
SEAGATE  ST43401N/ND/43402ND  REFERENCE MANUAL 83327730 REV. C  12/94

 Preface
 -------
 This is a reference manual for users of Seagate ST43401N/ND and
 ST43402ND Elite disc drives employing the SCSI interface. It
 supplements the information presented in the user's manual
 (publication 83327720). It is intended to aid engineers who
 design subsystems using the drive and customer engineers who
 install and check out the drive. This manual should be used in
 conjunction with the user's manual.


 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 metaloxide 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, service personnel must observe the
 following precautions when 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 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.


 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 and repair techniques for safe, reliable operation
 of this unit. Service should be done only by qualified persons. We
 recommend the procedures in this manual as effective ways of
 servicing the unit. Some procedures require the use of special
 tools. For proper maintenance and safety, you must use these
 tools as recommended.

 The procedures in this manual 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.

 You must also understand that these warnings and cautions are not
 exhaustive. We cannot possibly know, evaluate, and advise you of
 all the ways in which maintenance might be performed or the possible
 risk of each technique. Consequently, we have not completed any
 such broad evaluation. If you use a nonapproved procedure or tool,
 first ensure that the method you choose will not risk either your
 safety or unit performance.


 Always observe the following warnings and precautions:
 ------------------------------------------------------
 - Perform all maintenance by following the procedures in this manual.

 - Follow all cautions and warnings in the procedures.

 - Use sound safety practices when operating or repairing the unit.

 - Use caution when troubleshooting a unit that has voltages present.
   Remove power from the unit before servicing it.

 - Wear safety shoes when removing or replacing heavy parts.

 - Ensure that the internal temperature of the rack or cabinet will
   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 under "Electrostatic discharge
   protection" above.

 - Do not remove any circuit boards from the drive chassis. 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.

 - Do not remove the head and disc assembly (HDA) from the drive
   chassis. 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, IEC950, EN60950, CSA C22.2 950, and
   VDE0805.

 - Ensure that the power supply meets the specifications in this
   manual and is designed to be used in accordance with UL1950,
   IEC950, EN60950, CSA C22.2 950, 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
 enduse product. The subsystem designers are responsible for meeting
 these conditions of acceptability in obtaining safety/regulatory
 agency compliance in their end-use products and in 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 standalone unit.
 Engineering radiated and conducted emissions test results are
 available through the Seagate Safety Department to assist the
 subsystem designer.


 General maintenance information
 -------------------------------
 This section contains general information relating to maintenance
 of the drive. You should be familiar with the information in this
 section and with drive operation before attempting any maintenance
 procedures. Information is divided into the following areas:

 - Maintenance tools and materials_lists the tools and materials
   required to perform maintenance on the drive
 - Testing the drive_provides information concerning testing drive
   electronics, including a procedure for checking DC voltages
   supplied to the drive.
 - Identifying assemblies in the drive_identifies the various
   parts of the drive.

 Note. Refer to the user's manual (publication 83327720) for
 information about arranging for depot repair, removing and
 replacing a drive or power supply, and packing a drive for shipment.


 Maintenance tools and materials
 -------------------------------
 The procedures described in this section require the use of certain
 special tools, test equipment, and materials. These are listed below
 along with the Seagate part number. Note that the list includes
 only special tools. We assume that you have normal maintenance tools.


 Testing the drive
 -----------------
 During testing and troubleshooting, the drive normally performs
 various operations such as reading and writing test data. System
 software can be used to control the drive during these operations.
 Refer to manuals or other documentation applicable to the specific
 system or subsystem for information concerning the system software
 routines.

 The following procedure provides an overall check of the DC voltages
 used by the drive. Before performing this procedure, you should be
 familiar with the other information in this section and the safety
 information in the preface.


 Planning the system
 -------------------
 This section supplements the installation instructions presented in
 the user's manual (publication 83327720). To aid in configuring the
 drive for specific system requirements, the following subjects are
 discussed:

 - Guidelines for enclosure design

 - Guidelines for proper air flow

 - Guidelines for I/O cabling

 - Using the sweep cycle function


 Guidelines for enclosure design
 -------------------------------
 The drive is a component for installation in an enclosure that you
 have designed. The enclosure design must provide for mounting the
 drive and power supply, cable routing, and cooling. See the next
 topic for guidelines on providing proper cooling.

 The system designer is responsible for obtaining any needed
 agency approvals such as UL, CSA, and VDE.
 As described in the user's manual, the drive can be mounted using
 either side-mounting screws or bottom-mounting screws.


 Interface functions
 -------------------
 This section provides an overview of the small computer system
 interface (SCSI) as it is used in the Elite drive. It is beyond
 the scope of this manual to provide a detailed description of all
 the features, capabilities, variations, and protocol of SCSI-2.
 This information is provided in the SCSI Interface Specification
 for the Elite Product Family (document 64721702).

 All communications between drive and controller must pass through
 the interface. This communication includes all commands, status,
 control signals, and read/write data transfers. The interface
 consists of the I/O cables and the logic (on part of the control
 board) required to process the signals sent between the drive and
 controller.


 SCSI bus configuration
 ----------------------
 The SCSI bus can have a maximum of 16 devices connected to it, and
 communication can occur between any 2 devices at any given time. The
 device that originates an operation is referred to as the initiator
 and the device that performs the operation is the target. The drive
 uses one unshielded I/O cable to attach it to the SCSI bus. You must
 supply all unshielded cables. Shielded cables are typically used for
 connections between cabinets where electromagnetic compatibility
 (EMC) and electrostatic discharge (ESD) pro-tection are required.
 The I/O cable carries commands, data, and status information across
 the SCSI bus. Figure 12 shows the lines (except those not used) in
 the I/O cable.


 Error code
 ----------
 This two-byte value provides information about what part of the
 diagnostic operation has failed. The error codes are shown in Table
 16.

 Table 16. Error codes

 Code    |  Description
 --------+----------------------------------------------------------
 0001H   |  Formatter diagnostic error
 --------+----------------------------------------------------------
 0002H   |  Microprocessor RAM diagnostic error
 --------+----------------------------------------------------------
 0004H   |  No drive ready
 --------+----------------------------------------------------------
 0008H   |  No sector or index detected
 --------+----------------------------------------------------------
 0009H   |  Fatal hardware error while doing drive diagnostics
 --------+----------------------------------------------------------
 000CH   |  No drive command complete
 --------+----------------------------------------------------------
 0010H   |  Unable to set drive sector size
 --------+----------------------------------------------------------
 0014H   |  Unable to clear drive attention 0018H Unable to start
         |  spindle motor
 --------+----------------------------------------------------------
 0020H   |  Unable to recalibrate drive
 --------+----------------------------------------------------------
 0030H   |  Unable to send write current data to drive
 --------+----------------------------------------------------------
 0034H   |  Unable to issue drive seek command
 --------+----------------------------------------------------------
 0040H   |  Unable to read user table from drive
 --------+----------------------------------------------------------
 0041H   |  Ran out of sectors while doing drive diagnostics
 --------+----------------------------------------------------------
 0042H   |  Unable to read reallocation table
 --------+----------------------------------------------------------
 0043H   |  Unable to read ETF log
 --------+----------------------------------------------------------
 0044H   |  Unable to read firmware stored on disc
 --------+----------------------------------------------------------
 0045H   |  Firmware read from disc or sent by host has an invalid
         |  checksum
 --------+----------------------------------------------------------
 0060H   |  Thermal calibration failure
 --------+----------------------------------------------------------
 0070H   |  Microprocessor internal timer error
 --------+----------------------------------------------------------
 0080H   |  Buffer controller diagnostic error
 --------+----------------------------------------------------------
 0081H   |  Buffer RAM diagnostic error
 --------+----------------------------------------------------------
 00C1H   |  Data miscompare while doing drive diagnostics
 --------+----------------------------------------------------------
 00F0H   |  PROM checksum error
 --------+----------------------------------------------------------
 00F1H   |  CPU error
 --------+----------------------------------------------------------
 00F2H   |  SCSI protocol chip error
 --------+----------------------------------------------------------
 00F3H   |  ECC subsystem error
 --------+----------------------------------------------------------


