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.

                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/HH               Cylinders    1072|     |     |
Capacity form/unform    99/  112 MB        Heads           5|     |     |
Seek time   / track  15.0/ 4.0 ms          Sector/track   36|     |     |
Controller           ESDI                  Precompensation 65535
Cache/Buffer               KB              Landing Zone
Data transfer rate    1.250 MB/S int       Bytes/Sector      512
                            MB/S ext
Recording method     RLL 2/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C        10 50    |    -40 70
Power: sleep              W     Humidity     %         8 80    |      5 95
       standby            W     Altitude    km    -0.305  3.048| -0.305 12.210
       idle               W     Shock        g        10       |     50
       seek          12.0 W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h      30000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     CSA,FCC,IEC380,IEC435,UL47...


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                        L   A   Y   O   U   T
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SEAGATE  ST1111/ST1156/ST1201-E  PRODUCT MANUAL 36135-001, REV. B

  +---------------------------------------------------------+x Ground
  |                                                 +-J7--1 |X1
  |                                                 +-----+ |XXControl
  |                                                    ++   |XXCable
  |                                                    ||   |XX
  |                                                    ||   |XX
  |                                          Terminator++   |XX
  |                                          Resistor  ++   |XX
  |                                          Sip (2)   ||   |XX
  |                                                    ||   |XX
  |                                                    +++-+|
  |                                                    J6| ||
  |                                                      +-1|X1
  |                                                         |XXData
  |                                                         |XXCable
  |                                                         |XX
  |                                                         |   Power
  |                                                         |XXXXX J3
  +---------------------------------------------------------+



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                      J   U   M   P   E   R   S
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SEAGATE  ST1111/ST1156/ST1201-E  PRODUCT MANUAL 36135-001, REV. B

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

 x = Jumpers set at factory



 J3  Power Connector
 -------------------

          +---+---+---+---+
          | 1 | 2 | 3 | 4 |
          +--++--++--++--++
             |   |   |   +---------- + 5V
             |   |   +-------------- + 5V Return
             |   +------------------ +12V Return
             +---------------------- +12V



 J6   Drive select
 -----------------

        Drive |  1   |  2   |  3   |
        ------+------+------+------+
          0   |OPEN  |OPEN  |OPEN  |
   x      1   |CLOSED|OPEN  |OPEN  |
          2   |OPEN  |CLOSED|OPEN  |
          3   |CLOSED|CLOSED|OPEN  |
          4   |OPEN  |OPEN  |CLOSED|
          5   |CLOSED|OPEN  |CLOSED|
          6   |OPEN  |CLOSED|CLOSED|
          7   |CLOSED|CLOSED|CLOSED|


 Drive Select 0 is not allowed!


 Drive Select
 ------------
 The following characteristics apply to the Drive Select lines:

  1.   Logical unit designation for up to 7 drives is performed during
       installation by installing jumpers on pins on a connector
       header on the PWA. The jumpers are installed in a complemented
       binary coded position configuration to select device addresses
       1 through 7. Zero is not a valid address.

  2.   The controller shall not attempt to select the drive until one
       (1) second after DC power is applied. The Ready output will be
       valid (whether asserted or negated) within 1 us after the drive
       is selected.

  3.   The drive will be selected (and the Drive Selected Signal
       asserted) within 1 us after the Drive Select lines contain that
       unit's select address. The drive will be deselected (and the
       Drive Selected signal negated) within 1 us after the Drive
       Select lines contain another unit's select address.

  4.   The Drive Select lines must remain asserted for 1 us after a
       write operation.

  5.   When the Drive Select lines are asserted, a head change will
       occur, requiring a delay before a read or write operation can
       be initiated.



 J7  Motor Start Option
 ----------------------
     1   OPEN    Spindle motor starts on power-up
         CLOSED  Spindle motor start command required to start motor


 J7  Sector Mode
 ---------------
     2   OPEN    Hard sector mode
         CLOSED  Soft sector mode

 The SWIFT supports the use of the soft sector format as described in
 the CDC ESDI Specification, 77738076, Section 6.4.4.

 To implement the optional soft sectored format operation, select
 "Address Mark" mode in the SWIFT by installing configuration jumper.


 J7  Sector Configuration
 ------------------------
     3   CLOSED
     4   OPEN    34 sectors per track at 512 bytes pro sector
     --------------------------------------------------------
         3   OPEN
         4   OPEN   36 sectors per track at 512 bytes per sector
         -------------------------------------------------------
              3   OPEN
              4   CLOSED  64 sectors per track at 256 bytes per sector
              --------------------------------------------------------
                   3   CLOSED
                   4   CLOSED  Factory test
                   -------------------------


 J7  External Spindle Clock (optional)
 -------------------------------------
      5   OPEN    Spindle sync disabled
          CLOSED  Spindle sync enabled

 The external spindle clock option allows for synchronized rotation of
 multiple disk drives in a system. Each drive can be configured to one
 of the following modes:

       a. Use internal spindle clock, omit spindle reference clock.
       b. Use external spindle clock with a line terminator.
       c. Use external spindle clock without the line terminator.


 System Configuration
 --------------------
 The spindle rotation synchronization uses one of the following
 methods:
       a. Reference clock is generated by the controller. All the disk
          drives are connected radially to the controller. Each end
          must be terminated.
       b. Reference clock is generated by the controller. All the disk
          drives are connected in parallel (daisy chain) to the
          controller. The controller end and the last drive in the
          chain must be terminated.
       c. Reference clock is generated by a master disk drive. The
          controller receives the clock and provides all other drives
          in the system with the reference clock using the radial or
          the daisy chain connection method. Each end (master disk
          drive and controller) must be terminated.
       d. Reference clock is generated by a master disk drive. All
          disk drives are connected in parallel (daisy chain) to the
          master disk drive. The master disk drive end and the last
          drive in the chain must be terminated.



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                      I   N   S   T   A   L   L
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SEAGATE  ST1111/ST1156/ST1201-E  PRODUCT MANUAL 36135-001, REV. B

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

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

     horizontally             vertically
   +-----------------+   +--+             +--+ +------------------+
   |                 |   |  +-----+ +-----+  | |                  | x
   |                 |   |  |     | |     |  | x+----------------+x
 +-+-----------------+-+ |  |     | |     |  | ||x              x||
 +---------------------+ |  |     | |     |  | ||  x          x  ||
                         |  |     | |     |  | ||    x      x    ||
      x           x      |  |     | |     |  | ||      x  x      ||
 +------x------x-------+ |  +-----+ +-----+  | ||       xx       ||
 +-+------x--x-------+-+ +--+             +--+ ||     x    x     ||
   |       xx        |                         ||   x        x   ||
   |     x    x      |                         || x            x ||
   +---x--------x----+                         |x                x|
     x            x                           x++----------------++x
      UNACCEPTABLE!                                UNACCEPTABLE!
      Never install PC board on the Top!



 Drive Orientation
 -----------------
 The permissible drive mounting orientations include operation in the
 horizontal plane with PCB down and in the vertical plane. Mounting
 with either end down (front or rear) is not permissible.


 The SWIFT is designed, manufactured, and tested with a "Plug-in and
 Play" installation philosophy. Basically, this philosophy minimizes
 the requirements for highly trained personnel to integrate the SWIFT
 into an OEM's system, wether in a factory or field environment.


 Front Panel
 -----------
 The SWIFT is available with a black front panel. The panel has a
 a single green rectangular lens through which ligth from a LED
 mounted on the PWA radiates. The LED indicates the drive is selected
 when glowing. A flashing LED indicates the presence of a non-
 recoverable fault. A fault indication is displayed irrespective of
 DRIVE SELECT status.


 Cooling
 -------
 Cabinet cooling must be designed by the customer so that the ambient
 temperature immediately surrounding the SWIFT does not exceed
 temperature conditions.

 Sway
 ----
 The sway of the HDA left to right and front to rear is within the
 envelope. The sway of the HDA up and down is   0.05 inch outside the
 envelope.



 Interface Cabling Options
 -------------------------

 View A
    +---------------------Host-Controller---------------------+
    |                                                         |
    |Data Control   Data Control  Data Control   Data Control |
    +--+-----+--------+-----+--------+-----+--------+-----+---+
       |     |        |     |        |     |        |     |
       |     |        |     |        |     |        |     |
       |     |        |     |        |     |        |     |
       |     |        |     |        |     |        |     |
    +-++-+--++-+-+ +-++-+--++-+-+ +-++-+--++-+-+ +-++-+--++-+-+
    | |T |  |*T| | | |T |  |*T| | | |T |  |*T| | | |T |  |*T| |
    | +--+  +--+ | | +--+  +--+ | | +--+  +--+ | | +--+  +--+ |
    |   SWIFT    | |   SWIFT    | |   SWIFT    | |   SWIFT    |
    +------------+ +------------+ +------------+ +------------+

    Each control cable length must not exceed 10 feet (3.00m). Each
    data cable length must not exceed 10 feet (3.00m).


   *T  indicates removable terminator resistor pack.
    SWIFT data ports are permanently terminated.



 Radial Configuration
 --------------------
 View A shows each drive interfaced to its own control cable, which
 allows interfacing an arbitrary number of drives and a variety of
 system operational techniques. Each drive has its data cable and
 control cable connected to the host controller. The length of each
 individual cable must not exceed 10 feet (3.00 meters). Terminator
 resistors must be installed in the host controller for each data
 cable and for each control cable. For this configuration, a
 terminator resistor pack must be installed in each SWIFT Disc Drive.




 View B
    +--------------Host Controller-------------+
    |                                          |
    |Data Control   Data          Data         |
    +-+------+-------+--------------+----------+
      |      |       |              |
      |      |       |              |
      |      |       |              |
      |      +-**----+-Control------+Control+
    +++-+----+---+ +++-+-----+--+ +++-+----++-++
    ||T |        | ||T |        | ||T |    |*T||
    |+--+        | |+--+        | |+--+    +--+|
    | SWIFT/ESDI | | SWIFT/ESDI | | SWIFT/ESDI |
    +------------+ +------------+ +------------+

    Total control cable length must not exceed 10 feet (3.00m). Each
    data cable length must not exceed 10 feet (3.00m).

   *T  indicates removable terminator resistor pack.
   SWIFT data ports are permanently terminated.
   ** May be up to seven (7) devices in daisychain.


 Daisychain Configuration
 ------------------------
 A daisychain configuration connects a maximum of seven drives in
 parallel on a common control cable. Only the drive selected by the
 host system has its control signals enabled through this
 common interface. View B illustrates a daisy chain of SWIFT Disk
 Drives or other ESDI devices. A terminator resistor pack is
 required in the host controller for each data cable. Only the last
 ESDI device in the daisychain requires a terminator resistor pack
 for the control cable. Terminator resistor packs for the control
 cable or other drives must be removed. The total combined control
 cable length (from the controller to the first drive, to the second
 and subsequent drives) must not be more than 10 feet (3.00 meters).


 DC Cable and Connector
 ----------------------
 The SWIFT receives DC power through a 4 pin connector mounted on the
 HDA. Recommended part numbers of the mating connector are provided,
 but equivalent parts may be used.

 Type of cable:      18 AWG
 Connector:          AMP 1-480424-0
 Contacts:           AMP 60619-4 (Loose Piece); AMP 61117-4 (Strip)


 Ground Connection
 -----------------
 A quick disconnect, Amerlock MTL-1802-A, is provided on the drive
 chassis.

 Type of cable:      26-24 AWG
 Connector:          WALDOM ST-2750
 Contacts:           Quick Disconnect (Ground)



 Data Cable and Connector
 ------------------------
 The I/O connector for the data interface is a 20 pin board edge
 connector. The odd pins are located on the side of the printed
 circuit board facing towards the HDA. The even pins are on the side
 of the printed circuit board facing away from the HDA. A key slot is
 provided between pins 3 and 5. CDC recommends keying this connector
 to prevent installing it upside down. However, the SWIFT will not be
 damaged if the connector is installed upside down.

 Recommended part numbers for the mating connector are included below,
 but equivalent parts may be used.

 Connector:          20 pin, 3M-3461-0001, AMP 88373-6
 Cable:              Flat Cable (Stranded AWG 28) 3M-3365-20
                     Flat Cable (Stranded AWG 28) 3M-3517-20 (Shielded
                     Cable)
 Key:                AMP 583274-1, 3M-3439-0000



 Command Cable and Connector
 ---------------------------
 The I/O connector for the control interface is a 34 pin board edge
 connector. The odd pins are located on the front side of the
 printed circuit board facing towards the HDA and are connected to the
 ground plane. The even pins are on the side of the printed circuit
 board facing away from the HDA. A key slot is provided between pin 3
 and 5. CDC recommends keying this connector to prevent installing it
 upside down.

 Recommended part numbers for the mating connector are provided, but
 equivalent parts may be used.

 Connector:          34 pin, 3M-3463-0001, AMP 88373-3
 Key:                AMP 583274-1, 3M-3439-0000
 Cable:              Flat cable (Stranded AWG 28) 3M-3365-34
                     Flat cable (Stranded AWG 28) 3M-3517-34 (Shielded
                     Cable)
                     Spectra Strip Twist'n Flat 455-248-34 (Stranded
                     AWG 28 Twisted Pair)


 Spindle reference clock Cable and Connector
 -------------------------------------------
 The connector for the spindle reference clock signal is a 2-pin 2.0
 mm pitch connector. The recommended connector consists of:

        a.  DuPont Housing  69305-002
        b.  DuPont Terminal 77138-001

 or equivalent.

 The cable consists of two 28 AWG wires. The maximum cable length is
 20 feet (6.1 metres).



 Interface Drivers/Receivers
 ---------------------------
 The SWIFT uses both single ended and balanced differential signals on
 the I/O. The data signals use balanced differential drivers and
 receivers. All other signals use single ended drivers and receivers.


 Single Ended Drivers/Receivers
 -------------------------------
 Transmitter Characteristics
 The SWIFT uses the 74F38 open collector quad invertor buffer/driver
 to transmit status to the host. This driver is capable of sinking a
 current of 40 mA with a low level output voltage of 0.7 V.


 Receiver Characteristics
 The SWIFT uses a custom receiver with hysteresis gate as a line
 receiver. The input of each receiver is terminated with a 150 ohm
 pull-up resistor.


 Terminator Characteristics
 The terminator are resistor modules which plug into  sockets in the
 last drive in a daisychain. Each drive is furnished with terminators.
 Terminators must be removed from all except the last drive on the
 cable prior to daisychain operation. Equivalent terminators must be
 provided in the controller on each input signal line from the drive
 to the controller. Only the command cable resistor modules are
 removable. The removable terminators are Beckman Industrial P/N
 L081C151F or equivalent.


 Balanced Differential Drivers/Receivers
 ---------------------------------------
 Transmitter Characteristics
 The SWIFT uses 75158 type balanced differential drivers. An assertion
 on  the interface is defined when the "+" output is more positive
 than the "-" output.


 Receiver Characteristics
 The SWIFT uses 75157 type balanced differential receivers. An
 assertion on the interface is defined when the "+" input is more
 positive than the "-" input.


 Terminator Requirements
 Each differential receiver in the drive is terminated with a 100 ohm
 resistor. These terminators are not removable. An equivalent
 terminator must be provided in the controller on each input signal
 line from the drive to the controller.



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                      F   E   A   T   U   R   E  S
**********************************************************************
SEAGATE  ST1111/ST1156/ST1201-E  PRODUCT MANUAL 36136-001, REV. B

 General Description
 -------------------
 The SWIFT is 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 Model 94356 SWIFT supports the Enhanced Small Device Interface
 (ESDI) as deccribed in Control Data's ESDI Specification (77738076).
 This product specification was created to be used in conjunction with
 this industry standard interface specification.


 Standards
 ---------
 The SWIFT has been developed as a system peripherals to the highest
 standards of design and construction. The SWIFT depends upon its host
 equipment to provide adequate power and environment in order to
 achieve optimum performance and compliance with applicable
 industry and governmental regualations. Special attention must be
 given in the areas of safety, power distribution, shielding, audible
 noise control, and temperature regulation.

 The SWIFT complies with CDC standards.


 The SWIFT is a UL Recognized component per UL478 and a CSA Certified
 product per CSA C22.2, No. 220-M1986. It also meets the requirements
 of DIN IEC 380/IEC 435/IEC 950/VDE 0806/8.81.

 The SWIFT, as delivered, is designed for system integration before
 use. It is supplied as a Class A Computing device per the FCC Rules
 and Regulations, Part 15, Subpart J governing EMI of computing
 devices.


 The SWIFT uses a dedicated landing zone at the innermost radius of
 the media, where there is no user data, thus eliminating the
 possibility of destroying or degrading customer data. Read/write
 heads are automatically moved to the landing zone upon loss of power.

 The SWIFT incorporates an automatic shipping look which prevents
 potential damage to the heads and discs caused by movement during
 shipping and handling. The shipping lock is automatically disengaged
 when power is applied to the drive and nominal spindle speed is
 achieved.

 The SWIFT decodes Track locations from the dedicated servo surface
 thereby eliminating mechanical transducer adjustments and
 related reliability concerns.

 The SWIFT uses a high performance actuator assembly consisting of a
 low inertia, patented straight arm driven by a highly efficient
 pancake coil assembly. This actuator mechanism provides excellent
 performance with minimal power dissipation.

 Media Description
 -----------------
 The media used in the SWIFT has a diameter of approximately 95 mm.
 The aluminum substrate is coated with a thin film magnetic material,
 and lubricated to permit the heads to contact the surface when start-
 ing and stopping.

 Each data surface has a total of 1072 tracks and is capable of
 recording 22,383,360 bytes of unformatted data.

 Media defects are characterized as beeing ether correctable or
 uncorrectable as a function of the type and magnitude of the media
 flaw. Various error correction codes may be implemented to correct
 errors in the data read from the disk. However, the code chosen
 should be consistent with Control Data media testing and
 certification methods. In the SWIFT media certification is performed
 using the following standards:

            An error burst of 11 bits or less is a correctable error.

            An error burst greater than 11 bits in length is an un-
            correctable error.

 Host systems using the SWIFT should have, as a minimum, resident
 capabilities to recognize and map defective tracks and perform track
 reallocation routines.

 At the time of shipment from the point of manufacture, the SWIFT
 recording surfaces meet the following requirements.

       1. 1072 total data tracks per surface.

       2. Track 0 to be error free on each data surface.

       3. 40 bad tracks per surface maximum.

       4. Cumulative defects not to exceed 1 per megabyte, based on
          total available unformatted drive capacity.



 Defect and Error Management
 ---------------------------
 The SWIFT, as delivered, complies with this specification. The read
 error rate and specified storage capacity are not dependent upon use
 of defect management routines. However, a carefully chosen defect
 management plan can significantly enhance overall system performance.

 Identified defects are recorded on the defects list tracks per CDC
 ESDI specification. It is recommended that these known defects be re-
 allocated during the initial format operation. Sector reallocation is
 suggested because, in general, it is more efficient and may offer
 significant performance improvement. Error Correction Code (ECC)
 should be used to correct additional flaws as they occur. ECC is re-
 commended since most of the defects are recoverable with ECC. If ECC
 is not used, defects are usually unrecoverable and need to be re-
 allocated as they are discovered.


 Acoustic Noise Level
 --------------------
 Acoustic noise power level of the SWIFT should be less than TBD bels
 during idle/operating mode. Equivalent typical average sound pressure
 level should be less than TBD dba when measured with microphone at a
 distance of one meter from the drive.


 Custom Formatting
 -----------------
 The SWIFT is formatted during production. CDC maintains custom
 formatting capability which can incorporate many of the unique
 formats used in the Winchester marketplace. A majority of special
 format requirements can be implemented as specified.


 Drive/Receiver Characteristics
 ------------------------------
 Logic Level                   Drive Output         Receiver Input
 --------------------------------------------------------------------
 High (false/negated) (0)      2.5 V;   5.25 V      2.0 V;   5.25 V
 Low  (true/asserted) (1)      0.4 V;   0.0 V       0.5 V;   0.0 V

 The difference in the voltages between input and output signals is
 due to the losses in the cable.


 Seek Time
 ---------

                                          |  SWIFT |
        ----------------------------------+--------+
        Track-to-track         msec. max. |   4    |
                       Average msec. typ. |  15    |
                       Average msec. max. |  16.5  |
        Latency                msec. avg. |   8.33 |
        ----------------------------------+--------+
 Seek time is defined as the time required from the receipt of a seek
 or position command by the SWIFT until the drive signals the
 controller that it is ready to perform another seek or  read/write
 function on the new cylinder. Average seek time is determined by
 dividing the sum of the time for all possible movements by the total
 number of movements.


 Spindle Speed and Latency
 -------------------------
 The spindle speed is 3600   0.5% r/min. The speed tolerance includes
 motor performance and motor control circuit tolerances.

 The average latency time is 8.33 milliseconds, based on a nominal
 disk speed of 3600 r/min. The maximum latency time is 16.75 milli-
 seconds based on a minimum disc speed of 3582 r/min.


 Read Data Transfer Rate
 -----------------------
 The nominal read serial data transfer rate is 10.0225 MHz   1% Mega-
 bits per second, 1.25 Megabytes per second.


 Power Sequencing
 ----------------
 Power sequencing is not required for the SWIFT. The SWIFT protects
 against inadvertent writing during power up and down. Daisychain
 operation requires that power be maintained on the terminated unit
 to ensure proper termination of the peripherals I/O cables.


 Temperature
 -----------
 50* to 122*F (10*C to 50*C) (dry air) operating ambient with a
 maximum gradient of 18* F (10* C) per hour. Above 1000 feet (305
 meters) altitude the maximum temperature is derated linearly to 112*F
 (44.0*C) at 10,000 feet (3048 meters). Cabinet packaging designs
 must provide ample air circulation around the SWIFT to make sure
 environmental limits are not exceeded as a result of heat transfer
 from other system components. Operating ambient for specification
 purposes is defined as the environment immediately surrounding the
 SWIFT. The temperature of the HDA is restricted to a maximum of
 TBD during operations.


 Reliability
 -----------
 The following reliability specifications assume correct host/drive
 operational interface has been implemented, including all interface
 timings, power supply voltages, and environmental conditions and
 appropriate data handling circuits in the host system.

 MTBF                     30,000 hours
 Service Life             5 years
 Preventive Maintenance   None required