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Hard Drive: CDC: WREN VIHH 94246-383 338MB 5.25"/HH ESDI




W R E N   V I H H   9 4 2 4 6 - 3 8 3    CDC
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders    1747|     |     |
Capacity form/unform   338/  383 MB        Heads           7|     |     |
Seek time   / track  16.0/ 3.0 ms          Sector/track   54|     |     |
Controller           ESDI                  Precompensation 65535
Cache/Buffer               KB              Landing Zone
Data transfer rate    1.875 MB/S int       Bytes/Sector      512
                            MB/S ext
Recording method                                    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       |     40
       seek          19.0 W     Rotation   RPM      3592
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h      40000
                                Warranty Month
Lift/Lock/Park     YES          Certificates

Layout

SEAGATE ST2182E/ST2383E PRODUCT MANUAL 77765369-C

  +--------------------------------------------------------+
  |                                                        |XX J4
  |                                                        |XX Data
  |                                                +-+     |XX Cable
  |                                     Terminator | |     |XX
  |                                     Resistor   | |     |X1
  |                                     Pack       | |     |
  |                                                +-+     |XX
  |                                                +-+     |XX J3
  |                                                | |J2   |XX Control
  |                                                | |     |XX Cable
  |                                                +-1     |XX
  |                                                +-+     |XX
  |                                                | |J8   |XX
  |                                                +-1     |X1
  |                                                        |
  |                                                        |XX Power
  |                                                        |XX J1
  +--------------------------------------------------------+  1

Jumpers

SEAGATE ST2182E/ST2383E PRODUCT MANUAL 77765369-C

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

x = Jumpers are set at factory

J1 Power Connector
-------------------

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

 J2   Reserved
 -------------
      1   OPEN   RESERVED for factory test

J2 Sector Configuration
------------------------
To implement the hard sectored format operation configure the jumpers
on the option select header to one of the configurations flagged by
the note (4) in the table. The number of sectors chosen should
correspond to the same number of sectors per track that the host
controller is set up to send when it formats the drive or tries to
write or read data to/from the drive.

          Bytes/Sect| Sectors |   4   |   3   |   2
          ----------+---------+-------+-------+---------
             256    |   96    | OPEN  | OPEN  | OPEN      ---+
             512    |   54    | CLOSED| OPEN  | OPEN      ---+
                    |   15    | OPEN  | CLOSED| OPEN      ---+-- 4
          ***Custom |  N/A    | CLOSED| CLOSED| OPEN      ---+
     x       512    |   53    | OPEN  | OPEN  | CLOSED    ---+
             512    |   51    | CLOSED| OPEN  | CLOSED    ---+
               *    | Special | OPEN  | CLOSED| CLOSED
              **    | Address | CLOSED| CLOSED| CLOSED
                    | mark    |       |       |

 *   Special sector switch setting that can be factory configured to
     customer requirements. Default is 1024 B/Sect. and 38 Sectors

 **  Soft Sector operation selection.
     The WREN 6 HH supports the use of the soft sector format. To
     implement the optional soft sectored format operation select
     "Address Mark" mode in the WREN 6 HH by installing option jumper
     plugs 2, 3, and 4.

 *** Custom setting is reserved for factory configuration to customer
     requirements.

J2 Motor Start on command
--------------------------

    5      OPEN    Spindle motor starts on power-up
           CLOSED  Spindle motor start command required to start motor

J8 Drive select
-----------------

        Drive    1     2     3
        ------+-----+-----+-----+
          0   |OPEN |OPEN |OPEN | Not Valid
          1   |CLOSE|OPEN |OPEN |
          2   |OPEN |CLOSE|OPEN |
          3   |CLOSE|CLOSE|OPEN |
          4   |OPEN |OPEN |CLOSE|
          5   |CLOSE|OPEN |CLOSE|
          6   |OPEN |CLOSE|CLOSE|
          7   |CLOSE|CLOSE|CLOSE|

Pins on the drive ID select and configuration select header are
provided to facilitate manual drive configuration. No devices other
than jumpers should be connected to these pins. Connection made to
external devices (Switches, Connectors, etc.) could result in adverse
affect drive performance. Exact location of these pins and header
may be changed without notice.

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 main PWA. The jumpers are installed in a 1
       through 7 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 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.

Install

SEAGATE ST2182E/ST2383E PRODUCT MANUAL 77765369-C

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

Drive Orientation
-----------------
The balanced rotary arm actuator design of the Wren 6 HH allows it to
be mounted in any orientation. All drive performance characterization
however, has been done with the drive in horizontal (disc level) and
vertical (drive on its side) orientations, and these are the two
preferred mounting orientations.

WREN 6 HH is designed, manufactured, and tested with a "Plug-in and
Play" installation philosophy. This minimizes the requirements for
highly trained personnel to integrate the WREN 6 HH into an OEM's
system, whetherin a factory or field environment.

Mounting Holes
--------------
Mounting Holes (6-32 UNC-2B). Four on bottom, four on each side. Max.
screw length into chassis 0.125 in.

Front Panel
-----------
The WREN 6 HH is available with a black front panel. The panel has a
window through which a single red* LED shows from its mounting on the
Main PWA. The LED, when glowing, indicates the drive is selected. A
flashing LED indicates the presence of a nonrecoverable fault. A
fault indication is displayed irrespective of Drive Select status.

*Green or Amber LED indicator will be available, but must be
specified when ordering units.

Cooling
-------
Cabinet cooling must be designed by the customer so that the ambient
temperature immediately surrounding the WREN 6 HH will not exceed
temperature conditions. Specific consideration should be given to
make sure adequate air circulation around the components on the PWAs.

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

 View A
    +---------------------Host-Controller---------------------+
    |                                                         |
    |Data Control   Data Control  Data Control   Data Control |
    +--+-----+--------+-----+--------+-----+--------+-----+---+
       |     |        |     |        |     |        |     |
       |     |        |     |        |     |        |     |
       |     |        |     |        |     |        |     |
       |     |        |     |        |     |        |     |
    +-++-+--++-+-+ +-++-+--++-+-+ +-++-+--++-+-+ +-++-+--++-+-+
    | |T |  |*T| | | |T |  |*T| | | |T |  |*T| | | |T |  |*T| |
    | +--+  +--+ | | +--+  +--+ | | +--+  +--+ | | +--+  +--+ |
    |WREN OR ESDI| |WREN OR ESDI| |WREN OR ESDI| |WREN OR ESDI|
    +------------+ +------------+ +------------+ +------------+

    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.
    WREN data cables 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 radially 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 WREN 6 HH Disc
Drive.

 View B
    +--------------Host Controller-------------+
    |                                          |
    |Data Control   Data          Data         |
    +-+------+-------+--------------+----------+
      |      |       |              |
      |      |       |              |
      |      |       |              |
      |      +-**----+-------+------+-------+
    +++-+----+---+ +++-+-----+--+ +++-+----++-++
    ||T |        | ||T |        | ||T |    |*T||
    |+--+        | |+--+        | |+--+    +--+|
    |WREN OR ESDI| |WREN OR ESDI| |WREN OR 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.
   WREN data ports are permanently terminated.
   ** A maximum of 7 devices may be interconnected

Daisychain Configuration
------------------------
A diasychain configuration incorporates a maximum of seven drives in
parallel on a common control cable. Only the drive selected by the
host system has its control and data signals enabled through this
common interface. View B illustrates a daisy-chain of WREN 6 HH Disc
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 WREN 6 HH receives DC power through a 4 pin right angle connector
mounted on the main circuit board. Recommended part number for 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)

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 back side of the printed
circuit board. The even pins are on the front side (down) side of the
printed circuit board. A key slot is provided between pins 3 and 5.
Seagate recommends keying this connector to prevent installing it
upside down. However, the WREN 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

Control 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 back (up) side of the
printed circuit board and are connected to the ground plane. The even
pins are on the front (down) side of the printed circuit board. A key
slot is provided between pin 3 and 5. Seagate recommends keying this
connector to prevent installing it upside down. However, the WREN
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:          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)

Interface Drivers/Receivers
---------------------------
The WREN 6 HH uses two types of signals; single ended and balanced
differential. The data and clock signals use balanced differential
drivers and receivers. All other signals use single ended drivers and
receivers.

Single Ended Drivers/Receivers
-------------------------------
Transmitter Characteristics
The WREN 6 HH uses the 74F38 open collector buffer/driver to transmit
status to the host. This driver is capable of sinking a current of
48 mA with a low-level output voltage of 0.7V.

Receiver Characteristics
The WREN 6 HH uses the 74LS14 Hex Inverter with hysteresis gate as a
line receiver. The input of each receiver is terminated in a 150 ohm
pullup resistor.

Terminator Characteristics
The terminator is a resistor module that plugs into a socket in the
last drive in a daisychain. Each drive is furnished with a
terminator. Terminators must be removed from all except the last
drive on the cable prior to daisychain operation. An equivalent
terminator must be provided in the controller on each input signal
line from the drive to the controller. Only the control cable
resistor module is removable.

 Balanced Differential Drivers/Receivers
 ---------------------------------------
 Transmitter Characteristics
 The WREN 6 HH uses 8923 balanced differential driver. An assertion on
 the interface is defined when "+" output is more positive than the
 "-" output.

 Receiver Characteristics
 ------------------------
 The WREN 6 HH uses 8923 type balanced differential receivers. An
 assertion one 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. An equivalent terminator must be provided in the controller
on each input signal line from the drive to the controller.

Features

SEAGATE ST2182E/ST2383E PRODUCT MANUAL 77765369-C

General Description
-------------------
The WREN 6 HH 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 94246 WREN 6 HH supports the Enhanced Small Device
Specification (77738076). This product specification was created to
be used in conjunction with this industry standard interface
specification.

Standards
---------
The WREN 6 HH has been developed as a system peripherals to the
highest standards of design and construction. The WREN 6 HH depends
upon its 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 WREN 6 HH complies with Seagate standards.

The WREN 6 HH, as delivered, is designed for system integration
before use.

The Head/Disc/Actuator Assembly (HDA) is environmentally sealed at
the factory. Air is recirculated within the HDA through a nonreplace-
able filter to maintain a contamination free HDA environment.

The WREN 6 HH uses a dedicated landing zone at the innermost radius
of the media thus eliminating the possibility of destroying or
degrading data by landing in the data zone.

The WREN 6 HH incorporates an automatic shipping look which prevents
potential damage to the heads and discs caused by movements during
shipping and handling. The shipping lock is automatically disengaged
when power is applied to the drive.

The WREN 6 HH decodes Track 0 location from the dedicated servo
surface thereby eliminating mechanical transducer adjustments and
related reliability concerns.

The WREN 6 HH uses a high performance actuator assembly consisting
of a low inertia, balanced, patented, straight arm design which
provides excellent performance with minimum power dissipation.

Media Description
-----------------
The media used on the WREN 6 HH has a diameter of approximately 5
inches (130 mm). The aluminum substrate is coated with a thin film
magnetic material, overcoated with a proprietary protective layer for
improved durability and environmental protection.
Each data surface has a total of 1747 tracks and is capable of
recording 54,716,040 bytes of unformatted data.

 Media defects are characterized as correctable or uncorrectable de-
 pending on the type and magnitude of the media flaw. Various error
 correction codes may be implemented. The code chosen should be
 consistent with Seagate media testing and certification methods.
 WREN 6 HH 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 WREN 6 HH 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 WREN 6 HH
recording surfaces meet the following requirements.

       1. 1747 total tracks per surface.

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

       3. 50 defects per surface maximum.

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

Defect and Error Management
---------------------------
The WREN 6 HH, as delivered, complies with 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 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.

The WREN 6 HH defect list is written on maximum track, maximum track
minus eigth and a special track 4095 (OFFF)

Custom Formatting
-----------------
The WREN 6 HH is formatted during production. Seagate 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 (negated) (0) 2.5 V; 5.25 V 2.0 V; 5.25 V
Low (asserted) (1) 0.7 V; 0.0 V 0.8 V; 0.0 V

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

Seek Time
---------

                                          |WREN 6HH|
        ----------------------------------+--------+
        Track-to-Track         msec. typ. |   3    |
                               msec. max. |   5    |
                       Average msec. typ. |  16    |
                       Average msec. max. |  18    |
        Latency                msec. avg. |   8.35 |
        ----------------------------------+--------+
 Seek time is defined as the elapsed time from the receipt of a seek
 command until the drive signals the controller that it is ready to
 perform another seek or a 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 3592 0.5% r/min. The speed tolerance includes
motor performance and motor control circuit tolerances.

The average latency time is 8.35 milliseconds, based on a nominal
disc speed of 3592 r/min. The maximum latency time is 16.79 milli-
seconds based on a minimum disc speed of 3574 r/min.

Read Data Transfer Rate
-----------------------
The nominal read serial data transfer rate is 15.0 Mbits per second.

Power Sequencing
----------------
Power sequencing is not required for the WREN 6 HH. The drive
protects against inadvertent writing during power up and down.
Daisychain operation requires that power be maintained on the
terminated WREN 6 HH to ensure proper termination of the peripherals
I/O cables.

Temperature
-----------
50*F to 122*F (10*C to 50*C) operating ambient with a maximum
gradient of 18* F (10* C) per hour. Above 1000 feet (305 metres)
altitude the maximum temperature is derated linearly to 122*F
(44.4*C) at 10,000 feet (3048 metres). Cabinet packaging designs
must provide ample air circulation around the WREN 6 HH to ensure
environmental limits are not exceeded as a result of heat transfer
from other system components. Operating ambient specifications
purposes is defined as the environment immediately surrounding the
WREN 6 HH. The temperature of the HDA is restricted to a maximum of
142*F (61.4*C) during operations. System cooling consideration should
avoid large (>5*F or 2.8*C) thermal gradients between points A and B.

Reliability
-----------
The following reliability specifications assume correct host/drive
operational interface, including all interface timings, power supply
voltages, and environmental conditions.

MTBF 40,000 hours
Service Life 5 years
Preventive Maintenance None required













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