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Hard Drive: CDC: WREN IIIHH 94216-106 94MB 5.25"/HH ESDI




W R E N   I I I H H   9 4 2 1 6 - 1 0 6    CDC
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders    1024|     |     |
Capacity form/unform    94/  106 MB        Heads           5|     |     |
Seek time   / track  18.0/ 4.0 ms          Sector/track   34|     |     |
Controller           ESDI                  Precompensation
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          15.0 W     Shock        g         2       |     32
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h      40000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     CSA,SDA,FCC,IEC380,UL478,VDE

Layout

SEAGATE ST2106E PRODUCT MANUAL 77765276-E

  +---------------------------------------------------------+
  |                                      Option 1----+      |XX
  |                                      Select +----+      |XXData
  |                                      Header             |XXCable
  |                                                         |X1
  |                                                         |
  |                                                     ++  |XX
  |                                           Terminator||  |XXControl
  |                                           Resistor  ||  |XXCable
  |                                           Pack      ||  |XX
  |                                                     ++  |XX
  |                                                         |X1
  |                                                         |
  |                                                         |+-+Drive
  |                                                         || |Select
  |                                                         |+-1
  |                                                         |X1 Power
  |                                                         |XX
  +---------------------------------------------------------+

Jumpers

SEAGATE ST2106E PRODUCT MANUAL 77765276-E

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

x = Jumper set at factory

Drive Select Header
-------------------

        +------------+
        | o  o  o  o |
        | o  o  o  o |
        +------------+
          T  4  2  1 (Drive logical address
                      jumper positions)

T = Test Seek Jumper position
Jumper must not be installed during normal operation.

Select Jumper 1 Jumper 2 Jumper 4
-------------------------------------------------
Drive select 0 OPEN OPEN OPEN
Drive select 1 CLOSED OPEN OPEN
Drive Select 2 OPEN CLOSED OPEN
Drive Select 3 CLOSED CLOSED OPEN
Drive Select 4 OPEN OPEN CLOSED
Drive Select 5 CLOSED OPEN CLOSED
Drive Select 6 OPEN CLOSED CLOSED
Drive Select 7 CLOSED CLOSED CLOSED

Drive Select 0 is not valid!

Drive ID is binary coded by jumper position (most significant bit on
left), i.e., jumper in position 4 would be Drive Logical Address 4,
no jumper means Logical Address 0, which is not a Valid Address in
the ESDI System.

Note: Pins on the Drive Select and Configuration Select Header are
provided to facilitate manual drive configuration. No devices other
than jumpers should be connected to these pins. Connection to
external devices (switches, connectors, etc.) could adversely affect
drive performance. Exact location of these pins and headers may
change without notice.

 Option Select Header
 --------------------
 x Plug-1  CLOSED  Motor start on power up
           OPEN    Motor start with CMD

When the jumper plug-1 is installed, a Motor ON command is required
from the controller to start the spindle motor. When power is applied
to the drive, the drive will generate an Attention signal and assert
Standard Status Bits 8 and 9 signifying "Power On Reset Conditions
Exist" and "Spindle Motor Stopped". The controller must then respond
with a command to Reset the interface Attention line, and the Start
Motor command in order to start the spindle motor.

Note: This procedure is required anytime the "Power On Reset
Condition Exists" status bit is received by the controller if the
"Motor Control Implemented" jumper plug is installed.

 Option Select Header
 --------------------
                       Plug-2  Plug-3  Plug-4   Sectors per Track
   Fixed Sector Mode   CLOSED  CLOSED  CLOSED         64
   Select and          CLOSED  OPEN    CLOSED         36
 x Default Sector      OPEN    OPEN    CLOSED         34
   Size                OPEN    CLOSED  CLOSED         35*
                       OPEN    CLOSED  OPEN           19*

       OR

   Address Mark Mode   OPEN    OPEN    OPEN     Soft Sector Operation
   Select

All other jumper combinations are undefined.

* 4th Qtr. 1987. Exact date TBD.

Soft Sector Option
------------------
The WREN III supports the use of the soft sector format as described
in the CDC ESDI Specification, 77738076, Section 5.4.4.

To implement the optional soft sectored format operation, select
"Address Mark" mode in the WREN III HH by installing option jumper
plugs 2, 3, and 4.

 DC Power and pin connector assignments
 --------------------------------------
      +------------+   pin 1    +12 V
      | 1  2  3  4 |   pin 2    +12 Volts Return
      +------------+   pin 3    + 5 Volts Return
                       pin 4    + 5 V

Install

SEAGATE ST2106E PRODUCT MANUAL 77765276-E

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!

Drive Orientation
-----------------
Only two drive mounting orientations are permitted: discs in the
horizontal plane and discs in the vertical plane. Horizontal mounting
with the front raised at an angle of 15* is acceptable. Mounting with
with either end down (front or rear) or upside down is not
permissible. It is recommended that data written in a given orienta-
tion be read in that same orientation.

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

Cooling
-------
Cabinet cooling must be designed by the customer so that the ambient
temperature immediately surrounding the WREN III HH will not exceed
temperature conditions. Specific consideration should be given to
make sure adequate air circulation is present around the PWAs at the
rear of the drive.

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 cable control 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.

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 (3.0 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 III 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 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 daisychain of WREN III HH 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).

Service Tools
-------------
No special tools are required for site installation or recommended
for site maintenance. The depot repair philosophy od WREN III HH
precludes the necessity for special tools. If field repair of items
external to the HDA is desired, a 6 point Torx driver is required
(T10). It may be purchased through most commercial tools catalogs.

DC Cable and Connector
----------------------
The WREN III HH receives DC power through a 4 pin right angle
connector mounted on the main circuit board. Recommended part number
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)

System Ground Quick Connect Terminal
------------------------------------
System ground may be connected to the Quick connect terminal.
Recommended part numbers for this connector and the mating ground
cable connector are listed, but equivalent parts may be used.

Drive Connector Terminal: AMP P/N 61664-1
Cable Connector Terminal: AMP P/N 62137-2

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 front (component) side of
the printed circuit board. The even pins are on the noncopmponent
side of the main printed circuit board. A key slot is provided
between pins 3 and 5. CDC 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.

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
 Strain Relief:      3M-3448-54
 Cable:              Flat Cable (Stranded AWG 28) 3M-3365-20
                     Flat Cable (Stranded AWG 28) 3M-3517-20 (Shielded
                     Cable)
 Key:                AMP 583274-1, 3M-3439-2

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 front (component) side of
the main printed circuit board and are connected to the ground plane.
The even pins are on the front noncomponent side of the printed
circuit board. A key slot is provided between pin 3 and 5. CDC
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 provided, but
equivalent parts may be used.

 Connector:          34 pin, 3M-3463-0001, AMP 111109-3
 Strain Relief:      3M-3448-56
 Key:                AMP 583274-1, 3M-3439-2
 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 III 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 III HH uses the 7406 open collector hex inverter to buffer/
driver 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 WREN III HH uses the 74LS14 Hex Inverter with hysteresis gate as
a line receiver. The input of each receiver is terminated in a 150ohm
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 III HH uses 75158 or equivalent type balanced differential
 drivers. An assertion on the interface is defined when the "+" output
 is more positive than the "-" output.

 Receiver Characteristics
 The WREN III HH uses 75157 or equivalent 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 ST2106E PRODUCT MANUAL 77765276-E

Standards
---------
The WREN III HH has been developed as a system peripherals to the
highest standards of design and construction. The WREN III HH 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 WREN III HH complies with CDC standards.

The WREN III HH is a UL Recognized component per UL478 and a CSA
Certified Component per CSA C22.2, No. 220-M1986. It also meets the
requirements of DIN IEC 380/VDE 0806/8.81 and EN 60 950/1.1.88

The WREN III HH, 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 end the Radio Interference Regulations of the Canadian
Department of Communications EMI of computing devices.

General Description
-------------------
The WREN III 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 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 disc/actuator
environment.

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

The WREN III 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 in the WREN III 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 abd environmental protection.

Each data surface has a total of 1024 tracks and is capable of
recording 21,381,120 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 Control Data media testing and certification methods.
WREN III 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 III 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 III
HH recording surfaces will meet the following requirements.

       1. 1024 total tracks per surface.

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

       3. 30 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 III HH, 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
reallocated 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
recommended since most of the defects are recoverable with ECC. If
ECC is not used, defects are usually unrecoverable and need to be
reallocated as they are discovered.

Custom Formatting
-----------------
The WREN III HH 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.

Driver/Receiver Characteristics
-------------------------------
Interface signal levels and logical sense at the WREN I/O connector
are defined as follows:

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
---------

        ----------------------------------+---------+
        Track-to-Track         msec. typ. |   4     |
                               msec. max. |   6     |
                       Average msec. typ. |  18     |
                       Average msec. max. |  20     |
        Max. Seek Time (1024)  msec. typ. |  35     |
                               msec. max  |  40     |
        Latency                msec. avg. |   8.34  |
        ----------------------------------+---------+

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 times for
all possible movements by the total number of movements.

Spindle Speed and Latency
-------------------------
The spindle speed is 3597 0.5% r/min. The speed tolerance includes
motor performance and motor control circuit tolerances.

The average latency time is 8.34 milliseconds, based on a nominal
disc speed of 3597 r/min. The maximum latency time is 16.76 milli-
seconds based on a minimum disc speed of 3579 r/min.

Read Data Transfer Rate
-----------------------
The read serial data transfer rate is 10.0 Megabits per second.

Start/Stop Time
---------------
The WREN III HH will become ready less than 28 seconds after
application of DC power. Stop time will be less than 30 seconds after
removal of DC power.

There is no power control switch on the WREN III HH.

Power Sequencing
----------------
Power sequencing is not required for the WREN III HH. The drive
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* 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 112* F
(44.4*C) at 10,000 feet (3048 metres). Cabinet packaging designs must
provide ample air circulation around the WREN III HH to ensure
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
WREN III HH. The temperature of the HDA is restricted to a maximum of
142*F (61.4* C) during operation.

Heat/Power Dissipation
----------------------
Each WREN III HH will dissipate no more than 25.0 watts of DC power
average. Typical power dissipation under idle operating conditions is
less than 15 watts.

Air Cleanliness
---------------
The WREN III HH is designed to operate in a typical office
environment with minimum environmental control.

Front Panel
-----------
The WREN III HH is available with a black front panel. The panel has
a window through wich 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 presense of a nonrecoverable fault. A
fault indication is displayed irrespective of Drive Select status.

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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