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Hard Drive: IBM: 10MB 5.25 10MB 5.25"/FH MFM ST412




1 0 M B   5 . 2 5    IBM
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders     306|     |     |
Capacity form/unform    10/   12 MB        Heads           4|     |     |
Seek time   / track  99.9/     ms          Sector/track   17|     |     |
Controller           MFM / ST412           Precompensation   128
Cache/Buffer               KB              Landing Zone
Data transfer rate    0.625 MB/S int       Bytes/Sector      512
                      0.625 MB/S ext
Recording method     MFM                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         4 46    |        57
Power: sleep              W     Humidity     %         8 80    |      8 80
       standby            W     Altitude    km                 |
       idle          22.7 W     Shock        g                 |
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h       8000
                                Warranty Month
Lift/Lock/Park     NO           Certificates

Layout

MINISC. 1006/1012 PRODUCT MANUAL MSI/002/981

  +---------------------------------------------------------+
  |                                                         |XX
  |                                             Shunt--+    |XX
  |                                                 |  |    |XX J1
  |                                                 |  |    |XX
  |                                                 +--1    |XX
  |                                                         |XX
  |                                                         |XX
  |                                                  +-+    |
  |                                         Terminator |    |
  |                                                  | |    |XX Power
  |                                                  | |    |XX J3
  |                                                  +-1    |
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX J2
  |                                                         |XX
  |                                                         |XX
  +---------------------------------------------------------+

Jumpers

MINISC. 1006/1012 PRODUCT MANUAL MSI/002/981 ISSUE 0

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

Drive Selection
---------------
As shipped, the 16-pin shunt block has all pin pairs shorted with the
"Radial" option selected. To select the desired drive number in a
daisy-chain operation, refer to the following table.

                      Drive select number
 Pin    Pair       1      2      3      4
 ---------------------------------------------
  8   -   9        CLOSED OPEN   OPEN   OPEN
  7   -  10        OPEN   CLOSED OPEN   OPEN
  6   -  11        OPEN   OPEN   CLOSED OPEN
  5   -  12        OPEN   OPEN   OPEN   CLOSED
  1   -  16        OPEN   OPEN   OPEN   OPEN

Radial Option
-------------
As shipped, the 16-pin shunt block has pin pair 1/16 shorted result-
ing in a radial operation. In this case, all input and output signals
are enabled, even if the drive is not selected. However, the front
panel LED will not be on. -DRIVE SELECT must be active to light the
LED. When pin pair 1/16 is open the drive is in a daisy chain mode
where output signals are active when the appropriatte -DRIVE SELECT
line is activated.

Half Step Option
----------------
As shipped, the 16-pin shunt block has pin pair 4/13 shorted. In this
case, step pulses are applied to the interface at an interval of 1.75
milliseconds. Openin gpin pair 4/13 alloes a significant decrease in
access time when used in conjunction with the simple software
algorithm provided by the controller.

Controller Reset Option
-----------------------
As shipped, the 16-pin shunt block has pin pair 3/14 shorted. In this
case -WRITE FAULT conditions cannot be reset by the controller.
Opening pin pair 3/14 allows the controller to reset -WRITE FAULT by
deselecting the drive. This function is valid whether or not the
"Radial" option is selected.

Terminators
-----------
Each drive is shipped with a terminator pack providing the 220/330
ohm termination for the Control Input Signals. If multiple drives are
configured, the terminator pack must be removed from all drives
except the last unit on the daisy chain.

Install

MINISC. 1006/1012 PRODUCT MANUAL MSI/002/981 ISSUE 0

Installation routines
=====================

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!

Mounting
--------
The drive should be mounted to the customer frame through the
mechanically isolated mounting points on the bottom or sides of the
drive using 6-32 machine screws, 1/4 inch maximum penetration. The
customer should allow adequate ventilation to the drive to insure
reliable drive operation over the operating temperature range.

Mechanically isolated mounting points
-------------------------------------
Four side mounting and four base mounting points are provided to the
customer. Each mounting point is mechanically isolated from the
drive.

Cabling
-------
Connect interface cables with connectors P1, P2, P3 and P4 to to J1,
J2, J3 and J4 respectively. If multiple drives are to be inter-
connected, remove the terminator packs in all but the last drive of
the daisy chain.

J1/P1 Control Signal Connector
------------------------------
Connection to J1 is through a 34 pin PCB edge connector. The pins are
numbered 1 through 34 with the even pins located on the component
side of the R/W and Logic Board Assembly. A key slot is provided
between pins 4 and 6.

The recommended mating connector (P1) is AMP Ribbon Connector P/N
88373-3.

J2/P2 Data Signals Connector
----------------------------
Connection to J2 is through a 20 pin edge connector. The pins are
numbered 1 through 20 with the even pins located on the component
side of the R/W and Logic Board Assembly. A key slot is provided
between pins 4 and 6.

The recommended mating connector (P2) is AMP Ribbon Connector
P/N 88373-6.

P3 DC Power Connector
---------------------
DC power connector (J3) is a 4 pin AMP Mate-N-Lok Connector P/N
350211-1 mounted in a cable extended 4 inches from the drive.

The recommended mating connector (P3) is AMP P/N 1-480424-0 utilizing
AMP pins P/N 350078-4.

       +------------+
       | 4  3  2  1 |
       +------------+

J4/P4 Frame Ground Connector
----------------------------
Fasten AMP P/N 61761-2.

Recommended mating connector is AMP P/N 62187-1.

If used, the hole in J4 will accommodate a wire size of 18 AWG max.

Electrical Interface
--------------------
The interface to the MiniScribe I can be divided into three
categories each of which is physically separated: Control Signals,
Data Signals and DC Power.

All control Signals are digital in nature (open collector TTL), and
either provide signals to the drive (input) or signals to the
collector (output). The Data Signals are differential in nature and
provide data either to (write) or from (read) the drive.

The interconnect cable between the drive and controller may be
flat ribbon or twisted pairs of a length not to exceed 20 feet. The
signal return lines and ground lines for J1 and J2 should be
grounded at the controller.

The voltage return lines of J3 should only be grounded at the power
supply.

Connector J4/P4 is a spade lug connector tied to frame ground.

Drive Mechanism
---------------
A brushless DC direct drive motor rotates the spindle at 3600 rpm.
The motor/spindle assembly is dynamically balanced to provide minimal
mechanical runout to the disks. A dynamic brake is used to provide a
fast stop to the spindle motor when power is removed.

Air Filtration System
---------------------
Within the sealed enclosure, a 0.3 micron filter coupled with a
breather filter provides over the drive life a clean, above
atmospheric pressure environment to the heads and disks.

Head Positioning Mechanism
--------------------------
Two or four read/write heads are supported by a carriage mechaism
coupled to the rotation stepper motor through a rack-and-pinion
motion translator. The rack-and-pinion translator allows for the
increased number of data tracks while retaining the full step holding
torque and positioning repeatability characteristics of the stepper
motor.

 Power Sequencing
 ----------------
 +5 volts DC and +12 volts DC may be applied in any order. The +5VDC
 should be applied within 15 seconds of the +12VDC to insure proper
 automatic Track 000 calibration.

 +12 VDC powers the spindle drive motor. The microprocessor verifies
 that the disks are spinning at 3600 rpm and then activates the
 automatic Track Zero positioning. -TRACK ZERO, -SEEK COMPLETE, and
 -READY will beome true upon completion of the Track Zero positioning
 sequence.

Cable Interconnection - 4 Drive System
--------------------------------------

   +-----------+                                +-----------------+
   |           +---o---Control------------------+J1     Drive 1   |
   |           |   |    +-------Data------------+J2               |
   |           |   |    |             +-Power---+J3  J4    ...    |
   |           |   |    |             |         +-----+-----------+
   |           |   |    |             |    +-Frame----+
   |           |   |    |             |    |    +-----------------+
   |Controller |   o----+-------------+----+----|J1     Drive 2   |
   |           |   |    | +-----------+----+----+J2               |
   |           |   |    | |           o----+----+J3  J4    ...    |
   |           |   |    | |           |    |    +----+------------+
   |           |   |    | |           |    o---------+
   |           |   |    | |           |    |    +-----------------+
   +-----------+   o----+-+-----------+----+----+J1     Drive 3   |
   |           |   |    | | +---------+----+----+J2               |
   |           +---+----+ | |         o----+----+J3  J4    ...    |
   |           +---+------+ |         |    |    +-----+-----------+
   |           |   |        |         |    o----------+
   |Data       +---+--------+         |    |    +-----------------+
   |Separator  |   +------------------+----+----+J1     Drive 4   |
   |           +----------------------+----+----+J2               |
   |           |                      o----+----+J3  J4    XXX    |
   +-----------+                      |    |    +-----+-----------+
                       DC voltages----+    o----------+
                                           |
                       Frame Ground--------+

... = Terminator Pack removed

XXX = Terminator Pack installed

Caution/Warning
---------------
The Miniscribe I is a precision product weighing 5.5 lbs.
During handling the unit must not be dropped, jarred or bumped.
Otherwise, damage to the heads and disks may occur.

Features

MINISC. 1006/1012 PRODUCT MANUAL MSI/002/981 ISSUE 0

Introduction
------------
The Miniscribe I is a 5 1/4 inch rigid media disk drive employing
Winchester technology. MiniScribe I is available in two models
providing respectively 6.4 and 12.8 MBytes of unformatted storage
capacity. Both models are identical except for the number of heads
and disks.

MiniScribe I employs the industry standard ST506 interface, employs
the same DC voltages and filts within the same physical form factor
as the 5 1/4 inch floppy drives.

Seek time
---------

 Linear                      |MiniScribe I
 ----------------------------+------------
 Single Track                |   1.75 ms
 Average                     | 179    ms (102 cylinders)
 Maximum                     | 534    ms
 Average Latency             |   8.33 ms
 ----------------------------+------------

 Software Scheduled          |MiniScribe I
 ----------------------------+------------
 Single Track                |   1.75 ms
 Average*                    | 125    ms
 Maximum*                    | 375    ms
 Average Latency             |   8.33 ms
 ----------------------------+------------

Settling Time 15 ms

Reliability and Maintenance
---------------------------
MTBF 8,000 hours (continuous operation)
MTTR 30 minutes
Preventive Maintenance None
Component Design Life 5 years

Media Defects Criteria
----------------------
Media defects as shipped from MiniScribe:

 Model 1006       10 defects maximum <2 bytes in length
                  Cylinder 000 defect free

 Model 1012       20 defects maximum <2 bytes in length
                  Cylinder 000 defect free.

Track 000 Detector
-------------------
The Track Zero Detector resides within the sealed enclosure. This
optical sensor consist of a light source (activated only when a seek
is initiated) and a receiver which when blocked by the positioner
assembly indicates the logical/physical track 000.

MFM Write Data
--------------
In MFM recording, to optimize data integrity and meet the error rate
specified, the write data presented by the controller must be pre-
compensated on all tracks.













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