
M D - 2 0 6 5 X T    AREAL
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 2.5"/SUPERSLIMLINE    Cylinders    1024| 1024|     |
Capacity form/unform    62/      MB        Heads           2|    7|     |
Seek time   / track  15.0/ 4.0 ms          Sector/track     |   17|     |
Controller           IDE / XT              Precompensation
Cache/Buffer            32 KB              Landing Zone
Data transfer rate    1.500 MB/S int       Bytes/Sector      512
                      6.500 MB/S ext
Recording method     RLL 2/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5 V          Temperature *C         5 55    |    -40 60
Power: sleep          0.1 W     Humidity     %         8 80    |      8 80
       standby        0.1 W     Altitude    km    -0.061  3.048| -0.061 12.192
       idle           2.0 W     Shock        g        20       |    125
       seek           2.0 W     Rotation   RPM      2504
       read/write     2.0 W     Acoustic   dBA        35
       spin-up        3.3 W     ECC        Bit   56
                                MTBF         h     100000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     CSA,TUV,UL1950               

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                        L   A   Y   O   U   T
**********************************************************************
AREAL    MD-2085/65  TECHNICAL MANUAL REVISION 1.0 SEPTEMBER 1, 1992

  +---------------------------------------------------------+
  |                                                  1++++3 |
  |                                                   ++++  |XX44
  |                                                     2   |XX
  |                                                         |XX
  |                                                         |XX
  |                                          4++++6         |XX
  |                                           ++++          |.X KEY
  |                                             5           |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX2
  |                                                         |
  |                                                         |XX
  |                                                         |  50
  +---------------------------------------------------------+




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                      J   U   M   P   E   R   S
**********************************************************************
AREAL    MD-2085/65  TECHNICAL MANUAL REVISION 1.0 SEPTEMBER 1, 1992

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

 There are six, user configurable jumper options located on the
 PCBA.


 PIN 1 - Master/Slave
 --------------------
 1  CLOSED  Drive is MASTER (default)
    OPEN    Drive is SLAVE

 When pin 1 installed, the drive will respond as drive #1. When
 removed, the drive will respond as drive #2. If you have a slave
 drive, there must be a master, otherwise your system will hang.


 PIN 2 - PDIAG
 -------------
 2  CLOSED  Active Low

 PDIAG - This signal is used to signify to a master drive that the
 slave drive has passed its internal diagnostics, and is ready for
 operation. The CAM specification call for this signal to be active
 high, however, the defactor standard is for this line to be active
 low. When the PDIAG jumper is installed, it is active low.


 PIN 3 - Reserved
 ----------------
 Spare - This pin is reserved for future requirements.


 PIN 4 - IOCHRDY
 ---------------
 4  CLOSED  IOCHRDY is available

 IOCHRDY - This signal is used to extend the IOR and IOW phases of
 data transfer, thereby slowing the system transfer speed to match the
 drive's maximum buffer rate. This allows a drive of any buffer speed
 to run in any high speed system. When installed, IOCHRDY is
 available.


 PIN 5 - DACK
 ------------
 DACK - This signal is sent by the Host to initiate a DMA transfer
 once the drive has activated its DRQ signal.


 PIN 6 - DREQ
 ------------
 This signal is sent by the drive to indicate that it has data ready
 to send.


   +--------+----+-------+-------+-------+-------+
   |SIGNAL  |PIN |AT PIO |AT DMA |XT PIO |XT DMA |
   +--------+----+-------+-------+-------+-------+
   |IOCHRDY | 4  | *--*  | *--*  | *  *  | *  *  |
   |        |    |       |       |       |    |  |
   |DACK    | 5  | *  *  | *--*  | *--*  | *  *  |
   |        |    |       |       |       | |     |
   |DREQ    | 6  | *  *  | *--*  | *--*  | *  *  |
   +--------+----+-------+-------+-------+-------+



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                      I   N   S   T   A   L   L
**********************************************************************
AREAL    MD-2085/65  TECHNICAL MANUAL REVISION 1.0 SEPTEMBER 1, 1992

 Notes on Installation
 =====================

 Recommend Mounting Configuration
 --------------------------------

     horizontally                           vertically
   +-----------------+             +--+                       +--+
   |                 |             |  +-----+           +-----+  |
   |                 |             |  |     |           |     |  |
 +-+-----------------+-+           |  |     |           |     |  |
 +---------------------+           |  |     |           |     |  |
                                   |  |     |           |     |  |
                                   |  |     |           |     |  |
 +---------------------+           |  +-----+           +-----+  |
 +-+-----------------+-+           +--+                       +--+
   |                 |
   |                 |
   +-----------------+

 This drive is designed to be used in applications where the unit may
 experience extreme levels of both shock and vibration. There are no
 limits on mounting orientation and mounting clearance is not re-
 quired. Maximum insertion length of the 3mm x .5 screws is 0.15"
 (3.8mm).


 Physical Connection - AT Interface
 ----------------------------------
 Both power and control signals are supplied to the drive through a
 single 44 pin cable. Please note that separate power is supplied to
 the logic and motor circuits to minimize noise coupling.

 Maximum length of this 44 pin cable is 18 inches (457 mm) since it is
 TTL driven. Two drives may be daisy chained on this cable, however,
 the cable remains restricted to 18 inches.

 Recommended mating connectors are as follows:

       +--------------------+------------+--------------------+
       | Connector Style    | Dupont     | Elco               |
       +--------------------+------------+--------------------+
       | Flex Cable Straight| 86456-044  | N/A                |
       +--------------------+------------+--------------------+
       | Ribbon Cable       | N/A        | 20-8394-2044-04-101|
       +--------------------+------------+--------------------+
       | PCBA Straight      | 86455-044  | 20-8390-2044-00-101|
       +--------------------+------------+--------------------+
       | PCBA Right Angle   | 88333-044  | 20-8390-2044-01-101|
       +--------------------+------------+--------------------+


 Electrical Description - AT Interface
 -------------------------------------
 All signal levels are TTL compatible. A logic "1" is from 2.0 volts
 to 5 volts. A logic "0" is from 0.0 volts to 0.7 volts.

 The interface between the drive adapter and the drive is termed the
 "Host Interface". The set of registers in the I/O space of the Host
 is known as the "Task File".

 All signals on the Host Interface have the prefix Host. All negativ-
 ely active signals are prefixed with a "-" designation. All positiv-
 ely signals are prefixed with a "+" designation. Signals whose source
 is the Host are "outbound" and those whose source is the drive are
 "inbound".

      +------+-------------------+------+----------------+
      | Pin  | Signal            | Pin  | Signal         |
      +------+-------------------+------+----------------+
      | 01   | -Host Reset       | 02   |  Gnd           |
      | 03   | +Host Data 7      | 04   | +Host Data  8  |
      | 05   | +Host Data 6      | 06   | +Host Data  9  |
      | 07   | +Host Data 5      | 08   | +Host Data 10  |
      | 09   | +Host Data 4      | 10   | +Host Data 11  |
      | 11   | +Host Data 3      | 12   | +Host Data 12  |
      | 13   | +Host Data 2      | 14   | +Host Data 13  |
      | 15   | +Host Data 1      | 16   | +Host Data 14  |
      | 17   | +Host Data 0      | 18   | +Host Data 15  |
      | 19   |  Gnd              | 20   |  Key           |
      | 21   | -DREQ             | 22   |  Gnd           |
      | 23   | -Host IOW         | 24   |  Gnd           |
      | 25   | -Host IOR         | 26   |  Gnd           |
      | 27   | -IOCHRDY          | 28   |  Not Connected |
      | 29   | -DACK             | 30   |  Gnd           |
      | 31   | +Host IRQ         | 32   | -Host IOCS16   |
      | 33   | +Host Address 1   | 34   | -Host PDIAG    |
      | 35   | +Host Address 0   | 36   | +Host Address 2|
      | 37   | -Host CS0         | 38   | -Host CS1      |
      | 39   | -Host Active/Slave| 40   |  Gnd           |
      | 41   | +5 Volt Logic     | 42   | +5 Volt Motor  |
      | 43   |  Gnd              | 44   | +AT /-XT       |
      +------+-------------------+------+----------------+


 Electrical Description - XT Interface
 -------------------------------------
 All interface signal levels are TTL compatible. A logic "1" is from
 2.0 volts to 5 volts. A logic "0" is from 0.0 volts to 0.7 volts. All
 output signals have 24 ma maximum drive capability.

 The interface between the drive adapter and the drive is called the
 "Host Interface". The set of registers in the I/O space of the Host
 is known as the "Task File". All signals on the Host Interface have
 the prefix Host. All negatively active signals shall be further
 prefixed with a (-) designation. All positively active signals shall
 be without prefix or prefixed with a (+).

 The pin assignment within the fourty-four pin Host Interface cable
 are shown in following table. The direction of signal propagation is
 indicated by a "I" for signals originating from the drive and "O"
 for signals originating from the Host.


      +------+-------------------+------+----------------+
      | Pin  | Signal            | Pin  | Signal         |
      +------+-------------------+------+----------------+
      | 01   | +Host Reset       | 02   |  Gnd           |
      | 03   | +Host Data 7      | 04   |  Not Used      |
      | 05   | +Host Data 6      | 06   |  Not Used      |
      | 07   | +Host Data 5      | 08   |  Not Used      |
      | 09   | +Host Data 4      | 10   |  Not Used      |
      | 11   | +Host Data 3      | 12   |  Not Used      |
      | 13   | +Host Data 2      | 14   |  Not Used      |
      | 15   | +Host Data 1      | 16   |  Not Used      |
      | 17   | +Host Data 0      | 18   |  Not Used      |
      | 19   |  Gnd              | 20   |  Key           |
      | 21   | +AEN              | 22   |  Gnd           |
      | 23   | -Host IOW         | 24   |  Gnd           |
      | 25   | -Host IOR         | 26   |  Gnd           |
      | 27   | -DACK             | 28   |  Not Connected |
      | 29   | +DRQ              | 30   |  Gnd           |
      | 31   | +Host IRQ         | 32   |  Not Used      |
      | 33   | +Host Address 1   | 34   |  Not Used      |
      | 35   | +Host Address 0   | 36   |  Not Used      |
      | 37   | -Host CS0         | 38   |  Not Used      |
      | 39   | -Active           | 40   |  Gnd           |
      | 41   | +5 Volt Supply    | 42   | +5 Volt Supply |
      | 43   | +5 Volt Return    | 44   | +AT /-XT       |
      +------+-------------------+------+----------------+


 Functional Description
 ----------------------
 The MD-2085/65 contains all necessary mechanical and electronic parts
 to interpret control signals, position the heads, read and write
 data, and provide a contaminant free environment for the heads and
 disks.


 Air Filtration System
 ---------------------
 Inside the HDA, air is recirculated through a .3 micron filter,
 providing a clean environment for the recording heads and disks.


 Drive Mechanism
 ---------------
 A brushless DC motor rotates the spindle at 2504 RPM. Back EMF of the
 motor is used to quickly stop the spindle when power is removed.


 Read/Write Heads and Disks
 --------------------------
 Data is recorded on a single 65 mm diameter glass disk using long-
 itudinal thin film heads.



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
AREAL    MD-2085/65  TECHNICAL MANUAL REVISION 1.0 SEPTEMBER 1, 1992

 Introduction
 ------------
 The Areal Model MD-2065 is a 2.5 inch, high capacity, ruggedized,
 high performance, low power disk drive. By design, it is idel for
 notebook, laptop, or portable applications.

 The MD-2065 incorporates the IBM PC-AT/XT Task File control logic and
 requires only chip select decode logic to allow bus connection. This
 logic is included in a number of commercially available adapter
 boards.


 Key Features
 ------------
 - Automatic Error Correction and Retries

 - Automatic Microprocessor Controlled Diagnostics

 - Buffer Size 32 KB

 - Embedded Servo System

 - Extremely Low Power Requirement

 - Fast Startup

 - Internal Air Filtration System

 - Master/Slave Combatibility

 - Programmable Low Power Modes

 - 125 G Non-Operation Shock Tolerance


 Error Correction
 ----------------
 The MD-2065 employs a 56 bit ECC polynomial capable of correcting
 single burst errors up to 21 bits. Single burst errors up to 56 bit
 and double burst errors up to 41 bits can be detected.


