M D - 2 0 8 5 X T AREAL
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 2.5"/SUPERSLIMLINE Cylinders | 705| |
Capacity form/unform 86/ MB Heads 2| 14| |
Seek time / track 16.0/ 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 0.6 W Altitude km -0.061 3.048| -0.061 12.192
idle 1.5 W Shock g 20 | 125
seek 1.8 W Rotation RPM 2504
read/write 1.8 W Acoustic dBA 35
spin-up 3.0 W ECC Bit 56
MTBF h 100000
Warranty Month
Lift/Lock/Park YES Certificates CSA,TUV,UL1950
**********************************************************************
L A Y O U T
**********************************************************************
AREAL MD-2085 USER'S GUIDE REVISION 1.0 MAY 1, 1991
+---------------------------------------------------------+
| 1++++3 |
| ++++ |XX44
| 2 |XX
| |XX
| |XX
| 4++++6 |XX
| ++++ |.X KEY
| 5 |XX
| |XX
| |XX
| |XX
| |XX2
| |
| |XX
| | 50
+---------------------------------------------------------+
**********************************************************************
J U M P E R S
**********************************************************************
AREAL MD-2085 USER'S GUIDE REVISION 1.0 MAY 1, 1991
Jumper Setting
==============
There are several, 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 | O--O | O--O | O O | O O |
| | | | | | | |
|DACK | 5 | O O | O--O | O--O | O O |
| | | | | | | |
|DREQ | 6 | O O | O--O | O--O | O O |
+--------+----+-------+-------+-------+-------+
**********************************************************************
I N S T A L L
**********************************************************************
AREAL MD-2085 USER'S GUIDE REVISION 1.0 MAY 1, 1991
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"
(3.81mm).
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 or |
| | Equivalent |
+--------------------+------------+
| Flex Cable Straight| 86456-044 |
+--------------------+------------+
| PCBA Straight | 86455-044 |
+--------------------+------------+
| PCBA Right Angle | 88333-044 |
+--------------------+------------+
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
-------------------------------------
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.
Electrical Description - XT 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. 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 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 | -Host Active/Slave| 40 | Gnd |
| 41 | +5 Volt Logic | 42 | +5 Volt Motor |
| 43 | Gnd | 44 | +AT -XT |
+------+-------------------+------+----------------+
Cabling
-------
All 2.5 inch AT/IDE interface drives use a 44 pin male connector that
incorporates power, control, and data signals. This configurations
differs from the 3.5 inch IDE drives which employ a 40 pin signal
connector and separate 4 pin power connector. Therefore, if you are
replacing an existing 3.5 inch drive and are faced with a 40 pin
connector, you will need an adapter card.
If your system did not previously have an IDE interface, you will
need to add a standard adapter card, such as the one shown below.
Since power and ground are present at the interface connector, damage
could be induced by offset or upside down connection. Please ensure
that pin 20 of your system's female connector is properly keyed.
Adapter Board
-------------
GND +5VDC
+----+-++
|O O O O|
++ +-----+-+
|+- Pin 44 | ++
|+----------------+ +------++ Pin 40
|+-------------------++-----++
|+--------------------++----++
|+---------------------++---++
|+----------------------+
||
|| ||
|+-----------------------+
++Pin 1 +--++ Pin 1
++
Functional Description
----------------------
The MD-2085 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 two 3370
type thin film heads.
**********************************************************************
F E A T U R E S
**********************************************************************
AREAL MD-2085 USER'S GUIDE REVISION 1.0 MAY 1, 1991
Introduction
------------
The Areal Model MD-2085 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-2085 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
------------
- AT or XT Modes of Operation
- 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-2085 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.
FOR ADDITIONALLY INFORMATIONS SEE ALSO MD-2065 DESCRIPTION !