A - 1 2 0 X T ( 1 9 9 2 ) AREAL
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 2.5"/SUPERSLIMLINE Cylinders 1070| 535| |
Capacity form/unform 136/ MB Heads 4| 10| |
Seek time / track 15.0/ 3.0 ms Sector/track | 50| |
Controller IDE / XT Precompensation
Cache/Buffer 32 KB Landing Zone
Data transfer rate 1.875 MB/S int Bytes/Sector 512
5.630 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 0.2 W Altitude km -0.061 3.048| -0.061 12.192
idle 1.3 W Shock g 10 | 100
seek 1.6 W Rotation RPM 2981
read/write 1.6 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 A-120/180 TECHNICAL MANUAL REV. 2.0, JULY 1, 1992
+---------------------------------------------------------+
| NOT JUMPERS** |
| ** |XX44
| |XX
| |XX I
| *** |XX N
| *** |XX T
| 123 |XX E
| |X* R
| |XX F
| |XX A
| |XX C
| |XX E
| |XX
| | 2
| |xx50
+---------------------------------------------------------+
**********************************************************************
J U M P E R S
**********************************************************************
AREAL A-120/180 TECHNICAL MANUAL REV. 2.0, JULY 1, 1992
Jumper Setting
==============
User Options
------------
There are three user configurable, jumper options located on the
PCBA.
+----------+-------+
| IN | OUT |
+--+-------+-------+
|1 |MASTER*|SLAVE |
+--+-------+-------+
|2 |PDIAG |PDIAG* |
+--+-------+-------+
|3 |SPARE |SPARE* |
+--+-------+-------+
* Denotes Factory Setting
+--------------+-----+ +--------------+-----+
|Configuration |JMP1 | |Configuration |JMP2 |
+--------------+-----+ +--------------+-----+
|Master Drive |IN | |CAM PDIAG |IN |
+--------------+-----+ +--------------+-----+
|Slave Drive |OUT | |Non CAM PDIAG |OUT |
+--------------+-----+ +--------------+-----+
NOTE
The Common Access Method (SAM) specification calls for PDIAG to be
negated by the slave drive within 400 msec of the trailing edge of
RESET. Most of the disk vendors, however, use the opposite polarity.
**********************************************************************
I N S T A L L
**********************************************************************
AREAL A-120/180 TECHNICAL MANUAL REV. 2.0, JULY 1, 1992
Notes on Installation
=====================
Recommended 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
required. Maximum insertion length of the 3 mm x .5 screws is 0.15"
(3.8 mm).
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.
Two drives may be daisy chained on a single cable, but the maximum
total allowable cable length remains 18 inches.
Recommended mating connectors are as follows:
+-------------------+---------+-------------------+
|Connector Style |Dupont | Elco |
+-------------------+---------+-------------------+
|Flex Cable |86456-044|N/A |
+-------------------+---------+-------------------+
|Ribbon Cable |N/A |20-8394-2044-04-101|
+-------------------+---------+-------------------+
|PCBA Straight |86455-044|20-8390-2044-00-101|
+-------------------+---------+-------------------+
|PCBA Rigth 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 5.0 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 | Not Connected | 22 | Gnd |
+------+-------------------+------+----------------+
| 23 | -Host IOW | 24 | Gnd |
+------+-------------------+------+----------------+
| 25 | -Host IOR | 26 | Gnd |
+------+-------------------+------+----------------+
| 27 | -IOCHRDY | 28 | Not Connected |
+------+-------------------+------+----------------+
| 29 | Not Used | 30 | Gnd |
+------+-------------------+------+----------------+
| 31 | +Host IRQ | 32 | -Host IO16 |
+------+-------------------+------+----------------+
| 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 Interface |
+------+-------------------+------+----------------+
Air Filtration System
---------------------
Recirculated air is forced through a .3 micron filter, providing
a clean environment for the recording heads and disks.
**********************************************************************
F E A T U R E S
**********************************************************************
AREAL A-120/180 TECHNICAL MANUAL REV. 2.0, JULY 1, 1992
Introduction
------------
The Areal Models A120 and A180 are 2.5 inch, high capacity,
ruggedized, high performance, low power, low profile disk drives. By
design, they are ideal for notebook, laptop, or portable
applications.
Both units incorporate 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 of 32 KB
- Embedded Servo System
- Extremely Low Power Requirement (5 Volt only)
- Internal Air Filtration System
- Master/Slave Compatibility
- Programmable Low Power Modes
- Universal Translation
- 100 G Non-Operation Shock Tolerance
Error Correction
----------------
The A120/180 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.
Seek Time
---------
+----------------------------------+--------+
| | 120/180|
+----------------------------------+--------+
|Track-to-Track msec. typ. | 3 |
+----------------------------------+--------+
|Average msec. typ. | 15 |
| msec. max. | 24 |
+----------------------------------+--------+
|Latency msec. avg. | 10.1 |
+----------------------------------+--------+
Drive Mechanism
---------------
A brushless DC motor rotates the spindle at 2981 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 two 65 mm diameter glass disks using longitudinal
recording thin film heads.
Head Positioner Mechanism
-------------------------
Four read/write heads are positioned using a rotary voice coil
actuator.
Read/Write and Control Electronics
----------------------------------
Internally, a single IC is mounted in close proximity to the heads to
control head selection, read preamplification, and the write data
circuitry. The read/write heads are mounted to a voice coil actuator.
The microprocessor controlled circuit board provides the remaining
electronic functions which include:
- Spindle Motor Control - Interface Control
- Power Management - Read/Write Circuitry
- Rotary Actuator Control - Spin Speed Control
The microprocessor performs an extensive battery of tests when power
is applied and will not come READY if an error is detected.
Error Reporting
---------------
When the drive receives a command from the Host, it checks for
validity of the command, and with the exception of the Initialize
Drive Parameters command, also checks register values for valid
range. If the values are invalid, the drive does not execute the
command, but instead posts the "ERR" bit in the Status register and
the "ABRT" bit in the Error register.
If a data error occurs during command execution, the command is
terminated immediately.