MICROPOLIS 2112A DISK DRIVE
SPECIFICATIONS
Model Number
Unformatted Capacity: 2112A-15
Total Mbytes -------------- 1220 -----------------
Disk Platters ----------------- 8 -----------------
Read/Write Heads ----------------- 15 -----------------
Cylinders --------------- 1760 -----------------
Bytes per track ----------- VARIABLE -----------------
Formatted Capacity
Total Mbytes --------------- 1050 -----------------
Bytes per Sector ---------------- 512 -----------------
Sectors per Track ----------- VARIABLE -----------------
Performance Specifications
Seek Time Adjacent Track 1.5 msec
(including settling time) Average 10.0 msec
Maximum 25 msec
Average Rotational Latency 5.56 msec
Rotational Speed 5400 rpm +/- 0.5%
Data Transfer Rate at Interface Up to 5.6 Mbytes/sec
Internal Data Rate 24 to 40 MHz
MTBF 300,000 hours
Positioner Fully balanced rotary voice coil
Parking Automatic park and lock
General Functional Specifications
Interface AT/IDE
Supports Full Common Command Set YES
Mounting Plane Any orientation
Power Requirements
+12V +/-5% 0.75A Avg
(2.0 max during start-up)
+5V +/-5% 1.0A avg
Power dissipation, typical 11.5 Watts
7. Drive Options
____ _______________________ ________
| J2 | | J1 | | J3 |
| |_|_______________________|_|________|
| |
| RESERVED |
| | | | |
| : : : : : |
| | | |
| W1 | |
| W2 |
| |
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
| LED |
|________||_______________________________|
W1, W2 Jumpers (Master / Slave Selection)
The interface allows up to two drives (a Master and one Slave) to be
attached to the AT/IDE bus. The following table shows the configurations.
W1 W2 Description
+------+------+-------------------------------------------------------+
| IN | IN | Drive emulates *both* Master and Slave (DEFAULT) |
+------+------+-------------------------------------------------------+
| OUT | IN | Drive is Master, Slave is present |
+------+------+-------------------------------------------------------+
| IN | OUT | Drive Slave |
+------+------+-------------------------------------------------------+
| OUT | OUT | Drive is Master |
+------+------+-------------------------------------------------------+
DRIVE EMULATES BOTH MASTER AND SLAVE
Specifies that one 2112A drive can emulate both the Master drive (Drive 0)
and the Slave drive (Drive 1). This option allows for existing host systems
to utilize the full capacity of the drive.
When the drive is configured as both the Master and the Slave, the Master's
(Drive 0) capacity is set to:
1024 logical cylinders,
16 logical heads, and
63 logical sectors.
This setting yields 528,482,304 bytes.
The Slave's (Drive 1) capacity is set to the remaining storage on the
disk drive.
For this configuration, the recommended drive type setting in your
computer's CMOS memory is as follows:
Drive 0 Drive 1
Logical Cylinders: 1024 1010
Logical Heads: 16 16
Logical Sectors: 63 63
NOTE: The capacity of the 2112A drive may exceed the capacity that the
host can access. This limitation stems from the communication link between
the DOS and the BIOS. A typical limit is:
1024 cylinders
16 heads
63 sectors
For optimum use of the following options, the BIOS may need to be modified.
DRIVE IS MASTER, SLAVE IS PRESENT
Specifies the Master drive (Drive 0) when two 2112A drives are used in the
system. The other drive is the Slave.
DRIVE IS SLAVE
Specifies the Slave drive (Drive 1) when two 2112A drives are used in the
system. The other drive is the Master.
DRIVE IS MASTER
Specifies the Master drive (DRIVE 0) when one 2112A drive is used in a
system.
