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1320SPEC.TXT
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1989-09-14
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MICROPOLIS 1320 SERIES DISK DRIVE
SPECIFICATIONS
Model Number
Unformatted Capacity: 1323 1323A 1324 1324A 1325
Total Mbytes 42.7 53.3 64.0 74.7 85.3
Disk Platters 3 3 4 4 5
Read/Write Heads 4 5 6 7 8
Cylinders ------------------ 1024 -----------------
Bytes per track ---------------- 10,416 -----------------
Formatted Capacity:
Total Mbytes 35.6 44.5 53.4 62.3 71.3
Bytes per Sector ------------------- 512 -----------------
Sectors per Track -------------------- 17 -----------------
PC Drive Types
Examine the entries in your drive table and find the type that
most resembles the head and cylinder parameters of the drive
without exceeding these parameters. If you are using third-party
installation/partitioning software, follow the instructions
included with the software as it may perform this step
automatically.
Performance Specifications
Seek Time (including settling time) Track-to-Track 6 msec
Average 28 msec
Maximum 62 msec
Average Rotational Latency 8.33 msec
Rotational Speed 3600 rpm +/- 0.5%
Data Transfer Rate 5 Mbits/sec
Optimum Step Rate 20 usec or faster (buffered seek)
MTBF 35,000 hours
Positioner Fully balanced rotary voice coil
Parking Automatic park and lock
General Functional Specifications
Interface ST-506/412
Encoding Method MFM (Modified Frequency Modulation)
(Although these drives may be capable of functioning in
an RLL environment, Micropolis does not certify or
warrant them for this application.)
Sectoring Soft
Write Precompensation Start Cylinder 1024*
Reduced Write Current Start Cylinder 1024*
Landing Zone 1024
Type of Media Oxide
Mounting Plane Any orientation
* These are effectively turned off by specifying a non-existent
cylinder. Some systems accomplish this by using a value of "-1"
Power Requirements
+12V +/-5% 2.0A avg
(3.9A max during start-up)
+5V +/-5% 0.9A avg
Power dissipation, typical 29 Watts
Drive Addressing and Interface Termination
J1 J2
____ __________________ ____________ ________
| | |1| | |1| | | W W |
| |_| |___| |_| 7 8 |
| D D D D |
| TERMINATOR W W S S S S |
| 1 2 1 2 3 4 |
| |
| |
| (COMPONENT SIDE) |
DS1, DS2, DS3, DS4 Drive Select Jumpers
The Drive Select jumper locations are identified as DS1, DS2,
DS3, and DS4. Only one Drive Select jumper is installed on a
drive. The drives are shipped with the jumper installed at DS1.
For every drive in a PC/AT installation, move the jumper from DS1
to DS2 (the special twisted interface cable that is generally
used takes care of assigning a unique address to each drive).
Some other systems may require that each drive be jumpered to a
unique address (i.e., different DS numbers).
RN1 Interface Terminator
The Interface Terminator factory installed at RN1 provides proper
termination for the interface lines. When daisy-chaining multiple
1320 drives, leave the terminator in the last physical drive on
the daisy chain cable; remove the terminator from each of the
other drives. In most PC/AT installations, the C: drive is
actually at the end of the cable and should retain the
terminator.
W1 Write Fault Latch
W1 is the Write Fault Latch. If W1 is present and the drive
encounters a write fault, all writing to the drive is inhibited
until after the drive has been de-selected. If W1 is absent,
fault conditions are not latched. Drives are shipped with a
jumper installed at W1; remove it for PC/AT installations.
W2 is always installed.
W7 is never installed.
W8 is always installed.