Dec 112017
A description of Micropolis hard drives in text format and includes board layouts and jumper settings. It covers the older mfm drives as well as their current line of edsi drives.
File MICROPOL.ZIP from The Programmer’s Corner in
Category HD Utilities
A description of Micropolis hard drives in text format and includes board layouts and jumper settings. It covers the older mfm drives as well as their current line of edsi drives.
File Name File Size Zip Size Zip Type
1300SPEC.TXT 5045 1807 deflated
1320SPEC.TXT 5051 1829 deflated
1330SPEC.TXT 5040 1824 deflated
1350SPEC.TXT 6707 2204 deflated
1370SPEC.TXT 6226 1919 deflated
1550SPEC.TXT 7149 2174 deflated
1560SPEC.TXT 7196 2268 deflated
1570SPEC.TXT 8510 2322 deflated
1588SPEC.TXT 6948 2055 deflated
1650SPEC.TXT 7442 2246 deflated
1660SPEC.TXT 7444 2232 deflated
1670SPEC.BAK 6213 1890 deflated
1670SPEC.TXT 6082 1885 deflated
1680SPEC.TXT 6520 1919 deflated
ESDIPAK.TXT 5144 1669 deflated
MAC.TXT 4370 1337 deflated
PSPAK.TXT 7561 1706 deflated
SCSIPAK.TXT 5764 1793 deflated
TPCREAD.ME 199 165 deflated

Download File MICROPOL.ZIP Here

Contents of the 1300SPEC.TXT file


Model Number
Unformatted Capacity: 1302 1303 1304

Total Mbytes 25.9 43.3 85.3
Disk Platters 2 3 4
Read/Write Heads 3 5 6
Cylinders ------------------- 830 -----------------
Bytes per track ---------------- 10,416 -----------------

Formatted Capacity:

Total Mbytes 20.4 34.0 40.8
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

Performance Specifications

Seek Time (including settling time) Track-to-Track 6 msec
Average 30 msec
Maximum 60 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 20,000 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 830*
Reduced Write Current Start Cylinder 830*
Landing Zone 830
Type of Media Plated
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 |
| 1 2 1 2 3 4 |
| |
| |

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
1300 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

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.

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