Micropolis hard Disk Drives, Specifications, Support, Specs, Jumpers, Manual, Images

Micropolis 1353

Hard Disk Drive


Model Capacity Size Height Interface Bus Type
Micropolis 1353 75MB 5.25" FHT ESDI


Size 5-1/4"
Interface ESDI
Interface Type
Encoding Method
Formatted Capacity 75.4 MB
Disks 3
Cylinders 1024
Sectors 36
Buffer Size N/A
Average Seek 23 msec
Single Track 5 msec
Rotation Speed / Avg. Latency 3600 rpm +/- 0.5%
Transfer Rate to / from media 10 Mbits/sec
Transfer Rate to / from buffer N/A
Tracks Per Inch (TPI)
Bits Per Inch (BPI)
Dimensions 8.0"L x 5.75"W x 3.25"H
Weight 5.75 lbs.

Power Requirements

+12V +/-5% +5V +/-5% Power
Spin up 4.25A (max)
Read / Write 2.0A avg 2.A avg
Typical 32 Watts


Drive Addressing and Interface Termination

RN1 Interface Terminator
 The Interface Terminator factory installed at RN1 provides proper
 termination for the interface lines. When daisy-chaining multiple
 drives, leave the terminator installed only 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

DA1, DA2, DA3 Drive Select Jumpers
 The Drive Address jumpers are identified as DA1, DA2, and DA3.
 Address selection is binary, as shown in the table below. The
 ESDI controller's documentation will specify the drive address
 to use.

1 out out in
2 out in out
3 out in in
4 in out out
5 in out in
6 in in out
7 in in in

"Drive Address 0" (no jumper at DA1, DA2 or DA3) is a "deselect" 
 (i.e., no drive selected). For many multiple drive installations, 
 each drive must have a unique address. An exception is that for 
 every drive in a PC/AT installation, verify that the only Drive 
 Address jumper is at DA2; move the jumper if necessary (the 
 special twisted interface cable that is generally used takes care 
 of assigning a unique address to each drive). PC/AT controllers 
 can typically support a maximum of two drives.

W5 Select the Spindle Control Option
 W5 selects the spindle control option. If W5 is installed, the 
 drive waits for a Start Spindle command (after power is applied) 
 to start the spindle motor. If W5 is not installed (the factory 
 default configuration), the drive automatically starts the 
 spindle motor at power-on. W5 is not installed for PC/AT 

W1 Selects the Sectoring Mode.
 If W1 is installed, the drive operates in the soft-sectored mode. 
 If W1 is not installed (the factory default configuration), the 
 drive operates in the hard-sector mode. W1 is not installed for 
 most PC/AT applications.

W2, W3, W4 Sector Size Option
 The number of bytes per sector may be specified using the Set 
 Bytes Per Sector command or by selecting a default sector 
 configuration with jumpers W2, W3, and W4 as follows: 

Jumpers Sectors Bytes / Sector
W4 W3 W2 Per Track Formatted Unformatted
out out out 35 512 595
*out out in 36 512 578
out in out 19 1024 1096
out in in 9 2048 2314
in out out 5 4096 4166
in out in 32 512 651
in in out 64 256 325
in in in 1 20,832 20,832

 * This is the default (factory installed) configuration and is
recommended for PC/AT applications