Micropolis 1654-6

Hard Disk Drive

Overview

Model	Capacity	Size	Height	Interface	Bus Type
Micropolis 1654-6	138MB	5.25"	HHT		ESDI

Specifications

Size	5-1/4"
Interface	ESDI
Encoding Method
Formatted Capacity	138.0 MB
Disks	4
Heads	6
Cylinders	1249
Sectors	36
Buffer Size	N/A
Average Seek	16 msec
Single Track	4 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 1.625"H
Weight	5.75 lbs.

Power Requirements

	+12V +/-5%	+5V +/-5%	Power
Spin up	2.0A (max)
Read / Write	.9A avg	.7A avg
Typical			14 Watts

Notes

Notes:

Drive Addressing and Interface Termination

RN1 Interface Terminator
The Interface Terminator factory installed at RN1 will provide
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; 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.

DA1, DA2, DA3 Drive Address 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.

Drive	Select Jumpers
Address	DA3	DA2	DA1
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). Drives are factory configured as Drive Address 1.
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 only
Drive Address 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 controller can typically support a maximum of two drives.

W5 Selects the Spindle Control Option.
W5 selects the spindle a 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 applications.

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 in 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