Micropolis 1664-7

Hard Disk Drive

Overview

Model	Capacity	Size	Height	Interface	Bus Type
Micropolis 1664-7	344MB	5.25"	HHT		ESDI

Specifications

Size	5-1/4"
Interface	ESDI
Encoding Method	RLL
Formatted Capacity	344.4 MB
Disks	4
Heads	7
Cylinders	1780
Sectors	54
Buffer Size	N/A
Average Seek	14 msec
Single Track	4 msec
Rotation Speed / Avg. Latency	3600 rpm +/- 0.5%
Transfer Rate to / from media	15 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

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 Address	Select Jumpers
Drive 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 the 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 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 and Number Options
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	53	512	588
*out	out	in	54	512	576
out	in	out	28	1024	1116
out	in	in	14	2048	2232
in	out	out	7	4096	4464
in	out	in	----------- RESERVED -----------
in	in	out	97	256	321
in	in	in	1	31,248	31,248

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