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

Micropolis 4743NS

Hard Disk Drive


Model Capacity Size Height Interface Bus Type
Micropolis 4743NS 4300MB 3.5" SL Ultra SCSI3

This drive is from the 4743 "Stinger" model family.


Size 3 1/2" 
Interface EIDE
Interface Type 40 Pin
Encoding Method
Formatted Capacity 2.5 GB
Disks  2
Heads  4
Cylinders 4050
Sectors 512
Buffer Size N/A
Average Seek 10.5 msec
Single Track
Rotation Speed/Avg. Latency 5200 rpm +/- 0.5%
Transfer Rate to / from. media 20 Mbytes/sec  Synchronous
Transfer Rate to / from buffer
Tracks Per Inch (TPI)
Bits Per Inch (BPI)
Dimensions 5.75"D x 4.0"W x 1.0"H
Weight 1.4 lbs.

Power Requirements

+12V +/-5% +5V +/-5% Power
Spin up .55A
Read / Write .6A .6A
Typical seeking 12 Watts


Configuration and Jumper Options

Front View

SCSI ID Jumpers at Pin 3-4, 5-6, and 7-8 select the SCSI ID. 
Each SCSI device on one Host Adapter must have a unique SCSI ID (0-7). 
SCSI ID0 is the Default.

0 out out out
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

Interface Termination  (W4)
Jumper installed at W4 (Default) - The drive provides termination for the interface lines; onboard termination is electrically enabled. Jumper omitted at W4 - The drive does not provide termination for the interface lines; onboard termination is electrically disabled.

Terminator Power (W1, W2, W3)
Jumper installed at W1 (Default) - The drive provides terminator power.
Jumper installed at W2 - The host provides terminator power (via Interface Connector J1A).
Jumper installed at W3 (Default) - The drive provides terminator power (via J1A) to the SCSI Bus. 

Spindle Control (SP0)
Jumper installed at SP0, jumper omitted at SP1 - The spindle motor starts when SCSI 'START UNIT' command is received. Jumpers omitted at SP0 (Default) and at SP1 - The spindle motor starts at power-on.

Spindle Delay (SP1)
Jumper installed at SP1, jumper omitted at SP0 Spindle motor start-up is delayed, based on SCSI ID (12 seconds per SCSI ID). Jumpers omitted at SP1 (Default) and at SP0 - The spindle motor starts at power-on.

Write Protect (WP)
Jumper installed at WP - The drive is write protected. Jumper omitted at WP (Default) - The drive is not write protected.

BUS Parity Check (PTY)
Jumper installed at PTY - The drive neither generates nor detects parity. Jumper omitted at PTY (Default) - The drive generates parity and has parity detection enabled. 

Remote LED
Open-collector output - Used to drive a user-supplied LED to indicate the drive is active.