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

Micropolis 4221AV Gold Series

Hard Disk Drive


Model Capacity Size Height Interface Bus Type
Micropolis 4221AV Gold Series 2050MB 3.5" SL Fast SCSI2

Size 3 1/2" 
Interface SCSI-2F
Encoding Method
Formatted Capacity 2,050 MB
Disks  5
Heads  9
Cylinders 4050
Sectors Variable
Buffer Size N/A
Average Seek 8.9. msec
Single Track
Rotation Speed/Avg. Latency 7200 rpm +/- 0.5%
Transfer Rate to / from. media 10 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 0.00 lbs.

Power Requirements

+12V +/-5% +5V +/-5% Power
Spin up .56A
Read / Write 1.53A .7A
Typical seeking 11.5 Watts



Configuration and Jumper Options

SCSI ID Selection  
Jumpers at ID0, ID1, and ID2 (or a pins 3/4, 5/6, and 7/8) select the SCSI address. 
Use either group for address selection but not both at the same time. 
Each SCSI device on one Host Adapter must have a unique address.

SCSI Jumpers
Address ID2 ID1 ID0
------- ----- ----- -----
0 (Default) 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
If terminators are installed at RN1 and RN2 (default), the drive provides termination for the SCSI interface. If the terminators are not installed, the drive does not provide interface termination. SCSI terminators are installed only in the end devices on the SCSI cable; remove the terminators from each of the other devices. The SCSI Host Adapter card and the last drive in the chain should have terminators.
Terminator Power
W1 and W2 select the source of power (+5V) for terminators RN1 and RN2; 
W3 controls the drive supplying +5V to the bus.

W1 W2 W3  
Y N - Drive provides terminator power. (Default)
N Y - Host provides terminator power via J1 pin 26 to RN1 and RN2
- - Y Drive supplies +5V to the bus via J1 pin 26. (Default)    
Spindle Options
Jumpers at SP0 (Pins 11 and 12) and SP1 (Pins 13 and 14) control the spindle options.
SP0  SP1  
N N The drive starts the spindle motor at power-on. (Default)
Y N The drive waits for a Start Unit SCSI command to start the spindle motor.
N Y Spindle start-up is delayed based on SCSI ID address (12 seconds per ID)
Write Protect
A jumper at WP (Pins 15 and 16) selects the write protect option.
Jumper The drive is write protected.
No Jumper The drive is not write protected. (Default)
A jumper at PTY (Pins 17 and 18) selects the bus parity check option. 
The drive always generates parity regardless of this option.
Jumper SCSI interface parity checking disabled.
No Jumper SCSI interface parity checking on. (Default)
Spindle Sync Signals
SSYNC (pin 23) is the spindle sync output signal pin when the drive is mode selected to be the master drive. Pin 23 is the spindle sync input when the drive is mode selected to slave mode. MSYNC (pin 21) is the spindle sync output when the drive is mode selected to master control mode. The odd-numbered pins opposite SSYNC and MSYNC are ground return lines for the corresponding signals.

Remote LED
A user-supplied LED may be connected to Remote LED (pins 1 and 2).