Micropolis 1302
Hard Disk Drive
Overview
| Model | Capacity | Size | Height | Interface | Bus Type |
|---|---|---|---|---|---|
| Micropolis 1302 | 20MB | 5.25" | FHT | ST412 | MFM |
Specifications
| Size | 5-1/4" |
| Interface | ST-506/412 |
| Interface Type | |
| Encoding Method | MFM |
| Formatted Capacity | 20.4 MB |
| Disks | 2 |
| Heads | 3 |
| Cylinders | 830 |
| Sectors | 17 |
| Buffer Size | N/A |
| Average Seek | 30 msec |
| Single Track | 6 msec |
| Rotation Speed/Avg. Latency | 3600 rpm +/- 0.5% |
| Transfer Rate to / from media | 5 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 | 3.9A (max) | ||
| Read / Write | 2.0A avg | 0.9A avg | |
| Typical | 29 Watts |
Notes
Drive Addressing and Interface Termination
DS1, DS2, DS3, DS4 Drive Select Jumpers The Drive Select jumper locations are identified as DS1, DS2, DS3, and DS4. Only one Drive Select jumper is installed on a drive. The drives are shipped with the jumper installed at DS1. For every drive in a PC/AT installation, move the jumper from DS1 to DS2 (the special twisted interface cable that is generally used takes care of assigning a unique address to each drive). Some other systems may require that each drive be jumpered to a unique address (i.e., different DS numbers). RN1 Interface Terminator The Interface Terminator factory installed at RN1 provides proper termination for the interface lines. When daisy-chaining multiple 1300 drives, leave the terminator 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 terminator. W1 Write Fault Latch W1 is the Write Fault Latch. If W1 is present and the drive encounters a write fault, all writing to the drive is inhibited until after the drive has been de-selected. If W1 is absent, fault conditions are not latched. Drives are shipped with a jumper installed at W1; remove it for PC/AT installations. W2 is always installed. W7 is never installed. W8 is always installed. |