RP02 disk drive

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RP02 drive
Manufacturer: Memorex (basic drive), Digital Equipment Corporation (electronics)
Drive Controller(s): RP10 (PDP-10)
Capacity: 23.3 Mbytes (formatted), 29 Mbytes (raw)
Transfer Rate: 7.4 usec/18-bit word
Average Access Time: 62.5 msec
Revolutions per Minute: 2400
1/2 Revolution Time: 12.5 msec
One Track Seek Time: 20 msec
Average Seek Time: 50 msec
Maximum Seek Time: 80 msec
Total Surfaces: 20 (11 platters)
Tracks per Surface: 203 (nominally 200 plus 3 spares)
Sectors per Track: 10
Words per Sector: 256 18-bit
Density: 2230 bpi (maximum)
Recording Method: double frequency, NRZ
Physical Size: 30" W x 39" H x 24" L
Weight: 295 pounds
Power Consumption: 1250 VA (running); 5200 VA (starting)

The RP02 was the predecessor to the later RP03 multi-platter large disk drive.

The actual drive was produced by Memorex - a model 660-2a - and OEM'd by DEC, who added interface electronics.

A maximum of 8 drives were supported per controller.


a - There is some disagreement among sources; some claim it was a 660-1. There was apparently also a 660-0, which was a different version, rented out by Memorex; many were converted to 660-1's and sold to DEC.

See also

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