RP03 disk drive

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RP03 drive
Manufacturer: Sperry Univac ISS (basic drive), Digital Equipment Corporation (electronics)
Drive Controller(s): RP10 (PDP-10)
Capacity: 41 Mbytes
Transfer Rate: 7.5 μsec/word
Average Access Time: 41.5 msec
Revolutions per Minute: 2400
1/2 Revolution Time: 12.5 msec
One Track Seek Time: 7.5 msec
Average Seek Time: 29 msec
Maximum Seek Time: 55 msec
Total Surfaces: 20
Tracks per Surface: 406 (nominally 400 plus 6 spares; many systems used all 406, as reliability was high)
Sectors per Track: 10
Words per Sector: 256
Density: 2200 bpi (maximum)
Recording Method: double frequency, NRZ
Physical Size: 30" W x 40" H x 24" L
Weight: 315 pounds
Power Consumption: 660 VA per phase (running); 3300 VA per phase(starting)

The RP03 was the successor to the earlier RP02 multi-platter large disk drive, and the predecessor to the later RP04.

The actual drive was produced by the Information Storage Systems (ISS) division of Sperry Univac , a model 715, and OEM'd by DEC, who added interface electronics.

A maximum of 8 drives were supported per device controller.

See also

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