RP03 disk drive

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RP03
Manufacturer: Sperry Univac ISS (basic drive), Digital Equipment Corporation (electronics)
Drive Controller(s): RP10 (PDP-10)
RP11 (UNIBUS)
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.