RP03 disk drive

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RP03
Manufacturer: Sperry Univac ISS (basic drive), Digital Equipment Corporation (electronics)
Drive Controller(s): RP11 (UNIBUS)
Capacity: 41 Mbytes
Transfer Rate: 7.5 usec/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.

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

A maximum of 8 drives were supported per controller.