RP06 disk drive

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RP06
Manufacturer: Memorex (basic drive), Digital Equipment Corporation (electronics)
Drive Controller(s): RH11 (UNIBUS)
Capacity: 176 Mbytes
Transfer Rate: 806 KB/s (peak)
Average Access Time: 38.3 msec
Revolutions Per Minute: 3600
1/2 Revolution Time: 8.3 msec
One Track Seek Time: 10 msec
Average Seek Time: 30 msec
Total Surfaces: 20 (19 data, 1 servo)
Tracks Per Surface: 815
Sectors Per Track: 22
Words Per Sector: 256
Tracks Per Inch: 384
Density: 4040 bpi (maximum)
Recording Method: Modified Frequency Modulation (MFM)
Physical Size: 33" W x 47" H x 32" L
Weight: 600 pounds
Power Consumption: 660 VA per phase (running); 3300 VA per phase (starting, 10 seconds max)


The RP06 was the successor to the RP04 multi-platter large disk drives. The actual drive was a Memorex 677-01, OEM'd by DEC, who added interface electonics.

As a MASSBUS device, it did not have a specific device controller, but used the appropriate MASSBUS controller. A maximum of 8 drives were supported per controller; drives could be dual-ported, to allow access from two different controllers.

The block headers are protected by a CRC, and the data by an ECC.