RP04 disk drive
From Computer History Wiki
| RP04 | |
| Manufacturer: | Sperry Univac ISS (basic drive), Digital Equipment Corporation (electronics) |
|---|---|
| Drive Controller(s): | RH10 (PDP-10) RH11 (UNIBUS) RH70 (PDP-11/70) |
| Capacity: | 88 Mbytes |
| Transfer Rate: | 2.5 usec/word |
| Average Access Time: | 36.3 msec |
| Revolutions per Minute: | 3600 |
| 1/2 Revolution Time: | 8.3 msec |
| One Track Seek Time: | 7 msec |
| Average Seek Time: | 28 msec |
| Maximum Seek Time: | 50 msec |
| Total Surfaces: | 19 |
| Tracks per Surface: | 411 |
| Sectors per Track: | 22 |
| Words per Sector: | 256 |
| Density: | 4040 bpi (maximum) |
| Recording Method: | Modified Frequency Modulation (MFM) |
| Physical Size: | 31" W x 40" H x 32" L |
| Weight: | 600 pounds |
| Power Consumption: | 660 VA per phase (running); 3300 VA per phase (starting, 10 seconds max) |
The RP04 was the successor to the RP03 multi-platter large disk drive, and the predecessor to the later RP05. It used a pack compatible with the IBM 3336 pack, used on the IBM 3330 drive.
The actual drive was produced by the Information Storage Systems (ISS) division of Sperry Univac (a model 733-10), and OEM'd by DEC, who added interface electronics.
It was the first large drive to use the MASSBUS bus; thus, it did not have a specific device controller, but used the appropriate MASSBUS controller. A maximum of 8 drives were supported per controller.
