RC25 disk drive
From Computer History Wiki
| RC25 | |
| Manufacturer: | DEC |
|---|---|
| Drive Controller(s): | KLESI Low-End Storage Interconnect |
| Capacity: | 26 Mbytes (fixed) 26 Mbytes (removeable) |
| Transfer Rate: | 1.25 Mbytes/sec |
| Average Access Time: | 30.5-45.5 msec |
| Revolutions per Minute: | 2850 |
| 1/2 Revolution Time: | 10.5 msec |
| Average Seek Time: | 20-35 msec |
| Maximum Seek Time: | 55 msec |
| Media: | 1 fixed 1 removeable |
| Total Surfaces: | 4 (2 fixed, 2 removeable) |
| Number of Heads: | 4 |
| Tracks per Surface: | 821 |
| Sectors per Track: | 31 |
| Bytes per Sector: | 512 |
| Tracks per Inch: | 1,000 |
| Density: | 12,350 bits/inch |
| Start Time: | 60 secs (max) |
| Stop Time: | 30 secs (max) |
| Physical Size: | 10.4" x 19.9" x 22.1" |
| Weight: | 65 lbs (single drive) |
| Power Consumption: | 300 watts (idle) |
The RC25 disk drive was a combination non-removable-media disk and removable-pack disk (using a sealed pack) on a singled spindle, from DEC. Each 8" platter had a capacity of 25 MB, for a total of 52 MB. It connected to the device controller via the DEC standard Low End System Interconnect bus; a second 'slave' drive can be connected to the first 'master' drive. It uses the Mass Storage Control Protocol, and is member of the Digital Storage Architecture.
External links
- rc25 - documentation at Bitsavers
- RC25 Disk Subsystem
- RC25 Disk Subsystem Pocket Service Guide (EK-0RC25-PS-002)
