CalComp Model 215 Disk Drive
From Computer History Wiki
| CalComp Model 215 | |
 CalComp Model 215 drive | |
| Manufacturer: | Century Data Systems |
|---|---|
| Drive Controller(s): | RP10 (PDP-10) |
| Capacity: | 58 Mbytes (per drive) |
| Transfer Rate: | 312 Kbytes/sec |
| Revolutions per Minute: | 2400 |
| 1/2 Revolution Time: | 12.5 msec |
| One Track Seek Time: | 10 msec |
| Average Seek Time: | 35 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) |
| Tracks per Inch: | 200 |
| Density: | 2200 bpi (maximum) |
| Physical Size: | 32" W x 35" L x 61" H |
| Weight: | 850 pounds (Model 215) 510 pounds (Model 213) |
| Power Consumption: | 20 A per drive (starting); 4.3A A per drive (running) |
The CalComp Model 215 Disk Drive was a popular OEM multi-platter large removable-pack disk drive from Century Data Systems (during the time when they were a subsidiary of California Computer Products; hence the name).
Technically, the 215 held two drives in one cabinet; the CalComp Model 213 Disk Drive was the name for a unit with only one drive.
External links
- CalComp Model 215 Disk Drive
- CalComp 1015A Dual Density Disk Storage System - includes 215 units
- ML PDP-10 - image of CalComp 215's on MIT-ML
