RK02/03 disk drive
|Drive Controller(s):|| RK8E (Omnibus)|
|Capacity:|| 1.22 Mbytes (RK02)|
2.45 Mbytes (RK03)
|Transfer Rate:|| 22.2 μsec/word (RK02-RK11)|
11.1 μsec/word (RK03-RK11)
|Average Access Time:||70 msec|
|Revolutions Per Minute:||1500|
|1/2 Revolution Time:||20 msec|
|One Track Seek Time:||15 msec|
|Average Seek Time:||70 msec|
|Tracks Per Surface:||203 (nominally 200, plus 3 spares)|
|Sectors Per Track:|| 16 (RK8E)|
|Words Per Sector:|| 128 (RK02-RK11)|
|Tracks Per Inch:||100|
|Density:|| 1100 bpi (RK02)|
2200 bpi (RK03)
|Recording Method:||Double Frequency|
|Physical Size:||19" W x 10.5" H x 26.0" L|
|Weight:||43 pounds (basic Diablo drive)|
The original RK02 (Diablo Model 30) was soon joined by the RK03 (Diablo Model 31), a double-density model which held twice as much data.
The pack contained a platter 14 inches in diameter, coated with iron oxide. Since the disk was hard sectored, platters used in the PDP-8 were physically incompatible with those used in the PDP-11, although the drives themselves were completely identical for both.
They were replaced by the DEC-manufactured RK05, which used the same packs.