QumeTrak 842

Specifications

Single Density Double Density
Capacity Unformatted 0.8 MiB 1.6 MiB
Capacity Formatted 0.6 MiB 1.2 MiB
Heads 2 2
Tracks 77 77
Track density 48 tpi 48 tpi
Record method FM MFM
Rotational Speed 360 rpm 360 rpm
Latency 83 ms 83 ms
Average Assess Time 91 ms 91 ms
Track to track 3 ms 3 ms
Settle time 15 ms 15 ms
Transfer Rate 250 Kib/s 500 Kib/s
Head Load Time 35 ms 35 ms
Motor Start Time 2 sec 2 sec

(Specifications from QumeTrak 842 Maintenance Manual - Dec 1981)