Shugart SA850/851

Specifications

Single Density Double Density
Capacity Unformatted 0.8 MiB 1.6 MiB
Capacity Formatted (IBM Format, 128-byte sectors) 0.5 MiB 1.0 MiB
Heads 2 2
Tracks 77 77
Track density 48 tpi 48 tpi
Record method FM MFM/M2FM
Rotational Speed 360 rpm 360 rpm
Latency (avg.) 83 ms 83 ms
Average Access 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 50 ms 50 ms

(Specifications from OEM Manual - November 1980)