Data Sheet (Technical Specifications from the manual (v7.1)) Formatted capacity 20MB Bytes per sector 512 Sector per track 17 Tracks per cylinder 4 Number of cylinders 620 Media size 5,25" Recording density 10,200 Bits/inch Track density 300 Tracks/inch Transfer rate to C64 memory 38,000 Bytes/sec Transfer rate to 128 memory 65,000 Bytes/sec Rotational speed 3,600 rpm Average latency time 8,3 ms Positioning time 18 ms min. 192 ms max. Power consumption 20MB SCSI Drive 117 Volt A.C. 60 Hz. 30W typical. 40W max.That's all I know, mail me if you know more!