MFM "ST506/412 interface" (on RQDX{1,2,3}) ========================================== disk cap. sec/trk trk/cyl cyl notes === 5.25" FH RD50 5M 17 4 153 Seagate ST506 seek 85/3?/?? RD51 10M 17 4 306 Seagate ST412 seek 85/16.6?/?? RD52 31M 18 7 480 Quantum 540 / ATASI 3046 (also Evotek?) RD53 71M 18 8 1024? Microp 1325 (or 1335) w/ jumper at J7 RD54 156M 17 15 1225 Maxtor XT-2190D === 5.25" HH RD31 20M 17 4 615 ST225 seek (ms) 65/20/150 RD32 40M 17 6 820 ST251(-1*) seek 40(28*)/8/70 ST277R(-1*) [MFM format] 40(28*)/8/70 RD33 71M Microscience HH-1090 [Never released]