I seriously recommend the following web page: http://www.blue-planet.com/tech/no-frames.html It's the best source of info that I know of for Hard Drives. I would also recommend the "POCKET PCRef" from Sequoia Publishing, ISBN 1-885071-13-2, it's about the size of a pocket Bible, and is the second best source that I'm aware of. Great thing to have in your pocket when you're hitting the swap meets or junk shops looking for a drive. Zane Key --- CAP = CAPACITY IN FORMATTED MEGABYTES CYC = MAXIMUM NUMBER OF CYLINDER H = NUMBER OF DATA HEADS RWC = START REDUCED WRITE CURRENT WPC = START WRITE PRECOMP ENC = ENCODING METHOD R=RLL, M=MFM RATE = TRANSFER RATE IN MEGABITS/SEC ACCESS = AVERAGE ACCESS TIME SPT = SECTORS/TRACK X 512 bytes FH = FULL HIGH FORM FACTOR HH = HALF HIGH FORM FACTOR R = RLL (run length limited) N = NRZ (non return to zero) M = MFM (modified frequency modulation) SA = STAND ALONE Z = ZBR ------------------------------------------------------------------------ MODEL ST-506 MFM CAP CYC H RWC WPC ENC RATE ACCESS SPT FK305-26 3.5" 21 615 4 - 616 M 5 50-80MS 17 FK305-39 3.5" 32 615 6 - 616 M 5 50-80MS 17 FK309-26 3.5" 21 615 4 - 616 M 5 50-80MS 17 FK301 10 306 4 307 128 M 5 17 FK302-13 10 612 2 613 307 M 5 17 FK302-26 21 612 4 613 307 M 5 17 FK302-39 32 612 6 613 307 M 5 17 FK303-52 3.5" 40 615 8 - 616 M 5 50-80MS 17 ST-506 RLL FK305-39R 3.5" 32 615 4 - 616 R 7.5 50-80MS 26 FK305-58R 3.5" 49 615 6 - 616 R 7.5 50-80MS 26 FK309-39R 32 615 4 - 616 R 7.5 26 SCSI FK308S-58R 3.5" 45 615 6 - - R 7.5 50-80MS FK308S-39R 3.5" 32 615 4 - 616 R 7.5 50-80MS FK309S-50R 3.5" 41 615 4 - - R 7.5 50-80MS | Zane H. Healy | UNIX Systems Adminstrator | | healyzh(a)ix.netcom.com (primary) | Linux Enthusiast | | healyzh(a)holonet.net (alternate) | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | and Zane's Computer Museum. | | http://www.dragonfire.net/~healyzh/ |