Floppy Diskette's ----------------------------------------------------------------------------- Storage Formatted | 160K 180K 320K 360K 720K 720K 400K 1M2 1M4 Disk Size | 5.25 5.25 5.25 5.25 5.25 3.50 5.25 5.25 3.50 Disk Type | 2 4 Media Discriptor | FE FC FF FD F9 FA F9 F0 Density | S D S D D S H H Sides | 1 1 2 2 2 2 1 2 2 Access Time Trk-Trk ms| 6 Hd Load+Settle Time ms| 30 Rotational Latency ms| 100 83 100 Random Access ms| 290 Ave Seek ms| 164 92 94 Motor Start ms| 500 Transfer Rate Kb| 250 500 500 Disk Rotation RPM| 300 Root Dir fil| 96 Number of FATs | 2 2 2 2 2 2 FAT Type (bit)| 12 12 12 12 12 12 Tracks | 40 40 40 40 80 80 80 80 Cylinders | 80 80 TPI | 96 Cluster Size | 512 512 1024 1024 1024 512 512 512 Number Clusters | 351 354 713 768 2371 2847 Sectors/Cluster | 1 2 2 1 1 1 Sectors/Track | 8 9 8 9 9 10 15 18 Bytes/Sector | 512 512 512 512 512 512 Bytes/Track | 5120 Disk Size | 5.25 5.25 5.25 5.25 5.25 3.50 5.25 5.25 3.50 Storage Formatted | 160K 180K 320K 360K 720K 720K 400K 1M2 1M4 ----------------------------------------------------------------------------- General Disk Information ------------------------ --Sector location ranges(DOS 3.xx)-- Disk Disk FAT-1 FAT-2 Root Data Area Size Type ------------------------------------ ------------------------------------------------------------------------- 160K 5 1/4"SS 0 1 2 3-6 7-319 180K 5 1/4"SD 0 1-2 3-4 5-8 9-359 320K 5 1/4"DS 0 1 2 3-9 10-639 360K 5 1/4"DD 0 1-2 3-4 5-11 12-719 720K 3 1/2"DD 0 1-3 4-6 7-13 14-1439 400K 5 1/4"DS 1M2 5 1/4"DQ 0 1-7 8-14 15-28 29-2399 1M4 3 1/2"DQ 0 1-9 10-18 19-32 33-2879 ------------------------------------------------------------------------- LOGICAL CHARACTERISTICS ======================= 360k 400k 720k 1m2 1m4 -------------------------------------------------- FAT start sctr: 20 1 1 Sectors Occup 6 14 18 Rt Dir strt sctr: 26 15 19 Sctrs Occup 6 14 14 Data strt sctr: 32 29 33 Sctrs Occup 769 2372 2848 -------------------------------------------------- DIGITAL FLOPPY EQUIVELENTS -------------------------- RX23 1.4M 3 1/2" RX33 1.2M 5 1/4" RX50 409K 5 1/4" COMPAQ FLOPPY CABLE ------------------- Diskette one has lines 10-16 reversed (7 leads) Diskette two & three are straight through Diskette Controller Connectors: ------------------------------- PC, XT Floppy Disk 34-pin keyed edge connector (key b/w 6 and 8), even numbers are on component side: -----------IBM DESCRIPTION----------------------STANDARD DESCRIPTION----- Pin Description Direction Pin Description ------------------------------------------------------------------------- 1 Ground 1 2 UNUSED 2 Spare 3 Ground 3 4 UNUSED 4 In use 5 Ground 5 6 UNUSED 6 Drive select 3 7 Ground 7 8 Index From drive 8 Index 9 Ground 9 10 Motor Enable A From controller 10 Drive select 0 11 Ground 11 12 Drive Select B From controller 12 Drive select 1 13 Ground 13 14 Drive Select A From controller 14 Drive select 2 15 Ground 15 16 Motor Enable B From controller 16 Motor on 17 Ground 17 18 Direction (stepper motor) F. C. 18 Direction Select 19 Ground 19 20 Step pulse From controller 20 Step 21 Ground 21 22 Write data From controller 22 Write data 23 Ground 23 24 Write enable From controller 24 Write gate 25 Ground 25 26 Track 0 From drive 26 Track 0 27 Ground 27 28 Write protect From drive 28 Write protect 29 Ground 29 30 Read data From drive 30 Read data 31 Ground 31 32 Select head 1 From controller 32 Side one select 33 Ground 33 34 UNUSED 34 Ready Floppy (4-pin molex connector): ------------------------------- Pin Function 1 +12V 2 Ground 3 Ground 4 +5V