List of Floppy Disk Formats - Known Disk Logical Formats

Known Disk Logical Formats

Throughout the 1970s and 1980s, many different logical disk formats were used, depending on the hardware platform.

Common floppy disk formats, logical characteristics by platform
Platform Size Density Bytes/ sector Sectors/ track Tracks/ side Sides Capacity RPM Encoding Note
IBM (3740 format) 8 in single 128 26 74 1 250.25 KB 360 FM
Acorn 5¼ in single 256 10 40 1 100 KB 300 FM
80 200 KB
double 256 16 40 1 160 KB MFM
80 320 KB
2 640 KB
3½ in (90 mm) double 256 16 80 2 640 KB 300 MFM
1024 5 800 KB
high 10 1600 KB
Apple II 5¼ in double 256 13 35 1 113.75 KB 300 GCR
2 227.50 KB
16 1 140 KB
2 280 KB
3½ in (90 mm) double 512 Variable (8-12) 80 1 400 KB CLV GCR
2 800 KB
high 512 18 80 2 1440 KB 300 MFM
Apple Macintosh 3½ in (90 mm) double 512 Variable (8-12) 80 1 400 KB CLV GCR
2 800 KB
high 512 18 80 2 1440 KB 300 MFM
Atari 8-bit 5¼ in single 128 18 40 1 90 KB 288 FM
enhanced 128 26 127 KB MFM
double 256 18 180 KB
Commodore (8-bit) 5¼ in double 256 Variable (17-21) ZCAV 35 1 170 KB 300 GCR
2 340 KB
quad Variable (23-29) ZCAV 77 1 521 KB
2 1042 KB
3½ in (90 mm) double 512 10 80 2 800 KB MFM
Commodore Amiga 3½ in (90 mm) double 512 11 80 2 880 KB 300 MFM
high 22 1760 KB 150
IBM PC compatibles 8 in single 128 26 77 1 250.25 KB 360 MFM
2 500.5 KB
double 1024 8 1 616 KB
2 1232 KB
5¼ in double 512 8 40 1 160 KB 300 MFM
2 320 KB
9 1 180 KB
2 360 KB
unknown 8 80 1 320 KB unknown
2 640 KB
high 15 80 2 1200 KB 360
3½ in (90 mm) double 512 8 80 1 320 KB 300 MFM
2 640 KB
9 720 KB
high 18 80 1440 KB
21 80 1680 KB DMF
82 1720 KB
extended 36 80 2880 KB
NEC PC98 8 in single 128 26 77 1 250.25 KB 360 FM
double 1024 8 77 2 1232 KB MFM
5¼ in double 512 8 80 2 640 KB 360 MFM
9 720 KB
high 15 1200 KiB
1024 8 77 (80) 1232 (1280) KB
3½ in (90 mm) double 512 8 80 2 640 KB 360 MFM
9 720 KB
high 15 1200 KB 3mode
1024 8 77 (80) 1232 (1280) KB
512 18 80 1440 KB 300
SHARP X68000 5¼ in high 1024 8 77 2 1232 KB 360 MFM
3½ in (90 mm)

Read more about this topic:  List Of Floppy Disk Formats

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