58 lines
2.8 KiB
Prolog
58 lines
2.8 KiB
Prolog
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Current MSDOS 1.xx - 2.xx Disk formats T. Jennings 19 Aug 83
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(8" formats updated 17 Aug)
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Disk Type Type Code
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Single Density Single Sided 8" (SD128)
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FIDO's 8" Double Density (DD1K)
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Double Density Double Sided 8" (DD1024-2)
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IBM Displaywriter System disk (SD256)
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IBM Displaywriter System disk (DD256-2)
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IBM PC 8 Sector Single Sided (IBM8)
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IBM PC 9 Sector Single Sided (IBM9)
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IBM PC 8 Sector Double Sided (IBM8-2)
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IBM PC 9 Sector Double Sided (IBM9-2)
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Single Density Double Sided 8" (SD128-2)
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Type Dir Disk Fats Blk Res Sec FAT
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Code Size Size size secs size ID
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SD128 68 251K 2 512 1 128 FE
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DD1K 192 660K 2 1024 1 1024 FE
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DD1024-2 192 1232K 2 1024 1 1024 FE
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SD256 80 287K 2 512 2 256 FA Note 1
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DD256-2 172 1001K 2 1024 2 256 FB Note 2
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IBM8 64 162K 2 512 1 512 FE
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IBM9 64 180K 2 512 1 512 FC
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IBM8-2 112 320K 2 1024 1 512 FF
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IBM9-2 112 360K 2 1024 1 512 FD
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SD128-2 68 2 512 4 128 FC
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Absolute sectors below are sector numbers relative to the
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start of the disk; sector 0 is track 0 sector 1 (the first sector).
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|-> Absolute Sectors
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Type trks secs res sec FAT dir 1st 2nd 1st 1st totl num.
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Code trk secs size size size FAT FAT dir data secs heads
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SD128 77 26 1 128 6 17 1 7 13 30 2002 1
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DD1024-2 77 8 1 1024 2 6 1 3 5 11 1232 2
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SD256 77 15 17 256 4 10 2 6 10 20 1155 1 Note 1
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DD256-2 77 26 54 256 6 20 2 8 14 34 4004 2 Note 2
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IBM8 40 8 1 512 1 4 1 2 3 7 320 1
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IBM9 40 9 1 512 2 4 1 3 5 9 360 1
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IBM8-2 40 8 1 512 1 7 1 3 5 10 640 2
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IBM9-2 40 9 1 512 2 7 1 3 5 12 720 2
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SD128-2 77 26 4 128 12 17 4 16 28 45 4004 2
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Note 1:
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15 sector bias in BIOS
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Note 2:
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52 sector bias in BIOS
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