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Format of DOS 1.1 and MS-DOS 1.25 drive parameter block

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Offset Size Description

00h

BYTE

sequential device ID

01h

BYTE

logical drive number (0=A:)

02h

WORD

bytes per sector

04h

BYTE

highest sector number within a cluster

05h

BYTE

shift count to convert clusters into sectors

06h

WORD

starting sector number of first FAT

08h

BYTE

number of copies of FAT

09h

WORD

number of directory entries

0Bh

WORD

number of first data sector

0Dh

WORD

highest cluster number (number of data clusters + 1)

0Fh

BYTE

sectors per FAT

10h

WORD

starting sector of directory

12h

WORD

address of allocation table

Note:

The DOS 1.0 table is the same except that the first and last fields are missing; see INT 21/AH=32h for the DOS 2+ version.

See Also:

#01395,#04039