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Format of DOS 2.x disk buffer

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Offset Size Description

00h

DWORD

pointer to next disk buffer, offset = FFFFh if last least-recently used buffer is first in chain

04h

BYTE

drive (0=A, 1=B, etc), FFh if not in use

05h

3 BYTEs

unused??? (seems always to be 00h 00h 01h)

08h

WORD

logical sector number

0Ah

BYTE

number of copies to write (1 for non-FAT sectors)

0Bh

BYTE

sector offset between copies if multiple copies to be written

0Ch

DWORD

pointer to DOS Drive Parameter Block (see #01395 at AH=32h)

10h

buffered data

See Also:

#01650,#01652,#01653,#01655