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Format of DOS 3.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

BYTE

buffer flags (see #01651)

06h

WORD

logical sector number

08h

BYTE

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

09h

BYTE

sector offset between copies if multiple copies to be written

0Ah

DWORD

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

0Eh

WORD

unused??? (almost always 0)

10h

buffered data

See Also:

#01649,#01652,#01653,#01655