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Format of FCB reserved field for DOS 1.0

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Offset Size Description

16h

WORD

location in directory (if high byte = FFh, low byte is device ID)

18h

WORD

number of first cluster in file

1Ah

WORD

current absolute cluster number on disk

1Ch

WORD

current relative cluster number within file
0 - first cluster of file
1 - second cluster of file
etc.

1Eh

BYTE

dirty flag
00h = not dirty

1Fh

BYTE

unused

Note:

See Also: