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Format of FCB reserved field for DOS 1.10-1.25

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Offset Size Description

18h

BYTE

bit 7 : set if logical device
bit 6 : not dirty
bits 5 - 0 : disk number or logical device ID

19h

WORD

starting cluster number on disk

1Bh

WORD

current absolute cluster number on disk

1Dh

WORD

current relative cluster number within file

1Fh

BYTE

unused