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Format of parameter block for function 6Fh

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Offset Size Description

00h

BYTE

(call) length of this buffer (in bytes)

01h

BYTE

(ret) number of bytes in parameter block actually used

02h

BYTE

(ret) drive flags (see #01571)

03h

BYTE

(ret) physical drive number
00h-7Fh - floppy
80h-FEh - hard
FFh - no physical drive

04h

DWORD

(ret) bitmap of logical drives associated with physical drive:
bit 0 : drive A:
bit 1 : drive B:
bit 2 : drive C:
bit 3 : drive D:
bit 4 : drive E:
bit 5 : drive F:
bit 6 : drive G:
bit 7 : drive H:
bit 8 : drive I:
bit 9 : drive J:
bit 10 : drive K:
bit 11 : drive L:
bit 12 : drive M:
bit 13 : drive N:
bit 14 : drive O:
bit 15 : drive P:
bit 16 : drive Q:
bit 17 : drive R:
bit 18 : drive S:
bit 19 : drive T:
bit 20 : drive U:
bit 21 : drive V:
bit 22 : drive W:
bit 23 : drive X:
bit 24 : drive Y:
bit 25 : drive Z:

08h

QWORD

(ret) relative block address of partition start