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Format of parameter block for functions 46h, 66h

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Offset Size Description

00h

WORD

(call) info level (should be 0000h)

02h

DWORD

disk serial number (binary)

06h

11 BYTEs

volume label or "NO NAME____"

11h

8 BYTEs

filesystem type "FAT12___" or "FAT16___" (generally CL=66h only, but MS-DOS 5.0 will write the given filesystem type to the disk)

Note:

Under MS-DOS 7.0 or a Windows95 DOS box, the volume label field can return as all blanks even when a volume label has been set (the Win95 installation seems to blank the volume label field in the partition boot sector; once LABEL has been run, the volume label is reported correctly).

See Also:

AH=69h