Format of parameter block for functions 46h, 66h:
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