This structure is used to uniquely identify the medium in a drive.  It is
used in the following IOCTL fns:
440dH 46H (set media ID)
440dH 66H (query media ID)

DvRq 13H  (generic IOCTL for block devices)

IoctlMediaIdRec
Offset Size Contents
                                                                          
+0     2  wInfoLevel   always 00
+2     4  lSerNo       32-bit volume serial number
+6    0bH abVolLabel   11-character text volume label, blank-padded
+11H    8  abFileSysID  contains 'FAT12   ' or 'FAT16   ')
19H (25)         size of an IoctlMediaIdRec

See Also: fn 440dH (Generic IOCTL for block devices)
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IoctlMediaIdRec