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)

  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)
          Device Drivers
          DOS Functions