DOS Fn 440dH CL=68H: IOCTL Sense Media Type

                                                         Compatibility: 5.0+ 
 Expects: AX    440dH
          BX    drive (0=default, 1=A, 2=B, etc.)
          CL    68H
          CH    08H (device category: block device)
          DS:DX addr of a 16-bit word to receive the current media type
 Returns: AX    error code  if CF is set to CY
          DS:DX buffer contains two 8-bit values identifying the media type
                in the specified drive
                DS:[DX+0]  01H=it is the default media type
                           00H=it is NOT the default media type
                DS:[DX+1]  02H=720K media is in the drive
                           07H=1.44 MB media
                           09H=2.88 MB media
    Info: Obtains information on what type of media is currently in the
          specified drive.

          This function is not supported by all device drivers for all
          media types.

See Also: Fn 44H (IOCTL)
          Fn 440dH (generic IOCTL for block devices)
          Fn 440dH 66H (query media ID)
          Generic IOCTL Data Packets
          DOS Functions