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        Set media type for format (AT model 3x9,XT2,XT286,PS)
        (harddisk only)

        Entry:
          AH = 18h
          DL = drive number
          CH = lower 8 bits of number of tracks
          CL = sectors per track (bits 0-5)
               top 2 bits of number of tracks (bits 6,7)

        Return:
          AH = 00h  requested combination supported
               01h  function not available
               0Ch  not supported or drive type unknown
               80h  there is no disk in the drive
          ES:DI = pointer to 11-byte parameter table