Set type (AT,XT2,XT286,CONV,PS)
        (harddisk only)

        Entry:
          AH = 17h
          AL = disk type
               00 = no disk
               01 = regular disk in regular drive
               02 = regular disk in high-capacity drive
               03 = high-capacity disk in high-capacity drive
          DL = drive ID

        Note:   I assume that 05h and 06h are 720K in 1.44M
                and 1.44M in 1.44M