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        Set access flag status

        Entry:
          AX = 440Dh
          BX = Drive
          CH = Category (Type of device)
                 8: Block device
          CL = 60h (Function within category)
                 (functions 43h-46h and 63h-66h are reserved for the
                 system).
          DS:DX = Address of packet
        Return:
          CF = 1
               AX = Error code
          CF = 0
               No error