o  robot_name - The name of the robot device to be opened. On
       Digital UNIX, if the leading character of the name is not a
       slash (/), /dev/ will be prepended to the name.

    o  volume_tag - A NULL terminated character string that is the
       expected volume tag on the cartridge to be moved. On robots
       with vision support this string will be compared with the
       volume tag of the cartridge in the source slot and if it
       doesn't match the call will fail. This feature will not be
       used if the volume_tag is NULL or the empty string.

    o  port - A NULL terminated character string that is the zero
       relative address of the port which is to be used as the
       destination of the move.

    o  slot - A NULL terminated character string that is the zero
       relative address of the slot which is to be used as the source
       of the move.

    o  log_info - This is a character array that should be at least
       MRD_MAX_LOG_STRING in length. If this function fails as the
       result of a SCSI error, this will be filled with the formatted
       request sense data. If this function fails as the result
       of an operating system error, the operating system message
       particular to the error will be copied into the array.