The SCSI-2 specification includes two commands which allow a
    medium-changer to perform most of the work that this routine
    does by brute force. Unfortunately, a reliable implementation of
    these commands was unavailable at the time MRD V1.2 was written.
    A future version of the API may be able to make use of these
    routines to speed up a search.

    Unlike mrd_show(3mrd) this routine will open and close the robot
    at each iteration.