VMS Help  —  MRD Library, mrd_move, Return Values, MRD_STATUS_DEVICE_INVALID
    This error code is used when an OpenVMS system service fails with
    the status SS$_NOSUCHDEV or SS$_IVDEVNAM. This will typically
    occur in mrd_startup(3mrd) when the caller tries to open a device
    which doesn't exist or uses an invalid device name.

    This error also occurs when the routine is called on behalf of
    a device controlled by the JU driver. The Media Robot Utility no
    longer uses the JU driver.
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