The MOVE DRMEDIA or QUERY DRMEDIA command displays the message. The volume being processed has associated with the device class name shown that is not defined to the server.
The command is not processed if the volume is explicitly specified on the command. If a volume pattern is specified on the command, the indicated volume is not processed, but the other volumes not associated with the indicated class are processed.
Reissue the command after the indicated device class is defined to the server.