Magnetic tape drive (3420, 3422, 3430) demount recording

A demount (DDR swap, CLOSE/EOV request, EOD command or deallocation condition) that involves an IBM® magnetic tape drive (3420, 3422, 3430) causes a record to be built. The record contains environmental and statistical data that describes the magnetic tape drive having the tape demounted. Offset 2 of the OBR record format indicates that the record was written because of a volume demount.

Note: For magnetic tape drive (3420, 3422, 3430) demounts, the sense information, failing CCW in residence in an address space or a data space, and SCSW fields of the OBR record formats are not valid.