VMS Help ANALYZE, /AUDIT, /SELECT, DISMOUNT_FLAGS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    DISMOUNT_FLAGS=(flag-name,...)

    Identifies the names of the volume dismounting flags to be used
    in selecting records. Specify one or more of the following flag
    names: Abort, Cluster, Nounload, and Unit.