Applications that do not support the new ODS-5 volume
    structure do not operate successfully on these volumes even
    if they encounter only traditional file specifications.
    These applications use physical or logical I/O to bypass the
    file system when they access the volume or access directory
    files or other metadata files directly, and therefore must be
    installed with privileges or run by a user who has privileges.
    These applications are usually system programs, such as disk
    defragmenters, or programs that try to avoid overhead by
    accessing the disk directly. These applications rely on specific
    knowledge of the file or directory structure on the disk which
    has changed with introduction of the ODS-5 structure.

    Recommendations: Applications should use documented interfaces
    and structures whenever possible.