Supporting_ODS-5

   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.