The Disk File Optimizer (DFO) software reduces file fragmentation
    on a device while that device remains on line to users.

    This software is compatible with any Files-11 structure level 2
    (ODS-2) formatted volume including single volumes, bound volume
    sets, stripe sets, and shadow sets.The file defragmentation
    utility is also compatible with ODS-5 formatted device on OpenVMS
    Alpha 7.2-1 and above.

         Operating   OpenVMS VAX (Version V6.0, V6.1, V6.2, V7.0,
                     V7.1, V7.2 and V7.3)
         System and  OpenVMS AXP (Version V6.1, V6.2, V7.0, V7.1-2,
                     V7.2-1, V7.3, V7.3-1, V7.3-2 and V8.2)
         Version

         Software    Disk File Optimizer V2.9
         Version

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