VMS Help MERGE, Output File Qualifiers, /CONTIGUOUS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Requests that the output file be stored in contiguous disk
    blocks, thereby decreasing access time. Note that you must also
    specify the /ALLOCATION qualifier because if the preallocated
    space is too small, OpenVMS RMS may be unable to extend the file
    contiguously.

    Format

      output-file-spec/CONTIGUOUS

  Additional Information (explode) :

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