VMS Help  —  CREATE  /DIRECTORY  Qualifiers  /ALLOCATION
       /ALLOCATION=n

    Specifies the initial number of blocks to be allocated to each of
    the specified directories. The default allocation is 1 block.

    This qualifier is useful for creating large directories, for
    example MAIL.DIR;1. It can improve performance by avoiding the
    need for later dynamic expansion of the directory.

    This qualifier does not apply to Files-11 ODS-1, ODS-3, or ODS-4
    volumes.
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