Library /sys$common/syshlp/DFUHLP.HLB
DFU, INDEXF, Qualifiers, /EXTEND
 *Conan The Librarian 

    /EXTEND=n (number of blocks)

    Extends INDEXF.SYS with 'n' blocks in 1 new fragment. This is
    equivalent to 'n' extra file headers. The disk must be clusterwide
    dismounted before starting an extend operation.
    The 'n' value will be rounded up to be a multiple of the device
    cluster size.
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