/TRUNCATE(=n) This qualifier is only valid in combination with
    /COMPRESS. After compressing a directory DFU will NOT truncate
    the empty blocks at the end of the directory, unless /TRUNCATE is
    specified. A number 'n' may be specified to let DFU truncate no
    further than 'n' blocks ('n' will be rounded up to a multiple of
    the disks cluster size). Example: a 60 block directory A.DIR can
    be compressed to 20 blocks. The results are:

    o  DIR/COMPRESS -> A.DIR size 20/60 blocks

    o  DIR/COMPRESS/TRUNCATE -> A.DIR size 20/20 blocks

    o  DIR/COMPRESS/TRUNCATE=40 -> A.DIR size 20/40 blocks