/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:

 	DIR/COMPRESS 	            -->  A.DIR size 20/60 blocks.
 	DIR/COMPRESS/TRUNCATE       -->  A.DIR size 20/20 blocks.
 	DIR/COMPRESS/TRUNCATE=40    -->  A.DIR size 20/40 blocks.