/LOG={file-spec}
       /NOLOG (default)

          The /LOG qualifier causes the defragmentation process
          to create a file containing a list of all its
          operations. The information in the log file varies
          with the presence of the /FULL or /BRIEF qualifiers.

          The /FULL qualifier lists all files analyzed by the
          defragmentation process and reports their disposition
          during each phase of defragmentation.

          The /BRIEF qualifier lists only the statistics of
          each phase, such as number of files analyzed, and
          number of files defragmented.