/BRIEF (default)
       /NOBRIEF

          The /BRIEF qualifier has meaning only when the /LOG
          qualifier is also present. The /BRIEF qualifier
          requests a brief log of all actions taken by the
          defragmentation process. This log includes beginning
          and ending volume status information. The /BRIEF
          and /FULL qualifiers are mutually exclusive, and
          /NOBRIEF produces the same result as /FULL. The
          /BRIEF qualifier is the default.