One other point to note.
With the current drive technology and the way that Windows and NTFS handle the data on the drives, defragging does not offer the performance increases that it used to on loder systems. It would probably only show up on a performance diagnostic program, and then only in increments that you would probably not be able to detect in the real world.
In fact, many system files are deliberately broken up by the NTFS system for better performance.