Auslogics Disk Defrag
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Full user review
Works better than the defrag that comes with Windows 7
None that I can find.
I know this is not a real reason to use a program but it reminds me so much of the Windows XP defrag program that I used to love and when I started seeing how well it worked and that it actually helped with performance I was sold. (as much as one can be sold on a free program)