PerfectDisk Free Defrag
Spectacular
Full user review
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"Not bad but there are better free defrag tools"
Pros
It does improve the system performance but there are other defrag tools doing better.
Cons
Limited features, slow and uses a lot of resources!
Summary
Better defrag tools are Puran Defrag 1st in my list, then Defraggler and finally Auslogic :)