Originally Posted By: Shonky
That said, it is free though and the author/owner doesn't seem to want make any money from it.

I tend to make a judgment call on free software by the way its presented. That site leaves me a little...skeeved. At the very least I'd try to find out what other folks on the net are saying about it before using it (not just CNet). I think JKDefrag has been put through its paces pretty well.
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Matt