short of taking it to data recovery, there's not much you can do.
Files you delete on your hard drive remain until they are overwritten, but there is an index that keeps track of where files are stored, and once your stuff is deleted from the index it's extremely hard to find the pieces and put them back together... you certainly can't do it by yourself, I'm not sure how professionals do it either.
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The government can put a gun in my hands and send me to die in Iraq, but I can't buy a beer.
I fucking LOVE the USA.