disable the paging executive in the same area of the registry. this means that data is never written to disk, ever. but as w2ktech notes this doesn't affect slack space orfreespace. for this i use a file shredder, that came w/ giant, so instead of delete, you right click a file and 'shred'. but thenagain, i'm not actually that paranoid, just don't want my family finding my porn when i die.
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