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This is how the FBI recovers data.
For example, when you delete something from your PC and from the Recycle Bin, it simply deletes the path to it. Eventually, the data gets written over again. What "wipers" do is go over every bit of code with 0's, several times.
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Brian Griffin: Ah, if my memory serves me, this is the physics department.
Chris Griffin: That would explain all the gravity.
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