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The NSA/Department of Defense certification, from what I've read (you can find a lot on .gov public websites) is 13 successive overwrites (all 1s, then all 0s, then all 1s, etc.).
Then they take the harddrives through a "bulk eraser." For what that does, think of what happens when you hit "DeGauss" on a monitor, and imagine a fucking huge magnetic field hitting the harddrive.
Then they take steel wool scrub brushes and polish the harddrives.
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Eat antimatter, Posleen-boy!
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