![]() ![]() The first two wipes theoretically pull the magnetic field fully one direction, then fully the other, eliminating any residue of the original value. A three-letter agency may be able to recover data from a zero-wiped drive, but if your opposition is a three-letter agency, you really should be looking into physical destruction instead.ĭoD 5220.22-M seven-pass: I haven't been able to find a description of this, but I suspect it's a variation of the three-pass wipe, only with three values and their inverses.ĭoD 5220.22-M three-pass: Overwrite the data with a value, then with the inverse of that value, then with a random value, verifying the write after each step. ![]() For modern hard drives, the main difference is how long it takes - the quality of the wipe is effectively constant between them.
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