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Originally Posted by Rekna
Simply writing 0's one time to the drive will not erase it. It is magnetic storage meaning past writes can be retrieved by looking at the lower frequencies. You need to write zeros many more times than once. Also a girl got in major trouble for doing this because it was easy to prove she had done this and the judge used that as 51% guilt and the case went to the RIAA.
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I haven't heard of the case, but the tests that show data from overwritten drives can be recovered were done with ridiculously low density media compared to today's technology. If you're really worried, overwrite it with random data, but unless you're protecting state secrets, doing 3 writes is paranoid and 7 is ridiculous.