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[–] jackfraser 0 points 0 points (+0|-0) ago 

A single pass of zeros is sufficient for just about any hard drive bigger than an early 80s 10mb ST-566 disk. Even at that time, an electron microscope was needed to guess what individual bits used to be prior to wiping, and that has a pretty high error rate.

There's no way anyone's recovering from a full zero wipe; and if you want, you can do a random wipe or a multiple pass wipe with a tool like DBAN, but it's probably unnecessary.