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Advice regarding servers and Wiping Drives after testing

Subject: Advice regarding servers and Wiping Drives after testing
Date: Fri, 31 Aug 2007 21:37:08 +0100
Can someone explain why anything would be left after running :

dd if=/dev/zero of=/dev/hda

Wouldn't this write zeros across the entire disk? How could anything
be recovered afterward?

I see osx disk utility can with write zeros once, or write zeros many
times. Is there any advantage in multiple writes?

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