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One pass is a proven failure against todays forensic tool's. The DoD's recommendation of 7-passes is the minimal.



If someone writes random data to a sector then no police lab is going to be able to figure out what used to be there. If you naively write 1's or 0's or anything predictable then maybe, but a PRNG like Yarrow can generate random data as fast as a hard disk can write so there's no advantage to 1's or 0's any more.

A military lab full of SQUID sensors might be able to find a "shadow" after a pass but not after a few writes.

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The Linux ext-3 filesystem is preferable. Easy to securely wipe, and totally transparent.


ext-3 is a pretty primitive filesystem and will not wipe to disk at all if LVM has an active snapshot.
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock