dc3dd wipe=/dev/<drive>

or

dd if=/dev/zero of=/dev/<drive>
..or replace with zero with urandom for randomness.

These will do a 1-pass to the entire disk with zeros. You can even confirm
with a hexeditor. If someone still gets your residual data by physically
playing around with the platters in a clean environment they probably
deserve it =)

--
Jeremy MountainJohnson
Jeremy.MountainJohnson at gmail.com


On Thu, Jan 19, 2012 at 5:16 PM, Jeff Jensen <jjensen at apache.org> wrote:

> I have a few older PCs that I want to wipe the drives very well and
> donate.  Googling, I see quite a few apps to do so.  What are current
> top recs and approaches any of you have done?
> _______________________________________________
> TCLUG Mailing List - Minneapolis/St. Paul, Minnesota
> tclug-list at mn-linux.org
> http://mailman.mn-linux.org/mailman/listinfo/tclug-list
>
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