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Darik's Boot and Nuke ("DBAN") is a free, self-contained boot floppy/CD that
securely wipes the hard disks of most computers. DBAN will automatically and
completely delete the contents of any hard disk that it can detect, which
makes it an appropriate utility for bulk or emergency data destruction.
http://dban.sourceforge.net/
It is also contained, among other free disk wipers and pc utilities,
on the Ultimate Boot CD.
http://www.ultimatebootcd.com/