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Darik's Boot and Nuke - DBAN
Darik's Boot and Nuke ("DBAN") is a self-contained boot disk 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.
Download DBAN - http://www.dban.org
Kicking off the process. This part of the launch process can take a few minites ... don't panic!