Darik's Boot and NukeI assume by "emergency" destruction they're referring to a scenario I'd rather not think about too much.
Darik's Boot and Nuke ('DBAN') is a self-contained boot floppy 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.
Update 10/10: Seemed to work perfectly. Downloaded the zip, ran the executable that creates the floppy, rebooted, hit enter, selected drives to wipe, accepted the default (medium security). Took about two hours to wipe two drives simultaneously. Of course I don't know how good the erasure is, but I'm betting it's pretty good. I trashed the diskette, I've no need to keep a 'loaded diskette' in the house. I give away a machine every few years.
kw: Linux, diskette, disk, wipe, clean, purge