Guidelines for Media Sanitization
"Advancing technology has created a situation that has altered previously held best practices
regarding magnetic disk type storage media. Basically the change in track density and the
related changes in the storage medium have created a situation where the acts of clearing and
purging the media have converged. That is, for ATA disk drives manufactured after 2001
(over 15 GB) clearing by overwriting the media once is adequate to protect the media from
both keyboard and laboratory attack."