Darik's Boot and Nuke for CD and DVD
Full user review
"Seems to work well if your OS is intact"
Used on an Asus with two HDs. Cleaned the first HD beautifully.
Followed instructions but couldn't get dban to skip from the first HD to the second. Also used on an eMachine with a corrupt OS. Failed twice. Upon third try (and third DVD copy), drive was inaccessible. Had to be destroyed physically.
I would use this product again if I wanted to completely clean an HD on a working PC prior to installing a new OS; however, if I had to fix the OS prior to using this product, it wouldn't be worth the time.