Linux.com

I agree with the comments about dban. I used it once on a drive that I couldn't partition due to a hardware failure. It doesn't care, it just overwrites everything on the drive regardless of partitions, file types, etc. The comments about /dev/urandom and /dev/zero are just a couple of the techniques dban uses but it goes a lot farther. Understand that no matter how good you wipe the drive through software (dban, etc.), the data is still recoverable if the information is valuable enough to justify the expense (they wouldn't bother trying to recover your personal data). Destroying the platters is the only technique guaranteed to make the drive unrecoverable.

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