You could also use something like DBAN, which is a DoD compliant drive wipe program. It will be a little time consuming though as the software writes to the drive multiple times. The only person recovering the data after that would be a three letter government agency and even then I think they'd be hard pressed to get anything off of the drive. If they did it would be prohibitively time consuming. There's no way in hell your drive by criminal will be getting anything off the drives.
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