We all run out of hard drive space sooner or later. Fortunately large drives are now cheap, and installing one is easy. But doing so also leaves you with a question: you’re old drive is probably perfectly good and can be used by someone else, but it contains your sensitive data, so before you give it away you need to wipe it clean. The tool you need is Darik’s Boot and Nuke, a bootable CD ISO file to securely wipe hard drives.