Let say you have a hardisk from your computers, and not using it. The data space may be too little to even become your extra hardisk, so you just dump it in your trash bin? No! Destroy it, seriously. Not just merely formatting your hardisk, you need to physically destroy your hardisk to prevent from information theft because by using advanced techniques, fraudsters can hack into your hardisk and extract your sensitive information. While we might suggest the techniques in the video below, it is not easily attainable so maybe you could try to physically hack the hardisk and make the drive platter unreadable.