I must return my laptop so I need to do some work... SO is W7 64bit Enterprise version. I need to wipe my external HDD. DBAN does not sound like an option because I want just the external HDD wiped. I thought about encrypting it with Bitlocker and then format it afterwards. Next, how to securely delete about 70GB of files from my primary HDD? Just delete them and then run Privazer to empty the bin? Any thoughts? Thanks.