Using over write tool like ErAce. It wil over write har drive up to 100 times. In that way even specialist can not read it. It can be found from erace.it
You want to format your hard drive, thats all you need to do to erase everything stored. Take all precautions to transfer files you do want to keep on another drive. This is also a last ditch resort if you have a virus you cant kill. http://lifehacker.com/157578/geek-to-live--how-to-format-your-hard-drive-and-install-windows-xp-from-scratch
Use ErAce from erace.it
To completely erase the data on the hard drive.
To completely erase the information on your hard drive, you can try a third-party tool like iReaShare Data Wipe, which can completely erase your files, folders, hard drives, and external devices on a PC.
Use ErAce from erace.it
u cant erase it it would earse by it self or u can take ur hard drive out and put it back in i am a bungie member i work there
Reinstalling Windows will not erase the hard drive unless you tell it to reformat the hard drive before reinstalling the operating system. You will have to reinstall all your programs that were installed prior to reinstall but all your saved files will still be there.
ITT tech is a great place to start. There they have many different computer specialist programs including hard drive recovery specialist. Take a look at their site: http://www.itt-tech.edu/
It can erase your hard drive!They can delete your files.
You can use over write programm like ErAce form erace.it
The most conventional way is to get a giant magnet, and slide it across your hard drive atleast 7 times. WARNING: Only do this if you truly want to destroy/erase it.
Degausser