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.
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
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.
It can erase your hard drive!They can delete your files.
You can use over write programm like ErAce form erace.it
Degausser
dd if=/dev/zero of=/dev/hdxSubstitute the appropriate drive letter for x. Be very careful that you do not erase the wrong hard drive.
Erase the data of Rock Band on your hard drive.
The best hard drive eraser program for PCs is Darik's Boot and Nuke which can be found at: www.dban.org. If you are using a Macintosh, then use OS X's Disk Utility to erase hard drives. In the utility you can set options to securely erase the data.
In order to completely wipe a hard drive on a Canon branded copier, one must format the hard drive. Formatting the hard drive will erase all information. The operating system of the copier can then be re-installed.