How do I Erase the Hard Drive Completely Clean for Free?
When a hard drive is overrun with antiquated files that are causing the hard drive to slow down, the files need to be erased. To properly erase all files on a hard drive, the hard drive needs formatted. Formatting will thoroughly erase and clean the hard drive. Formatting is free, and no programs are necessary, as a format utility is built into the operating system.
Click the "Start" button.
Click "Computer." A menu displays all of the hard drives and storage devices.
Right-click the hard drive that needs erased. Left-click "Format."
Change file systems in the "File system" box. Once finished, click the "Format" button.