Shredder for your computer
Hardwipe can shutdown your computer automatically when finished — so you can simply leave a lengthy job running. Useful when cleaning large hard-drives, which can take several hours.
Hardwipe is a free document shredder for your computer. It erases file contents and cleans unused hard-disk space to prevent personal and business information from ever being recovered. Hardwipe erases files by overwriting their contents prior to deletion. It can also clean free disk space to ensure that all previously deleted data is overwritten, and can even purge the swapfile used by Windows itself.