Eraser is an advanced Security tool for Windows to securely destruct,destroy and erase your files and folders from the Hard Disk. Eraser uses overwriting patterns to destroy data based on some of the best of methods including the one used by US Defence.
Eraser can destruct your data by overwriting using one of the following methods
Peter Gutmann’s “Secure Deletion of data from magnetic and solid-state memory” paper
National Industrial Security Program Operating System Manual used by US Department of Defence