Use Hardwipe to permanently erase (or "hard wipe") data on disk and portable storage media
to ensures that discarded, but sensitive, information can never be recovered by someone else.
Hardwipe for Desktop is free for non-commercial use.
See feature map.
Hardwipe Portable Edition provides a
USB runnable alternative which can easily be combined with Windows PE
to create a modern boot and nuke data sanitization solution with a graphical user interface.
Video & Screenshots
When your old data may be more valuable
to someone else than you, don't just delete it — Hardwipe it!