Anyone familiar with or used any of these apps?
Both are for secure overwriting deleted information/data from disk free space.
Sdelete is a small 45KB command line utility. Very easy to use. But be careful.
Eraser is 9MB install that runs in Windows. More options but still pretty easy.
Both these apps will wipe your whole hard drive clean if you so choose.
So be careful what you choose and make backups just in case.