Secure File Shredder will remove files from your hard drive without fear they could be recovered.There are quite a few software tools today for retrieval of deleted files under OSX.
Secure file shredder uses the DoD 5220.22-M method to overwrite the data and make sure it cannot be recovered.
The DoD 5220.22-M sanitization method was originally defined by the US National Industrial Security Program (NISP) in the National Industrial Security Program Operating Manual (NISPOM) is one of the most common sanitization methods used in data destruction software.
