Advanced File Shredder is a tool created to help Mac users with their privacy. Deleting a file just removed the reference to that file from your Hard Disk. Modern digital forensics techniques can recover your deleted files fast and easy. The application is using one of the best data shredding algorithms: Guttman and US DOD 5220.22-M. Besides the advanced data shredding, you can fill up deleted files with random zero-data for impossible data recovery. Speed & security depends on the number of passes chosen. Overwrites all addressable locations of the file with random characters before deleting.