You can permanently wipe confidential data from your Mac using Stellar Wipe Mac utility. This tool permanently deletes sensitive data from Mac, beyond the scope of data recovery. It is compatible with Mac OS X 01.7, 10.6, 10.5 and 10.4. You can use the Stellar Wipe Mac in below cases: When you want to sell your old hard drive.Selling off the old Mac.You want to destroy any personal information so that no one could ever retrieve it again. The free demo version is available on http://www.stellarinfo.com/data-safety-eraser/wipe-mac/file-eraser-mac.php. The full registered version is available for $29 only.