February 07, 2012, 5:35 PM — Here's how you can set your Mac OS X trash can to always delete data securely.
1. Open a Finder window.
2. Go to menu, choose File then Preferences.
3. Click the Advanced icon.
4. Click the check box next to Empty Trash Securely.
For more, see the original article at the link below.

Secure Empty Trash in Mac OS X Lion | Apple Forums














