Mac OSX has a secure erase feature built into the operating system. To securely erase a file, drag your file to the trash as normal.
Instead of emptying the Trash, Go to the Finder menu and select Secure Empty Trash.

If you need assistance or have questions, contact the ITSS Help Desk (ext. 8847 or email helpdesk@d.umn.edu).
Rev: 04.06 dee