I am retiring my 2007 macbook, and updating to a macbook pro. How can I securely delete my files before I donate my old machine to Goodwill?
If you are concerned about data security on a machine you are giving up possession of, you may find the following articles useful:
iCloud: Protecting your data before selling or giving up possession of your Mac
Apple Support: Keeping your confidential data secure during hardware repair
Mac OS X: About Disk Utility's erase free space feature
Retrieving data ...