I've decided the 13" MBA just isn't powerful enough for my day to day needs. I've tried it for a month and my unique needs just require the power of a i7 or higher processor. But I love the thing and don't want to sell it. That said, I am going to give it to my secretary who hates the 11" (too small even for her) and then return that one, giving her the 13" MBA instead. I want to do a clean wipe and reinstall of the OS for the 11" before I take it back. Does the USB key "restore" function effectively wipe out the data on the drive or do I need to go for more exotic utilities to do this?