We upgraded to the new unibody macbook and want to sell our old core duo, 2.0 GHz running Tiger. I want to clear all of our personal data, but the superdrive is hit or miss as far as when it wants to work, and today it's completely miss. I don't care about saving any of the applications we've added, as I wasn't going to include them anyway, but is there a way to clear our info off of the hard drive without needing the optical drive for recovery? Can I do it without deleting and reinstalling the operating system? If not, can I use an external hard drive to boot from? Do I have any options without paying to get a new superdrive? I have a buyer that has a new superdrive, but I'd rather not install it before the sale since I don't trust someone messing around the inside of my macbook that isn't authorized, and I sure as heck don't want to trust him to do the reinstall and erase all of my data. Thanks for any input you guys may have.