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"Did you know that Apple, maker of the iPhone, also makes computers? It is true! You might even own one yourself! This tip is for those of you looking to sell  your Mac to get an iPhone (or if you're selling it for any other reason in fact). Our friends at Small Dog Electronics have posted some tips on securely erasing your Mac's hard drive BEFORE you sell it to some random dude.Sure, you can just nuke and pave (aka reinstall OS X), but if you're using OS X 10.4 the Disk Utility can make sure none of your data will be readable from that drive (or least not without extreme effort). Head on over to Barkings and check it out."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2007/06/29/selling-your-mac-erase-that-hard-drive/>