These are all potential reasons for booting to an external device, among many others. Perhaps you’ve got a cloned backup of your entire Mac on an external hard drive and you want to make sure it’s bootable. Or maybe you’re trying to boot from a USB flash drive that has a clean install of OS X on it for troubleshooting purposes. Let’s say you need to use the Mac OS X installation disc that came with your computer to reformat the hard drive and put it back to factory settings. Apple made it easy so all you need to know is just a simple keyboard command. You agree that you are solely responsible for any breach of your obligations under this Policy & Agreement and for the consequences (including any loss or damage which may suffer) of any such breach.At some point, you may find a need to boot your Mac from a disc or a drive other than the primary Mac OS X startup volume. You agree that you will not duplicate, reproduce, copy, sell, trade or resell the Website for any purpose. You agree that you will not engage in any activity that disrupts or otherwise interferes with the Website (or the servers and networks which are connected to the Website). You specifically agree not to access or attempt to access the Website, or any portion thereof, through any automated means, including but not limited to the use of scripts or web crawlers.

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