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I have a bootable USB drive.

Is it possible to boot a MacBook Pro from it, and if so, how?

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Sure - restart your computer and hold down the command option key while it's booting. Eventually a few icons will pop up on the screen and you'll be able to choose which device you want to boot from.

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Correction: it's the Option key you hold to get the startup manager. – Gordon Davisson Sep 19 '10 at 17:12
Jeez - I should really know that since I use bootcamp at least a few times per month. – wtollett Sep 20 '10 at 17:28
Maybe it would be a good idea to change your answer accordingly ;) – Wuffers Oct 8 '10 at 22:57

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