by Tina Gasperson

Chances are your computer is set to check your main CD drive for a bootable CD at boot time, and if there’s not one there, to boot from your main hard drive. Most of the time, that’s exactly what you want and there’s no need to change the order in which your computer looks for booting instructions. But if you wanted to run an alternative operating system from a memory stick, you’d need to tell your computer to look there first for its “marching orders,” so to speak.
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