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What is the difference in “Boot with BIOS” and “Boot with UEFI”

I keep hearing about Windows8 now supporting UEFI. Can someone explain concisely what it means and how it is different from the traditional BIOS?

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marked as duplicate by KronoS, Moab, nhinkle Oct 31 '12 at 1:39

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
Related: superuser.com/questions/332962/… –  Canadian Luke Oct 30 '12 at 22:43
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Not a Windows 8 question :-) –  Mikhail Oct 30 '12 at 22:43
    
See also superuser.com/questions/496026/… –  Matthew Wong Oct 30 '12 at 22:44
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up vote 2 down vote accepted

UEFI is similar to an OS like BIOS but is not tied to any architecture. Also, UEFI is an interface and can be implemented on top of a BIOS.

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