EFI stands for Extensible Firmware Interface, and is an updated version of BIOS. It sits between firmware and the operating system in the software stack.

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Snow Leopard 64 bits mode (EFI64 Firmware)

How do I get the EFI64 firmware on my iMac 20" (late 2006) with Intel Core 2 Duo?
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Convert a GPT disk to MBR from XP

So I took some files with me on my external HDD while going on vacation. Through a series of events, I ended up storing the data in a NTFS formatted partition defined in a GUID Partition Table. The ...