Have you an Intel BIOS-based motherboard? Have you installed Fedora 16 only to find that your system will not boot and you end up an the GRUB2 rescue prompt wondering what to do? The solution is simple and I will explain it to you in a moment. The problem is due to the way the Intel BIOS developers choose to implement their code based on their understanding of the PMBR (Protective MBR) GPT specification. If you want to read this specification in full, you need to read Section 5 of the UEFI 2.3 specification together with T13 EDD-4 revision 2.