EFI ... UEFI ... hybrid Apple ...
Is there a easy, definitive, obvious way to tell which bootcamp partition is in use?
Something everyone here can look for?
Apple computers use EFI
PC's use UEFI, macs do not use UEFI.
Apple Bootcamp has two parts. One creates the hybrid bootable windows partiton for you to install windows on. The other is just a collection of hardware drivers so windows can control the mac properly.
If you used the apple bootcamp utility to create your windows partition before you installed it, you're in the hybrid bootcamp mode.
If you directly installed windows on a BLANK hard disk with no assistance from apple at all, just treating the mac as if it was a PC, it will be EFI mode. When you put the windows dvd in, and hold OPTION to choose to start from it, it will have two choices, "windows" and "efi boot". Choose EFI boot, and windows will install itself in EFI mode.
Its VERY IMPORTANT that when you install windows in EFI mode on a mac pro, you remove the other hard disks including the one with OSX on it. The windows installer will sometimes create its hidden system partition on the wrong hard disk. So removing all but the one your installing to, stops that chance from happening.
The advantage of EFI mode is faster booting, no bios translation for the partition info, and windows can take advantage of all the EFI features of the motherboard firmware. The boot screens also run at a higher resolution when in EFI. There may be other advantages, I'm not an expert on EFI.
The mac pro 5,1 can install windows 8.1 and 10 in EFI mode with no problems. I'm not sure about older macs, and I know that only some of the laptops can do it.
If I have anything wrong here, or made any mistakes, other mac techs are welcome to correct me. I'm just informing based on what i have done on the computers I have.