Two questions related to BIOS emulation: I have a mid 2010 model iMac, does it support BIOS emulation? How can I find out? Assuming I completely format my hard disk, how do I enable BIOS emulation, is it enough to have a hard disk with MBR partition table? Rationale / Background: I would like to dual boot Windows 8.1 and Ubuntu 14.04 on my iMac. I have no need for OSX (I have an external emergency USB HDD on which I have OSX 10.8 installed in case I ever need it). Since I do not intend to use OSX on my iMac, it would not be recommended to use EFI to boot either Windows 8.1 and Ubuntu 14.04 because as far as I know, at least on the mid 2010 model iMac, Apple has implemented their own brew of EFI based on 1.x version and that apparently requires the "bless" feature in OSX for smooth operation and avoiding problems. So I would like to install and boot both Windows 8.1 and Ubuntu 14.04 in BIOS emulation mode.