▒ HARDWARE Motherboard: Gigabyte X570 Aorus Ultra BIOS: F34 [F35b breaks compatibility with Windows 7] I think that guide will be useful due to nightmarish non-ergonomic structure of Gigabyte’s BIOS menus. ▒ UEFI vs MBR Windows 7 supports UEFI only partially, there is no native handling of this modern tech. I don’t see any reason to use UEFI, only if you want to boot from drive which is larger than 2TB.