Set the wim path to :\install\win7\source\boot.wim / \install\win81\source\boot.wim etc. Using bootice create new entries in the uefi bcd for each of the windows installs. For best compatibility you will need 2 usb sticks - one mbr and one gpt.Įxtract the whole of the win7 install iso into the win7 folder etc.
If you want to dual boot bios / uefi then you will need to format as mbr but the usb drive may not boot in all uefi computers then. Its hard to get a usb stick that boots on every uefi pc. Uefi on PC is still an imature technology. If you are lucky your uefi firmware will support ntfs booting ( my asus rampage 5 extreme does ) - and you will not need the small fat partition. You will need to disable secure boot if you go this route. If your wim files are > 4GB then use rufus to format the USB drive as gpt with a large ntfs partition and a small fat partition with a ntfs uefi driver. Use gpt instead of mbr format for best uefi compatibility. Many options are described on these forums for formatting the usb drive. Format your usb drive as fat32 assuming all your wim files don't exceed the max fat 32 file size limitations ( 4GB).
