Why doesn't Rufus create an USB that can be booted in both BIOS and EFI mode?
If you are using an ISO that can be dual booted in EFI or BIOS mode, you may find that the USB created by Rufus will not preserve the dual EFI+BIOS boot feature.
Especially, the Windows 8 installation ISOs, that support both EFI and BIOS boot, will be converted to either one or the other mode, depending on the option you selected under Partition scheme and target type
: If you select the first option (MBR partition scheme for BIOS or UEFI computer
), the USB will be bootable in BIOS-mode only (even on UEFI systems), and if you select any of the other options, the USB will be bootable in EFI mode only (and not bootable on a BIOS system at all).