Boot from a USB Drive or an Optical Drive using Windows 10
If your Windows 10 computer has a UEFI motherboard, it is possible to choose a different device to boot to, from inside Windows. You no longer need to remember some special keystroke which varied from the motherboard to motherboard and press it just at the right time while your PC is booting. warning: This feature will not be available if you are booting in legacy BIOS mode, even if your board supports UEFI.