Your UEFI system can boot only from a device that has an EFI boot loader, so after the CSM has been disabled, the only boot devices that are listed will be UEFI aware.Īfter Windows is installed, msinfo32 (System Information) will show the BIOS mode as UEFI, not legacy. If you want to run your system as UEFI, you need to disable the CSM via the motherboard's interface before you install Windows.
It makes the motherboard actually look like a BIOS system, allowing it to boot from NTFS and MBR disk, but you lose the UEFI features and are essentially just using BIOS. Most UEFI motherboards come with a Compatibility Support Module (CSM), which is enabled by default. A BIOS system can boot only from an MBR disk and not GPT, which is why you can't take an OS disk from a BIOS system and put it in a UEFI system and expect the system to boot.
A UEFI system can boot only from a GPT disk, not MBR.
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