01-20-2016
02:51 AM
- last edited on
03-06-2024
10:30 PM
by
ROGBot
03-14-2018 05:55 AM
06-16-2018 04:22 PM
aceisme wrote:
A UEFI system can boot only from a GPT disk, not MBR. 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.
Most UEFI motherboards come with a Compatibility Support Module (CSM), which is enabled by default. 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. If you want to run your system as UEFI, you need to disable the CSM via the motherboard's interface before you install Windows.
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.
After Windows is installed, msinfo32 (System Information) will show the BIOS mode as UEFI, not legacy.
06-17-2018 01:27 AM
ExGreyFox wrote:
That being said if I were installing Windows 10 on a 970Evo 500GB NVMe M.2 in a ROG Maximus X Formula, would I need to change CSM to disabled and then under secure boot chnage the OS type to "other type" and clear secure boot keys?
06-16-2018 09:17 PM
03-05-2019 03:11 AM
JustinThyme wrote:
I cant speak directly from your board but on a similar buid 7700K and M9F I had to leave the CSM enabled to get it to boot from the USB. Dont remember having issues later setting to disabled. When windows wont boot on any issue like this whats worked for me is to go back a step, let windows boot, reboot to safe mode, then turn CSM off and save and exit. Then it willl boot in safe mode. restart...done
10-21-2019 03:58 AM
10-30-2019 06:04 PM
npapanik wrote:
My config:
- Asus Prime X470-PRO with latest BIOS (5220)
- Asus ROG Strix RX VEGA56
My problem is that when I disable CSM support in the BIOS, I cannot get into BIOS again whatever I do, SHIFT+restart in Windows 10 or press DELETE or F2 at boot sequence. When I do these two actions my monitor (Dell SE2717H connected via HDMI) pops up a message that the resolution is not supported! So it seems that the system is in the BIOS screen but the output resolution is wrong...
Note that Windows are working perfectly OK, its just that I cannot get to BIOS. If I reset the CMOS I am able to get to BIOS again but CSM is Auto in the default BIOS settings.
I am the only one having this?
07-16-2020 12:11 PM
jamith wrote:
Asus ROG strix B350-F with BIOS 5220, I have the same situation, Im unable to get to the BIOS after disabling CSM.
07-20-2020 02:15 PM
mBrane wrote:
Try an HDMI cable at bootup, if you're using DisplayPort. I do this, then switch to DP after Windows boots (I have a different issue, but have found this to work when system is POSTing and you're having video issues). Good luck!