Ughhhh... CSM

[PartyDJ]

I have a Intel Optane stick. I found out u have to disable CSM. So I did that and I saved and exited and then after it has rebooted it went into the BIOS Menu again. I looked at the boot options (drives) and all of them were gone. I once again turned on CSM and it booted alright and without any problems. WTF is this happening?

[PartyDJ]

And yes, I updated BIOS

[Sniperfox47]

26 minutes ago, PartyDJ said:

And yes, I updated BIOS

Do your drives have UEFI System Partitions?

 

If you previously installed Windows with CSM enabled it may have gotten confused and installed in BIOS mode.

 

Where do they not show up? As boot options or under lists of drives the controller config?

[PartyDJ]

8 minutes ago, Sniperfox47 said:

Do your drives have UEFI System Partitions?

 

If you previously installed Windows with CSM enabled it may have gotten confused and installed in BIOS mode.

 

Where do they not show up? As boot options or under lists of drives the controller config?

1. No idea

2. I installed windows in CSM (Can I change it?)

3. As boot options

[Sniperfox47]

22 minutes ago, PartyDJ said:

1. No idea

2. I installed windows in CSM (Can I change it?)

3. As boot options

Yeah any drives that do not have a UEFI System partition with a bootable bootloader won't show up as a boot option. UEFI doesn't boot "drives" like bios did, it boots files stored in that system partition. A single drive can actually have multiple different bootloaders.

 

Depends on your OS.

 

For Windows:

It's probably easier to just back up and reinstall with CSM disabled. Make sure when you reinstall you totally format the drive and reinstall from scratch so Windows install will convert it to GPT.

 

You theoretically can switch. I have in the past. You need to resize your patitions to make extra room, convert your drive from MBR to GPT, create a UEFI System partition, and then use a window install usb to manually recreate the bootloader. It's a PITA. Don't try it unless you're sure you know what you're doing because it's easy to make Windows unbootable.

 

For Linux systems just resize to make some room (preferably 100+ MB), make a UEFI system partition, mount it in /boot/efi, and then install a UEFI bootloader like refind or grub2-efi. You should probably convert your drive from MBR to GPT as well, but it's not necessary.

 

For dual boot systems I'd suggest just fixing it for Linux and reinstalling windows the same way as above. Remember to back up.