Did disabling CSM cook my boot drive partition?

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zll

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So I got my brand spanking new 9070 this morning and installed it on my Windows 10 pc.

But I remembered I had to enable resizable rebar to enjoy all its glory. So I found the following video with instructions and followed them:


However my computer refused to boot, and I even got the Gigabyte message preparing automatic repair.

I reverted the changes from the video and Windows refuses to boot. It's detecting the drive as bootable, but no luck getting it to actually start.

Is there any chance something happened when I removed the drives to install the card? Or did changing this setting cook the boot partition? I didn't check if it booted into windows before changing these settings.
 
Did your secure boot setting change when disabling CSM ? I seem to recall having something similar a while back.
Google tells me it forces EUFI mode when disabled, so if you installed windows in legacy mode then maybe that's where the issue lies.
 
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Zuner said:
Did your secure boot setting change when disabling CSM ? I seem to recall having something similar a while back.
Google tells me it forces EUFI mode when disabled, so if you installed windows in legacy mode then maybe that's where the issue lies.
Click to expand...

No luck forcing to legacy mode.

Should I try resetting the bios to optimized defaults?

I really don't want to have to wipe my OS without getting a few things off first...
 
zolly said:
No luck forcing to legacy mode.

Should I try resetting the bios to optimized defaults?

I really don't want to have to wipe my OS without getting a few things off first...
Click to expand...
Worth a shot, but save the current bios settings first, so you can easily revert.
Judging by your description of is seeing the drive as bottable but not booting points to something simple like legacy boot or secure boot settings
 
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Zuner said:
Worth a shot, but save the current bios settings first, so you can easily revert.
Judging by your description of is seeing the drive as bottable but not booting points to something simple like legacy boot or secure boot settings
Click to expand...

I'll check secure boot and see.
 
zolly said:
Or did changing this setting cook the boot partition? I didn't check if it booted into windows before changing these settings.
Click to expand...
Unlikely,sounds like WIndows is trying to Boot but the OS disk is unbootable in the current state (so likely the "revert" didn't fully revert everything)

Try the modes and their subsettings, UEFI,Legacy,CSM,Secure boot on off
 
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Is it possible that the windows repair that it tried to do cooked the boot files?
 
So discovered pebcak. I had the wrong drive plugged in for boot.

That being said, I then plugged in the right boot drive and no luck. Put the drive into an external bay and the partition data is completely gone. It wants me to reformat it.

Sigh. At least there was nothing critical on it...
 
CSM is not supposed to 'cook' your drive. Odd that your partition is gone, so I would assume that your partition is not recognised. A driver repair won't work, you need to convert your partition or wipe the partition. Sometimes conversion screws with the bootloader, and then you need to resolve that. I would advise a reinstall.
 
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Sorry man, damn well hate it when crap like this happens, was supposed to be a joyus occasion getting a new GPU then something like this happens, I know the pain.
 
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And used diskgenius to take a look. Turns out the data is still there. Just the MBR that's boned. Dumping the data I need and going to do a fresh windows 11 install.
 
Fulcrum29 said:
CSM is not supposed to 'cook' your drive. Odd that your partition is gone, so I would assume that your partition is not recognised. A driver repair won't work, you need to convert your partition or wipe the partition. Sometimes conversion screws with the bootloader, and then you need to resolve that. I would advise a reinstall.
Click to expand...

I think it was Windows trying to repair the drive after I changed the bios settings. Don't know why it did it but it did. Oh well, at least I can future proof this thing moving forward.
 
Zuner said:
Sorry man, damn well hate it when crap like this happens, was supposed to be a joyus occasion getting a new GPU then something like this happens, I know the pain.
Click to expand...

Thankfully it's not the end of the world. All my work is on another drive and I have all my critical data in the cloud. Just a pain in the ass. Just planned to pop in my gfx card and run some benchmarks before work and ended up having to deal with this...
 
zolly said:
I think it was Windows trying to repair the drive after I changed the bios settings. Don't know why it did it but it did. Oh well, at least I can future proof this thing moving forward.
Click to expand...

There is a possibility that your boot key corrupted. Unable to tell.
 
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Per Gemini:

Disabling CSM (Compatibility Support Module) can cause an MBR (Master Boot Record) failure because CSM is needed for legacy BIOS boot, and disabling it requires a GPT (GUID Partition Table) partition scheme, which MBR doesn't support.

Here's a more detailed explanation:
  • CSM and Legacy Boot:
    CSM is a feature in UEFI (Unified Extensible Firmware Interface) that allows computers to boot from legacy BIOS (MBR) drives.

  • UEFI and GPT:
    Modern UEFI systems, especially those with Secure Boot enabled, typically require GPT drives for booting.

  • The Issue:
    If your system is set up to boot from an MBR drive and you disable CSM, the system might not be able to find a bootable device, leading to a boot failure.

  • Solutions:
    • Convert to GPT: If you want to disable CSM and enable Secure Boot, you'll need to convert your MBR drive to GPT.

    • Reinstall Windows: You can also reinstall Windows in GPT mode.

    • Re-enable CSM: If you need to boot from an MBR drive, you can re-enable CSM in the BIOS settings.
Troubleshooting Steps:
  1. 1. Check Partition Type:
    Use diskpart in Windows to check if your boot drive is MBR or GPT.

  2. 2. Convert to GPT (if needed):
    If your drive is MBR, you can use tools like mbr2gpt (from Microsoft) to convert it to GPT.

  3. 3. Reinstall Windows (if needed):
    If the conversion fails or you prefer a clean install, reinstall Windows in GPT mode.

  4. 4. Check Boot Order:
    Ensure your boot drive is selected as the first boot device in the BIOS/UEFI settings.

  5. 5. Update BIOS:
    Sometimes, an outdated BIOS can cause boot issues. Check for updates on your motherboard manufacturer's website.


Then check the few below out, seems to point out the same as ^ :

https://www.reddit.com/r/buildapc/comments/rqn3f4/cant_boot_into_windows_after_disabling_csm

[SOLVED] - Disabling CSM makes M.2 boot drive unavailable ?

Hello All, Operated this build for a couple of years before recently upgrading my gpu to the 6700xt, and was hoping to enable SAM. Updated the BIOS on my mobo successfully. In the BIOS I am able to enable both Above 4g and RBar support. As I understand it, I also need to disable CSM...
forums.tomshardware.com forums.tomshardware.com
 
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Thanks. Busy trying to do a new win11 install but don't know if the one I created got corrupted during the download with windows media creator. Got to 100% install a couple of times and then just got "windows failed to install". Am doing a new install drive with Rufus and will see what happens...

Pc is Gigabyte Aorus 550m, 5700x3d, 16 gigs of ram, new 9070, bios from 2024. It's this **** that reminds me why people get consoles.

Tested an Ubuntu OS flash drive I have lying around and it worked fine, so don't think it's a hardware issue.
 
Keep on getting Windows 11 installation failed after Windows 11 reaches 100% of the installation and tries to reboot.

No idea what is going on.
 
This has been one of the most painful experiences of my life. It turns out Windows 11 is extremely pissy when it comes to installation media and it also absolutely demands a completely clean os drive. Had to use diskpart to remove all of the data on both drives and then reinstall.

And now I'm stuck at the network page of the installation because this thing doesn't recognise my USB dongle for my wifi...
 
zolly said:
This has been one of the most painful experiences of my life. It turns out Windows 11 is extremely pissy when it comes to installation media and it also absolutely demands a completely clean os drive. Had to use diskpart to remove all of the data on both drives and then reinstall.

And now I'm stuck at the network page of the installation because this thing doesn't recognise my USB dongle for my wifi...
Click to expand...
Plug in a network cable?
 
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