Windows 10: mbr2gpt broke winupdate?

With my new Ryzen 7 5800x and my RTX 3080 i wanted to make use of the "ResizeBAR support" feature.

Only works with CSM disabled tho and i didnt want to make a new install.

i used mbr2gpt from "safe/advanced boot" console

check came clear

convert gave this (which i saw later due to missing stuff from 1903 and up)

C:\WINDOWS\system32> MBR2GPT.EXE /convert MBR2GPT will now attempt to convert the default book disk. If conversion is successful the disk can only be booted in GPT mode. These changes cannot be undone! MBR2GPT: Attempting to convert disk 0 MBR2GPT: Retrieving layout of disk MBR2GPT: Validating layout, disk sector size is: 512 bytes MBR2GPT: Trying to shrink the OS partition MBR2GPT: Creating the EFI system partition MBR2GPT: Installing the new boot files MBR2GPT: Performing the layout conversion MBR2GPT: Migrating default boot entry MBR2GPT: Adding recovery boot entry MBR2GPT: Fixing drive letter mapping MBR2GPT: Conversion completed successfully Call WinReReapir to repair WinRE MBR2GPT: Failed to update ReAgent.xml, please try to manually disable and enable WinRE. MBR2GPT: Before the new system can boot properly you need to switch the firmware to boot to UEFI mode!

https://preview.redd.it/8e3cse8arza...bp&s=f3704df166d5ad92521f4271a067ede8a446bd37

ResizeBAR support works, but i noticed win update throwing errors.

gives me Errorcode: (0x8007000d) trying to install kb4598242

manual install (standalone installer from Microsoft Update catalog) of "kb4598242" also dosnt work



edit: also the system-reserved partition shows up now in the explorer instead of being hidden

edit2: im on Win10 Pro, 10.019042 Build 19042



Im all clear on

Dism /Online /Cleanup-Image /CheckHealth Dism /Online /Cleanup-Image /ScanHealth Dism /Online /Cleanup-Image /RestoreHealth sfc /scannow
submitted by /u/AntiTeammate
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:)

 

mbr2gpt

MBR2GPT: Attempting to convert disk 0
MBR2GPT: Retrieving layout of disk
MBR2GPT: Validating layout, disk sector size is: 512 bytes
Disk layout validation failed for disk 0

 

MBR2GPT

Thanks for your feedback Andre.

The link below contains a video I was using to try and convert my MBR to GPT on my system drive..

https://docs.microsoft.com/en-us/windows/deployment/mbr-to-gpt

The video explains that the methods used in your suggestion will destroy data and that is why the new utility MBR2GPT is the recommended solution. Since this utility is new with the latest Fall Creators Update, it may need updating. I hope someone has more
experience with it and can shed some light on why it fails for me.

 

mbr2gpt

Your computer is already booting in UEFI mode which means the drive is probably already in GPT format. What makes you think it isn't?

What does diskpart, list disk show?