I'm trying to enable Secure Boot for the BF6 beta but discovered that my PC is not using UEFI. I need to convert my drives from MBR to GPT to make that happen, but every time I try to convert, I get an error during validation. For instance, when I run 'mbr2gpt.exe /validate /allowfullos', it says it can't find the OS partition for both disk 0 and disk 1. Here's a link to what my disk management looks like: [disk management screenshot](https://imgur.com/a/PnMDOVa). Any ideas on what I can do?
3 Answers
You can check out this link for more information on the issue you're facing: [DiskPart Guide](https://www.diskpart.com/gpt-mbr/mbr2gpt-cannot-find-os-partition-7201.html). It might give you some insights on resolving the partition issues.
It sounds like you're in a tricky spot. Switching to UEFI after Windows is installed can cause issues; you might end up breaking your installation and will need to repair it, possibly needing a clean install. Before proceeding, if you have BitLocker enabled, make sure to disable it and let it decrypt your drive first. It might be simpler to just start fresh if you can.
Try using bcdboot.exe to fix your boot files first. It can help adjust things before you convert to GPT!
On which drive should I run bcdboot? I want to ensure my boot files stay on my SSD (C Drive).
Really? So there's no point in trying to convert? Do you have any guides for a fresh install on Windows 10 for someone in my situation? And does that BitLocker warning apply to the fresh install too?