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Same issue as:MBR2GPT: Disk layout validation failed for disk 0

I've tried all of the solutions here. This is my diskpart and MBR2GPT log. This is my Disk management window. As you can see, I have less than 3 partitions, and have 16gb unallocated space for use.

Matt Griffin
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  • Please add a screenshot of the entire Disk Management window. – harrymc Nov 14 '21 at 19:02
  • https://i.stack.imgur.com/0Vans.png – Matt Griffin Nov 14 '21 at 19:09
  • Your problem is that you're booting from Disk 0, but trying to convert Disk 1. MBR2GPT will not work when the boot is split over two disks. You will need to do some dangerous partition work to correct the issue. Why is doing this conversion so important? – harrymc Nov 14 '21 at 19:18
  • I'm not booting from disk 0. Disk 1 is an SSD with my entire system on it. Disk 0 is a hard drive with miscellaneous files. I'm not sure why the names are mismatched, but that's definitely not the problem. – Matt Griffin Nov 14 '21 at 19:35
  • You're booting from the "System Reserved" partition on Disk 0, which directs the boot to Disk 1. This partition must be copied to Disk 1 and the BIOS to be set to boot from it, before the conversion. Do you wish to do these manipulations? But you haven't answered my question about why you're doing this. – harrymc Nov 14 '21 at 19:43
  • This was for Windows 11, but at this point I might just look into skipping Secure Boot. – Matt Griffin Nov 14 '21 at 19:47
  • That might be more prudent. The above manipulations are possible and documented, but partition work is risky. – harrymc Nov 14 '21 at 19:49
  • Alright, thanks for the help. – Matt Griffin Nov 14 '21 at 19:52
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    While you can disable TPM 2.0 and CPU checks with AllowUpgradesWithUnsupportedTPMOrCPU, but you will NOT be able to skip the GPT requirement. Windows 11 does not actually support MBR. At least not without modifying the ISO to support it. – Ramhound Nov 14 '21 at 23:40
  • This^^^So the best course of action is to start with a GPT drive. – ChanganAuto Nov 15 '21 at 09:52

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