MBR2GPT Disk layout validation failed

macsrwe I too was running into MDR2GPT's "First partition too close to the beginning of the disk" error due to my first (System) partition being too close to the start of the drive.  The log file described above in this thread was *key* in identifying the problem.  I shrank the first partition (and others on the drive) and had ample unallocated space available but MBR2GPT still failed to validate the drive with the same error.

Ultimately I was unable to find a way to *move* the partition using built in tools, though there may be a way.  I threw in the towel and spent $65 on the MiniTool Partition Wizard app.  In the app I used the 'Align' feature on the offending partition.  It automatically adjusted the partition for me and MBR2GPT now successfully validated the drive for conversion.  It was worth the $65 IMO.

I found https://youtu.be/QiuFC7SQgY4?si=smysGyLoBR4sWy5J helpful in both explaining and solving the problem.  My only regret is that I was unable to fix it without the help of a 'for pay' app.  If anyone can educate me on such a solution please share!

I should also note that the MiniTool Partition Wizard required a subscription for this feature and was aggressive about setting up automatic annual renewals.  I used a virtual credit card to purchase the subscription which I can turn off (or delete) to avoid future charges since I only needed the tool one time.

Now off to enable UEFI/Secure Boot and finally upgrade to Windows 11 🙂