Make sure the current disk is using MBR.

Here are the system requirements of the MBR2GPT utility: In addition, if the system partition is not active or your PC doesn’t meet the requirements of MBR2GPT, you may encounter the MBR2GPT conversion failed error as well.

The error often indicates that there is no BCD data found on the OS partition or BCD files get corrupted. When I run MBR2GPT /convert / allowFullOS it says cannot find OS partition.Īccording to user reports, the “MBR2GPT failed to find OS partition” error usually occurs after upgrading from Windows 10 to 11. MBR2GPT cannot find OS partition for Disk 1. However, this command is not always running properly and various errors can occur, such as “ failed to update ReAgent.xml”, “ MBR2GPT failed error”, and “MBR2GPT cannot find OS partition”. This tool can convert an MBR disk to GPT by running the “ mbr2gpt /convert /disk: n /allowfullOS” command in Command Prompt. It is a practical disk conversion utility of Windows Creator’s Update starting from Windbuild 15063. When it comes to converting MBR to GPT on Windows, most users may want to use the MBR2GPT tool. How to Fix MBR2GPT Cannot Find OS Partition Windows 10/11.This post of MiniTool introduces a better alternative to MBR2GPT conversion and provides corresponding fixes to the error. Many users encounter the MBR2GPT cannot find OS partition error when converting MBR to GPT on Windows 10/11.

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