How to Fix MBR2GPT Is Not Recognized Issue in Windows

You may receive a message that "MBR2GPT is not recognized" when you use MBR2GPT. This post will analyze why this issue happens, and help you how to fix it.


By Dervish / Updated on May 12, 2023

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MBR2GPT is not recognized

Hello, I’m working on a new Windows PC and I have been having an issue. I reinstall Windows 10 64-bit Home 1607 version, and I tried to use MBR2GPT to convert my disk to GPT partition style. But when I enter the command, it prompted an error saying, “mbr2gpt is not recognized as an internal or external command” just like the following screenshot."

- Question from

Mbr2gpt Is Not Recognized

Why MBR2GPT is not recognized?

MBR2GPT.exe is a command-line tool that is used to convert MBR (Master Boot Record) to GPT (GUID Partition Table) without data loss in WinPE Environment or administrative Command Prompt. To use this tool, you just enter Windows PE environment, and run Command Prompt, then run conversion with the command: mbr2gpt /convert /disk number/allowfullos.

However, some users don't know the fact that MBR2GT is supported in Windows 10 1703 version or newer versions running under windows \system32 directory. So the reason why MBR2GPT is not recognized is that Windows 10 is not concluded with Windows that older than 1703. Then we will help you solve the problem in the next partition.

How to solve “MBR2GPT is not recognized” issue in Windows 10

Since the cause is the Windows version, you can solve it by updating Windows 10. Just go “Settings” > “system” and update your Windows version. It will take some time to complete. If your Windows can’t update, or you don’t want to, we got another solution is to create a Windows PE (pre-installation) environment.

Windows PE is a small operating system that allows you to deploy MBR to GPT conversion without full Windows 10 1703. Firstly, download the Windows 10 1403 ADK or latest Windows version and insert a USB drive. And follow the steps below.

✍ Warning: Back up the USB drive if there are necessary data, it will be formatted during the process.

Step 1. Open ADK tool you just downloaded, and tick the “Install the Windows Assessment and Deployment Kit-Windows 10 to this computer” and click “Next”.

Step 2. Follow the prompts, it will be several next-and-next steps.

Step 3. Select “Deployment Tools” and “Windows Pre-installation Environment (Windows PE), and click “Install”.

Step 4. Once the installing is finished, close the window. Then click “Start” button > “Windows Kits”. Right-click on “Deployment and Imaging Tools Environment” and choose “More”, and hit “Run as administrator”.

Step 5. You will see a command-line window, execute the command: copype amd64 USB drive letter:\WinPEx64 to burn Windows PE to USB drive.

Step 6. Wait for the process to be completed. And make the USB drive bootable. Type and execute command makewinpemedia /iso USB letter:\winpex64 USB letter:\WinPEx64\WPE64.iso.

When the progress to reach 100% and see “success”. Then leave the window. Shutdown your computer, and boot from WinPE drive.

1. Tap BIOS key when you see the first screen during the booting process.

2. Enter BIOS setup, and choose “boot” tab, and enter “change boot order”.

Change Boot Order

3. And select the USB drive to boot up your computer.

Then you will enter Windows PE environment, and execute the MBR2GPT.exe again. You will not see mbr2gpt is not recognized or not found again.

Limitations of MBR2GPT converter

In addition, there are several limitations making the conversion failed with MBR2GPT. To use MBR2GPT, the disk has to have less than 4 partitions, which means you can create 3 partitions at most. Besides, the process is irrevocable, If you are not satisfied with GPT disk layout, this tool can’t convert it back to MBR.

Moreover, the command-line interface is complicated and error-prone for most users. Some of them have had "MBR2GPT cannot find OS partition" or “disk layout validation failed” error. Thus, when MBR2GPT conversion couldn't work, you can employ a MBR2GPT alternative to convert your disk.

Convert MBR to GPT with AOMEI Partition Assistant

Another solution we can deal with “MBR2GPT is not recognized” or other error is turn to the alternative tool-AOMEI Partition Assistant Professional (Support Windows 11, 10, 8, 7 any versions.), which is a user-friendly tool helping you to change system or non-system disk from MBR to GPT or from GPT to MBR without data loss. By the way, if you plan to upgrade Windows 10 to Windows 11, using it is the first choice. Not only it can convert MBR to GPT quickly, but also Window 11 detection tool are provided.

Moreover, it also supports creating Windows PE USB drive to handle unbootable computers. You can also create a WinPE USB firstly and convert disk without full system. You can download the demo version to see how it works beforehand.

Try Demo Win 11/10/8.1/8/7/XP
Secure Download

Step 1. To install and open this converter, you can view all connected disks on the main interface, and right-click on the MBR disk you want to change, and hit “Convert to GPT”.

Convert System Disk To Gpt

Step 2. Click “OK”. If the disk contains the OS, the program will tell you that GPT disk supports UEFI. Make sure the PC is use the correct boot mode. Otherwise, you need to convert legacy BIOS to UEFI firstly, and click “Yes”.

Step 3. At last, click “Apply” to commit the operation.

Apply To Gpt System Disk


This is how you can deal with “MBR2GPT is not recognized” in Windows. Creating a Windows PE USB drive is a solution for MBR2GPT failure because of Windows 10 version. Or you can use AOMEI Partition Assistant to convert MBR to GPT, which is an alternative tool for MBR2GPT. It makes up for various defects of MBR2GPT, and does not require complicated steps, just three steps to complete. By the way,  there are Server edition for you if want these operations in a Windows Server system. 

Dervish · Staff Editor
Dervish is an English editor of AOMEI Technology; He is delicated to offering users easy and effecitve solutions for issuses related to disks and partitoins. In his spare time, he enjoy wathcning films, playing footable, traveling and so on.