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Castiellm's avatar
Castiellm
Iron Contributor
Dec 11, 2025

How to change or convert mbr to gpt without data loss?

I want to install Windows 11 on my Windows 10 PC, which has a MBR partition. When I tried to install Windows 11, the setup wizard tells me only GPT partition table is supported. The built in disk man...
Sundarpic's avatar
Sundarpic
Iron Contributor
Dec 11, 2025

Please use a dedicated partition manager and make a bootable media.

While many partition managers exist, using their bootable media (a disc or USB) to perform the conversion outside of the running Windows operating system can be considered an "unusual" approach compared to simply running the software in Windows or using MBR2GPT.exe.

Convert mbr to gpt without data loss

Step 1: Create a bootable media (USB or CD) using the third-party software.

Step 2: Boot your computer from this media.

Step 3: Run the MBR-to-GPT conversion function within the software's dedicated environment.

Step 4: Reboot and ensure your firmware is set to UEFI mode.

Most users prefer to use the Windows-native MBR to GPT converter (MBR2GPT.exe) for the OS disk, or the desktop application of a partition manager for a non-OS disk. Booting into a specialized pre-installation environment to perform the task is less common, but it can be necessary if the Windows OS is unstable or the standard tools fail.

 

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