By Cherry / Last Updated September 12, 2019

MBR to GPT in Windows 10

MBR and GPT are two different disk types. Sometimes, you need to convert MBR disk to GPT disk.

  • If you need more primary partitions on the hard drive while your hard drive is MBR partition style, you should convert MBR to GPT disk because the MBR disk supports up to 4 primary partitions while GPT disk has no limitations.

  • You may meet some problems like cannot fully use 3TB hard drive which may because of the MBR disk supports up to 2TB capacity. If you need fully use the 3TB or larger hard drive, you need to convert MBR disk to GPT.

Besides, there are many other reasons for users to convert MBR to GPT in Windows 10. However, the question is how to convert MBR to GPT in Windows 10?

MBR2GPT Tool Windows 10

Windows 10 v1703 and later versions built-in MBR2GPT tool, which converts an MBR disk to a GPT disk without modifying or deleting data on the disk. MBR2GPT.EXE is located in the Windows\System32 directory on a computer running Windows 10 version 1703 or later. It is designed to be run from a Windows Preinstallation Environment (Windows PE) command prompt, but can also be run from Windows 10 operation system by using the /allowFullOS option.

With the MBR2GPT tool, you can convert any attached MBR-formatted system disk to the GPT partition format. You can also convert operating system disks that have earlier versions of Windows 10 installed, such as 1507, 1511 and 1607 by running MBR2GPT while booted into Windows 10 version 1703 or later, and perform an offline conversion.

How to convert MBR disk to GPT with the MBR2GPT disk conversion tool?

To convert MBR system disk to GPT disk with MBR2GPT tool windows 10, here you can follow the command lines in different situations.

If you are working under Windows PE, type: mbr2gpt /convert /disk:n

If you are working in the full OS environment, type: mbr2gpt /convert /disk:n /allowfullOS

MBR2GPT

Note:

  • You need to ensure that your computer supports UEFI before converting the OS disk to GPT;

  • After the MBR OS disk has been converted to GPT partition style, you need to reconfigure the firmware to boot in UEFI mode.

With the MBR2GPT tool Windows 10, you can safely and non-destructively convert a Windows 10 computer from legacy BIOS to UEFI disk partitioning (you cannot use the MBR2GPT tool in Windows 10 to convert non-system disks from MBR to GPT). You can also convert OS disks that have earlier versions of Windows 10 installed, but you must run the tool while booted into Windows 10 version 1703 or later, and perform an offline conversion. However, offline conversion of system disks with earlier versions of Windows installed like Windows 7 or Windows 8/8.1 are not officially supported. Thus, you must upgrade the operating system to Windows 10 first so that you can perform the MBR to GPT conversion with MBR2GPT tool. Besides, you may meet the problem "disk layout validation failed for disk 0":

Disk Layout

Or the problem that "MBR2GPT.EXE has stopped working":

MBR2GPT Stop Working

When you meet those MBR2GPT errors and do not know how to do it, you can change to another third party software to convert MBR disk to GPT.

Alternative to MBR2GPT tool Windows 10

Speaking of a great MBR to GPT conversion tool, the AOMEI Partition Assistant should be the best choice. It should be a good alternative to MBR2GPT tool Windows 10 that can help you convert MBR disk (both system disk and non-system disk) to GPT without modifying and deleting data on the disk. What’s more, no matter Windows 10, or Windows 7, Windows 8/8.1, it can be used normally.

To use AOMEI Partition Assistant to convert MBR system disk to GPT, you need to make sure if your computer’s motherboard supports UEFI mode. Then, you can start to do it as the following guide.

Step1. Install and launch AOMEI Partition Assistant. Right click the hard drive you need to convert to GPT. Select Convert to GPT Disk.

Convert System Disk To Gpt

Step2. Then, confirm the operation. Click OK.

Ok To Gpt System Disk

Step3. Then, you will back to the main interface, click Apply to submit.

Apply To Gpt System Disk

Wait till the progress finished. And you have already converted the MBR OS disk to GPT disk without losing data.

Conclusion

AOMEI Partition Assistant is the greatest MBR to GPT disk conversion tool that can totally replace MBR2GPT tool Windows 10. Besides converting MBR to GPT, you can also use it to convert GPT to MBR disk without losing data no matter it is OS disk or not. It is not just a conversion tool between MBR and GPT, but also a great partition manager that can help you manage your hard drive in the best status, like repartition hard drive in Windows, resize partition, wipe hard drive, secure erase SSD, etc. It is worth to use.