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Convert MBR to GPT with MBR2GPT Tool in Windows 10 V1703

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As is well known, you know MBR and GPT are two different disk styles. On an MBR disk, you can create at most four primary partitions or three primary partitions plus one extended partition. If you want to create many primary partitions for different types' data, to use a GPT disk is a good choice. Then, you need to convert MBR to GPT. If you are using Windows 10 OS after v1703, MBR2GPT.exe will be your choice. Here we will show you this disk conversion tool in detail.

MBR2GPT Tool Windows 10

When referring to this tool, many of you probably are not familiar. Simply speaking, it is also known as Windows Creator's Update, starting in Windows 10 version 1703 build 15063. MBR2GPT.exe is a command line tool which is located in the System32 folder. With it, you can effectively and non-destructively convert a Windows 10 OS disk from MBR (for Legacy BIOS) to GPT partition style (for UEFI) without modifying/deleting any data on the disk or making a clean installation of Windows 10. You can run this tool by entering Windows Preinstallation Environment (Windows PE), as well as the full Windows 10 operating system (OS).

If your MBR OS disk contains BitLocker-encrypted volumes, MBR2GPT.exe is still useful to convert the disk to GPT as long as protection has been suspended. You are allowed to use this tool to convert OS disks running the earlier versions of Windows 10, including version 1507, 1511, and 1607, on condition that you must run the tool from Windows 10 v1703 or later and then perform an offline conversion.

How to convert MBR to GPT with MBR2GPT?

Since MBR to GPT disk conversion program is available in both Windows PE and the full OS environment, the command line is different.

In WinPE, type "mbr2gpt /convert /disk: n"
In Windows 10, type "mbr2gpt /convert /disk: n /allowfullOS"
N means the disk number.

See a figure as follows:

mbr2gpt

Attentions

  • Before attempting to convert the disk from MBR to GPT, please ensure your computer supports UEFI boot.
  • After converting OS disk to GPT, please reconfigure the firmware to boot to UEFI mode instead of Legacy BIOS.

For more information about this conversion tool, please watch this video:

Convert MBR to GPT with MiniTool Partition Wizard

Perhaps some of you don't use Windows 10 v1703 but run Windows 7,8,8.1. Then you are wondering: can MBR2GPT.exe be used to perform the conversion from MBR to GPT? The answer is no.

note Note: MBR2GPT tool firstly appears in Windows 10 v1703, therefore, it can't be used in the earlier versions of Windows, such as Win7/8/8.1. In this case, if you need to convert your disk to GPT, you can ask the third-party program – MiniTool Partition Wizard for help.

What's more, MBR2GPT conversion is possible to fail, showing some errors such as cannot find OS partition and disk layout validation for disk 0. Therefore, in order to finish the conversion from legacy BIOS (MBR) to UEFI (GPT), you can also use MiniTool Partition Wizard which is available in Windows 10/8.1/8/7 and Windows Server 2016/2012/2008.

This partition manager has six editions and each edition has different features. If you need to convert an OS disk from MBR to GPT, its Professional Edition or a more advanced edition is suitable. For a data disk conversion, the Free Edition is available. Click to learn edition comparison.

Before you do:
1. Please make sure your motherboard supports UEFI boot.
2. You had better make a system backup with MiniTool ShadowMaker for system restore on the event of some accidents.
3. We advise you to create a bootable disc with "Bootable Media" of MiniTool Partition Wizard in case of any accidents after the conversion.

Step 1: In the main interface of MiniTool Partition Wizard, right click on the system disk and then choose "Convert MBR Disk to GPT Disk".

minitool

Step 2: Click "Apply" to execute this conversion. To boot from the GPT disk, you need to enable UEFI mode in BIOS.

Conclusion

In this post, we introduce you MBR2GPT.exe in detail and show you how to convert MBR to GPT with this tool in Windows 10 v1703. Since the earlier versions of Windows including Windows 8.1/8/7 don't support this tool, you can use MiniTool Partition Wizard Professional Edition to perform the conversion well. If you have a need to convert your system disk to GPT partition style, just get MiniTool Partition Wizard Professional Edition.