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How to Convert MBR to GPT or GPT to MBR Without Losing Data in Windows 11/10

Updated by Tracy King on Oct 12, 2021

Both MBR and GPT are partition styles for your storage devices and each has its own advantages and disadvantages. Converting a disk from MBR to GPT or vice versa is needed when you want to utilize your disk in a more proper way based on the integrated features of the partitioning formats. 

4 Ways to Convert MBR to GPT or GPT to MBR Without Data Loss

You can learn four ways to convert MBR to GPT or GPT to MBR in this article. The first solution is the most recommended option. Even you have little technical know-how, you can convert to GPT without losing data.

How to Break the 2TB File System Limit of MBR in Windows 11/10/8.1/8/7

No matter whether you know MBR or GPT, you must have encountered such a situation. Your disk has 4TB of space, but you can only use 2TB of space, and the remaining 2TB seems to be wasted. Why does a 4TB hard drive only show 2TB? This is because your disk is MBR.

MBR only supports up to 2TB volume size and 4GB file size. Unlike MBR disk, GPT disk doesn't have such limitations. You can know their difference in this table.

Comparison MBR GPT
Maximum Partition Size 2TB 9.4ZB (1ZB=1billion TB)
Maximum Partition Number 4 primary partitions or three primary partitions and one extended partition 128 primary partitions
Firmware Interface Support BIOS UEFI

Therefore, if you want to break those limits on an MBR disk or if you have vital files on your disk and worry about data loss, you'd better convert MBR to GPT.

Tip 1. Convert MBR to GPT Without Data Loss in Windows 11/10/8.1/8/7

The partition tool - EaseUS Partition Master perfectly meets your demands of changing MBR to GPT without data loss. Whether you want to convert MBR to GPT or convert GPT to MBR, you can apply this software to get it done without deleting the volumes on your disk.

- EaseUS Partition Master -

Your Smart Windows 11 Update Disk Manager

  • MBR to GPT Converter, Make Disk Ready for Windows 11.
  • Migrate Windows 11 to New SSD in 1-Click.
  • Handy to Extend or Combine Partitions in Windows 11.
  • Clone and Upgrade Disks without Data Loss.
Free DownloadWindows 11/10/8/7

Whether you're a computer novice or an expert, you can easily apply this tool to simply change MBR to GPT without losing any data in Windows 11/10/8/7 now. To convert GPT to MBR vice versa, check the specific tutorial. 

Step 1. Download and launch EaseUS Partition Master on your Windows computer.

Step 2. Right-click the MBR disk that you want to convert and choose "Convert to GPT".

convert MBR to GPT - 1

Step 3. After that, find and click the "Execute 1 Operation" button on the toolbar and choose "Apply" to start the conversion.

convert MBR to GPT - 2

Important: There is one thing you need to pay attention to. If the disk you want to convert is the system disk, make sure the motherboard of the computer supports the boot mode of the target partition style. Remember that MBR supports BIOS and GPT supports UEFI.

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Tip 2. Convert MBR to GPT Using DiskPart Tool

You can convert MBR to GPT in CMD with the Diskpart tool. But you need to know that Diskpart will delete all files and folders from your hard drive when changing disk to GPT.

So we strongly recommend you back up your files in advance and then perform data restoring after the conversion. If there are lots of files on your disk, you are recommended to back up your data effectively using the free backup software - EaseUS Todo Backup. 

After backing up the files, follow the steps below to use Diskpart in CMD to convert MBR to GPT.

Step 1. Type CMD in the Search box. Right-click Command Prompt and choose "Run as administrator". If CMD isn't available, you can use PowerShell instead.

Step 2. Open Command Prompt, type DiskPart, and press Enter.

Step 3. Type list disk and press Enter. (Note down the number of the disk you which you want to convert to GPT)

Step 4. Type select disk X. (Replace the X with the correct number of your hard drive)

Step 5. Now type clean and press Enter. This command will remove all the files and partitions from your hard drive, so back up all important files in advance.

Step 6. Type convert gpt and press Enter.

This method is not suitable for computer beginners. If you mistakenly cleaned a partition using DiskPart, you can undo DiskPart clean to retrieve your files.

related articles

How to Install Windows 10 on GPT Partition?

Can't install Windows 11/10 on GPT partition? This page shows you how to install Windows 11/10 on the GPT partition successfully in the easiest way.

How to Install Windows 10 on GPT Partition

Tip 3. Convert MBR to GPT Disk with Disk Management

Similar to using CMD, you also need to delete all partitions on your disk using Disk Management. Before you convert the disk from MBR to GPT or from GPT to MBR, you should back up your disk. If you want to recover a deleted partition, you can use a partition recovery software tool to get your lost data and partition back.

Step 1. Right-click on "This PC", choose "Manage", then head to "Disk Management".

Step 2. Right-click the volumes on your target disk and choose "Delete Volume..."

Step 3. When your disk becomes empty (shows as unallocated space), right-click your disk and choose "Convert to GPT Disk".

Convert MBR to GPT in Disk Management

Tip 4. Convert MBR to GPT Without Losing Data with MBR2GPT 

MBR2GPT.exe is a Windows built-in tool used to convert the disk from MBR to GPT. The advantage of this tool is that it won't destroy the files on your disk during the conversion.

But that's not recommended since it's complicated to use and you may encounter various problems according to the feedback from other users. Besides, it's only available in Windows 10 version 1730 and later.

Run MBR2GPT in WinPE to Convert MBR to GPT CMD

Step 1. Click the Start button > click the Power button > hold the Shift Key and click Restart to access the Advanced Startup screen.

Step 2. Navigate to "Troubleshoot > Advanced options > Command Prompt".

Step 3. In Command Prompt, input these commands orderly, and press Enter after each command line.

  • mbr2gpt /validate
  • mbr2gpt /convert

convert mbr to gpt without data loss using mbr2gpt

After running these commands, your disk will be converted from MBR to GPT without data loss.

Run MBR2GPT in Full Windows OS to Convert MBR to GPT

MBR2GP tool is designed to be run in a Windows Preinstallation Environment (Windows PE) environment command prompt, but can also be run from the full Windows 10 operating system (OS) by using the /allowFullOS option.

Step 1. Run Command Prompt (Admin) on your Windows 10.

Step 2. Type command lines below and press enter after each one.

  • mbr2gpt /validate /allowFullOS
  • mbr2gpt /convert /allowFullOS

You can check the details of MBR2GPT.EXE in the related Microsoft documents.

How to Enable UEFI Mode After Converting System Boot Disk to GPT

If you have converted a system disk (MBR) to GPT, you need to enable the UEFI boot mode on your computer to make the OS bootable. Here are the steps:

Step 1. Restart PC and press F2, F8, F12, Del to enter the BIOS boot menu.

Step 2. Locate the "Boot" options menu and enable the UEFI mode.

  • Set Launch CSM to Enabled.
  • Set Boot Device Control to UEFI Only
  • Set Boot from Storage Devices to UEFI driver first

Step 3. Set the UEFI OS Boot option at the top of the Boot Priority List.

Step 4. Save the changes and exit BIOS, reboot PC from the GPT disk

how to boot from GPT disk after conversion

After this, wait patiently. Your computer will automatically boot from the GPT disk

The Bottom Line

After reading this guide, you will find that using EaseUS Partition Master is the easiest way to convert MBR to GPT without data loss among the four solutions. With this tool, you can convert MBR to GPT or convert GPT to MBR directly without deleting any partition.

If you prefer using Disk Management or DiskPart to convert MBR to GPT, remember to back up your disk in advance. While if you attempt to use MBR2GPT.exe, make sure your disk meets the requirements given by Microsoft, or the conversion will not proceed and an error will occur.

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Updated by Tracy King

Tracy joined in EaseUS in 2013 and has been working with EaseUS content team for over 7 years. Being enthusiastic in computing and technology, she writes tech how-to articles and share technical solutions about Windows & Mac data recovery, file/system backup and recovery, partition management and iOS/Android data recovery.

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  • I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes. I also think the overall look and feel of EaseUS Partition Master Free makes whatever you're doing with your computer's partitions easy.

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  • Partition Master Free can Resize, Move, Merge, Migrate, and Copy disks or partitions; convert to local, change label, defragment, check and explore partition; and much more. A premium upgrade adds free tech support and the ability to resize dynamic volumes.

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  • It won't hot image your drives or align them, but since it's coupled with a partition manager, it allows you do perform many tasks at once, instead of just cloning drives. You can move partitions around, resize them, defragment, and more, along with the other tools you'd expect from a cloning tool.

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