Convert MBR to GPT/GPT to MBR Without Losing Data in Windows 10

Tracy King updated on Nov 18, 2019 to Partition Manager | How-to Articles

"Hi there, do you know how can I change MBR to GPT without losing data in my Windows 10 computer? I got a second disk for extending storage capacity in my computer and I'm trying to convert it from MBR to GPT so that I can create more partitions for storing files and data. Here is the issue that I've already saved some files inside the drive and will I lose my data while converting MBR to GPT?"

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. Before introducing the ways to interconvert MBR, I'd like to share some features of these two partition styles with you.

MBR vs GPT

Comparison MBR GPT
Storage Space MBR supports maximum usable storage of 2TB GPT supports any storage that is available (be it smaller or larger than 2TB)
Number of partitions On an MBR disk, you can create a maximum of four primary partitions Theoretically, you can create unlimited partitions on a GPT disk.
Data Security MBR stores partitioning and boot data in one place. Once the data is corrupted, you have no chance to retrieve it GPT stores multiple copies of the partition information across the disk. If the data is corrupted, you still have the chance to get it back.
Supported Boot Mode The MBR disks use legacy BIOS boot mode GPT disks use UEFI (Unified Extensible Firmware Interface) boot mode

According to the information above, you may want to convert an MBR disk to GPT or a GPT disk to MBR. Generally, there are three ways to do it.

4 Ways to Convert MBR to GPT or GPT to MBR

  • Third-party software
  • Disk Management
  • DiskPart commands
  • MBR2GPT.exe

You can either use the Windows build-in tools or third-partition software to convert a disk between MBR and GPT. The difference is that:

If you change MBR to GPT or vice versa using Disk Management or DiskPart, you need to delete all the partitions on the disk in advance. If you use third-party software, you can directly interconvert MBR to GPT without any data loss. Although MBRTOGPT.exe don't need you to delete your partition, these two methods are much more complicated.

Thus, if you are looking for an easy way to convert MBR to GPT (or vice versa) without data loss in Windows 10, you are recommended to use a reliable tool that helps to finish the conversion without deleting the partitions on your disk.

How to Convert MBR to GPT or GPT to MBR Without Data Loss in Windows 10

As mentioned, there are three ways for you to convert a disk between MBR and GPT.

Method 1. Convert MBR to GPT Without Data Loss in Windows 10 Using Third-Party Software

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.

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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 Windows 10 is supported

You can directly apply this tool to simply change MBR to GPT or GPT to MBR without losing any data in Windows 10/8/7 now:

 

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

open EaseUS Partition Master

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

convert MBR to GPT

Step 3: After that, find and click the "Execute 1 Operation" button on the toolbar and choose "Apply" to start the conversion. You need to restart your device to enable this change. 

convert MBR to GPT

Method 2. Convert MBR to GPT Using DiskPart

If you want to convert MBR to GPT without data loss via CMD, you need to 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 and delete all the partitions on the disk, you can now follow the steps below to convert your disk using CMD.

Step 1. Open Command Prompt and type in DiskPart and press "Enter".

Step 2. Then type in list disk (Note down the number of the disk you which you want to convert to GPT).

Step 3. Then type in select disk X (the number of the disk).

Step 4. Finally, type in convert gpt.

If you mistakenly cleaned a partition using DiskPart, you can undo DiskPart clean to retrieve your files.

Method 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 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

Method 4. Convert MBR to GPT Without Losing Data Using Gptgen.exe

MBR2GPT.exe is a Windows built-in tool used to convert hard drives from the MBR partitioning method to GPT. The advantage of this tool is that it won't destroy the files on your disk during the conversion. However, it much more complicated than the three common methods above and it's only available in Windows 10 version 1730 and later. You can follow the steps below to convert MBR to GPT in Windows:

There are requirements for the disk in order to run MBR2GPT successfully. You can check the details in the related Microsoft documents (https://docs.microsoft.com/en-us/windows/deployment/mbr-to-gpt) and then apply the syntax below to convert your MBR to GPT.

Click to copy

For your information:

  • You can check the "disknumber" via the "select disk" command in diskpart.exe
  • If "/logs:<logDirectory>" is not specified, "%windir%" is used. You should specify an existing directory.
  • "/map:<source>=<destination>" specifies extra partition type mappings between MBR and GPT.
  • "/allowFullOS" is required if you are running MBR2GTP.exe in a full Windows environment instead of Windows PE.

The Bottom Line

As you can see, using EaseUS Partition Master if the easiest way to convert MBR to GPT without data loss among the four solutions. If you prefer using Disk Management or DiskPart, remember to backup 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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Frequently Asked Questions

Why Choose EaseUS Partition Master?

"I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions."PCWorld

"Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available."TECH ADVISOR

"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."Lifewire

Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

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