By AOMEI / Last Updated March 22, 2021

Need to convert MBR to GPT without data loss

Nowadays, many Windows users search for a satisfactory answer to "how to convert MBR to GPT without losing data" in many technical blogs and forums. Why do they want to convert MBR to GPT? Why would they not afford data loss? The difference between MBR and GPT and personal situations offer a reasonable explanation.


▶The MBR hard disk can only support 2TB hard disk at most, but GPT can support 256TB.

▶The users can only create 4 primary partitions or three primary partitions and one extended partition on an MBR disk at most. The GPT can support 128 primary partitions at most.

▶Some booting mainboards cannot support MBR as their system drive, such as MAC.

Many users look for a way to convert MBR to GPT during or after Windows installation, which makes them cannot delete all partitions for conversion. Will converting MBR hard disk to GPT delete data? Actually, the answer varies depends on which way you choose. Some methods do require you to delete existing partition (of course, along with the inside data) before MBR to GPT conversion, yet not all the methods are.

Best way to convert MBR to GPT without data loss in Windows

It is well-known that Windows built-in Command Prompt and Disk Management can convert MBR to GPT only when you delete all partitions on the target disk; of course you will lose all data inside as well. Moreover, they cannot convert system disk between MBR and GPT under Windows environment since the system partition cannot be deleted within Windows. 

So is there a way to convert data disk or boot disk from MBR to GPT without losing data? Of course, YES! The best method should be employing a third-party MBR to GPT converter like AOMEI Partition Assistant Professional. It can help you easily convert both system disk and data disk from MBR to GPT within Windows as long as the OS can boot up successfully. Besides, it does not require you to delete partitions beforehand, so all your data will be safe. It works on all Windows PCs such as Windows 10, Windows 7, Windows 8/XP/Vista. You may want to download its Demo edition to experience it.

Try Demo Win 10/8.1/8/7/XP
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If you plan to convert the MBR system disk to GPT, please ensure the motherboard supports EFI/UEFI boot mode, otherwise, the system cannot boot successfully after conversion.
It is suggested to backup important data before you start since data loss might be caused by inappropriate operations or other unexpected errors.
③If you’re running Windows 10 v1703 and higher, you may turn to Windows 10 MBR2GPT convert tool to convert the system disk from MBR to GPT style.

Step 1. Install and launch the software, right click the MBR disk you want to change and then choose Convert to GPT Disk.

Convert Data Disk to GPT

Step 2. In the pop-up windows, click OK to continue.

OK to GPT Data Disk

Step 3. Click Apply to perform the operation and then your disk will be changed into GPT disk style.

Apply to GPT Data Disk

With the help of AOMEI Partition Assistant, it is quite easy to change a disk from MBR to GPT, or GPT to MBR without losing any data. To convert MBR to GPT without losing data on Server 2012/2016/2019, you need to turn to the AOMEI Partition Assistant Server, which designs for both Server and Windows OS.

Another Two Ways to Convert MBR Disk to GPT

The previous content is using a 3rd-party tool to complete MBR to GPT conversion without losing data. Next, we will also show you how to convert MBR to GPT using Windows built-in utilities: Diskpart in CMD and Disk Management. However, please note these 2 methods require deleting all partitions first. They are recommended to convert an empty MBR disk or data disks that contains less important data. To convert a disk with partitions on to MBR or GPT without losing data, you need to back up the required files in advance. And then check out the following detailed tutorial.

1. Use Diskpart to convert MBR disk to GPT

As one of the Windows built-in tools, Diskpart is a common choice for users to convert disk, or format disk partition. The Diskpart Command can help convert MBR to GPT by the following steps.

Step 1. Press Windows key + R key simultaneously, and input "diskpart" in the box. Press Enter.

Step 2. Input "list disk" to list all disks connected to your computer.

Step 3. Input “select disk n”(n is the number of MBR disk)to select the MBR disk you want to convert to GPT.

Step 4. Input "clean" to delete all partitions existing on the target disk.

Step 5. Input "convert gpt".

Convert Gpt Cmd Windows 10


Note: to use Command Prompt to convert system disk to MBR or GPT, you need to boot computer from the Windows installation media, and press Shift+F10 at the Windows Setup screen to bring out Command Prompt window, and then run the above commands to convert the boot disk.

2. Use Disk Management to Convert MBR to GPT

You can enter Disk Management by right click My Computer > Manage > Disk Management and use it to convert MBR to GPT. But same as Diskpart, it does not permit you to convert any MBR disk with partitions on. So you have to delete partitions first, otherwise you will find Convert to GPT Disk is grayed out.

Final Words

From the content above, it is easy to conclude that AOMEI Partition Assistant can convert MBR to GPT, or convert GPT to MBR without deleting partitions to ensure data security. But in Diskpart and Disk Management, removing partitions/volumes is a must step of the conversion. So AOMEI Partition Assistant offers the best way to convert MBR to GPT without data loss.

As a matter of fact, MBR and GPT have different merits and shortcomings under different situations. Just choose the right one based on your own situations.