By AOMEI / Last Updated August 22, 2019

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 data loss" in many technical blogs and forums. Why do they want to convert MBR to GPT? Why would them cannot afford data loss? The difference between MBR and GPT and personal situations offer the reasonable explanation.

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

  • The users can only create four 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 main boards 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 or format all partitions for converting.

Will converting to GPT delete data? Actually, the answer varies depends on which way you choose. Some tools do require you delete data, yet not all the tools are.

How to Convert MBR to GPT without Losing Data in Windows?

Therefore, is there any way to convert MBR to GPT with ensuring data security? Of course, YES! Next we will show you 3 different ways to complete the conversion. The first method is just the way on how to convert MBR hard disk to GPT without data loss.

Notice: If you’re running Windows 10 v1703 and higher, you may turn to Windows 10 MBR2GPT convert tool to convert system disk.

1. Convert System Disk from MBR to GPT with Professional Tool (Recommended)

Usually, system disk refers to the hard disk that contains your operating system. Windows built-in tools, Command Prompt and Disk Management, will not allow you to convert it between MBR and GPT under Windows environment.

Important: 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.

Therefore, the easiest way to convert MBR to GPT with data security ensured is to use a professional disk conversion tool like AOMEI Partition Assistant Professional Edition. It allows you to easily complete MBR to GPT conversion in Windows environment, while keeping all your data intact during the process.

The software supports both system disk and data disk, and is compatible with all Windows PCs such as Windows 10, Windows 7, Windows 8/XP/Vista. You may want to download its Demo edition to experience it.

Tips: The demo version only allows you to preview all functions and simulate all operations

  • How to easily convert MBR to GPT without data loss in Windows 10 step by step?

Note: It is suggested to backup important data before you start since data loss might be caused by inappropriate operations or other unexpected errors.

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

It is quite easy to change a disk that you don’t want to loss data from MBR to GPT with the help of AOMEI Partition Assistant. Above steps also apply to converting MBR to GPT without data loss in Windows 7.

However, to convert MBR to GPT without losing data on Server 2012 or other Servers like Server 2008 R2, you need to turn to AOMEI Partition Assistant Server edition, which designs for Server OS in particularly.

Another two ways on convert MBR to GPT are using Windows built-in utilities, Diskpart in CMD and Disk Management. Note that these two methods require deleting all partitions first. They are recommended to convert an empty MBR disk or data disks that contains less important data. Detailed guidance comes below.

2. Use Diskpart to convert 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. Please backup your important data before applying this method. The Diskpart Command can achieve the goal 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".

3. 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 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 converting MBR and GPT. 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.