By Cherry / Last Updated June 23, 2021


Hello, recently, I got a GPT SSD, and I want to transfer OS from MBR disk to GPT SSD. Is that possible? Could I need to convert GPT disk to MBR disk before transferring? Is there any way that I can use to migrate OS MBR to GPT without changing partition style?”

Why do you want to migrate OS MBR to GPT?

Master boot record (MBR) disks use the standard BIOS partition table. GUID partition table (GPT) disks use unified extensible firmware interface (UEFI). Besides, there are many other differences between MBR and GPT disk:

  • MBR disk allows you to create up to 4 primary partitions. If you need more partitions, you can only change one primary partition to extended partition, then, create logical partitions on the extended partition. While you can have more than 4 primary partitions on GPT disks.

  • MBR disk can only support up to 2 terabytes disk. That is why many people’s 4 TB hard drive only shows 2 TB. However, GPT disk supports more than 2 TB disk.

Because of GPT disk has more advantages compared with MBR disk, many users would prefer GPT disk than MBR disk. On the other hand, SSD has many advantages over HDD - It is more stable, and it has better performance while working. Thus, part of users would prefer to migrate OS from MBR disk to GPT SSD.

How to migrate OS from MBR disk to GPT SSD?

You may also have the problem “Is there any way to move OS from MBR disk to GPT SSD?” like the Scenario. Here, you can learn the way to migrate OS from MBR disk to GPT SSD without changing partition style.

To migrate MBR OS to GPT SSD without changing partition style, you need to use third-party software. Considering the functions and price, AOMEI Partition Assistant Professional should be the high cost-effective one. What’s important, it can directly transfer MBR OS to GPT disk and it will create an EFI partition and MSR partition so that the cloned GPT disk becomes bootable after the migration. Here are some tips for you:

  • You need to make sure that your target GPT SSD should be bigger enough or at least with the equal size to your MBR disk;

  • Make sure the target GPT disk is empty with no partitions and data on it, otherwise, you need to delete all partitions on it;

  • Make sure your motherboard supports EFI or UEFI boot.

Step by step guide of migrating OS MBR to GPT SSD:

Step 1. Connect the SSD to your computer. Install and run AOMEI Partition Assistant Professional. Click Migrate OS to SSD in the left pane and click Next.

Migrate from MBR to GPT

Step 2.Then, you need to select a partition or unallocated space on the destination disk. Here is the GPT SSD you connected to your computer before. Click Next.

Select Disk

Note: if you select a partition, all data on the partition will be deleted, and you’d better copy partition before.

Step 3. Here, you could modify the size, location, drive letter of the partition on new disk. Click Next.

Resize Partition

Step 4. You will move to the page where gives you a note on how to boot OS from SSD or HDD. Read it and remember it, click Finish.

Step 5. Finally, you will back to the main interface of AOMEI Partition Assistant. You can preview the operations in “Pending Operations”. If there is no problem, click Apply to submit all.



  • The proceed will be finished under PreOS Mode.

  • After migrating OS from MBR disk to GPT SSD, please enter BIOS and change boot setting to boot your computer from the GPT SSD.


AOMEI Partition Assistant Professional is  a great partition manager for Windows 10/8/7/Vista/XP. You can use it to migrate OS from MBR disk to GPT SSD without changing partition style. And you can use it to align SSD after migrate MBR OS to GPT SSD. Besides, if you only need to convert between MBR and GPT disk, AOMEI Partition Assistant allows you to convert MBR GPT disk without losing data. What’s more, the AOMEI Partition Assistant Server is designed for Windows Server OS. It should be the best service for Windows users.