By AOMEI / Last Updated April 2, 2021

Both of MBR and GPT are the style of partition. For MBR disk, it only sustains four primary partitions and the size of a partition is 2TB. If you need to create more partitions, you can set the fourth partition as extended partition and then you are allowed to build more partitions or logical drives. However, GPT has unique identifies (GUID) to define the partition. With GPT, you can make unlimited partitions on the hard disk. This can help you take full advantage of the disk space.


MBR disks only support up to 2TB partition size and support only four primary partitions. This is the biggest cause that your 4TB hard drive only shows 2TB, the beyond size will cannot be read and displayed. However, GPT has no limitation for partition size and partition on GPT disk has built-in backup which is stored on the end of the disk while the original one is stored on the start. When one of the two is destroyed, you can restore it with the other. Besides, GPT allows unlimited number of partitions. With these advantages compared with MBR, most of users choose to convert SSD from MBR to GPT.

AOMEI Partition Assistant Professional is powerful disk partition management software. With the help of the software, you can convert MBR to GPT easily without deleting partitions. Besides, it has many other features which can be widely used in your work such as resize partition, merge partitions, allocate free space, windows to go creator and more. The following will show you the detail of how to convert MBR to GPT.

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Before you do: If you want to convert boot disk from MBR to GPT, make sure your motherboard supports UEFI.

Step1: Install and launch it. Select the SSD MBR disk you want to convert and right click it. Then choose Convert to GPT Disk.

Convert Data Disk to GPT

Step2: Click OK.

OK to GPT Data Disk

Step3: In order to save the change, click the Applybutton on the toolbar.

Apply to GPT Data Disk

Everyone knows that Disk Management a built-in tool in Windows can help you convert MBR to GPT. However, with this tool if you want to switch MBR to GPT when there are partitions on disk, you need to delete all partitions before conversion. It isn’t convenient for you. Therefore, AOMEI Partition Assistant is your good choice. Besides convert SSD MBR to GPT, it allows you to change primary partition to logical partition, convert FAT32 to NTFS, etc. And you can turn Server edition if your PC is running with Windows Server Edition.