Why and How to Convert Boot Disk to GPT?

Learn to convert system boot disk to GPT with AOMEI Partition Assistant Pro, you can do it only with a few steps, and won’t cause data loss.


By Lucas / Updated on May 12, 2023

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Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10, and now Windows 11, Microsoft always brings us various kinds of surprises. With the upgrade of software, the hardware is also should be replaced by the new generation components, thus Windows 11 puts forward higher requirements for hardware. Before Windows XP, most motherboards don’t support UEFI. But Windows operating system after Windows XP started to support GPT disk. And now, if users wish to upgrade from Windows 10 to Windows 11, the "GPT disk + UEFI boot mode" becomes a necessary condition. What’s the relationship between them?

UEFI and GPT are two different things but they always appear together, which might be confusing for some users. Here we introduce briefly.

UEFI stands for Unified Extensible Firmware Interface, an upgrade of EFI. It is a specification that defines a software interface between platform firmware and the operating system. UEFI supports hard disks with either MBR or GPT partition tables. MBR, namely master boot record, is old-style but still used by many vendors.

GPT is a newer standard. Systems that support UEFI require that the boot partition must reside on a GPT disk. That's why UEFI and GPT are always mentioned together.

Why do some users choose to convert system disk from MBR to GPT? One reason is as we noted above. The second reason is that if you want to expand a partition that is more than 2TB (MBR only supports a maximum partition size of 2TB). GPT supports theoretically unlimited partitions. By contrast, MBR only supports 4 primary partitions per hard drive.


Above are the main two reasons. So if you think GPT is necessary for you, you can convert the system disk to GPT without hesitation like other users.

With only a few steps, you can convert MBR to GPT successfully without any data loss. AOMEI Partition Assistant Professional is a powerful disk manager for Windows 11/10/8/8.1/XP/Vista users. Converting boot disk from MBR to GPT might cause data loss during the progress in Diskpart and Disk Management, but, with this convenient tool, users can execute the conversion safely and quickly.

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Step 1. Install and run AOMEI Partition Assistant, and right-click the disk with the system, choose the "Convert to GPT" function or click the disk and choose "Convert to GPT" from the right column. 

Convert System Disk to GPT

Step 2. Click “OK” to confirm your operation.

Convert GPT ok to gpt system disk

Step 3. Click on “Apply” to commit the pending operation.


It’s really simple, only a few clicks! It keeps the system and data safe at the same time. AOMEI Partition Assistant is always known for being professional and efficient.

With this handy tool, you can easily and securely convert boot disk to GPT, or convert back to MBR.

If you need,  you can experience the amazing functions “Windows to go creator”, “rebuild MBR”, "Allocate free space", “migrate OS to SSD” etc, provided by AOMEI Partition Assistant.

What's more, we have the Server edition for Windows Server users, so all Windows users can trust AOMEI Partition Assistant to organize their devices simply like an expert. I hope you try and enjoy it yourself. Our website has lots of article tutorials and videos which will help you a lot.

Lucas · Staff Editor
I prefer peaceful and quiet life during vacation,but sometimes I watch football match if my favorite club performs brilliantly in that season. And I love reading, painting and calligraphy, thus I send my friends festival handwriting cards every year.