By Cherry / Last Updated February 15, 2019

Why should you convert external hard drive to GPT disk?

The hard drive can be divided into MBR and GPT. The MBR is the abbreviation of master boot record, which starts the standard BIOS partition table, supports up to 2TB volume capacity. It only supports up to 4 primary partitions, which means if you want to create more partition for storing different files when it already has 4 primary partitions, you have to convert one primary partition to extended partition. While, the GPT, GUID partition table disk, uses unified extensible firmware interface (UEFI), supports disk more than 2TB, and you can have more than four primary partitions on GPT disk.

Why should you convert external hard drive to GPT? Many users want to have more partitions to store different files. Thus, they want to convert their external hard drive to GPT so that they can create partition more flexible. There is another situation that users have to convert the external hard drive to GPT. Sometimes, users may find that their 3TB or 4TB external hard drive only showed 2TB, users only convert it into GPT disk to make full use of the external hard drive.

Convert external hard drive to GPT with Disk Management

Figure out why you need convert external hard drive to GPT, you need to know how to do it. The Windows OS has built-in tool named Windows Disk Management. You can use it to convert your external hard drive to GPT.

Plug in the empty external hard drive and make sure it can be detected by the computer. Open theDisk Management. Right click the external hard drive, select “Convert to GPT Disk” and follow the hints to convert external hard drive to GPT.

Convert to GPT

Note: To change a master boot record disk into GUID partition table disk with the Windows Disk Management, you need back up or move the data on the external hard drive first. Because it can only convert an empty MBR disk to GPT, otherwise, you’re unable to convert disk to GPT using Windows tool.

Convert external hard drive to GPT without destroying any data by using AOMEI Partition Assistant

AOMEI Partition Assistant is a good software that can convert MBR to GPT without destroying any data. Even there are many data on the external hard drive, you can convert it to GPT, which breaks out the limitation of Windows built-in tool. You can follow the steps below.

Step1. Install and launch AOMEI Partition Assistant, you will see its main interface. Right click the removable disk and select “Convert to GPT Disk”.

Convert Disk To GPT

Step2. Then, it will pop out a window to ask whether you want to convert MBR to GPT disk, click OK.


Step3. It will back to the main interface, and the disk 2 has already been marked as GPT. Then, click Apply at the toolbar to submit the operation.

GPT Apply

After converting the external hard drive to GPT, you can also use this software to manage your hard drive, such as create partition, resize partition, delete partition, format partition, etc. You can even use it to move OS to new hard drive. If you only need the basic functions, you can download its free edition. The good news is that the AOMEI Partition Assistant also sutable for Windows server users. If you are a Windows Server users, the AOMEI Partition Assistant Server is sutable for you.