How to Partition 4TB Hard Drive on Windows 11,10, 8, 7

Here, we will introduce reliable ways to partition 4TB hard drive in Windows. If you cannot partition the 4TB hard drive more than 2TB or find the 4TB hard drive only shows 2TB, you can figure them out.


By Cherry / Updated on March 7, 2024

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Help! Cannot partition 4TB hard drive



Hi, I can not partition more than 2 TB on 4 TB hard drive. I was trying to install the drive into a new PC, and I know Windows can’t be installed on a partition of more than 2TB, so I specifically installed a 140 GB drive just for the OS. I was planning on using the 4TB drive for storage only. But I still can only create a 2TB partition on the 4TB drive! It won’t allow me to partition the rest of the unused space.”


Partition 4tb hard drive

Why cannot partition more than 2TB on 4TB hard drive?

As the scenario said, the user can’t partition more than 2TB on her 4TB hard drive. This isn’t an unusual scenario; many Windows users have encountered the same problem when upgrading their PCs. If you want to partition a 4 TB hard drive, then you need to understand the basic requirements of hard drives on Windows.

Regardless of what Windows operating system you are using, you should know that there are two kinds of partition table on hard drives: Master boot record (MBR) and GUID partition table (GPT). MBR uses the standard BIOS, and supports drives up to 2TB in capacity. GPT uses UEFI (unified extensible firmware interface) which can support disks larger than 2TB. So, if you find that you can’t partition a 4TB hard drive, it could be because it is an MBR drive. If it is an MBR disk, then you can solve the problem by converting the drive from MBR to GPT.

Best way to partition 4TB hard drive on Windows 11, 10, 8, 7

We already know that the MBR can only support disks up to 2TB in size, any extra space beyond this will simply be invalid and will show as unallocated space. Although, you can normally partition unallocated space, you will find that the ‘New Simple Volume’ option is greyed out, and you won’t be able to create a partition. Once you have checked to see whether your motherboard is UEFI compatible, you can proceed to converting your MBR disk to GPT and solve the 2TB limit problem.

Unfortunately, like with the ‘New Simple Volume’ function, Windows Disk Management will also gray out ‘Convert to GPT Disk’. That's because the MBR contains some partitions, but Disk Management can only convert an empty disk to GPT or MBR. Namely, you need to delete all partitions before conversion.

Can't Convert to GPT

In order to convert an MBR disk to a GPT disk without losing any data or partitions, we highly recommend that you use AOMEI Partition Assistant Standard to convert the disk. AOMEI Partition Assistant is a professional disk manager that you can use to convert any disk between MBR and GPT in a few simple clicks without damaging data.

Please download the freeware to see how to partition 4TB hard drive on Windows 11, 10, 8, 7.

Download Freeware Win 11/10/8.1/8/7/XP
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1. If you preferred to convert a system disk (a disk containing the OS) to a GPT disk, then you can upgrade to AOMEI Partition Assistant Professional, which supports converting system disk between MBR and GPT.
2. Before converting a boot disk from MBR to GPT, then you need to make sure that your computers' motherboard supports UEFI mode. Otherwise, the computer won’t boot up after the hard drive conversion has finished.

Step 1. After opening it. The basic information of hard drive will be displayed in the main interface. You will be able to see that the 4TB drive shows a 2TB partition and 2TB of unallocated space. In order to convert the drive from MBR to GPT, you need to right-click the MBR disk, select “Convert to GPT”.

Convert 4TB to GPT

Step 2. A window will pop up asking you to confirm whether you want to convert the MBR disk to a GPT disk. Click OK, and you will be brought to the main interface.


Step 3. Here you can see that disk 2 has been marked as a GPT drive. In order to confirm this change, click Apply, and wait for the conversion to finish.

4tb Apply

More frequently asked questions about partition 4TB hard drive

Q: Why should I partition my 4TB hard drive?

A: Partitioning allows you to separate your data for various purposes. For example, you can have one partition for the operating system, one for personal files, and another for backups. It also helps with performance and can provide some level of data protection.

Q: What is the maximum number of partitions I can create on a 4TB hard drive?

A: The number of partitions you can create depends on the file system and the partitioning scheme you use. With a GPT (GUID Partition Table) scheme, which is recommended for drives larger than 2TB, you can create up to 128 partitions.

Q: Can I partition a 4TB drive if it already has data on it?

A: Yes, you can partition a drive that already has data. However, when you create a new partition, it will need to take up some space from the existing data. Always back up important data before partitioning.

Q: What file system should I use for a 4TB hard drive?

A: For a 4TB hard drive, it's recommended to use the NTFS file system if you're primarily using Windows. If you plan to use it with macOS, you might consider using APFS. If you need compatibility across different operating systems, exFAT is a good choice.

Wrap things up

Finally, the MBR disk will have been converted to a GPT disk, and you will be able to partition 4TB hard drive. If you plan to do this in Windows Server, you should switch to AOMEI Partition Assistant Server, which is designed for Windows Server 2022/2019/2016/2012(R2)/2008(R2)/2003 users.

Cherry · Staff Editor
Cherry is an editor of AOMEI Technology, she covers backup & restore, hard disk & partitions management, cloud files transfer, website & database backup and so on for AOMEI. She enjoys helping people find solutions to their problems. She loves traveling, cooking, reading and so on. She takes most of time with her family when she is not working.