How to Fix Convert to GPT Is Greyed Out in Windows

Disk Management and DiskPart are the built-in Windows tools for creating, deleting, and formatting partitions and for converting a disk between MBR and GPT.

However, they have limits, and users often run into errors such as “The specified disk is not convertible”, “Virtual Disk Service error: the object is not found”, and “convert to GPT is greyed out”. Here is a real case posted on the answers.microsoft.com forum:

Convert to GPT Disk Grayed Out in Windows Disk Management. I have initialized a new disk (D) which is not boot disc (C) as MBR, but after reading online it seems better to initialize at GPT as I’m running Windows 11. However, When I attempt to convert the disk from MBR to GPT in disk management, the GPT option is grayed out.https://answers.microsoft.com/en-us/windows/forum/all/convert-to-gpt-disk-grayed-out-in-windows-disk/a1cc0518-1e48-4d78-a831-758cef841fa0

Why Is Convert to GPT Greyed Out in Disk Management?

The Convert to GPT Disk option is commonly greyed out in Disk Management when the target MBR disk still contains partitions or volumes. Windows Disk Management requires the disk to have no existing volumes before converting its partition style from MBR to GPT.

To use Windows’ built-in conversion tools, back up your data and delete the existing volumes on the target disk first. Can you convert MBR to GPT without data loss? Yes. A third-party tool such as MiniTool Partition Wizard can do it directly, as shown below.

How to Fix Convert to GPT Greyed Out in Windows 10/11

How do you fix convert to GPT greyed out in Windows 10/11? There are two methods: convert to GPT without data loss using MiniTool Partition Wizard, or delete all partitions and then convert the disk with Windows tools.

Method 1. Convert MBR to GPT Without Losing Data Using MiniTool Partition Wizard

If the convert to GPT disk is greyed out in Disk Management, the simplest solution is to use an alternative such as MiniTool Partition Wizard. It can initialize a disk to GPT/MBR and convert MBR to GPT without data loss. It can also extend, resize, and move partitions, convert NTFS to FAT, migrate the OS, and change the cluster size.

Step 1. Launch the MiniTool software to enter its main interface, select your desired disk, and click on Convert MBR Disk to GPT Disk from the left action panel.

Step 2. Click on Yes to confirm if you are required to enable UEFI Boot mode from BIOS after applying this change.

Step 3. Click on Apply to execute the pending operation. Then you can refer to this post to change BIOS mode to UEFI.

If the disk has no partition: initialize it to GPT

If there is no partition on the hard disk, you can fix the “convert to GPT is greyed out” issue by initializing the disk. Select Initialize to GPT in the main interface and click Apply.

Method 2. Delete All Partitions and Convert to GPT Using DiskPart

Another fix is to delete all partitions on the disk and then convert it with a Windows tool. You can also delete the volumes in Disk Management and then right-click the disk to choose Convert to GPT Disk. Here, DiskPart is used as an example.

Step 1. Press Win + R keys to open the run box, and then type diskpart.exe in it and press Enter. Then click on Yes to confirm it.

Step 2. In the pop-up window, type the following commands in order and press Enter after each one.

• list disk
• select disk * (replace * with the disk number that you want to convert to GPT)
• clean (to remove all existing partitions on the disk)
• convert gpt

Convert to GPT Is Greyed Out FAQ

Conclusion

If the Convert to GPT option is greyed out, check whether the target disk still contains partitions or volumes. If you need to preserve them, use a compatible partition manager like MiniTool Partition Wizard.

If you choose DiskPart, back up your files and make sure you select the correct disk before running clean. Always choose the conversion method based on your disk configuration and data needs.

For issues related to MiniTool software, contact us via [email protected].