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Convert to GPT/MBR Grayed Out in Disk Management. How to Solve?

Posted on Jan 16, 2018 by Tracy King to Partition Master

When you failed to convert MBR to GPT disk in Windows Disk Management due to convert to GPT option greyed out, try to use EaseUS Partition Master or diskpart command to convert MBR to GPT or convert GPT to MBR without any problem.

"I got a 1TB Seagate hard drive and it uses MBR for their partition table. Now thinking to convert MBR to GPT in Windows disk management (note that I don't want to lose anything on the drive) but failed. 'convert to GPT' grayed out. It requires me to remove all partitions from the drive to make it available."

If your attempt to convert HDD/SSD to GPT in Windows Disk Management fails due to "Convert to GPT" grayed out, don't hesitate to use the alternative methods to complete the operation.

  • Fix 1: Convert to GPT with EaseUS Partition Master
  • Fix 2: Convert to GPT with diskpart command line

How to fix "Convert to GPT" grayed out with EaseUS Partition Master?

EaseUS Partition Management provides simple yet powerful disk/partition management for home users as well small to large businesses. It's the best Windows Disk Management alternative when resize/move partition, format partition, copy partition, merge partitions and convert MBT to GPT or convert GPT to MBR, etc. When converting partition table between MBR and GPT got issues and can't be completed in disk management, it can be quickly and happily solved by this partition manager software.

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 Windows 10 is supported

To directly convert MBR to GPT on SSD or HDD without losing data, please follow the detailed steps:

Step 1. Right-click the MBR disk that you want to convert to GPT disk, and select "Convert MBR to GPT" feature.

convert mbr to gpt

Step 2. Click "Apply". Your MBR disk has now been successfully converted to GPT disk, with data still kept on the drive.

How to fix "Convert to GPT" grayed out with diskpart utility?

Diskpart utility is also universally applied in all Windows operating system, as it provides all-purpose disk and partition management features as EaseUS Partition Master. However, to fix "convert to GPT" grayed out with diskpart, it's a little different and needs to be done more carefully.

Using the diskpart command line to convert MBR disk to GPT disk, you have to backup all your data first and delete all partitions and volumes. When things get ready, do as follows.

Step 1. Open command prompt and type in DISKPART and press Enter.
Step 2. Then type in list disk  (Note down the number of the disk that you want to convert to GPT).
Step 3. Then type in select disk number of disk.
Step 4. Finally, type in convert gpt.

Hope at least one method we introduced helps you fix "convert to GPT" grayed out in Disk Management. In terms of ease of use and data safety, EaseUS Partition Master should be the best option in converting MBR to GPT. Also, you can apply the software to fix "Extend volume"option grayed out and many other issues that disk management couldn't solve.

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 Windows 10 is supported