Need to convert disk to GPT
“Hi, experts. I am trying to convert my brand new WD drive to GPT in Disk Management on my Windows Server 2016 computer, but the option “Convert to GPT Disk” is ALWAYS greyed out! So I am unable to convert disk to GPT now. Why and how can I convert disk to GPT successfully in Windows Server?”
MBR (Master Boot Record) and GPT (Guide Partition Table) are two kinds of disk style. You might need to convert MBR to GPT for different reasons. The most important one might be that your disk is over 2TB, and you want to make fullest use of this disk. That’s because the MBR disk cannot support disk larger than 2TB while the GPT can. If an over 2TB hard drive is initialized to MBR, the rest space will be shown as “Unallocated” and cannot be used.
Why the option “Convert to GPT Disk” greyed out?
From the user case above, we can know that converting disk from MBR to GPT via Disk Management is not as easy as it sounds like. When the "convert to GPT greyed out Windows Server 2016/2012/2008" issue occurs, the conversion cannot continue any more.
Generally speaking, that's mainly because the Disk Management tool can only convert an empty disk between MBR and GPT. That’s to say, when the chosen MBR disk you are trying to convert is not empty, but contains some partitions or volumes, the option “Convert to GPT Disk” will be greyed out. But no need to worry about that, below we will show you how to fix convert to GPT greyed out in Windows Server 2016/2012/2012 (R2), 2011.
Successfully convert disk to GPT in Windows Server Disk Management (DATA LOSS)
Since we have known that only when the disk is empty, the Windows Server Disk Management can convert disks from MBR to GPT. You have to delete all your partitions or volumes before conversion.
Step-by-step to convert MBR to GPT in Disk Management
Importance: If the volumes contains something vital, you had better copy partitions to another disk before deleting them one by one since this operation will lead to data loss .
1) Right click My Computer/This PCon the desktop and select Manage to open Disk Management.
2) On the Disk Management interface, right-click on each partition on the disk you want to convert and select "Delete Volume" to make it an empty disk.
3) Then right click on the disk, and select "Convert to GPT Disk". Now the option will be clickable.
After finishing the conversion, you can then create new partitions on the disk as you like or need.
Easier way to convert disk from MBR to GPT (WITHOUT DATA LOSS)
As mentioned above, Disk Management requires you to remove partitions on the target disk before conversion, so you might suffer data loss. What's more, this tool could not convert the system disk from MBR to GPT since the system partitions cannot be deleted.
So here we recommend a powerful 3rd party software-AOMEI Partition Assistant Server (supporting Windows Server 2003, 2008 (R2), 2012 (R2), 2011, 2016, and 2019). With it, you can directly convert disks with partitions on between MBR and GPT styles, so you don’t have to delete partitions in advance. What’s more, it can also convert system disk to GPT or MBR without data loss. Below we will take converting a data disk as an example.
Warning: in order to avoid data loss caused by uncontrollable issues like sudden power failure, human errors during the conversion, it is always wise to clone hard disk before proceeding.
1) Install and launch this software.
2) Right-click the disk you want to switch and hit "Convert to GPT disk" in the a drop down menu. Click OK to confirm the operation.
3) Click Apply button to proceed the changes.
With AOMEI Partition Assistant Server, you can perfectly get around “convert to GPT greyed out Windows Server 2016” issue, and same apply to Sever 2012/2008/2003. Also you can use it to convert system disk to GPT. What’s more, you can also use this versatile disk manager software to migrate OS from GPT to MBR disk and vice versa, convert dynamic disk to basic and more.