Windows Server 2016 Extend Volume option is greyed out
Microsoft added “Extend Volume” and “Shrink Volume” functions in Disk Management from Windows Server 2008. It is very easy to understand, Extend Volume is used to increase partition size and Shrink Volume is used to reduce partition size. When system partition C is getting full, many server administrators try to shrink D and expand C drive. However, they find that Server 2016 Extend Volume option is grayed out, even after shrinking any other partitions. In this article, I’ll introduce the reasons why Extend Volume greyed out in Windows Server 2016 Disk Management and what to do when Extend Volume is disabled to C drive.
The cases Extend Volume greyed out in Server 2016 DM
First of all, let’s see the common scenarios of Extend Volume option greyed out in Windows 2016 Disk Management.
If you right click a drive without any Unallocated space, Extend Volume is absolutely grayed out.
Some people try to shrink D to get Unallocated space via “Shrink Volume” function.
Some free space is taken out from D but Extend Volume is disabled to C drive, too.
Some people even tried to delete the contiguous D: drive.All operations below are just used to explain why Extend Volume grayed out in Windows 2016 server. They are not the steps to help fix this issue.
However, Extend Volume is still greyed out after deleting.
Some people find that the space deleting from D shows as “Free” instead of “Unallocated”. This is because that D: drive is a Logical drive. Different with independent Primary partition, Logical drive belongs to the Extended partition. If you want to convert Free space to Unallocated, you must delete all Logical drives and then the entire Extended partition.
Delete the Extended partition.
Now, the disk space shows as Unallocated, and Extend Volume is enabled to C drive.
Reasons why Extend Volume greyed out in Windows Server 2016 Disk Management:
- You may try to extend a FAT32 partition. From Microsoft explanation, only NTFS and RAW format partition can be extended.
- Extend Volume only works when there’s contiguous Unallocated space on the right side, but Disk Management cannot make such required space via Shrink Volume function.
- If the adjacent drive D is a Logical partition, you cannot extend C drive by simply deleting D. You must delete all Logical drives and the Extended partition.
- If you try to extend partition in a 2TB+ MBR disk, you may encounter the same issue, because the maximum partition size is 2TB on MBR disk.
What to do when Extend Volume greyed out in Server 2016
Open Disk Management in your own server, check your disk partition structure and other information. Find out the reason and follow the corresponding method below.
Let’s begin from the most common situation, Extend Volume greyed out to C drive after shrinking D (or other partition).
How to fix Windows Server 2016 Extend Volume greyed out in C drive:
Step 1: Download and install NIUBI Partition Editor. You’ll see the same disk partition structure in the main window. There’s 10GB free space that is shrunk from D.
Step 2: Right click D: drive and select “Resize/Move Volume“.
In the pop-up window, drag the middle block towards right.
Click OK and back to the main window, the 10GB Unallocated space is moved to the left, now it is behind C: drive.
Step 3: Right click C: drive and select “Resize/Move Volume” again. In the pop-up window, drag right border rightwards to merge this Unallocated space.
Click OK and back to the main window, the Unallocated space that shrank from D is added to C drive.
Step 4: Click Apply on top left to execute, done. Check in Disk Management, yes it works.
Note: real disk partitions won’t be changed until click Apply to confirm.
Follow the full solution here.
No adjacent Unallocated space is the most common reason why Extend Volume greyed out in Windows Server 2016. To solve this problem, you just need to move Unallocated space behind C drive. There are other reasons why Extend Volume option is disabled in Server 2016. No matter for which reason, this issue can be fixed easily with NIUBI Partition Editor, check the video: