Windows Server 2008 R2 Extend Volume option is greyed out/disabled

Windows Server 2008 r2 extend C drive greyed out

In Windows Server 2003 Disk Management console, you can only do some basic management operations such as create partition, delete and format partition, change drive letter. When system C drive is running out of space and becomes full, many people have to back up everything, delete all partitions and restore. It costs such a long time. In Windows Server 2008, Microsoft added new Shrink Volume and Extend Volume functions, with which you can decrease and increase partition size without losing data (in most cases). However, many people found that Extend Volume option is grayed out in Windows Server 2008 Disk Management, for example:

I am running out of space on my C drive, running Windows server in VMware. the option to extend C drive is greyed out in Windows 2008 r2, what to do?

I am trying to enlarge an existing volume via DM on a Server 2008 R2 environment. Disk management displays the unallocated directly behind the D: drive, but the Extend Volume is grayed out when I right-clicking C drive, anything wrong?

Extend volume grayed out

In this article, I’ll introduce why Extend Volume greyed out in Server 2008 (r2) Disk Management and show you how to get out of this trouble.

Why Extend Volume option is disabled in Server 2008

To better explain, open Server 2008 Disk Management by clicking Server Manager > Storage > Disk Management, or press Windows + R to open Run, type diskmgmt.msc and press Enter.

In my server, there are 4 drives in Disk 0: System Reserved, drive C, D and E. If you right click C drive, Extend Volume is greyed out.

Add space to C

Try to decrease D drive with built-in Shrink Volume function.

Shrink volume

Then I got 10GB free space behind D drive.

Got free space

Extending C drive is still disabled:

Extend disabled

What happens if I delete D drive?

Delete D

Now there is 40GB free space behind C drive, but Extend Volume is still unavailable.

Drive deleted

What about deleting this Extended partition?

Delete partition

Now extend volume is enabled in Server 2008 Disk Management.

Extend available

The reasons why extend volume greyed out in Windows Server 2008 r2 Disk Management:

  1. The partition you want to expand is formatted with FAT32, only NTFS partition can be extended.
  2. To extend C drive, there must be adjacent Unallocated space on the right, but you cannot get such required space after shrinking any partition in Disk Management.
  3. The only method is deleting the contiguous D: drive, but if this drive is in Extended Partition, you still cannot extend C drive except deleting all Logical drives in this Extended Partition and the Extended Partition itself.
  4. There’s maximum 2TB restriction on MBR disk. If you have a 2TB+ MBR disk, Extend Volume is also disabled even if there’s contiguous Unallocated space on the right side.

How to fix Server 2008 r2 Extend Volume greyed out

  1. If you’ve shrunk D drive in Disk Management, run NIUBI Partition Editor to move D drive towards right and move Unallocated space next to C drive.
  2. If you want to extend a FAT32 partition, you must run third party software such as NIUBI.
  3. If they partitions that you want to shrink and extend are different (Primary and Logical), you also need to run third party software.
  4. If you want to extend a partition larger than 2TB, you must convert MBR disk to GPT in advance.

To fix Windows Server 2008 Extend Volume greyed out issue, follow the steps in the video:

Extend Volume disabled

Learn More Download