Merge Unallocated space

How to combine Unallocated space in Windows Server 2012

Unallocated space is part of disk space that does not belong to any partitioned drives. You can create new volumes with it by either Disk Management or partition software easily. If C: drive or any data volume is running low on disk space, you can merge Unallocated space to these volumes to increase partition size. In this article, I’ll show you how to combine Unallocated space in Windows 2012 Server (R2) without losing data, fast and easily.

Merge Unallocated space

Merge to left adjacent partition

In Windows Server 2012 built-in Disk Management, you can combine Unallocated space with Extend Volume functionality. However, you can only merge the Unallocated space to adjacent volume that is on the left side. If you want to combine to right volume or any nonadjacent partition, you need third party partition software.

Steps to combine adjacent Unallocated space to C drive:

  1. Right click Windows on bottom left corner of the screen and select Disk Management.
  2. Right click C drive and select Extend Volume.
  3. Finish the Extend Volume Wizard.

Another way to merge Unallocated space on Server 2012:

Download NIUBI Partition Editor, you’ll see a 30GB Unallocated space between drive D and E.

Unallocated space

Right click drive D and select Resize/Move Volume, in the pop-up window you’ll see Disk Map on the bottom and drive D on the top. Drag the right border of D rightwards.

Drag rightwards

30GB Unallocated space will be combined to D drive.

Unallocated space combined

To avoid incorrect operation, NIUBI works in virtual mode, to change physical disk drive, click Apply on top left to confirm.

Apply to confirm

Merge to right adjacent partition

If you want to combine the 30GB Unallocated space to drive E, it is impossible in Server 2012 Disk Management, but with NIUBI it is very easy.

Right click drive E and select Resize/Move Volume, in the pop up window, drag left border of E leftwards.

Combine Unallocated to E

And then this Unallocated space will be merged to E.

Unallocated space merged

Merge to nonadjacent partition

If you want to merge Unallocated space to C drive, you just need an additional step to move partition.

Unallocated space

Right click drive D and select Resize/Move Volume, in the pop-up window, drag middle position rightwards.

Drag to move

And then the Unallocated space will be moved to left side.

Unallocated moved

Right click C and select Resize/Move Volume again, in the pop-up window, drag left border rightwards to combine the Unallocated space.

Unallocated behind C

As you see, with this tool you can merge Unallocated space to either adjacent partition by 1 step. If you want to combine Unallocated space to nonadjacent volume, you just need 1 more step to move partition.

Besides resizing, moving and merging volumes to change partition size, NIUBI Partition Editor can copy volume to back up or transfer data. Defrag, convert, fix file system error to improve server performance. Set disk read-only, hide, wipe volume and much more.

How to merge Unallocated space in Windows Server 2012 (R2)?
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