Merge Unallocated space in Windows Server 2012

Updated on: November 16, 2019

This article introduces how to merge Unallocated space in Windows Server 2012 (R2). Combine unallocated space to left, right or any nonadjacent partitions.

Unallocated space is part of disk space that does not belong to any allocated partition. 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 to left partition

If you want to combine unallocated space to contiguous partition on the left, you can achieve via Windows Disk Management without any software. However, this partition must be formatted as NTFS, FAT32 and all other types of partitions are not supported.

How to merge Unallocated space with Disk Management:

  1. Press Windows and X on the keyboard, then select Disk Management from the list.
  2. Right click the NTFS partition that is adjacent and on the left of the Unallocated space, then click Extend Volume.
  3. Click Next till Finish in the pop-up Extend Volume Wizard window.

If this partition is FAT32, when you right click it, Extend Volume is greyed out. You need to run third party partition editor software.

How to combine Unallocated space with NIUBI:

Download NIUBI Partition Editor and you'll see the main window with disk partition structure and other information. There is 20GB Unallocated space next to D: drive.

NIUBI Partition Editor

Right click drive D: and select Resize/Move Volume, drag right border towards right in the pop-up window.

Drag to merge

Then this Unallocated space is merged to D drive.

Combine Unallocated to E

This software is designed to work in virtual mode first, real disk partitions won't be changed until click Apply on top left to confirm.

Combine Unallocated space to right volume

To merge unallocated space to the right contiguous partition (E:), it is similar, just drag towards the opposite direction.

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

Drag to merge

Then this Unallocated space is combined to E drive.

Combine Unallocated to D

Merge Unallocated space to nonadjacent drive

If you want to combine unallocated space to any nonadjacent partition, you need to move it first.

For example: how to merge Unallocated space to C: drive in Windows Server 2012:

Step 1: Right click drive D: and select "Resize/Move Volume", drag middle position towards right.

Move unallocated

Then Unallocated space is moved to the left side.

Merge Unallocated to C

Step 2: Right click drive C: and select "Resize/Move Volume", drag right border towards right.

Merge to C

Then Unallocated space is merged into C drive.

Move Unallocated space

Watch the video how to merge Unallocated space in Windows Server 2012 R2:

Video guide

Combine Unallocated space to other disk?

You can get Unallocated space by either shrinking or deleting a partition, this space can be combined to other partitions in the same disk easily with NIUBI. However, in some server, there is not plenty of unused space for you to shrink. In other words, all partitions in this disk are almost full.

In this situation, some people wonder whether it is possible to merge Unallocated space from other disk, the answer is no. Because the size of a hard disk is fixed, a 500GB disk can't be reduced to 300GB or increased to 700GB.

Instead, you can copy this disk to a larger one, extra disk space will be shown as Unallocated on the end of disk. Then you can merge the Unallocated space to any partition(s). Follow the steps in the video:

Video guide

Check your disk partition structure and decide which partition you want to combine Unallocated space to, then follow the corresponding method above. Besides, shrink, move and extend partition, NIUBI Partition Editor helps you copy, merge, convert, defrag, scan, hide, wipe partition, etc.