Add/Move/Merge Unallocated space to C drive in Windows Server 2008 R2


Most of the server computer users encountered the same problem that system C drive becomes full and not enough free space left. It is easy to understand – many types of files created or wrote to C drive every day, so C: drive runs out of free space sooner or later. It is bothersome in this situation, because nobody would like to start from scratch, keeping the server offline. It may cost several days to finish this work. In Windows Server 2008, Microsoft adds new Shrink Volume and Extend Volume functions under Disk Management, so some people want to shrink a volume to get free space and then add/ merge Unallocated space to C drive. However, many people feedback they cannot merge Unallocated space to C drive after shrinking partition, because Extend Volume is disabled. So in this article, I want to talk about merging Unallocated space to C drive in Windows Server 2008 (R2).

How to merge Unallocated space in Server 2008 Disk Management

1. Press Windows and R key to launch Run, type “diskmgmt.msc” to open Disk Management.

2. In Disk Management you’ll see all connected disks and partitions. From the screenshot, there are 3 drives and 2 Unallocated space.

Try to merge the first Unallocated to C drive: Right click C drive and select “Extend Volume”.

3. Extend Volume Wizard will by launched.

Extend Volume Wizard

4. The unallocated space will be added automatically, simply press Next.

Select unallocated space

5. Press Finish to execute.

10GB Unallocated space added to C drive.

Can’t Merge Unallocated Space to C: Drive

Try to merge the second unallocated space:

Right click C drive and you’ll find Extend Volume grayed out/disabled, so you cannot merge the unallocated space into C drive, why?

From Microsoft explanation, Extend Volume is workable only when there is adjacent Unallocated space. From the screenshot above, after shrinking D, the Unallocated space is behind D, of course you cannot add the Unallocated space to C drive, then what to do? In this situation, you need a 3rd-party software to move partitions.

How to move unallocated space behind c drive

Step 1: Download and install NIUBI Partition Editor, right click drive D and select “Resize/Move Volume“.

Resize volume

Step 2: In the pop-up window, drag middle position of drive D rightwards to move it.

Drag to move

Move D drive

Drag to move

Click OK and back to the main window, where the 10GB Unallocated space moved to behind C: drive.

Volume moved

How to add Unallocated space to C drive

Step 1: Right click C drive and select “Resize/Move Volume” again.

Add to C drive

Step 2: In the pop-up window, drag right border rightwards to hold the Unallocated space.

Drag to extend

Extend C drive

Drag to extend

Click OK and back to the main window, where C drive increased to 39.99GB by adding the 10GB Unallocated space.

Unallocated added

Watch the video how to move and mover Unallocated space to C drive in Windows Server 2008 (R2):

Merge Unallocated space

If you shrank D or other drive to get Unallocated space, follow the steps above to move Unallocated space and add into C drive. To expand system C: drive, do not delete D to get Unallocated space, because applications and services running from it will stop working.

Another point you should pay attention is selecting a reliable partition software, because partition resizing is writable, a bad program may cause system boot failure or data loss. NIUBI Partition Editor integrated unique Roll-Back Protection technology, which is able to roll back the server to the status before resizing. So your Operating System and data always keep intact even if power failure or other hardware issue occurred during resizing.

Furthermore, the optimized file-moving algorithm helps resize partition 30% – 300% faster than any other tools. In some special situations especially when there are tons of file in the partition, NIUBI Partition Editor can be 500% faster, which is strictly tested. So this tool is recommended as the safest and fastest one!

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