Extend Volume in Windows Server 2012

Updated on: June 5, 2019

This article introduces how to extend volume in Windows Server 2012 (R2) native Disk Management, its disadvantages and better method to extend disk partition.

Precondition to use extend volume

Many server administrators need to resize allocated partition after running the server for a period of time. Especially when system partition C is running out of space, nobody likes to reinstall Windows and programs. It also costs a long time to recreate partition and restore from backup.

Microsoft provides Shrink and Extend Volume function in native Disk Management tool to help change partition size. However, both functions have restrictions that cause you cannot shrink and extend partition in some situations.

To increase partition size with Extend Volume in Server 2012 Disk Management, your disk partition configuration must meet the requirements:

After shrinking partition D, you can't extend volume C and E. Because Unallocated space can only be made on the right side of D, it is non adjacent to C drive and is on the left side of E drive.

As you see in my server, Extend Volume is disabled for these partitions.


3 In most of servers, programs or some Windows services are installed in drive D, so you cannot delete it to get adjacent Unallocated space. Furthermore, if D is a Logical partition, you still cannot extend volume C by deleting it.

Extend volume disabled

How to extend volume in Server 2012 DM

When your disk partition configuration meets the requirements and the right adjacent partition can be deleted, it is very easy to extend volume via Windows Server 2012 Disk Management. Steps:

Step 1: Open Disk Management (press Windows and X on keyboard), right click the partition (here is D:) and select "Extend Volume".

Extend volume

Step 2: Extend Volume Wizard window will be opened, simply click Next to continue.

Extend Volume Wizard

Step 3: Available disk and space is selected by default, click Next to continue or manually change it first.

Enter amount

Step 4: Click Finish to confirm and start extending.

Confirm extending

In a short time, drive D: is extended by merging the right adjacent Unallocated space.

Volume extended

Better way to extend volume with partition editor

To extend volume in Windows 2012 server, NIUBI Partition Editor is better choice. Comparing with the native Disk Management tool, it has advantages such as:

Comparing with other server partition software, NIUBI also has advantages such as:

Download NIUBI Partition Editor and follow the steps in the video to extend volume partition in Windows Server 2012 (R2).

Video guide