By Cherry / Last Updated July 19, 2019

The necessity of extending partition on Windows Server 2016

Windows users may know that the partitions are not divided perfectly at the first time. As time goes by, there are chances that that some partitions are too small for storage data, while some partitions are too big to waste a lot of space. And system partition running out space can cause whole operating system run slowly.

In such condition, you may want to re-partition the disk so that the space can be used more reasonable or enlarge system partition to speed up operating system.

Extend volume on Windows Server 2016 with three tools

You can use three different useful tools to extend partition in Windows Server 2016. If a contiguous unallocated space behind the partition that you want to extend is available, you can choose the first or the second second. If not, employ the third.

# 1. Enlarge partition on Windows Server 2016 with Diskaprt

Diskpart is the built-in tool for Windows users to manage their disks with command line. You can use it to extend partition for Windows Server 2016 easily. Press “Win+R” and type “diskpart” to open the CMD. Then, type the relative syntax to extend the partition:

  • list disk

  • select disk

  • list volume

  • select volume

  • extend size=

Type the parameters above, it will shown as the next screen shot, and you may extend the volume successfully.

Diskpart Extend Volume

However, if there is no unallocated space contiguous to the volume you want to extend, this syntax will be invalid.

#2. Enlarge partition on Windows Server 2016 with Disk Management

Windows Server 2016 is the latest operation system of Windows Server. It has the tool Disk Management. You can use it to resize Windows Server 2016 partitions with the Extend Volume and the Shrink Volume.

To use Disk Management to extend volume, you need to right click the partition you want to extend (here we extend the system partition), select Extend Volume to get into this wizard to extend it step by step.

DM Extend Volume

However, sometimes when you open the Disk Management to resize the partition, the Extend Volume is grayed out and you cannon use it. As Extend Volume of the Windows Server 2016 Disk Management still asks there must be unallocated space behind the partition and adjacent to it. If there is no unallocated space nearly to it, the Extend Volume would be grayed out like the following picture, so that you cannot extend volume for the partition.

Extend Volume Grayed Out

Then, what should you do when the Disk Management and Diskpart unable to extend volume in Windows Server 2016?

#3. Extend volume in Windows Server 2016 with AOMEI Partition Assistant

Users cannot extend volume with Disk Management and Diskpart when there is no contiguous unallocated space. Fortunately, you can use other software like AOMEI Partition Assistant Server to increase partition size without deleting partitions and with various ways. To extend volume in Windows Server 2016, it provides at least 3 methods. Install, run this software and have a look at how it works.

Option A. Use the Extend Partition Wizard

AOMEI Partition Assistant has a great Extend Partition Wizard, which can lead you to extend partition step by step without efforts.

Option B. Extend volume by making use of another partition’s free space

It is general situation that the system partition is running out of space while other partitions have plenty of free space, and there is no unallocated space. At this point, you can use the “Allocated free space” to extend the system partition by using the free space from other partitions. Right click the partition, select Resize Partition. It will lead you to the page where you can drag the bar to the left or right side, or input the specific number to extend the partition.

Option C. Use the Resize Partition to extend partition

If there is any unallocated space adjacent to the partition (if the unallocated space isn’t adjacent to the partition, you can make it adjacent to the partition by Move Partition) you want to extend, no matter it is at the right side or left side or both side, you can use Resize Partition to extend it. Follow the guide. Click Apply to submit the pending operations.


With the help of AOMEI Partition Assistant Server, you can extend Windows Server 2016 partitions without the limitations of Disk Management. Even when the Extend Volume grayed out in Disk Management, you can find out more than one way to extend volume from AOMEI Partition Assistant for Windows Sever 2016. Actually, you can use it to manage all the Windows Server OS, including Windows Server 2012 (R2), 2008 (R2), 2003, etc.