How to resize/extend system partition in Windows Server 2016?

The same with previous Windows editions, in Windows Server 2016, system partition runs out of free space and becomes full after running the server for a period of time. In this situation, the best idea is resizing partitions to extend system partition. By this way, you can get out of trouble much easier and the server back to be smooth quickly. In this article I’ll introduces how to extend/resize system partition in Windows Server 2016 in an easy way.

About System partition

Many people think system partition is the one that runs Windows Operating System, but it is not.

System partition 2016

From the screenshot, the partition marked as System is a System Reserved partition, it is not C drive. However, no matter which drive you want to extend, it is possible, so I no longer speak a like a book. As the comprehension of most people, to avoid misunderstanding system partition here is C drive.

Benefits to resize partition

Resize partition means change size of a partition, to extend system partition, you should shrink another data drive to release unused space. By resizing partitions, you can add free space to the system C drive quickly, keeping the server running without recreating drives to start from scratch.

However, remember to back up the server before any operations. It is also important to select a reliable partition software, because a bad program is very likely to cause system failure, partition corruption or data loss.

How to resize system partition on Windows Server 2016

To extend system partition, there are two choices – Windows built-in Disk Management and 3rd party software. No matter which one you use, remember that the partitions to shrink and extend should be in the SAME hard disk.

Extend system drive under Disk Management

In Windows Server 2016 Disk Management console, you can resize partition via Shrink Volume and Extend Volume function. Steps to extend C drive:

1: Right-click C drive and select “Extend Volume…

Extend volume

2: The Extend Volume Wizard will be launched, click Next to continue.

Extend wizard

3: In the pop-up window, select the available space and click Next.

Type value

4: Confirm the operation and click “Finish” to proceed.


The system partition extended by adding 20GB Unallocated space into it.

Partition extended

However, only when there is adjacent Unallocated space behind, you can extend the system partition. If there is another drive between C drive and the Unallocated space, Extend Volume is greyed out and you cannot extend the system partitions.

Extend volume greyed out


Resize partition with partition software

With server partition software, it is much easier and no such limitations, you can shrink any data drive to extend C drive.

Steps to resize system partition on Windows Server 2016:

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

Resize volume

Select Resize

Step 2: In the pop-up window, drag left border rightwards to take free space out from D.

Drag to shrink

Shrink d drive

Drag to shrink

Click OK and back to the main window, 20GB Unallocated space created behind C: drive.

Unallocated created

Step 3: Right click C drive and select “Resize/Move Volume” again. In the pop-up window, drag the right border rightwards to hold the Unallocated space.

Drag to extend

Extend C drive

Extend C

Step 4: Click OK and back to the main window, C drive increased to 60GB by adding the Unallocated space. Click Apply on top left to execute, done.

C drive extended

If there is not plenty of free space in the adjacent drive D, you can get free space from other drives in the same disk.

In Summary

Comparing with Windows Disk Management, the partitioning software is much more powerful. It is extremely easy to resize system partition on Windows Server 2016.

Note: NIUBI Partition Editor integrated unique Roll-Back technology to protect Operating System and data intact, even if power failure or other hardware issue occurred during resize partitions, because it is able to roll back the server to the status before resizing automatically and rapidly. The unique file-moving algorithm helps resize partition 30% – 300% faster than other tools.

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