Change/Increase Partition Size for Windows Server 2019

by Jacob, Updated on: March 22, 2020

This article introduces how to change partition size in Windows Server 2019, decrease and increase partition size for Server 2019 without losing data.

Disk partitions are created while installing Windows or by OEM manufacture, after running the server for a period of time, system C: drive is getting full. In that case, is it possible to change partition size without losing data or starting over? The answer is yes. With disk partition tools, you can increase partition size of C drive with free space in other partitions. In this article, I'll show you how to change and increase partition size in Windows Server 2019 with its built-in tool and third party software.

Change partition size with Server 2019 Disk Management

Windows Server 2019 has its built-in Disk Management tool to help change partition size. Shrink Volume function can decrease partition size and release free space to Unallocated. Extend Volume can increase partition size when there is adjacent Unallocated space on the right side. However, Disk Management cannot increase a partition by decreasing another one. In addition, only NTFS partition can be resized with this native tool.

Learn how to shrink partition with Server 2019 Disk Management and what to do if it cannot decrease partition under particular environment.

Before extending a volume in Server 2019 Disk Management, you must delete or shrink another drive to get Unallocated space. When you shrinking drive D with Shrink Volume, Unallocated space can only be made on the right side, but to increase C drive with Extend Volume, Unallocated space must be on the left side of D drive. As you see in the screenshot, Extend Volume greyed out for both C and E drive after shrinking D.

Extend Volume disabled

The only option to enable Extend Volume to C drive is by deleting D to get contiguous Unallocated space, but programs and some Windows services are running from it, so you cannot delete it. To decrease and increase partition size in Windows Server 2019, you'd better run server partition software.

There are many choices in the market, but you'd better back up first and run the safest tool, because there's potential system damage and data loss risk while resizing disk partitions. All parameters of associated disk, partition and files must be modified correctly, all files in the partition that requires shrinking and moving must be moved to new locations. Therefore, any software error or hardware issue could cause system/data disaster.

Better than other disk partition software, NIUBI Partition Editor has advanced technologies to protect system and data:

Increase partition size with NIUBI Partition Editor

To decrease and increase partition in Windows Server 2019, it is very easy with NIUBI PE, you just need to drag and drop on the disk map.

How to decrease partition size:

Download NIUBI Partition Editor, right click the partition that you want to decrease (here is D:) and select "Resize/Move Volume".

Option 1: If you drag left border towards right or enter an amount in the box of Unallocated space before, then Unallocated space is made on the left.

Shrink towards right

Option 2: If you drag right border towards left or enter an amount in the box of Unallocated space after, then Unallocated space is made on the right.

Shrink towards left

How to increase partition size in Windows Server 2019 with NIUBI:

  1. Follow Option 1 to shrink D: drive and make Unallocated space on the left.
  2. Right click C: drive and select Resize/Move Volume again, drag right border towards right to combine this Unallocated space.
  3. Click Apply on top left to execute.

If you want to increase E: drive, make Unallocated space on the right when shrinking D drive. Then drag left border of E towards left to combine Unallocated space.

Video Server 2019

  • If you want to shrink E: drive to expand C, there's an additional step to move Unallocated space before adding to C drive.
  • Follow the steps in the video if you want to increase D drive space for Server 2019.
  • If there's not plenty of free space on the same disk, follow the steps to copy disk to a larger one.
  • This software is designed to work in virtual mode, real disk partitions won't be changed until click Apply to confirm. Simply click Undo to cancel if you did anything wrong.
  • If you use any types of hardware RAID arrays such as RAID 0/1/5/10, do not break array or do any operation to raid controller, simply follow the same steps in the videos.

Change partition size for virtual machine in VMware/Hyper-V

If you run Windows Server 2019 as guest virtual machine in VMware or Hyper-V, there's no difference to change and increase partition size if there's available free space on the same virtual disk.

When the whole disk is full, unlike physical disk, virtual disk can be extended directly. Follow the steps to increase virtual disk size in VMware or Hyper-V. After expanding disk, additional space is shown as Unallocated on the end. Follow the steps to add Unallocated space to C drive.

Besides shrinking, extending, moving and copying partitions, NIUBI Partition Editor helps do many other disk and partition management operations.