Resize Partition/Volume in Windows Server 2019

by Lance, Updated on: August 19, 2020

This article introduces how to resize disk partition in Windows Server 2019, detailed steps to resize system C drive and data volume without losing data.

Partition resizing means change size of allocated partition. It can't be better if you can resize partition in Windows 2019 server without losing data, otherwise, you have to waste a long time to recreate volumes and restore everything from backup. Windows Server 2019 Disk Management has built-in Shrink Volume and Extend Volume functions to help resize partition without losing data (in most cases). However, because of many restrictions, it is not the best tool. In this article, I'll introduce how to resize server 2019 partition with both Disk Management and third party partition software.

1. Resize partition in Windows Server 2019 Disk Management

How to shrink partition:

  1. Press Windows and X on the keyboard and then click Disk Management in the list.
  2. Right click a NTFS partition and select Shrink Volume.
  3. Enter an amount of space and click Shrink. If you do not enter a value manually, maximum available space will be used by default.

How to extend partition (such as C:):

  1. Right click D: drive in Disk Management and select Delete Volume, then its disk space will be changed to Unallocated.
  2. Right click C: drive and select Extend Volume.
  3. Click Next till Finish in the pop-up Extend Volume Wizard window.

Caution: do not delete D if you installed programs or any Windows services in it.

It seems easy to resize partition with Windows Server 2019 Disk Management, but as I said above, it has many restrictions:

  1. Only NTFS partition can be resized, FAT32 and any other types of partitions are not supported.
  2. Disk Management can only shrink a partition towards left and make Unallocated space on the right.
  3. It can only shrink little space when there are unmovable files located in this partition.
  4. It can only extend a partition when there's contiguous Unallocated space on the right.
  5. It cannot extend partition by shrinking any other one.

Some people may ask, there are both Shrink and Extend Volume functions, why cannot resize C drive by shrinking D? As I explained above, Unallocated space that shrunk from D is nonadjacent to C drive, therefore, Extend Volume is disabled.

Extend Volume disabled

2. Take care of data while resizing partition in Windows 2019 server

With server partitioning software, there are no such limitations. It is also much easier to resize partitions, because you just need to drag and drop on the disk map. There are many partition software for Server 2019 in the market, the GUI and functions are similar, but it doesn't mean any one is okay.

While resizing partition in Windows Server 2019, there's potential system damage and data loss risk. When shrinking and extending partition, the start or end position will be changed, all parameters of associated partition and files must be modified absolutely correct. Sometimes all files in a partition must be moved to new locations. Therefore, any software error or hardware issue could cause part of parameters failed to be modified, then damage occur.

Therefore, you'd better back up first and run safest tool. Better than other software, NIUBI Partition Editor is much safer and faster because of the advanced technologies:

3. Resize Server 2019 volume with NIUBI Partition Editor

Download NIUBI Partition Editor and you'll see the main window with disk partition structure and other information on the right. Available operations to selected disk or partition are listed on the left and by right clicking. Unavailable operations are hidden automatically to keep the interface clean.

Right click a NTFS or FAT32 partition 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 resize system partition C in Windows Server 2019:

  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.

Video Server 2019

  • 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 want to resize E: drive (nonadjacent partition) to expand C, there's an additional step to move Unallocated space before adding to C drive.
  • Follow the steps if you want to resize other partition to increase D drive space for Server 2019.
  • No software can extend a partition by taking free space from another separated disk. If there's unavailable free space on the same disk, follow the steps to copy disk to a larger one.
  • 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.

Besides resizing partition for Windows Server 2019/2016/2012/2008/2003, NIUBI Partition Editor helps do many other disk and partition management operations.