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How to Extend C Drive in Windows Server 2019/2016

Extend C Drive Window Server in 2019/2016. A step-by-step guide to extending Window Server volume with built-in features and third-party utility.

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Tracy King

Updated on Apr 22, 2024

The default C drives on Windows Server store all of the system information, operating system, applications, and files you download from the internet. Though it has the storage capacity, the space will quickly fill up if you keep most of your information on drive C. The most typical problem with C drive is that it runs out of space. In Windows Server 2019/2016, this is a widespread problem. The problem is resolvable by freeing up some space, but this is not a long-term solution.

When one drive runs out of space, extending the volume by changing the partition size is preferable. Otherwise, you keep on receiving storage full notification along. 

This article will look at the methods to extend C drive Window Server 2019/2016. We will utilize Disk Management and server disk manager to extend the drive. Aside from that, we'll recommend a third-party program for quick and error-free volume expansion. You should be able to determine the best way to increase the size of your C drive by the end of this article. Let's take a closer look at the details.

Can We Extend C Drive in Windows Server 2019/2016? 

The partition size can be extended in Windows Server 2019/2016. Windows Server users want to extend partitions because the C drive storage is almost full. More space is needed to increase the storage capacity of the C drive. Besides that, the unallocated space in other partitions is utilized through it. Therefore, it helps in the better organization of data. 

 The preferable method to avoid such a problem is by allocating some space. You can extend the C drive by taking the unallocated space from the other volume. If other volumes have sufficient unallocated space left, you can allocate that space. If your C drive is low in space, it will impact your overall system's performance. The system speed will ultimately slow down to the point that it causes hindrance in performing your tasks.  

Extend C Drive on Windows Server with Disk Management 

The Windows server can extend the C drive With its default feature, disk management. It is a built-in utility that allows you to create, remove, reduce, and expand partitions on Windows servers. For example, you may utilize disk management to increase the partition on Windows Server 2016/ 2019. 

Note: Before you begin extending the partition, it is recommended to have complete data backed up. 

To extend partition form disk management, the step is listed below: 

Step 1. Go to the start menu. Right-click and select disk management. 

Go to Start Menu and Open Disk Management

Step 2. Now, select the drive with unallocated space to allocate it to the C drive. Right-click on the drive and select Delete Volume. 

Right Click and Select Delete Volume 

Here we have selected the D drive. 

Step 3. Now, select the C drive. Right-click and choose Extend Volume.

Select C Drive Right Click and Select Extend Volume 

Step 4. An extended volume Wizard will appear. 

Step 5. Enter the amount of MB you want to allocate to C drive. 

Step 6: Click on Finish to complete the process. 

On Extend Volume Wizard Click Next

Step 7: The space is allocated to C drive. 

Can't Extend C Drive on Disk Management? Use Alternative 

You may be unable to extend the C drive in Disk Management at times. To extend C Drive, you can utilize the alternative. We'll start by looking at why you can't expand C Drive in Disk Management. The following are the reasons:

  1. 1. No adjacent unallocated space 
  2. 2. Disk Management does not support FAT32, exFAT, EXT partitions 
  3. 3. No unallocated space on your drive 
  4. 4. The partition capacity has reached the 2TB limit on MBR Disk 

If you've encountered any of the problems listed above, we have a solution for you. EaseUS Partition Master Enterprise is a viable solution. This utility is a perfect way of keeping the C drive extended. The tool is easily accessible via its website. The following are some of EaseUS Partition Master Enterprise's features:

  • It is capable of extending system partition in just one click 
  • It is a comprehensive disk manager that can resize/move, format, delete, copy files easily 
  • Provides professional Tech support 
  • Capable of enhancing and improving partition recovery 
  • Optimize disk usage and allow you to make the best use of available storage capacity 
  • Easily restorable to the previous state if any partitions are interrupted

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The user interface of EaseUS Partition Master Enterprise is simple and intuitive. The procedures to partition a drive are self-explanatory enough that a beginner can partition a disc in a few easy steps. Aside from that, using this program is risk-free. It not only protects data but can also restore files and folders if there is an interruption during the partitioning process. A free trial is also available, allowing you to download and check it out for yourself. So try this tool out for yourself and see what you can find.

How To Extend C Drive by Server Disk Manager (without Data Loss) 

To extend C drive by Server Disk manager, you need to back up your data first. After that, you select the drive that thave unallocated space in it. Use the default Windows server manager and click on delete volume on the unallocated drive. You must delete the partition to avoid the unallocated space to grey out. Then right-click and select extend volume. Now the unallocated is allocated to C drive where is the disk space was running low. 

Option 1. Extend System C drive with unallocated space

  1. 1. Right-click on the System C: drive and select "Resize/Move".
  2. 2. Drag the system partition end into the unallocated space so to add it to the C: drive. And click "OK". 
  3. 3. Click "Execute Task" and "Apply" to execute the operations and extend the C drive.

Option 2. Extend System C drive without unallocated space

  1. 1. Right-click a big partition with enough free space on the system disk, select "Allocate Space".
  2. 2. Select the system drive at the Allocate Space From (*) To section, and drag the end of System C drive into the unallocated space. Click "OK" to confirm.
  3. 3. Click "Execute Task", it will list the pending operations, and click "Apply" to save the changes and extend the C drive.

0:00-0:26 Extend System Drive with Unallocated Space; 0:27-0:58 Extend System Drive without Unallocated Space.

Video Tutorial

This video concludes these two effective ways that help to extend C drive on Servers. If you wish to follow a video guide, here is it:


To summarise what has been said so far, expanding the C Drive is achievable utilizing the PC's default feature. In most cases, the system can build a partition without error when the system cannot generate partitions for the reasons stated above. In these situations, using a third-party utility is the best option. EaseUS Partition Master Enterprise is a good option. This helpful tool allows you to create divisions with a single click. It safely creates the partition and assists you in completing the work quickly. Have a look at EaseUS Partition Master Enterprise and see what you think.

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About the Author

Updated by Roxanne

Roxanne is one of the main contributors to EaseUS and has created over 200 posts that help users solve multiple issues and failures on digital devices like PCs, Mobile phones, tablets, and Macs. She loves to share ideas with people of the same interests.

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Written by Tracy King

Tracy became a member of the EaseUS content team in 2013. Being a technical writer for over 10 years, she is enthusiastic about sharing tips to assist readers in resolving complex issues in disk management, file transfer, PC & Mac performance optimization, etc., like an expert.

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