By AOMEI / Last Updated August 13, 2019

Need to extend C drive on Server 2012

C drive, also named as system drive, is an extremely important part on the (Server 2012) computer since the operating system is usually installed on this drive or partition. Besides the operating system, there are also many vital files, such as temporary files, browser caches, downloaded programs, applications, etc being saved on this partition.

As a result, C drive might be running out of space quickly and easily with time going by. Well, when your C drive is almost full and prompts the low disk space alert, what you can do to fix this problem? One of the best solutions is to extend system C drive by adding more free space to it from other volumes. For this task, there are two kinds of tools: Windows native Disk Management and third party partition manager.

Next, I'm glad to show you full solutions with 2 ways to help extend c drive on Server 2012. Select a corresponding tool and method based on your disk partition configuration.

Extend C drive with Server 2012 Disk Management

Disk Management is a built-in tool in Windows Server 2012 for users to manage their disk partitions in a graphical interface. They are safe and easy to use, but they only work under some restricted conditions. To extend the C drive via the “Extend Volume” will require you to delete the partition after the system drive.

Steps to expand C drive in Windows Server 2012:

Step 1. Open Disk Management: press Win+R to open Run program. In the Run dialog, type diskmgmt.msc and press Enter key.

Step 2. Right click the E drive (which locates after C drive) and select “Delete Volume” from the menu.

Delete E Drive

Step 3. After deleting E drive, it will turn into an unallocated space. Now, right click the C drive and select “Extend Volume”.

Extend C Drive

Step 4. In the Extend Volume Wizard, click "Next" to continue.

Extend Volume Wizard

Step 5. Select the disk from which you need to take free space to C drive. And click “Finish”.


Disadvantages of disk management on Server 2012

Although Windows Server 2012 Disk management can shrink and extend volumes, both of them come with restrictions:

  • The “Shrink Volume” function can only make unallocated space on the right after shrinking a volume.

  • The “Extend Volume” feature only functions when the unallocated space is directly behind the target drive you need to extend.

In briefly, the “Extend Volume” option can only add the unallocated space to the left contiguous partition. Therefore, if you want to expand C drive in Server 2012, the only option is to delete the right adjacent volume. As shown above, to extend C drive, you have to delete E drive first. How tiresome! What's worse, it will lead to the disaster of data lose.

Extend C drive on Server 2012 with powerful partition manager software

When the Disk Management lets you down, or if you don’t want to delete partition after the system drive, you can try a professional partition manager tool, which provides an easy and safe way to extend system drive. Our recommendation is AOMEI Partition Assistant Server.

It has a feature called “Extend Partition Wizard”, especially designed for freely and easily extending NTFS system partition without data loss or deleting any partitions. Besides, it does not require you to reboot system after extending C drive on Server 2012.

Steps to extend C drive without rebooting system via AOMEI Partition Assistant:

Step 1. Install Partition Assistant Server Edition and open it. In the main interface, choose the option of "Extend Partition Wizard" to launch it, and click “Next”..

Extend Partition Wizard

Step 2. Here, select “Extend system partition” from the given two options. Click “Next”.

Extend System Partition

Step 3. Choose a partition from which you plan to take free unallocated space. Here we select D drive and hit on “Next”.

Select D Partition

Step 4. In the following window, drag the slider bar to the right to free space, or you can enter a proper value into the Partition New Size box.

Extend C Drive

Step 5. This interface will give us the detailed information about the operation of volumes. Please choose "Proceed" to execute all these operations.


After executing all these operations, you can see the C drive becomes larger, and the system will not reboot.

Advantages of AOMEI Partition Assistant Server

Besides helping you increasing C drive space via the above tool-Extend Partition Wizard, AOMEI Partition Assistant Server also has the below amazing functions to make extending C drive safe and easy.

  • Allocate Free Space: this feature can directly assign some free space from one partition to another one, just within 3 steps.

Allocate Free Space From D To C Drive

  • Move Partition: it is quite useful when there is an available unallocated free space on the same disk but not right after the system drive, since you can move the partition in the middle of the unallocated space and the to-be-extended partition. That breaks out the limitations of Disk Management.

    Move Partition D

  • Merge Partitions: it is able to merge two partitions into one, as well as combine one or two unallocated space into the system partition.

Tick Another Partition


Much better and more versatile than Disk Management, AOMEI Partition Assistant Server can help extend C drive on Server 2012 in several safe and easy ways. How convenient it is! Just several clicks and drags can increase C drive space on Server 2012! Meanwhile, it also supports Server 2019/2016/2011/2008/2003/2000 and Windows 10/8/7/Vista/XP, both 32-bit and 64-bit.