How to free up disk space in Windows Server 2012 (R2)

The longer you running the server, the less free space left in system C: drive. Windows updates, system service, applications, cache and many other files eat up the free space very fast. One day, the system C drive will become full and change to be red after opening Explorer.

C drive red

In this situation, you’d better free up disk space in Windows 2012 server as fast as possible. Otherwise, this server will become slow, stuck or even crash if C drive is completely full. To free up space on C drive in Windows Server 2012, you may either use the native Disk Cleanup tool or third party system optimization software. But, I always suggest Windows native Disk Cleanup, because it is safe, fast and able to clean up most types of junk files.

Unlike other Windows versions, Disk Cleanup in Windows Server 2012 is not enabled by default. When you right-click the low disk space C drive in File Explorer, you won’t see the Cleanup button.

no cleanup

If you try to start from Run, you’ll receive the error: Windows cannot find ‘cleanmgr’. Make sure you typed the name correctly, and then try again.

cleanup error

Before free up disk space in Windows 2012 server, you should enable or install Disk Cleanup utility.

How to add/enable/install Disk Cleanup in Windows Server 2012

Step 1: Click Server Manager on bottom left, click the 2nd option “Add roles and features“.

server manager

Step 2: Click Next till you see the Features.

Add roles

Step 3: Click the check-box in front of “Desktop Experience” and click Next.

Select to install

Step 4: Within several minutes, the installation complete, click Close.

Install complete

Step 5: Restart the server to finish adding features.


After booting to desktop, when you right click C drive in Explorer, you’ll see Cleanup utility.

disk cleanup

Another way is pressing WindowsR on keyboard to start from Run, type cleanmgr, Disk Cleanup will be launched.


How to free up space in Windows Server 2012 R2

Step 1: use either method above to open Disk Cleanup.

select files

Step 2: click the check-boxes of the files that you want to delete and click OK. Click each type of files, you’ll see the corresponding description on the bottom. In general, all types of files can be selected to remove safely. However, you’d better read the description and then decide to delete them or not.

Step 3: Confirm if you want to clean up these files.

Step 4: repeat from step 1 and click Clean up system files in step 2.

Windows Cleanup utility is a great tool to help free up disk space in Windows 2012 server. It is able to clean up many types of files, such as Temporary Internet Files, files in Recycle Bin, Temporary files, Log files, Thumbnails and Windows Error Report files. I do not suggest deleting files with 3rd-party software, because some people reported mess-up after using these software.

Extend C drive after freeing up disk space

A server administrator who has more than 15 years experience says that the best idea to fix low disk space issue is expanding C: drive, why?

  1. It costs too much time to remove all unnecessary files.
  2. In most cases, you won’t get large amount of free space.
  3. There’s potential risk of losing data or messing up the server if you try some methods that you are not familiar with.
  4. The server runs low disk space again in a short time.

With safe partitioning software, you can extend the C drive by moving free space from other partitions. Your Operating System, programs and anything else keep the same with before.

Video guide to increase C drive free space


Better than other tools, NIUBI Partition Editor has unique 1 Second Rollback technology, it is able to automatically reverts the server to original status in a flash if any known error occurs. Virtual Mode and Cancel-at-well technologies help you cancel wrong operations. In addition, it is 30% – 300% faster because of its advanced file-moving algorithm. Besides resizing partition and expand C drive, it helps you do many other disk partition management operations.

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