Solved: Low Disk Space Alert on Windows Server 2012 (R2)

March 29, 2019

It is bothering to get Low Disk Space alert showing up when you are working on Windows Server. This article will show you how to fix low disk space issue in detail.

Low Disk Space alert on Windows Server 2012 (R2)

As more and more data saved to your drive on Windows Server 2012 R2, it is possible to get Low Disk Space alert, which means that the Local drive is running out of space. If such alert occurs on C drive, you can find that the speed of operating system boot, application running is more & more slowly; and you may even encounter system crash. By the way, it is annoying to get Low Disk Space warning when you are working dedicatedly.

Fix drive running out space issue on Server 2012 (R2)

Due to negative effects that inadequate free space on Windows Server C drive can cause, it is rather necessary to fix low disk space on C drive problem.

Solution 1. Run Disk Cleanup

Disk Cleanup, a Windows built-in tool, enables you to remove unnecessary files on C drive that are unable to be deleted within File Explorer. Here are detailed steps:

1. In File Explorer, right click C drive and choose Properties among listed options.

2. In the pop-up window, click Disk Cleanup under General tab and it will calculate how much space you’ll be able to free from C drive.

3. Tick the box before the files that you want to delete and then click OK button.


Tip: To avoid removing indispensable files mistakenly, you can click View Files to check what the files are in advance.

If you have not ever used Disk Cleanup tool on Windows Server 2012, you can enable by doing as follows: Go to Control Panel > Programs>Programs and features; click Turn Windows Features on or off and click Add Roles and Features; choose Installation Type and select Role-based or feature-based installation and then click Next; Click Next and Next and you’ll go to Features; locate User Interfaces and Infrastructure, expand it and check Desktop Experience; click Add Features; click Next and Install. After installation, you need to reboot computer.

Solution 2. Increase Partition Size of C drive

If you don’t want to run Disk Cleanup or the existing capacity of C drive is too small, you can choose to extend C drive to fix Low Disk Space alert issue on Windows Server 2012 (R2). To complete such task easily, you can turn to AOMEI Partition Assistant Server. With it, you can merge adjacent or non-adjacent unallocated space into C drive on the same hard drive or allocate free space from one partition to C drive. Now, have a look at how to extend C drive on Windows Server 2012 (Supposed that there is no unallocated space on the same hard drive).

Step 1. Install and run AOMEI Partition Assistant Server. Right click the partition with adequate free space and choose Allocate Free Space.

Allocate Free Space

Step 2. It pops up a window where you can adjust the space that you want to allocate to C drive in the box behind Allocate Free Space: and choose C: in the box behind from (D:) to:. Then, click OK.

Allcoate Free Space from D to C Drive

Step 3. You’ll get back to main console where you can preview the result. Click Apply > Proceed, if you are satisfied.



  • If the hard drive with Low Disk Space alert appearing is not large enough, you can upgrade hard drive to bigger one.

  • It is available to extend C drive in Windows Server 2003, 2008, 2016 and 2019 as well via AOMEI Partition Assistant Server.

  • AOMEI Partition Assistant is with many other powerful functions including converting dynamic disk into basic without data loss, cloning OS drive, rebuilding MBR and etc.

Wrap things up

It is not rare to encounter Low Disk Space alert on Windows Server 2012 (R2) operating system or other Windows Server operating system like Windows Server 2008. When you are in such bothering condition, don’t put the issue aside as you won’t be happy to face the consequences that C drive running out of space can make.