It costs less than 10GB disk space to install Windows Server 2012, so many people created a 20GB to 40GB C drive for it when installing. The fact is, even if you create C drive as 60GB to 80GB, it will become full. In this situation, the Operating System runs much slower, no space to install Windows updates, system even crash if there is no free space left.

If less than 1GB free space left in C drive, it becomes red when you open “My Computer” or Windows Explorer.

What to do when C drive becomes full?

When there is not enough free space left in C drive, you’d better solve this problem as fast as possible. Windows also wants to notice the critical issue by changing C drive to be red. 3 steps when c drive becomes full:

1. Right click it and select “Properties”, try to free up some space via the Clean up utility.
2. Back up the Operating System and important data.
3. Extend C drive by taking free space from other data volumes.

To extend c drive, there should be other disk partitions in the same hard disk. Open Windows Server 2012 Disk Management and you’ll see which data partition can be take free space from.

From the screenshot, only 676MB free space left in C drive and there are plenty of unused space in drive E:. Let’s try to add more free space to C drive.

Launch AOMEI Partition Assistant, right click the data partition E and select “Allocate Free Space”.

In the pop-up window, type the value how much free space to take from drive E and select C as the target partition.

Click “OK” and back to main window, press “Apply” button on top left corner to proceed.

Is it easy to add free space to C drive?

If there is no other partitions in the same hard disk, or you cannot get free space from all data drives, you can copy original small disk to another larger one.

Many people have the same issue, such as “C drive is full”, “C drive is running low”, “there is no free space in C”, actually, it is the most common disk partition problem. Relax and follow the steps above, you can solve this problem fast and easily.