By AOMEI / Last Updated May 15, 2020


“My computer hard drive is getting full day after day. Recently, I can’t restore some programs on it, and some partitions become red. Besides, sometimes, I receive a Low Disk Space warning as “You are running out of disk space on Local Disk (C:) To free space on this drive by deleting old or unnecessary files, click here.” How to fix this issue?”

Red Color Bar

What are the consequences of C drive showing full?

Many Windows users have this problem: “My C drive is full without reason”. When C drive showing full, you will notice the red partition bar appeared. You may also receive a low disk space warning. It is not only means that you will run out of C partition space, but also your computer will run slowly for a long time. When system drive is in low disk space, some programs may not work properly, and the booting time may become longer and longer. Hard disk drive is not big enough to accommodate all your needs, such as software update/upgrade, install programs. And you cannot store more data/files on it. What’s more, it may cause the system to crash. Whatever the consequence is, all situation nearly can make users crazy. And you need to fix this problem as soon as possible.

Why C drive full in Windows 10/8/7?

And then it is possible that you are wondering: Why my hard drive full in Windows 10/8/7? What is taking up space on my hard drive? Actually, the main reason about the low disk problem is that C drive is almost fully occupied by large number of files with very little free space. Page files, previous Windows installation, temporary files, and other system files may have taken up the space of your system partition. Besides, you may have saved too many applications or large files to C drive that you are not aware of. Such as the default download folder is located in C drive. So, what should we do to solve such an issue in Windows 10/8/7?

Solutions of C drive full Windows 10/8/7

How to solve C dive is full in Windows 10/8/7? Here provides you several methods to solve this problem.

Method 1. Clean disk

You can empty your C drive by clean it up.

1. Click “Start”, type “disk” in the search box and select “Disk Cleanup”

2. In the “Disk Cleanup”, select the drive you want to clean up. Here is C drive. Click “OK”.

Select C Drive

3. After that, it will calculate how much space you will be able to free on C drive.

4. And then, choose to delete files you do not need.

Method 2. Delete hibernate file

Windows reserves about half of the RAM space for the hibernation file. If your computer RAM is 8GB, the hibernation file is about 4GB in size.

To delete the hiberfil.sys file:

1. Go to Start menu, type “cmd” and right click on the results Command Prompt and select Run as administrator.

2. Then type “powercfg.exe -h off” and press Enter.

After that, you should see a few more gigabytes of free space on system drive.

Method 3. Uninstall some programs

Windows has many built-in programs, especially in Windows 10. You may never use some of them. Then you can uninstall the programs that you do not actually need. And you can also install the programs that won’t be needed in the future to free up space.

1. Click (right click in Windows 10) the Start button.

2. Then click “Control Panel” > “Programs” > “Programs and Features”.

(In Windows 8/8.1, you can type “uninstall” and then select Programs and Features from the results.)

From there, you can right click on the program you want to uninstall and select Uninstall.

Method 4. Delete temporary and downloaded files

You can delete temporary files without running Disk Cleanup. The temporary files usually stored in “C:\Windows\Temp”, or “C:\Documents and Settings\username\Local Settings\Temp”. The files in both folders can be deleted directly.


Method 5. Delete Internet temporary files

Do following steps to delete Internet temporary files:

1. Open Internet Explorer (IE), click “Tools”, select “Internet Options”.

2. Then, it will pop up the “Internet Options” window. Click “Delete”, and it will pop up “Delete Browsing History” window, where you can choose to delete temporary files, history, cookies, etc.

Delete Internet Temporary Files

Method 6. Empty the Recycle Bin

Recycle Bin, a temporary storage place, is used to store deleted files. To be specific, when you delete a file or folder on your PC, it doesn't get permanently deleted—it goes to the Recycle Bin. Therefore, you can free up space by tapping or clicking Empty Recycle Bin if you have files there. However, this way can only free up a bit of disk space for C drive since large files or folders won’t go to Recycle Bin.

Method 7. Use a third party software to extend system partition without data loss

If after all these steps above, your C drive is still full, you can add some space to system partition from another partition on the same hard drive. In this case, you can turn to a powerful third party software to extend your C drive without delete the partition behind it. Here I highly recommend AOMEI Partition Assistant Professional – a magical partition assistant which provides you many useful functions like allocated free space/merge partition. You can use it to manage partition in Windows 10/8/7 easily without data loss. And the specific steps are as follows:

Situation 1: C drive full but D drive empty

If your C drive is full but D drive is empty, you can use the free space the free space in D drive to extend C drive.

Step 1. Install and run AOMEI Partition Assistant. Right click the D drive and select “Allocated Free space”.

Allocated Free Space

Step 2. In the pop-up window, you can allocate free space from D drive to C drive. Then, click “OK”.

Extend C Drive

Step 3. Finally, click “Apply” > “Proceed” to execute the progress.

Situation 2: C drive full, but there is unallocated space on the hard drive

If your C drive is full, but there is unallocated space on the hard drive, you can extend the C drive with the unallocated space.

Step 1. Launch AOMEI Partition Assistant, right click the C drive and click “Merge Partitions”.

Merge Partitions

Step 2. In the pop-up window, tick the unallocated space to add it to the C drive.

Add Unallocated Space to C Drive

Step 3. Click “Apply” > “Proceed” to complete this operation.


Follow these simple steps, you can effectively solve the problem about C drive full in Windows 10/8/7. AOMEI Partition Assistant is such a powerful partition manage tool, it also has many other useful functions like resize partition, create/move/delete/format partition, Make bootable media, rebuild MBR, copy disk, migrate OS to SSD and so on.