By AOMEI / Last Updated July 16, 2019

Not enough space on C drive

Many Windows users may find that the C drive is full without reason sometimes, or the C drive is getting full day after day. The computer may notice you that there is not enough space on C drive. At this time, the C drive will not big enough, and you may not be able to perform software updates/upgrades, program installation. What’s more, the operating system will run slowly. And you cannot store more data/files due to smaller storage space. So, free up the disk space of C drive is necessary.

Why there is not enough space on C drive

Many users may be puzzled about reason of “not enough space on C drive”. What is taking up space on the C drive? In general, the main reason for the low disk space problem is that the C drive is occupied by a large number of files, and the free space is very limited. If you saved large files to C drive that you are not aware of (For example, the default download folder is located in C drive), the space of C dive will get not enough too. Besides, some page files, temporary files, and other system files may take up space on the system partition.

Solutions of “not enough space on C drive” in Windows 10/8/7

Don’t know how to solve the problem of “not enough space on C drive”? Here provides you several solutions to free up the disk space of C drive.

Solution 1. Deleted hibernate file

Windows reserves about half of the RAM space for the hibernation file. If the computer RAM is 8GB, the hibernation file is about 4GB in size. The steps of delete hibernate file is:

1. Go to start menu, type “cmd” and right click it to run as administrator.

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

Then, you will see a few more gigabytes of free space on system drive.

Solution 2. Uninstall some programs

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

1. Click the start button.

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

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

Solution 3. Clean disk

You can also free up space of C drive by empty it.

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. Finally, choose to delete files you do not need.

Solution 4. Extend C drive without data loss

If there is still not enough space on C drive after all the solutions above, you can try the next method. Usually, there will be extra free space on other partitions. And you can add some space to system partition from another partition on the same hard drive. A powerful third party software can help you to extend your C drive without delete the partition behind it. Here AOMEI Partition Assistant Professional is highly recommended, which provides users many powerful functions like allocated free space. With the help of it, you can easily solve the problem about there is not enough space on the disk windows 7/8/10 without data loss. The following example will show you the specific steps of using the free space in D drive to extend C drive:

Step 1.Install and run AOMEI Partition Assistant Professional. 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. And click “OK”.

Extend C Drive

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

Tips: If you encounter the problem c drive full, you can also use another function of AOMEI Partition Assistant – Merge Partition to solve the issue too.


Now, you know to deal with the problem not enough space on C drive. Besides Allocated Free Space, AOMEI Partition Assistant Pro also provides you many other useful functions like Wipe Hard Drive, Partition Recovery Wizard and so on. If you want to install Windows to USB someday, AOMEI Partition Assistant can help you too. If the operating system of your computer is Windows Server, please turn to AOMEI Partition Assistant Server to enjoy more advanced features.