By Emily / Last Updated May 13, 2021

Scenario: local disk C full in Windows 7

“My C drive has 71.4 GB. After checking the C drive space, I found that I only have 1.16 GB free space. After I clicked into my C drive and added up all the spaces taken up by my Windows 7 and other folders, I found out that I only used about 20 GB of space, which means I have around 50 GB of free space. Now there is not enough space in my C drive to download new programs or applications. Can anyone share C drive full Windows 7 solutions so that I can get more spaces? Thanks!”

C Drive Full

Why is C drive full Windows 7?

Because many programs are downloaded and installed onto C drive by default, previous Windows installation, temporary files, and other system files are still in the C drive, or some virus constantly generates files to C drive, the system partition is easy to get full and then triggers problems. As a result, the Windows operating system will run very slowly even if you have migrated Windows to SSD; and you cannot install new programs or store new data on the system drive.

Six solutions to C drive full in Windows 7, 8, 10

Since C drive full problem will directly affect the computer boot and running speed, it is important to learn how to solve this issue. Here, we would like to share six effective solutions to C drive full Windows 7.

Solution 1. Disable Hibernation

Hibernate is enabled by default to keep the content of your computer’s memory to the hard disk. And the generated hibernate files always take a large amount of space. So you can disable Hibernate to free disk space.

Click the “Start” button and type “cmd”, right click the Command Prompt icon and select “Run as administrator”.In the command prompt window, type “powercfg.exe /hibernate off” and press Enter.

Hibernate Off

Solution 2. PerformDisk Cleanup

Disk Cleanup allows you to remove some temporary files and other unnecessary data that you cannot delete in Windows File Explorer.So performing a Disk Cleanup is also a great C drive full solution.

1. In File Explorer, right click the C drive and select “Properties”. Then click the “Disk Cleanup” option in the window.

2. Windows will scan your C drive and calculate how much space you can free from this drive.

3. Select the files that you wish to delete from the drive, and hit “OK”.

Disk Clean

Solution 3. Turn off System Restore

System Restore is used to restore Windows to an earlier state in time when Windows fails to start. It usually occupies much disk space, so turning it off could release some space:

1. Right-click “Computer” and click “Properties”.

2. In the left pane click “System Protection”.

3. Choose the C drive you want to turn off System Protection, click “Configure”.

System Restore

4. Select the option “Turn off system protection” and click “OK”.

Solution 4. Uninstall some unnecessary programs

Most programs are big and take a lot of space, so you can uninstall those you don’t use frequently. Click “Start”, go to “Control Panel”, click “Uninstall a program” under “Program”, then click “Uninstall a program” under “Programs and Features”, right-click the program that you plan to remove, and click “Uninstall”.

Solution 5. Move Apps from C drive to another larger drive

Apart from uninstalling unnecessary programs from C drive, you can also move some big apps from C drive to another partition with much unused free space, like D drive. However, moving apps from one location to another is not simple as transferring some personal files, like documents, photos, etc. Transferring apps needs the usage of a professional app mover. Here we recommend AOMEI Partition Assistant Professional. You can download its demo version and have a try.

Download Free Demo Win 10/8.1/8/7/XP
Secure Download

Step 1. Install and launch AOMEI Partition Assistant Professional. Click "All Tools">"App Mover".

App Mover

Step 2. Select the C drive and click on "Next".

Select Partition

Step 3. Choose the applications you want to move from C drive, choose the destination drive like D drive and click on "Move".

Tick Apps

Step 4. Click "OK" on the pop-out window to forcefully running applications on the C drive and start moving applications.


Solution 6. Merge unallocated space into C drive

Besides freeing up disk space using methods above, you can also try to extend C drive to make it bigger. Usually, you can use Disk Management tool to extend system partition by right-clicking it and choosing “Extend Volume…”, but the precondition is that there must be an adjacent unallocated space behind the C drive, otherwise the Extend Volume greyed out.

Luckily, AOMEI Partition Assistant Professional can make up the shortage of Disk Management. Whether the unallocated space is behind the C partition or not, the freeware can merge it into the system partition in three steps.

1. Install and open AOMEI Partition Assistant Professional. Right-click the C drive and choose “Merge Partition”.

Merge Partitions

2. In this window, tick C drive and another an unallocated space, then click “OK”.

Check Unallocated Space

3. Back to the main interface, click “Apply” and then “Proceed” to commit the pending operation. This operation requires a reboot after completed.


If there is no unallocated space on the same disk, you can create unallocated space by “Shrink Partition” and “Delete Partition” feature of AOMEI Partition Assistant.
You can also merge two adjacent partitions into a bigger one, but only merge data partition into system boot drive. That is to say, you cannot merge system partition into data partition.

Solution 7. Allocate free space from other partitions to C drive

What’s more, you can directly allocate free space from another partition (ex: D partition) to C drive, which is a simpler, quicker and more convenient C drive full Windows 7 solution.

1. In the main interface of AOMEI Partition Assistant Pro, right-click the D partition and select "Allocate Free Space".

Allocate Free Space

2. Here, you will know how much free space available on the D partition, and you can decide how much space you want to allocate to C drive. After everything is done, click "OK".

Allocate From D To C

3. Back to the main interface, click "Apply" to execute this operation.

Apply Allocate Free Space

If your system disk is full, you can use the "Disk Clone Wizard" of the software to upgrade the smaller system disk to a larger disk.

In Sum

With those 6 different solutions to C drive full in Windows 7, 8, 10, you can easily solve the problem. Worth to mention, AOMEI Partition Assistant Professional comes with Extend Partition Wizard, which can extend NTFS system partition without restarting computer. To extend C drive in Windows Server 2008/2012/2016/2019, you can try AOMEI Partition Assistant Server.