There are number of ways to free up valuable space if your PC is running low. Best way is to get rid of all the junk files by using the software such as CCleaner. You can also try to uninstall unwanted software and by extending your system partition size.
If you have tried all the methods mentioned above you can try compressing the OS feature in Windows 10 to free up considerable amount of space. This will compress all the files and folders that are part of your OS but unlike the NTFS compression it will not degrade your system performance.
Although this method is safe, it is recommended that you do create an image backup of Windows 10 in case things go wrong.
Compress Windows 10 OS to free up disk space
Step 1: Open Command Prompt as administrator. Type CMD in the search bar, right click on the results and then click Run as administrator.
Step 2: Before actually beginning to compress the operating system, it’s a good idea to check the status of the compact state. In the elevated Command Prompt, type the following command and press Enter key to know the status of the compact state.
The message “The system is not in the compact state because Windows has determined that, it is not beneficial for this system” indicates that Windows 10 is not compressed using compact OS feature. The tool is showing “not beneficial for this system” likely because Windows 10 was installed on large drive.
And if compact state is enabled, you will get “The system is in the compact state. It will remain in this state unless an administrator changes it” message.
Step 3: Now to compress the Windows OS, type the following command and press enter.
Depending on the size of the data on drive where Windows 10 is installed and your PC’s hardware configuration, Windows might take up to an hour to complete the job. Once done, check the drive properties to know how much space you gained by compressing Windows 10 OS.
You should be able to free up at least 2 GB of free space by compressing the Windows 10 operating system.
Uncompress Windows 10 install
To turn off compact state feature and uncompress Windows 10, execute the following command.
Compress Windows 10 using NTFS compression method
As mentioned earlier, compressing OS files may degrade Windows 10 performance. We recommend to use other ways to free up some space on the system drive.
Please note that this NTFS file compression feature is available only if the drive where Windows 10 is installed is using NTFS instead of other file systems. To check the file system type, right-click on the drive, and then click properties.
Step 1: Open File Explorer, right-click on the drive where Windows 10 is installed and then click on Properties.
Step 2: Under the General tab, check the box labelled Compress this drive to save disk space, and then click Apply button.
Step 3: When you see the following confirmation dialog, make sure that the select option labelled Apply changes to drive, subfolders, and files before clicking OK button.
Once the compression is done, all files and folders on your Windows 10 drive will have blue icons as shown below. These icons also appear on files and folders on the desktop.
To uncompress Windows 10 install drive
Step 1: Right-click on the drive where Window 10 is installed and then click Properties to open drive’s properties dialog.
Step 2: Under the General tab, deselect the option labelled Compress this drive to save disk space and then click Apply button.
Step 3: When you see the following confirmation dialog, click OK button.