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C drive is full? Low disk space warning? How to free up C drive in Windows 10 ? How to add more free space to C to solve the following issues:
The computer is running slowly.
You cannot store more large files/data on it.
Hard disk drive is not big enough to accommodate all your needs, such as software update/upgrade, install programs.

Here, you can try to delete some necessary files, to uninstall some programs. However, the most effective way to free up C drive is to add space from other drive to C.