C drive full Win10

How to fix Windows 10 C drive full issue?

Computer hardware price is much cheaper nowadays, so many Windows 10 computers use hard disk with terabytes of space, but most of people use the large disk for backup and data. To improve computer performance, many people use Solid-State Drive (SSD) for Operating System and applications, because the read and write speed is much faster than traditional mechanical hard disk. Whereas, it causes a big issue that C drive getting full quickly.

When C drive is full in Windows 10, it display as red to alert computer users, because it cause many problem if C drive becomes full. For example: Operating System runs much slower, stuck, reboot unexpectedly or even crash.

C drive full Win10

Many Windows 10 users feedback C drive full but do know proper solution. In this article, I’ll introduce how to fix Windows 10 C drive full issue completely.

What is taking up space in C drive?

There are so many files that may take up space in C drive. C drive full on Windows 10 could be caused by Windows or 3r-party applications.


It could be divided into 3 types of files:

1. Windows Updates

Due to technical bugs, security threat and other reasons, Windows automatically download and install Updates continuously. This is the top factor that cause C drive getting full, because there will be many and large Update files accumulating in C drive if you do not free up space.

2. Windows service

Windows service such as Paging File, Hibernation, Backup and Recycle Bin could take up several GBs space of each.

3. Other Windows files

Other files such as temporary, cache and logs are with small size but could be in large amount.


1. Installation 

The more applications you install, the less free space left. Some applications also eat up free space quickly, such as: Games, Projects, Graphic and Videos.

2. Default output path

Some people like to use default settings for installation and daily usage. It is not a good habit, you’d better install applications to other volume such as D, and change the default output path to other volumes that is in large size.

How to fix C drive full in Windows 10?

To solve this problem completely, there are 3 steps you should do:

  1. Expand C drive to larger size
    With professional partition software, you can extend C drive by taking free space from other drives in the same disk. So Windows 10 will back to the right way and there will be plenty of free space in C drive again without doing anything else. This step is important especially for the computers that C drive are created small.
  2. Free up disk space
    Windows built-in Disk Cleanup can delete many types of unnecessary files safely and easily, so you can reclaim disk space. This step is useful to the computer that never did this operation.
  3. Use computer in right way
    Running computer correctly is not only helpful to fix C drive full issue, but also helpful to improve computer performance.

1. Expand C drive to larger size

Note: there is system damage and data loss risk if you use some unreliable partition software.

Equipped with powerful 1 Second Rollback technology, NIUBI Partition Edition can ensure system and data intact. If something goes wrong during the whole process, your computer can recover to original status automatically and rapidly. It is the first choice to resize and manage disk partitions.

Download NIUBI Partition Editor and follow the steps in the video.

2. Free up disk space

If you want to get more free space in C drive, freeing up to reclaim disk space is a good choice. Windows 10 native Disk Cleanup is good utility to help delete the unnecessary files.

  1. Open Windows Files Explorer, right click C drive and click Properties.
  2. Click Disk Cleanup.
  3. Click the check-box in front of the files that you want to cleanup and click OK.Select files
  4. Confirm this operation by clicking Delete Files.Confirm deleting
  5. Disk Cleanup will back to the files selection window when it complete. Click Clean up system files and then select the files to free up again.

Besides running standalone Disk Cleanup manually, I suggest you turn on Storage Sense, which can free up disk space automatically.

  1. Right click Windows on bottom left corner and select System, click Storage. Click the switch to turn on Storage Sense.Disk cleanup
  2. Click Change how we free up space below this switch, select the Temporary Files.Select files

Change the way running your computer

To permanently solve C drive full in Windows 10, besides the steps above, you’d better change the way running your computer, too.

  1. Run Windows Cleanup as monthly maintenance utility.
  2. Install new applications to other volume instead of C drive.
  3. Change the output path of the applications to other large volumes.

In Windows 10, there is new storage setting which is useful. Right click Windows on bottom left corner and select System, switch to Storage. Click Change where new content is saved.

Change location

Change the default settings and click Apply.

Change settings

In Summary

To fix C drive full in Windows 10: expand C drive as large as possible, reclaim disk space with Disk Cleanup, free up disk space automatically or manually once a month. Furthermore, install applications and change output location of installed applications to other large partition.

Windows 10 C drive full solution
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