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How to Fix C Drive Filling Up Automatically for No Reason

Posted on Nov 13, 2017 by Jean to Backup Utility

C : Drive keeps filling up automatically without reason? Many users have experienced low disk space on their system drives. Usually, hard drive keeps filling up itself and people don’t know what happen. Don’t worry! This page talks about why C drive keeps filling up and shows you how to free up disk space to fix C drive keeps filling up issue in Windows 10/8/8.1/7.

Why C : Drive keeps filling up randomly?

"I had upgraded to windows 10 about two months ago. But recently, I noticed that my C drive appears to bloat over time with 'low space' warnings constantly. Then I deleted some duplicate files, documents and applications to free up about 50 GB, but, it rapidly fills up again. It seems that something eating up my hard drive. I don't know what cause the problem. Is there any advice about how to fix C drive keeps filling up automatically without reason?"

Reasons and solutions for C drive keeps filling up automatically 

Windows Restore Points 

Windows Restore Points are effectively mini 'backups' of the operating system and are usually created when you install a driver or use Windows Update. It is helpful for disaster recovery but can also eat a tremendous amount of disk space and cause C drive filling up problem over time. This phenomenon is frequently seen in Windows 10 and it is one of the main reasons for Windows 10 C drive full issue. So I highly recommend you to disable the Windows System Protection, clear all the local restore points and then create a system backup image on the external storage device with EaseUS Windows backup software. It is the best way to save disk space and avoid hard drive keeps filling up issue.

To clear local restore points, you can follow these steps: 

Open the System Control Panel applet (shortcut: press [Windows]+[Pause/Break]), click System Protection in the sidebar on the left, select C:, click [Configure], and click [Delete].

EaseUS Windows backup software is a professional backup utility coming with lots of flexible and advanced features. It allows you to automatically backup your system, files, hard drive and Outlook Emails, etc to external storage device. In this case, it is quite helpful to save hard drive space. To backup system partition with EaseUS Workstation backup software, please refer to: How to Backup System with PC Backup Software.

Other possible reasons and solutions for C drive keeps filling up issue

Except for Windows Restore Points, there are some other reasons that can eat away at hard drive space and cause C drive filling up problem: 

  1. File system corruption 
  2. Temporary and Cached Files
  3. Volume Shadow Copy Service
  4. Virus attacks

When the file system gets corrupted, it will report the free space incorrectly and cause C drive filling up problem. You can try to fix it by following steps: open an elevated Command Prompt (i.e. Run as Administrator), execute "chkdsk C: /f /v /x", agree to schedule for reboot, and then reboot your computer, and let it scan while it reboots.
Many programs use temporary and cached files that are stored on the hard drive. Over time, this can eat up a lot of space if you don't clean out your temporary directories. You can free up temporary and cached files from within Windows by accessing the Disk Cleanup. 

1. Click Start and then type in "Disk cleanup" (no quotes).
2. Wait for the Disk Cleanup icon to appear, and then click it.
3. A new window will appear. Choose the C drive from the drop down list.

4. Windows will analyze the drive; the "Disk Cleanup" window will appear.
The first tab labeled "Disk Cleanup" allows you to remove temporary files. The second tab allows you to delete Restore Points and Volume Shadow Copies, including older Windows backups. Both these options can save a significant amount of space.

They are all the possible reasons and solutions that might cause C drive filling up by itself problem. I hope at least one of them are helpful!