6 Ways to Fix C Drive Keeps Filling Up for No Reason

Jean updated on Jan 14, 2021 to Computer Instruction | How-to Articles

Today I'm going to show you how to fix C drive filling up automatically for no reason step by step. Here is an overview of the solutions.

Workable Solutions Step-by-step Troubleshooting
1. Run Disk Cleanup Open "Start", search for Disk Cleanup and select the top result to open it....Full steps
2. Disable Hibernation Run Command Prompt as administrator. Input powercfg.exe /hibernate off...Full steps
3. Delete System Restore Points Right-click "This PC" and choose "Properties" among the listed results...Full steps
4. Transfer Large Files/Apps You can move large files and applications to another drive without effort...Full steps
5. Extend C Drive Space Launch EaseUS Partition Master. Shrink partition and leave unallocated space for extending C: drive...Full steps
6. Migrate OS to a Bigger SSD/HDD If the disk itself has less space, you can migrate Windows 10 to a bigger SSD...Full steps

Real Case - C Drive Keeps Filling Up

"I have a 235 GB hard drive with very few programs loaded onto it and almost no picture or video files taking up space. The computer is hooked up to a network where I work, but nobody else has this problem. Even if I can free up several GB's of space, the C: drive will fill up in just a couple of days. Is there any advice about how to fix C drive keeps filling up automatically without reason?"

Many computer users complain about C drive full problems on the Internet. They don't store any files on the drive, and even they delete some files, their C drive keeps filling up. Why is C drive getting full automatically?

Reasons - Why C Drive Is Getting Full Automatically

Many factors can cause insufficient C drive space. Here I will list some of the most common reasons.

  • Virus attacks 
  • File system corruption 
  • Enabled Windows restore points
  • Too many temporary and cached files
  • Little free space on C drive...

Before You Start - Back Up Your System and Files

Now that you have learned about the reasons, you can fix the "C drive getting full automatically" issue accordingly. These tried-and-true solutions can solve your problem effectively. But before you start, you are suggested to create a system backup. Because there are some file deletion and cleaning operations on the system partition, you'd better make a system backup.

A system backup is a process of backing up the operating system, files, and system-related data. With the image, you can restore your operating system at any time. EaseUS backup and recovery software provides a one-key function of system backup for Windows 7/8/8.1/10 and the earlier Windows PC operating systems like Windows Vista and XP. 

Your Reliable Choice - EaseUS Todo Backup

  • Schedule your backups in simple clicks.
  • Back up and protect data fast on a Windows-based computer.
  • Restore your system and data instantly once disaster strikes
  Free Download

Support Windows 10/8.1/8/7/Vista/XP

Steps to back up Windows 7/8/8.1/10:

Step 1. Download and launch EaseUS Todo Backup.

open easeus todo backup

Step 2. Click "OS" on the home screen to back up your Operating System (Windows 10/8/7). Then a mini window pops up, it will detect and display the operating system information automatically.

click system backup to back up your operating system

Step 3. Select the backup destination, the software will choose the most suitable location by default.

Step 4. Click "Schedule" option to open the Backup Scheme window, here you can create a scheduled backup plan to back up your OS later, daily, weekly, monthly or upon an event. Then, your OS will be automatically backed up.

click schedule to automatically back up your OS

Step 5. Save all of the changes. Click "Proceed" to start Windows 10 system backup.

Fix 1. Run Disk Cleanup to Fix C Drive Filling Up Problem

After you have made a system backup, you can follow the operations below without worrying about your data. When the C drive keeps filling, you should run antivirus software and then clean up temporary files and other junk files.

  • Open "Start", search for Disk Cleanup and select the top result to open it.
  • Select the files that you want to delete from the C drive or other drives. 
  • Click the "OK" button.

run disk cleanup to fix c drive keeps filling up

If you don't have too much technical know-how, you can run a free tool - EaseUS Tools M to clean up system files with easy steps.

Step 1. DOWNLOAD and install EaseUS Tools M. Select "System Cleanup" on the main screen.

Step 2. Select the type of junk files you want to scan and click "Analyze".

Step 3. Identify and select useless files and click "Clean up" to remove those files from your PC or laptop.

click clean up to remove junk files

Fix 2. Disable Hibernation If C Drive Keeps Filling Up

Generated hibernation files often take up much space on your hard drive. The Hiberfil.sys is a hidden system file located in the drive's root folder where Windows is installed. To turn off hibernation mode, follow the steps below.

  • Run Command Prompt as administrator.
  • Input powercfg.exe /hibernate off and hit "Enter"
  • Type exit, and then press "Enter" to close the Command Prompt window.

disable hibernation mode to fix c drive is getting full automatically

Fix 3. Delete System Restore Points in Windows 10

Windows Restore Points are effectively mini 'backups' of the operating system and are usually created when installing a driver or using Windows Update. It is helpful for disaster recovery but can also eat a tremendous amount of disk space and cause the C drive full problem over time. As I have mentioned before, system restore points are one of the reasons that cause C drive to get full automatically. Thus, you can disable the Windows System Protection to solve the problem.

  • Right-click "This PC" and choose "Properties" among the listed results.
  • On the left pane, choose "System Protection".
  • In the small pop-up window, select "C drive" and click "Configure".
  • In this window, select "Turn off system protection" and click "OK". You can click "Delete > Continue" to delete all system restore points and free up disk space.

disable system restore if c drive is getting full automatically

Fix 4. Transfer Large Files/Apps to Another Drive

If you have installed large games like Steam or Blizzard on your C drive, you might be bothered by C drive full problems. You can move large files and applications to another drive without effort. EaseUS Todo PCTrans moves applications, files, and accounts between computers in 1 click.

related articles

How to Move Large Files From One Drive to Another?

You can transfer files, programs, and games to another drive with simple clicks.

transfer large files to another drive

Fix 5. Extend/Increase C Drive Space

If your C drive is allocated with small space at first, you can use third-party partition manager software – EaseUS Partition Master to extend the C drive without data loss. 

Step 1. Launch EaseUS Partition Master

Run EaseUS Partition Master

Step 2. Add space to the System C drive

1. Shrink partition and leave unallocated space for extending C: drive:

  • Right-click on a partition next to the C: drive and select "Resize/Move".
  • Drag the end of the partition that is next to the C: drive and shrink it, leaving unallocated space next to the system C: drive, and click "OK".

2. Right-click on the System C: drive and select "Resize/Move".

Extend System partition

To add space to the C: drive, drag the system partition end into the unallocated space.

Add space to C drive

Step 3: Confirm to extend system C drive

Click the "Execute Operation" button, it will list the pending operations, and click "Apply" to execute the changes and extend the C drive.

Confirm to extend system C drive

Fix 6. Move/Migrate OS to a Bigger SSD/HDD

If the disk itself has less space, you can migrate Windows 10 to a bigger SSD or HDD. You can follow the guide to migrate Windows 10 to SSD or watch the video below.

Conclusion

That is all there is to it. The best solution is Fix 5 because you can allocate more space to your drive without losing data. If you found one of the solutions useful, I'd appreciate it if you would share it on Facebook. I'd also like to hear from you: have you fixed the C drive automatic full problem? Please send an email and let me know.

  Free Download

Support Windows 10/8.1/8/7/Vista/XP

Was This Page Helpful?