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Fix 'Disk Is 100% Used' Issue in Windows 10/8/7

Updated on Jun 13, 2018 by Tracy King to Partition Manager

Windows 10 disk is 100% used? Computer gets stuck or becomes extremely slow when disk is 100% used in Windows 10/8/7? Follow this tutorial article to fix Windows high disk usage (100%) issue with ease now.

Computers or laptops are becoming slower with notice popping up frequently, warning you that disk is 100% used? How to fix the disk 100% used issue and optimize computer performance? Don't let these problems bother you anymore. Here below you'll find effective solutions to fix "Disk is 100% used" issue in Windows 10/8/7 with ease.

Disk is 100% used in Windows 10/8/7.

Quick Fix: Check the disk usage situation and end useless programs

It's highly necessary to check the disk usage situation before you find out the reasons why Disk fully used. Follow and check the disk usage situation now:

  • Press CTRL+ALT+DEL > Right-click Taskbar > Select Task Manager > Tap Processes
  • If some useless programs are taking space in Windows disk, select it and click End Task to stop it running right away.

You can check Disk column so to find out what is taking the most space in your disk. And then you can figure out how to fix the disk 100% used issue. Here below are some recommended methods for you to fix and solve disk 100% used issue in Windows 10/8/7.

Method 1. Run anti-virus software to clean up all virus or malware in Windows with disk 100% used error

In order to avoid virus attack or malware taking too much space in disk and affect your personal data in PC or attack Windows system, it's highly necessary for you to run anti-virus software to clean up all virus or malware in PC. This will also help to wipe out some junk fines in PC.

Tip: Do remember to create system and data backup for your PC in Windows. Professional Windows backup software - EaseUS Todo Backup will make it simple for you to backup system and data.

Method 2. Check system errors and clean up disk junk files to fix Windows 100% disk used issue

Sometimes, disk 100% used issue may be caused by unknown system error. Therefore, check and fix system error in Windows may help solve disk is 100% used issue. Professional partition manager software - EaseUS Partition Master Free will help with the job. It also allows you to clean up all junk files or useless large files in PC so to free up disk space.

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 Windows 10 is supported

1. Check and fix system error

  • Launch EaseUS Partition Master Free and right-click the partition(system partition for preventing system errors) that you want to check by clicking "Check partition".
  • Choose the way that you want to use to check partition: Check Partition Properties, Call Windows Chkdsk to fix errors, Surface Test.
  • Click OK.

Fix system error to solve disk is 100% used error.

2. Clean up junk files and optimize Windows

  • Launch EaseUS Partition Master Free and click Cleanup and Optimization. Then choose Junk File Cleanup.
  • Then you can click Analyze to let EaseUS Partition Master to find junk files in your PC.

Clean up junk files in Windows.

  • You can check and choose junk files and click Clean up.
  • All selected junk files will be cleaned and thoroughly deleted from your PC then.

Clean up junk files to solve Disk is 100% used issue.

You may also directly apply this software to find and delete all useless large files in your PC so to free up more useful space in your PC with the Large File Cleanup feature.

Method 3. Stop/Disable Superfetch service to fix 100% disk usage issue

Superfetch service may sometimes cause disk performance issue due to disk full usage in Windows 10/8/7. Therefore, to stop Supertech service will help fix the Windows disk 100% used issue:

  • Open Command Prompt > Enter net.exe stop superfetch and hit Enter;
  • Run Check Disk and type chkdsk.exe /f /r to see whether the problem has been solved or not.
  • After all this, you can close all applications and then reboot the PC again.

Then you'll get improved PC performance with more available disk space.

Method 4. Change browser and App settings to fix disk 100% used issue

Windows app like Skype or browsers such as Google Chrome may cause 100% disk usage issue. Change browser and App settings may work to fix 100% used of disk problem:

1. Change Chrome settings to fix 100% disk usage problem

  • Open Google Chrome, go to Settings;
  • Show Advanced Settings > Privacy > untick Prefetch resources to load pages more quickly.

2. Change Skype settings to solve 100% disk usage issue

Make sure that the Skype in your PC is not running.

  • Open Windows Explorer and go to: C:\Program Files (x86)\Skype\Phone\;
  • Right-click Skype.exe and click Properties, open Security and click Edit;
  • Highlight All APPLICATION PACKAGES and Tick Write;
  • Click Apply and click OK twice.

After all these steps, your computer with disk 100% used problem will be solved then. You will enjoy an optimized computer with big available space to store more useful data then.