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

Tracy King updated on Sep 10, 2020 to Partition Manager | How-to Articles

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

Tip: Do remember to create a 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

Sometimes, a 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.

1. Check and fix system error

Professional partition manager software - EaseUS Partition Master Free will help with the job. It also allows you to check system errors easily.

Download Now

 Windows 10 is supported


Step 1: Open EaseUS Partition Master on your computer. Then locate the disk, right-click the partition you want to check, and choose "Check File System".

Check Partition - Step 1

Step 2: In the Check File System window, keep the "Try to fix errors if found" option selected and click "Start".

Check Partition - Step 2

Step 3: The software will begin checking your partition file system on your disk. When it has completed, click "Finish".

Check Partition - Step 3

You may also directly apply this software to find and delete all useless large files in your PC so as to free up more usable space on your PC.

2. Clean up junk files and optimize Windows

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

click system cleanup

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

analyze junk files

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

Method 3. Stop/disable Superfetch service 

Superfetch service may sometimes cause disk performance issues 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 the 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 

Windows app like Skype or browsers such as Google Chrome may cause a 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 a big available space to store more useful data then.

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Frequently Asked Questions

Why Choose EaseUS Partition Master?

"I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions."PCWorld

"Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available."TECH ADVISOR

"I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes."Lifewire

Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

About EaseUS Partition Master

All-round disk & partition management software for personal and commercial use. Let it manage your storage drive: resize, format, delete, clone, convert, etc.

Video Tutorial

How to Partititon a Hard Drive on Windows 10/8/7