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2023 Tips to Fix 100 Disk Usage in Windows 7/8/8.1/10/11

Updated by Tracy King on Feb 22, 2023

"I have a fairly new hard drive, but my computer is extremely laggy, so I checked disk activity, and it's almost always at 100%."

Top 5 Ways to Fix 100 Disk Usage in Windows 7/8/8.1/10/11

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

Workable Solutions Step-by-step Troubleshooting
Fix 1. Check and Fix System Error Open EaseUS Partition Master on your computer. Then locate the disk...Full steps
Fix 2. Reset the Virtual Memory Press Windows key + Pause/ Break key at the same time. Then choose...Full steps
Fix 3. Stop Windows Service Press Windows + R or type Run in the Windows 7 search box. Type services.msc...Full steps
Fix 4. Clean Up System Files Download and install EaseUS CleanGenius. Select "Cleanup"...Full steps
Fix 5. Upgrade Your HDD/SSD Open EaseUS Partition Master. Right-click the disk that you want to copy or clone...Full steps

How to Tell Windows 7 Disk Usage Situation

It's highly necessary to check the disk usage situation before finding out why the disk is fully used. Follow and check the disk usage situation now:

Press CTRL+ALT+DEL > Right-click Taskbar > Select Task Manager > Tap Processes

Windows 7 100 disk usage

If some useless programs are taking space in Windows disk, select it and click "End Task" to stop it from running right away. And then, you can figure out how to fix the "disk 100% used" issue. Here are some recommended methods for you to fix and solve the disk 100% usage issue in Windows 10/8/7.

Fix 1. Check and Fix System Error to Fix 100 Disk Usage

The very first thing you need to do is check your disk errors. In some cases, the 100% disk usage can be caused by unknown system errors. You can use the CHKDSK command to check and fix disk errors or use third-party disk repair software - EaseUS Partition Master. With it, you can check and fix disk errors with simple steps.

  • Increase C drive space.
  • Resize/move, merge, clone partition, and check file system error.
  • Clone disk, convert to MBR/GPT, convert to dynamic/basic, and even wipe data.
  • Migrate OS, increase partition space, and more

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Step 1. Right-click the target partition that has a problem.

Step 2. Choose "Advanced" > "Check File System".

Step 3. Confirm if you want to hide the partition or not.

Step 4. In the Check File System window, check the "Try to fix errors if found" option.

Step 5. Click "Start" to check errors on your partition.

Fix 2. Reset the Virtual Memory If Windows 100% Used

Virtual memory is a combination of RAM and hard disk space. It is one of the possible causes behind the 100% disk usage issue. If your computer still has a 100 disk usage problem, you can reset virtual memory to fix it.

Step 1. Press Windows key + Pause/ Break key at the same time. Then choose Advanced System Settings on the left panel.

reset virtual memory to fix 100 disk usage windows 7 -1

Step 2. Go to the "Advanced" tab, then click "Settings". 

Step 3. Go to the "Advanced" tab again, and choose Change in the Virtual memory section. 

reset virtual memory to fix 100 disk usage windows 7 -2

Step 4. Make sure that the Automatically manage paging file size for all drives checkbox is NOT ticked.

Step 5. Select your windows drive (the hard drive or partition that has Windows installed on it – usually C:), and enter an Initial size and Maximum size for your virtual memory: 

reset virtual memory to fix 100 disk usage windows 7 - 3

Once you've entered your virtual memory values, click Set, then click "OK" to continue.

Fix 3. Stop Some Windows Service to Fix Windows 7 100% Disk Usage

If Fix 2 fails, you may need to disable some of the mysterious, cumbersome background services in Windows like Superfetch.

Step 1. Press Windows + R or type Run in the Windows 7 search box. Type services.msc into the "Open" box and click the "OK" button.

Step 2. Now find "Superfetch". Right-click it > select "Properties" > click "Stop" on the pop-up windows > click "Disabled" from the 'startup type' drop-down menu.

stop some windows service to fix 100 disk usage windows 7

Fix 4. Clean Up System Files to Speed Up Windows 7

If Windows is running slow, you can clean up system files to speed it up. You can manually clean up system files or using a light-weight cleanup software. Here are the steps:

Step 1. Download and install EaseUS Partition Master Suite.

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Windows 11/10/8/7100% Secure

download and install CleanGenius

Step 2. Click PC Cleaner and install EaseUS CleanGinus. Then, click "Cleanup" and click "Scan" to start cleaning up the system and make your PC as good as new.

system cleanup step 1

Step 3. The software will scanning all over your computer to find idle data files that take a huge amount of disk space, you can select useless large files, system junk files and Windows invalid entries and click "Clean" to start system cleanup process.

system cleanup step 2

Step 4. When the scan is complete, click "Done" to finish cleaning system junk files.

system cleanup step 3

Fix 5. Upgrade Your HDD/SSD to A Bigger One

If none of the solutions work, you can upgrade your SSD or HDD to a bigger one. EaseUS Partition Master can help you replace the hard drive or SSD with a new one without taking the time to reinstall the Windows operating system. 

Make sure the destination SSD or HDD has unallocated space to hold all contents from the source disk. Back up necessary data on the destination disk because everything will be deleted during the process.
 If the partition tables of the source disk and destination disk are different, you need to ensure your PC motherboard can support the boot mode that the destination disk requires. Otherwise, you ought to convert from MBR to GPT or GPT to MBR in advance.
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Step 1. Select the source disk.

  • Click the "Clone" from the left menu. Select the "Clone OS Disk" or "Clone Data Disk"  and click "Next".
  • Choose the source disk and click "Next".

Step 2. Select the target disk.

  • Choose the wanted HDD/SSD as your destination and click "Next" to continue.
  • Read Warning message and confirm "Yes" button.

Step 3. View the disk layout and edit the target disk partition size. 

Then click "Continue" when the program warns it will wipe out all data on the target disk. (If you have valuable data on the target disk, back up it in advance.)

You can select "Autofit the disk", "Clone as the source" or "Edit disk layout" to customize your disk layout. (Select the last one if you want to leave more space for C drive.)

Step 4. Click "Start" to start the disk cloning process.


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. If you still have 100 disk usage problems like Windows 10 Microsoft Compatibility Telemetry high disk usage, or Antimalware Service Executable high CPU usage, you can also ask EaseUS for help.

100% Disk Usage in Windows 7/8/8.1/10/11 FAQs

You can get additional help here if you read on.

How do I reduce disk usage in Windows 7?

To reduce Windows 7 disk usage:

  • Move the temp files
  • Disable the paging file
  • Symlink the Windows update download folder

Why my disk usage is high?

If you consistently see a very high disk usage, it means there is something else going on that isn't quite right. You can right-click the Start button, and select Task Manager, or you can press CTRL + SHIFT + ESC.

What is taking up space on my hard drive Windows 7?

To see what is taking up space

Step 1. Show hidden files on the hard drive

Step 2. Analyze hard drive and find what's eating up hard drive space

How many GB should windows 7 take up?

1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit) 16 GB available hard disk space (32-bit) or 20 GB (64-bit).

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About the Author

Updated by Tracy King

Tracy joined in EaseUS in 2013 and has been working with EaseUS content team for over 10 years. Being enthusiastic in computing and technology, she writes tech how-to articles and share technical solutions to resolve Windows & Mac data recovery, data backup, partition management, data transfer, Windows update issues, etc.

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Product Reviews

Product Reviews

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  • 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. I also think the overall look and feel of EaseUS Partition Master Free makes whatever you're doing with your computer's partitions easy.

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  • Partition Master Free can Resize, Move, Merge, Migrate, and Copy disks or partitions; convert to local, change label, defragment, check and explore partition; and much more. A premium upgrade adds free tech support and the ability to resize dynamic volumes.

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  • It won't hot image your drives or align them, but since it's coupled with a partition manager, it allows you do perform many tasks at once, instead of just cloning drives. You can move partitions around, resize them, defragment, and more, along with the other tools you'd expect from a cloning tool.

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