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How to Fix 100% Disk Usage in Windows 11?

If you encounter the situation that your system begins lagging or program respond is slow, it may be caused by the high disk usage in Windows 11.  High disk usage always results in slow computer and lagging system. If you want to solve this problem, you come to the right place. This article will show you how to fix high disk usage in Windows 11.

How to Check Disk Usage in Windows 11?

If your computer response becomes slow, it’s time to check your disk usage. But how could you check your disk usage in Windows 11 to ensure whether the slow computer is caused by disk usage or not.  Firstly, quickly launch your Task Manger by pressing Ctrl+Shift+Esc or searching it in your Start Menu. Then you will see the disk usage under the Process tab in your Task manager.

Check Disk Usage

If the number above Disk is more than 15%, you should pay attention to your system performance and try to find ways to fix the high disk usage.  Because you will obviously experience poor system performance when your disk usage is high, such as programs begin lagging, videos are always loading, and you will take more time to launch all your applications.

Why High Disk Usage?

Before we solve the high disk usage problem, we should know what causes high disk usage. It will help us to fix high disk usage in Windows 11. Generally, there are several reasons.

  • Outdated drivers
  • Some servers hogging the disk
  • Virus infections
  • Too many startup items

Now, you may have a deeper understanding about high disk usage. Next, we will talk about how to fix 100% disk usage in Windows 11.

4 Ways to Fix 100% Disk Usage in Windows 11

in some cases, your disk usage will be high if your system is infected with malware. So, you can run a full scan for your system. If the disk usage is still high, please follow these ways below.

1 Disable Windows Search Service

2 Disable SysMain Service

3 Fix StorAHCI.sys Driver

4 Upgrade RAM (virtual memory)

Disable Windows Search Service

As we all known, windows search service will store the data indexing on your computer in order to get the searching results in a faster speed. it will hog disk usage to result the high disk usage. So, if you want to fix the high disk usage in Windows 11, you can try to disable Windows search service.

Launch the Service app by typing Service in the search bar, and locate the Windows Search service, and then double click on it.

windows search service

Next, click on Startup type drop down menu and choose Disabled in the Windows Search Properties window.

disable windows search service

Then, click on Stop under Service status and next to hit on OK button.

stop running

Now you can restart your PC to check whether you disk usage is lowered or not. If it doesn’t work, then you can go through the following steps.

Disable SysMain Service

SysMain, also named Superfetch, is a service which can pre-load the programs you usually used to improve the system performance. Although it can improve the performance, it also results in high disk usage. So, you can try to disable SysMain service to lower your disk usage in Windows 11.

Search for Services and launch the app. Locate the SysMain service and double click on it to launch the SysMain Properties window.

SysMain Service

Next, hit on the General tab, choose Disabled under Startup type.

disable SysMain Service

Finally, click on Stop button under Service status and hit on OK button.

stop SysMain Service running

Just the same as the first way, now you can restart your Windows 11 to check whether your disk usage is lowered. It is not, please move to the next fix.

Fix StorAHCI.sys Driver

Actually, Windows 11 is inefficient at allowing HDDs to use Native Command Queuing, which usually results in drivers stuck at 100% and system frozen for a long time. So, we can modify the registry to the SATA AHCI controller to solve this issue. Let’s check the steps one by one.

Launch Device Manager, right-click on Standard SATA AHCI Controller under IDE ATA/ATAPI Controllers to open the SATA AHCI Controller properties.

open SATA AHCI Controller

Go to its driver and open its details to check if there’s a storahci.sys file.

driver details

Then, go back to the Details tab and search device instance path. Right-click on to copy it which will be required in the next step.

copy key

Next, launch registry editor app, open local machine, System>ControlSet001>Enum>PCI. Past the copied registry in the previous step in the url and hit enter.

find registry

Now, expand this property in the device parameters, right click on MSISupported key, choose Modify, and set its value to zero. Click OK and close all windows to restart your computer.

set value

Until now, the three methods may help you lower your high disk usage in Windows 11. If they are all ineffective, go through the next method.

4 Set Virtual Memory

Set virtual memory of Windows 11 is also a way to fix high disk usage. Firstly, go to search bar and type performance monitor and click on Adjust the appearance and performance of windows on the left side in the search result windows.

performance monitor

Then hit on Advanced tab in the Performance Options window. Next, click on Change button.

change virtual memory

Uncheck the Automatically manage paging file size for all drives option, then click on Custom size, set the maximum size which is 1.5 times the physical RAM.

reset virtual memory

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