Have you ever experienced sudden sluggishness while working on your Windows 10 PC? Applications are almost freezing, and you just can't do any work. This often happens with old computers and laptops. Even the latest PCs can sometimes face this problem. Nine out of ten times, this sluggishness and freezing happen because of continous 100% disk usage. Culprits can be unnecessary background services or a poorly optimized computer. Today, we'll learn how to address this issue and prevent frequent 100% disk usage. You can apply these methods to other versions of Windows as well. Let's get started!
After going through this guide, system freezing due to high disk activity will be reduced significantly, saving your time and boosting your productivity. You can apply these methods in any order.
All the fixes discussed below are safe to use, and anyone can apply them, even if you are not tech-savvy. Without wasting any time, let's dive in and learn all the quick fixes to stop 100% disk usage problem.
Confirming the 100% Disk Usage Problem
Before you jump to applying fixes for 100% disk usage issue, you must confirm if this problem actually exists on your PC or not. Here's how you can check and confirm this issue.
How to Check 100% Disk Usage Issue?
- Open the Task Manager through the Ctrl + Shift + Esc keyboard shortcut.
- By default, the Processes tab is open. So stay there!
- Now pay attention to the Disk column.
If it is continuously showing 90% to 100% usage, you may be facing this issue.
Why Does Windows 10 Show 100% Disk Usage?
Now, why does this problem occur in the first place? Is it related to inherent system issues or pops up due to some third-party applications? Let's find out the reasons 100% disk usage issue occurs in Windows 10.
- Service overload of SysMain (superfetch)
- Constant background indexing activity of the Windows Search service
- Hidden background processes or a malware infection
- Corruption of hard disk sectors
- Overload of startup services
- Very low RAM triggering high disk activity
- Very old hard drive
Let's address each of these issues and try to find a fix.
1. Disable SysMain (Superfetch)
The SysMain service is used by Windows to preload the most frequently used applications. On low-end PCs, this may cause high disk usage, slowing down the computer.
Disable SysMain Service
Get rid of this service by disabling it. Here are the steps:
- Press the Win + R key combination.
- Type
services.mscin the text field and hit the Enter key. - Scroll down to find the SysMain service.
- Double-click on its entry and open the dialogue box.
- First, click the Stop button.
- Then choose the Disabled option from the dropdown menu.
- Click the Apply and OK buttons in the same order.
- Restart the computer.
This step significantly reduces the high disk activity, and in most cases, resolves the problem.
2. Turn Off Windows Search Indexing
Search Indexing is another Windows feature that may affect your disk's performance. It runs continuously in the background to facilitate quick searching.
Turn Off Search Indexing
The following are the steps to turn off indexing for search:
- Press the Win + R key combination.
- Type
services.mscin the text field and hit the Enter key. - Scroll down to find the Windows Search service.
- Double-click on its entry and open the dialogue box.
- First, click the Stop button.
- Then choose the Disabled option from the dropdown menu.
- Click the Apply and OK buttons in the same order.
Turning this off doesn't disable the search feature. Only the indexing part is turned off.
3. Scan for Malware & Viruses
If your PC is infested with malware, that could be another reason your disk usage is high, non-stop. You can confirm and get rid of this problem by scanning your PC with an antivirus application.
Best Malware Scanning Tools
Although there are dozens of antivirus programs, I'll recommend these two:
- Windows Security (built-in)
- Avast (free version)
Whichever antivirus application you are using, make sure to always run a full system scan to catch and destroy these malware files.
4. Check Disk for Errors
If your disk has bad sectors, it can trigger repeated I/O operations, which result in high disk usage. To fix it, run a full disk scan and repair bad sectors.
Scan and Fix Disk Errors
Here's how you can get rid of this problem:
- Open a Command Prompt window with administrator privileges.
- Type the following command and hit the Enter key:
chkdsk /f /r - Follow the prompts and let the scan get completed.
A full disk scan may take some time, so be patient! After the scan is complete, restart the PC.
5. Disable Heavy Startup Programs
Another common issue is tons of heavy programs starting at boot time. This makes your system sluggish through both high disk usage and CPU time.
Disable Heavy Startup Programs
Here's a simple method to disable heavy startup apps:
- Open the Task Manager through the Ctrl + Shift + Esc keyboard shortcut.
- Switch to the Startup tab.
- Disable all the unnecessary programs by right-clicking on each such entry and choosing the Disable option from the context menu.
Here are some examples of programs you should consider disabling:
- Application background launchers (e.g., Adobe app launchers)
- Gaming application launchers
- Unused or rarely used background tools or services
Addressing this issue results in faster boot times and lower disk usage.
6. Increase Virtual Memory (Must-Do for Low RAM Systems)
If you are using an old computer, chances are high that your system has low RAM. In such a case, opening multiple applications can result in high disk activity as Windows starts using the storage device as the backup memory to free space for active processes.
To counter this, you must increase the size of the virtual memory on disk to decrease I/O operations.
Increase Virtual Memory Size
Follow these steps to increase the virtual memory on your disk:
- Open the search box through the Win + S key.
- Type Advanced System Settings and click the Control Panel entry appearing in the search result.
- Go to the Advanced tab.
- In the Performance section, click the Settings... button.
- A new dialogue box will appear. Switch to its Advanced tab.
- In the Virtual memory section, click the Change... button.
- Uncheck the Automatically manage... option at the top.
- Select the Custom size option.
- For example, if you have 8GB RAM, set Initial size to 12000 MB, and Maximum size to 24000 MB.
- Click the Set button, followed by a click on the OK button.
- Restart the PC.
Now you'll experience less disk activity even if multiple applications are opened on your desktop.
Ultimate Fix: Upgrade HDD to SSD
And last but not least is the final solution of replacing your old hard disk with a new solid-state drive (SSD). Here are the reasons why you must consider this option—seriously.
- SSDs are at least up to 10x faster than regular hard drives.
- Significant reduction in 100% disk usage.
- Blazing-fast boot times.
- Works silently and is more durable than hard disks.
Upgrade today and see the difference!
Conclusion
The 100% disk usage problem happens because Windows 10 runs heavy background services—especially on slower drives.
Most effective permanent fixes:
- Disable SysMain
- Turn off indexing
- Use SSD
Once done, your PC will feel dramatically faster.
