Service Host SysMain high disk usage in Windows 10

Tashreef Shareef
by Tashreef Shareef
Windows & Software Expert
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  • The SysMain process can cause high disk usage in Windows 10, which can stop you from using your PC normally.
  • In this article, we explore a few troubleshooting steps to fix the problem, so make sure to explore it entirely.
  • If you want to explore other useful guides, check out our dedicated Troubleshooting section.
  • Don't hesitate to visit our thorough Windows 10 Hub for more nifty tips and tricks relating to this subject.

If your computer suddenly shows performance issues and starts working slow it is most likely a process is causing high disk usage. Several users have reported Service Host SysMain causing high disk usage issues in Windows 10.

Service Host SysMain (earlier known as Superfetch) is a bundle of system process that includes multiple processes.

In this article, we explore a few troubleshooting steps to help you resolve the service Host SysMain causing a high disk usage issue in Windows 10.

How can I stop Service host SysMain from using all disk?

1. Stop SysMain service

Use Windows Services

SysMain high disk usage

  1. Press the Windows key + R.
  2. Type msc and click OK to open Services.
  3. In the Services window, locate SysMain
    SysMain high disk usage
  4. Right-click on SysMain and select Properties.
  5. Click the Stop button.
  6. Click OK to save the changes.

Open the Task Manager and check the disk usage and see if it is normal. Stopping the SysMain services from Services can help you resolve the high disk usage caused by the process.

If the issue persists, there are two more ways to stop the SysMain service.

Use the Command Prompt

SysMain high disk usage

  1. Press the Windows
  2. Type cmd.
  3. Click on Open Run as Administrator to open the Command Prompt.
  4. In the Command Prompt window, type the following command and hit enter:
    sc stop “SysMain” & sc config “SysMain” start=disabled
  5. You should see Change Service Config Success

Close the Command Prompt and open the Task Manager again to check the disk usage.

Use the Registry Editor

SysMain high disk usage

  1. Press the Windows key + R.
  2. Type regedit and click OK.
  3. In Registry Editor, navigate to the following location:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SysMain
  4. You can copy-paste the above path in Registry Editor to navigate quickly.
  5. In the right pane, right-click on Start and select Modify.
    SysMain high disk usage
  6. Enter 4 in the Value Data
  7. Click OK to save the changes.

Close the Registry Editor and then launch the Task Manager from the Taskbar. Check if the high disk usage issue is resolved.


2. Check your hard drive

High Disk Usage Service Host

If your Windows computer has a traditional mechanical hard drive, consider upgrading to an SSD. Having your Windows installation and other frequently accessed programs in an SSD makes a lot of difference.

Most of the modern laptops come with an M.2 slot to install NVMe SSD. If not, you can buy a separate caddy to install the SSD on your old laptop.

We have an excellent guide to help you find the best 250GB and 500GB SSDs for your PC and laptop.

The high disk usage issue usually occurs when the essential system processes run in the background. However, having an SSD will significantly reduce the chances of getting a high disk usage issue.


3. Update Windows

High Disk Usage Service Host

  1. Click on Start and select Settings.
  2. Go to Update & Security.
  3. Check for pending Windows updates and install them.

Installing the Windows updates can fix the high disk usage issue caused by a glitch in the operating system.

The SysMain is causing high disk usage in Windows 10 issue can make your computer slow affecting the performance of other programs.

We have listed the three ways to disable the SysMain service in Windows 10 to help you resolve the problem.

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