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ArkansasQuapaw's avatar
ArkansasQuapaw
Iron Contributor
Jun 24, 2026

Disk usage in Windows 10 often spikes to 100%, causing the system to lag

When I open Task Manager, disk usage often shows 100%, even though I’m not actually reading or writing a large number of files. This causes the system to become unusually sluggish, which is most noti...
KapilArya's avatar
KapilArya
MVP
Jun 26, 2026

Hello,

 

Suggest you to run System File Checker scan to fix possible corruption of system files:

 

  1. Search for 'command prompt' using Windows Search.

 

  1. From results, right click on Command Prompt and select Run as administrator.

 

  1. Type sfc /scannow command and press Enter key.

 

  1. Let the command complete and then reboot the machine.

 

Also, perform clean boot to identify, if any third-party service or program is behind this issue:

 

https://support.microsoft.com/en-in/help/929135/how-to-perform-a-clean-boot-in-windows

 

Additionally, if you're on HDD, I suggest to switch to SSD.

 

Let us know if this helps!