Most Windows 10 users encounter issues like disk usage of 100 per cent, and the speed of the system is going to be degraded. In such cases, you need to take steps to correct it. You can have a look at few methods that you can try to fix the problem of high disk usage in your Windows 10
Updating Windows
Try to install the latest updates as sometimes it solves a lot of issues that occur with the Windows 10 system. Also, check if your system is updated by navigating to the section – “Update and security” from Windows Settings app.
Check if there are any new updates and then install if any.
Settings–Update & Security settings–Windows Update

It can enhance the overall speed of the system, including the hard drive.
Restart the System
Restarting your system can help you resolve a lot of issues related to your system, including 100% disk usage issue too. Well, you may not be able to trace out the reason why this problem occurred using this method, but if the issues are fixed, you win the race.
Remember to use the option – “Restart” which will start your system in altogether a new state as compared to the option – “Shut Down” that protects the system state and may not help fix the disk problem.
Identify Malware
The chances are that your PC is facing a malware attack which is resulting in a high disk usage issue. In case you are using antivirus software operating in the background,it might have identified the problem.
Still, that is not guaranteed, so make your antivirus scan the hard disk to check for possible infection. This will take a little more time as your drive is facing the high usage issue, but the malicious software might get detected at the end of the scanning.
Halt Super fetch Service
This is another useful feature in Windows 10 which can result in issues. Yes, that’s – Windows Super fetch service. The service can be disabled temporarily. To do so, search command – net.exe stop super fetch.