One thing that many people (including myself) have noticed is that hard drive usage in Windows 10 often jumps to 100% and stays there for a while.
One of the reasons for this is automated drive optimization, which runs defrag on schedule. Chances are that you don’t need this, or don’t needed it as frequent. You can either disable scheduled optimization, or change the schedule.
Tap Search and search search for “defrag”. Select Defragment and Optimize Drives desktop app from search results. When the app opens, click on Turn Off under “Scheduled optimization” section. A new window with options will pop up – you can either disable optimization, or change the frequency so that it runs less often.
This should solve your problem with hard disk thrashing under Windows 10. If you are still having the issue, culprit could be one of third party services or background applications that are running on your PC.