How to Fix 100% Disk Usage In Windows 10 and Windows 11
100% Disk Usage is a symptom of two features of Windows not working as intended for the user: SuperFetch and Indexing.
SuperFetch is a system of RAM management that preloads your installed memory with your most frequently used programs. It's designed to improve performance, though some gamers and specialist users have claimed to notice speed gains after disabling it.
Generally speaking it is a good idea to turn Windows Search indexing off if you don't search often, or use a different desktop search program for that instead. Turning off indexation does not mean that Windows Search won't work at all, it just means that it may be slower when you run searches.