content: What do you mean by superfetch eating up 1tb? It indexed 1tb? It filled 1tb with a file?   I don't know what happened, tried to analyze that drive where the disk space went but found nothing.  But it went clearly down fast https://slimgur.com/image/B63 at the moment Windows 10 was doing something on it.  At that moment I did not know about superfetch. Also Windows 10 never did this before since I installed it.