I am tired of reading all these comments, not just here but everywhere on the web.
There is a solution that nobody mention.
Change the bloody hard disk! your hard disk is malfunctioning, that's why you get the 100%. SIMPLE AS THAT!.
Do it. You'll see.
I, and many others here, HAVE replaced their hard drives. Yet the problem persists on the new hard drive as it did on the old one. No matter if the hard drive is an SSD or not.
This is not a hardware problem. This is a Windows 10 problem. People who have downgraded to Windows 7 find the problem goes away, without changing their hard drive. People who abandon Windows entirely, by switching to some other OS, find the problem goes away, without changing their hard drive.