When I saw the picture you posted with the usage at 100%, I got nausea's. I just went through this... for a long time...
Short story here... stop buying HDD. for whatever reason windows 10 is filled with so much crap that hard drives just cant handle it. Buy SSD. Make the SSD your boot drive. Your pc will be good as new.
Long story here:
I litteraly had that issue with my gaming desktop for 2 years. Id give up and then every few months I would be determined to fix it and get to the bottom of it. It happens to so many people and theres are hundreds of forums on this. Theres around 10 suspected culprits causing this. If you google this issue tons of websites are gunna pop up suggesting the same things. Some advice from someone whos done all of them multiple times... when the 100% disk goes away and your pc acts normal for a few days. Prepare yourself.. because its probably coming back. Yesterday I bought a samsung 500GB SSD, $80 from Bestbuy. Threw it in no problem, made it my boot drive, actually decided to keep the HDD since weve been through so much together and BOOM. My pc is absolute lightning with SSD running the show and the HDD just acting as a massive picture and video storage. If you already have an SSD as the boot drive and your hard drive is the back up, just throw it out lol