Windows 7 Chkdsk got stuck at 14% many times trying to fix C:\ drive (Seagate SSHD 750GB ). The only tip in the whole net seems to let it work for a day or two until finishes - if ever. Well I was not satisfied with the scenario of using 6 year old ancient Chkdsk anymore and used the tool at https://www.microsoft.com/fi-fi/software-download/windows10 to download Windows 10 to USB thumb drive. Rebooted from thumb, chose Repair to get to the Command Prompt and ran Chkdsk c: /f /r /b /x which indeed completed while immersing myself with Thor: The Dark World.
Win 10 Chkdsk finished (thank goodness for new technologies!) but with an error I've never seen
"an unspecified error occurred (75736e6a726e6c2e 4f6)"
What's going on? Going to get a new hard drive soon but if anyone else stumbles on this, might be good to know what it is specifically?