Despite "turn hard disk after" set to 10 minutes (or less for testing) in Power Options, HDDs won't turn off at all. They used to until yesterday. I have made no changes to the system only updated NVidia driver, but I can't tell if the issue started after update or not.

I've checked disk activity via performance monitor and there is small (approx. 100kb/sec), but constant activity on drive C: which is SSD. Most of it comes from System PID4. Again, I am not sure if this is causing the issue.

Any help would be appreciated. I am super sensitive to sound and HDD not being turned off makes me very tired in very short time.

Thank you.