The past few days, I have been having problems with my disk going to 100% usage (with little or no read/write activity) and then eventually the entire system crashes. This morning I unplugged the drive and plugged it into a different SATA port, and so far things seem to have been running fine.
However, I've found an additional issue. The action center is giving me a message that says "We found potential errors on a drive, and need to scan it.", and it accompanies this message with a "Run Scan" button. The problem, however, is that when I click the button, nothing happens. And the Task Manager is showing disk read/write activity at 0-1%, so it's not just failing to provide feedback.