Though quiet at the moment, my desktop sometimes sometimes makes a noise that I attribute to either a disk or a fan on its last legs. I'm looking for suggestions for distinguishing.
For the disk, I expect I should use either hdparm of fsck. Even after reading the man page, I'm not sure how I would use hdparm. If I use fsck, what should I take as evidence of a bad drive? A good drive?
Is there a way to tell whether the OS thinks a fan is on? Is there a way to turn a fan on or off manually?
Time for a backup.