I was playing a game, alt-tabbing froze my system so I waited a bit and then rebooted by using the button on the case, since I couldn't do differently.
It now throws an error when mounting a drive: error mounting /dev/sdb1 at /media/user/local disk 1: unknown error when mounting (udisks-error-quark, 0)
This drive doesn't have anything I was using on it, since it's a media storage drive. I booted up Windows on my second drive and it can see and access this one without problems. How to fix?
Yes, I just learned I can use a different filesystem to avoid (or at least minimize) these issues in future. I tried formatting a portable HDD and I could only pick FAT, that should be OK since I picked "Linux compatibility" or something like that in the format wizard!