[TrK]

Two reasons for that specific error, either your partition is lost or your file system data got corrupted for that specific drive, would suggest you to try file system fixers but they have a success rate of 40% only the only doable option would be format that drive and do a data recovery. You can also try booting from another media like flash drive or other system and check your drive if its affected the same way it was when you were using your installation of OS.