Run diagnostics (F12 immediately at boot) and the drive should show up with the errors. Also download and run Crystal Disk Info here and run it on your drives. It will display the drive stats and which drive, if any, is giving you trouble.
Issue with with an alert that the hard drive is failing, but can't find an issue with any of the drives. I've scanned all connected drives, and opened the shell and did a thorough dusting job. The alert that goes off directs me to where I can purchase a replacement drive, but instead of saying which one, it shows me the two drives that were installed when I purchased it. Every time the PC restarts, a super annoying loud alert plays till I go over and bypass it to start the computer. It's taking a bit longer to start than it used to. 
XPS 8930, alert, hard drive is failing