HDD uninstalled problem

Hi!

So, my computer just notified me, saying it uninstalled my internal HDD storage, without any other detail. I checked, and it's true. I can't get to any of my files or programs installed on it. And I can't find it anywhere on my computer - I searched on the disk manager as well as in the file explorer. I only have my SDD right now...

Anyone has an idea what the problem is, or how to fix it?