Disk problems.

[BlueEwok]

I have most of my games on an external harddrive, everything w working fine, and then it wasn't. At first it was the "Corrupt disk" message when I tried updating Baldur's Gate 3, now Steam doesn't even recognize any of the games downloaded there (Stardew Valley is on the PC HD, works fine).
I tried repairing folder through Steam, but it says it's either corrput or unreadable. I cannot open the steamapps folder (same error message), and somehow can't delete it either (I am running as admin).
I tried running dskchk but it went on for over three days with no progress, it said "corruption found while examining files in directory \SteamLibrary\steamapps\ (x). The (x) was a number that went on till 50000 something and then I gave up.
I really don't want to have to format my HD since I don't have space for the files there, and this is the only folder with a problem. What do I do?
Windows 11 btw.