Thank you.

I ran the command and it could not find any corrupt files.

I just realised that also one old photo is nor corrupted.

I just copied a couple of photos to the C drive (from my phone), so as to see whether these will become corrupted as well.

To be honest, I am not so sure anymore about the mp3 issue. Perhaps it is unrelated.

Is there any other way to find out whether or not my hard drives are going bad?
Could it just be a virus and I should try to format my PC?

It is so weird that only some photos are corrupted and also not at the same time, it seems to happen slowly.

Thanks anyway