Okay, I got an extra 1TB SSD! Now I won't have to worry about running out of disk space.
It's Samsung 870 EVO. By the way, by looking at images of it on the internet I thought it would have a plastic case, but it's metal.
But my PC doesn't show it 😢
Update:
I looked at the guide, I needed to Initialize my SSD in Disk app
Everything works now
I was afraid the SSD was broken 🤷♀️
The first thing I did is to move all cache, etc. from DaVinci Resolve to new disk, so now I can store all this large stuff on a new SSD.