My Xbox Series X makes a really loud grinding/ Spinning noise when I’m downloading a...

I have a similar problem. Whenever I put a disc in, it makes a loud grinding spinning noise, that I can best describe as sounding like a chainsaw. It won't read any discs or anything.

Depends what noise it is you are talking about.

The Xbox One will make more noise while installing from a BluRay as it is spinning the disc at high speed to install the game.

Once installed, the game runs from the HDD and the disc is used for security authentication at boot up. That is why it is quiet when playing games.

So if the noise was a loud whirring, then that is normal during install. If it was anything else like grinding noise, that isn't normal.

Could it be updates? Its happening to me on a Monday morning. And my Xbox keeps making loud grinding noises.

This was an issue that plagued quite a few consoles early on. If it's making a really loud grinding noise your best course of action is to take it back to the retailer and get it exchanged.

Is it only doing it when you insert the disc or the whole time? How loud is it?

If it’s worrisome or bothersome take it back and exchange it. It should be making any noise and especially a grinding noise.