Question about SSDs and the series X

Not really...

Xbox Series X games / upgrades / updates has to be installed onto the Series X internal or expansion card SSD,

You can have Xbox One games on your external hard drive that will get an Series X upgrade but the games will need to be transferred to the Series X and then the Series X upgrade will need to be downloaded onto the Series X SSD,

As an example...

I have Marvel Avengers on my external hard drive that will get the Series X upgrade and I will transfer the game over to the Series X SSD ready to download and update the game to the Series X version when available.

Yeah, I think it's the Blu-ray disc drive, as it happened on my Xbox One X (HDD) and does the same on my Series X (SSD). Don't worry about it!

You can or should be able to use it for the Series X but i don't recommend running your games from it,

as you wont get the fast loading or fast travel time of what the Series X custom NVMe SSD is capable of,

It's best to use any external HDD or SSD for just game storage and transfer you most played games onto the Series X NVMe SSD.

No hard drive on series X, only SSD...

Are you using a Series S/X?

Series S/X optimized games can only run from the internal SSD or an expansion card made specifically for the Series S/X.