Xbox Series X not recognizing games from External SSD.

Fair enough, a slow internet connection is as good excuse as any.

Be aware however that while that drive will work on Series X, you won't be able to play Series X games directly from it. Series X games will require faster access and read speeds. My understanding is that the Series X games can be 'backed up' on an external
drive and then need to copied/moved over to either the internal SSD or the External SSD's that will be available for the machine.

The Series X will read and play Xbox One games from an external drive though.

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.

On the Series S or Series X, games which are "Optimised for X/S" or games specifically designed for those consoles have to be run either from the SSD in the console or the Official Storage Card. They can't be run from any other external drives. Other games (Xbox One games etc) can be run from an external drive.

Hi,

Your drive will work the same on Series X as it does on Xbox One and you won't need to format it.

However, Series X games or Xbox One games with Series X enhancements will not run from that drive and will either need to be installed internally or to an external SSD designed for Series X/S.

Your hard drive will be too slow for Series X games. They can be stored there, but not run from there.

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.