Internal HDD for XBOX ones S

The internal hard drive is not meant to be swapped out. Doing so would violate the terms of service and as such, cannot be discussed on the forums.

Series S. it seems to be any game. I haven’t found one I can play directly from the hard drive yet. In honesty I haven’t tried many but seemed odd that I haven’t found any yet?

The only games that would be directly playable from an HDD would be Xbox one games.

Xbox Series X/S games can only be stored but not played from an external HDD. Those can only be played from either the internal ssd or one of the WD or Seagate expansion ssd's that plug into the back.

The reason is the Xbox Series X/S games are setup to take advantage of the speed of the internal ssd. For comparison Internal SSD has raw read speeds of 2.4 GB/s whereas HDDs would only be a max of 500 MB/s.

all xbox 360's have upgradable hard drives, the slims just have a different internal hdd from the old 360's.

The Xbox One X has a 7200rpm internal hdd - Xone and S use 5200rpm. This makes little difference running games, but, but initial loads may be slightly slower on an external 5200 drive compared to the internal drive of the X, but
it depends on the game.

I'm getting an Xbox One X and I still intend to use my 1TB external drive for a while yet as it worked fine on my original Xbox One.

No, it's 5400rpm hdd

external hdd's are not fast enough for the new series s/x optimised games and therefore have to run off the internal ssd or the new expansion cards, all xbox one games and 360 BC games can run off your external hdd.