Ah, thanks for clearing that up... any idea if the expanded memory can be accessed as fast as the non-replaceable one?
Well Mark Cerny said any M.2 SSD we add in the expansion bay has to meet the performance standards of the PS5 internal SSD. So it had to deliver the same speed for running PS5 games as the built-in storage does. That’s why Sony has to test those M.2 drives first to see if they meet benchmarks.
This is so developers can program PS5 games to fully take advantage of the PS5 SSD speeds. They shouldn’t have to worry “what if a user adds a slower secondary drive” or anything like that. That could fuck up their development goals.
So we as the users can only add more storage for PS5 games if the drive performs the same as the PS5‘s own SSD, so for the game code, its the same. That way we can install a PS5 game on the 825 GB main SSD or a M.2 SSD in the expansion bay and it will play the same regardless.
For the Switch, we can just add more storage with a Micro SD card (that meets spec) because that delivers sufficient performance for Switch games to run. The Switch uses internal flash memory, Switch game carts are flash too, and SD cards are flash. So it all can deliver the speed the games are built around.
For the PS4, we can use external USB 3.2 HDDs because that type of drive and connection also delivers sufficient performance for running PS4 games. But we can’t use USB 2.0 HDDs because those drives are too slow. That’s why when PS4 launched in 2013, they didn’t allow USB HDDs to be used as external storage because lots of external HDDs in 2013 we’re still USB 2.0. Thankfully that changed.