So I did buy a 512GB microsd card for my Steam Deck.
Based on my research, the most important spec sounds like the "A2" signifier when it comes to using it to install games and load apps and such:
https://www.mymemory.co.uk/blog/a1-vs-a2-sandisk-microsd-card-whats-the-difference/
"The SD Association states, “The Application Performance Class was introduced to realize comfortable application manipulation such as compilation of data which is stored in an SD memory card.”
So, now that slotted Android devices can store and run apps from removable cards, the SD Association has introduced a new specification to enable the best user experience – Application Speed Class 2 (A2).
Application Speed Class 2, defines the minimum specification for cards and host devices. Sequential read and write speeds are now joined in importance by random read/write speeds (measured in IOPS). The higher the IOPS (Input/Output operations Per Second) the smaller files can be read and written to the card in any one time. So, for apps that open multiple small files – high scores, different graphics for a single level, licensing permissions, etc. – a minimum IOPS level is important, which is covered by the A2 spec."
Might be worth paying attention to if you are going to buy a new microsd card for the Deck or Switch.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850
