Basic Micro SD 512 GB. I have just bought it for my Steam

All the space you need Enhanced speed + compatibility = dependable performance. EVO Plus + Adapter lets you store tons of media on your phone, load games to your console, or download more apps on your tablet. Top-noch speed makes transfers seamless and reliable. Fast and smooth Even with huge files, EVO Plus is incredibly quick with superfast U3, class 10 rated transfer speeds of up to 130MB/s. Big apps load and run smoothly, while 4K video remains sharp with A2, V30, and UHS-I Interface.

Samsung Evo Plus microSDXC Memory Card - 512GB

Extreme 512GB MicroSDXC XAV SanDisk V30 U3 A2 UHS-I XAH

256/512G Game Card for Steam Deck / GDP WIN4 / WIN600 / Windows PC / M – jmachen

Should you buy a Steam Deck?. Ohh boy, I've been waiting for this for…, by talkingStuff Network

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Sandisk Micro Sd Card 32gb 64gb Memory Card Class10 Tf Card 100% Original Tf 128gb 256gb Max 512gb 1tb For Smartphone And Tablet - Memory Cards - AliExpress

[Expand] Expand your storage for downloading games, bigger contents, screen shots and video captures [Smooth] A2 spec contributes to faster loading

Nextorage Japan 512GB A2 V30 CL10 Micro SD Card for Nintendo Switch, Steam Deck, Smartphones, Gaming, Go Pro, 4K Video, microSDXC Memory Card UHS-I U3

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Silicon Power 512GB Micro SD Card U3 SDXC microsdxc High Speed MicroSD Memory Card with Adapter for Nintendo-Switch, Steam Deck, DJI Pocket 2 and Drone