Console or handheld support
Valve lists the Steam Deck slot as UHS-I with SD, SDHC and SDXC support. This is a UHS-I microSDXC card.
Samsung PRO Plus microSDXC 512GB
A U3, V30, A2 microSDXC card with a 10-year limited warranty. Its 180MB/s rating needs Samsung's own reader.
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512GB microSDXC with SD adapter, model MB-MD512SA/AM
512GB microSDXC with SD adapter, model MB-MD512SA/AM
What works. What doesn't.
Speed
Rated up to 180MB/s read and 130MB/s write. Samsung's data sheet says maximum speed needs its own reader; standard UHS-I hosts use SDR104, which the SD Association caps at 104MB/s.
Capacity limits
512GB microSDXC, a card type Valve lists as supported.
Installation
We have not documented setup on Steam Deck for this card.
Read the bigger picture.
Game storageBuying guide
The best microSD card for Steam Deck is about capacity, not speed ratings
Steam Deck's UHS-I slot caps card speed near 104MB/s, so the 180MB/s and 205MB/s ratings on the box do not apply. Here is what to buy instead.