SD Card Speed = 90MB/s Easily - PS4+XBOX1 Were using Slow Laptop 5400RPM 70MB/s~ most of your library (99.9%) will run just fine on Steam Deck (Just slower loading) the 399$ Model
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Rocketek SD TF Card Reader, USB 3.0 Memory Card Adapter Dual Slot for SD SDXC SDHC
Get more storage on your PlayStation 4 - YouTube
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