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Amazon.com: SAMSUNG PRO Plus microSD Memory Card + Adapter, 256GB MicroSDXC, Up to 180 MB/s, Full HD & 4K UHD, UHS-I, C10, U3, V30, A2 for Android Phones, Tablets, GoPRO, DJI Drone,
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What do the abbreviations A1 and A2 mean on SD cards?
