What do the abbreviations A1 and A2 mean on SD cards?
SanDisk Extreme® microSDXC™ UHS-I CARD, 4K UHD, Full HD | Western Digital
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Amazon.com: SanDisk Extreme PRO 128GB Micro SDXC UHS-I U3 A2 V30 170MB/s Memory Card with Adapter. Full HD and 4K Ultra HD Video Recording : Electronics
Are high-speed/high-capacity (A1, A2, U3) microSD cards worth it for Android? With Black Friday and Cyber Monday deals coming up, I (re)tested 5 of those and 2 older ones in 3 quite
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