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What is U1 and U3 micro SD card? – TOPESEL
Micro SD Card U1 VS U3: What's the Difference and Which Is Better - MiniTool Partition Wizard
Everything You Need to Know about SD Cards | B&H eXplora
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