What is the difference between 'U1' and 'U3' on SD cards and other storage devices like thumb drives? - Quora
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SanDisk Extreme PRO 64GB SDXC Memory Card up to 170MB/s, UHS-1, Class 10, U3, V30, Black: Amazon.de: Computer & Zubehör
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Original Sandisk Micro Sd Memory Card C10 U1 U3 4k Trans Flash Camera Microsd - Memory Cards - Aliexpress
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