Share on Tumblru1 vs u3 SD card How differs the u1 from the u3 SD card ? The sigle u refers a type of bus interface for memory card. You find also the acronym UHS for this class. u1 refers to UHS-1 and u3 refers to UHS-3. To resume, the u3 class is  »able » to … Lire la suite de u1 vs u3 sd card