SD Card markings

Min. Write Speed class UHS class Video class 1.5K/0.5K IOPS 4.0K/2.0K IOPS
2 MB/s C2        
4 MB/s C4        
6 MB/s C6   V6    
10 MB/s C10 U1 V10 A1 A2
30 MB/s C10 U3 V30 A1 A2
60 MB/s C10 U3 V60 A1 A2
90 MB/s C10 U3 V90 A1 A2

Logos by the SD Card Association; From the SD card Wikipedia page. Original XHTML version here.

Last updated on April 2023