Write speed Speed Class App perf. (R/W IOPS)
Class UHS Video 1500/500 4000/2000
2 MB/s C2
4 MB/s C4
6 MB/s C6 V6
10 MB/s C6 U1 U10 A1 A2
30 MB/s U3 V30
60 MB/s V60
90 MB/s V90

Logos by the SD Card Association; From the SD card wikipedia page.

Last updated on April 2023