What's the difference between Extreme SDHC and Extreme HD Video SDHC?

Memory Cards Mobile memory, professional cards and all other st
2

Hmm, for this mysterious SDSDRX3-016G-A21(class 10, 30MB/s), I saw two different versions from authorized resellers, one has “SDHC” label, the other one has “SDHC I” label. It seems the one with “SDHC I” supports UHS-I, but it’s NOT extreme PRO (UHS-I, 45MB/s), although extreme PRO also has “SDHC I” label on it. This is really a big mess for an established brand.