What is the difference between speed class 3 and speed class 1 on SDXC cards?

Started Sep 3, 2014 | Discussions thread
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Petroglyph
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What is the difference between speed class 3 and speed class 1 on SDXC cards?
Sep 3, 2014

The number appears inside a little U on the face of a UHS-I SDXC card. They also print the read speed e.g., 45 mb/s, does speed class have to do with write speed?

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