Just to confuse things further, some cards will display another speed rating on the front. The number is found in the middle of a capital U. U1 means the card has a minimum of 10MB/sec sequential write speed, whereas U3 means the card has a minimum of 30MB/sec sequential write speed. The UHS speed class, U1/U3 has been effectively replaced by Video speed class. These higher speeds will be particularly useful for high quality 4K and 8K video recording, and you should check what rating is needed by your camera if you plan on recording video.
Video speed class, V30 supports a minimum of 30MB/sec sequential write, V60, 60MB/sec, and V90, 90MB/sec. Originally it was simple signified with a large C with a number in the middle, the “Speed class”, however, this was replaced after they reached Class 10. Unfortunately, there are multiple ways in which companies will tell you how quick an SD card is. SD Memory Card labelling explained SD Class and speed ratings explained…
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