On some cards, both the read and write speeds are shown with the read speed shown with a small R, and the write speed shown with a small W. Many cards will display the MB/s (Megabytes per second) speed the card supports, however, it’s worth noting that this is often the maximum read speed, and it’s worth checking the maximum write speed the card offers. However, be aware that these are the maximum READ speeds, and write speeds are often slower. It’s all well and good saying a memory card is 300x, but 300x what? A card that supports 45MB/s speeds, has 300x on it, and therefore the 300x is 300x 150KB/s. 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. This is the 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 Speed Class and speed ratings explained…
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