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Is u3 better than class 10?

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The speed class rating tells you the minimum speed an SD card will write. In other words, your card will never write at a speed slower than its rating. U1 supports at least a 10MB/s write speed, and U3 cards offer at least a 30MB/s write speed. If you shoot in 4K a lot, you have to get a U3 SD card.Apr 18, 2018

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