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How to tell the speed difference between SD cards
The first one is the Class value. There are four levels of C2-C10 on the SD card. The second one is UHS value. UHS means ultra-high-speed interface, and currently you can see two levels of U1 and U3. The third, HC and XC values. HC is a High Capacity memory card, and XC is a Xpanded Capacity memory card.
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