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Secure Digital memory cards are by far the most common cards used in digital cameras today. But unlike Compact Flash, Sony's Memory Stick and xD cards, SD and SDHC cards have two data transfer ratings.
An SD card's speed referes to how quickly it can accept still image data from your digital camera. But the rapid improvement of digital video has spawned a second measure: class.
On an SD card, class refers to how quickly it can accept video data from your digital camera.This number is critical if you're shooting HD video.
So when you're buying new SD cards, check both the speed and the class - to be sure they match your camera's requirements. That's the easiest way to get the best performance from your digital camera.