What Does the Class Rating of SDHC Card Mean?

By definition, the SDHC card's class rating is the minimum sustained read/write speed of an SDHC card expressed in megabytes per second (or MB/s) when recording 1080p HD video. For example, if your DCLR camera requires a Class 10 card for shooting 1080p video, that means you need a card with a minimum sustained write speed of 10MB/s to ensure proper video quality from your camera.

Remember, this is the minimum recording speed, not the maximum performance of the card. So it is possible to have a Class 10 card that boasts 30MB/s or higher read/write speeds.

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