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What is the difference between class 2 and class 4 microsd cards

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The difference between class 2 and class 4 micro sd cards is that the class four is faster. The class refers to the minimum write speed for an empty SD card. Therefore the class 2 writes at 2MB per second while the class 6 at 6MB. For more information please refer to http://www.berryreview.com/2009/01/12/faq-understanding-microsd-microsdhc-card-speeds-class-6-class-4-cards-write-read-speeds/.

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