According to the Kinoma blog, there can be big differences in quality and speed between one storage card and another. For quality, all you can really do is buy a brand you trust. But for speed, the good news is that there’s now a standard way of classifying the throughput of SD and SDHC cards — the Speed Class.
It’s really easy to understand, too. Class 2 cards guarantee a minimum transfer speed of 2 MB/second, Class 4 cards a minimum speed of 4 MB/second, etc. A card’s Speed Class should be clearly marked as a number in a round “C”, as shown above.
Kinoma recommend that you always buy storage cards that are Class 4 or higher, and normally buy Class 6 cards wherever possible. With a faster card your phone spends less time on data transfers, which translates to more efficient media playback. As an added bonus, copying media between the card and a PC will be faster as well.
via Kinoma Blog
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