If you own a camera or camcorder that uses SD cards, chances are you've confounded yourself at some point trying to figure out how fast a card you need (or want) for your device. This is complicated by a lot of factors, primarily that the Class specification defines a minimum sustained transfer rate--Class 6 is 6 megabytes per second, Class 10 is 10MBps, and so on.
That's like saying ais rated for at least 10 miles per gallon; it helps you filter a few other out of your buying decision, but it's not very helpful for sorting through the myriad others with a similar lowest-common-denominator rating.
Nor is there any official body that verifies the performance. The SD Card Association provides some guidelines and testing tools, you pay your licensing fee for the Class logo, and you're in business.… Read more