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That class x stuff is about the max transfer speeds supported, no? Don't the higher class ones always support slower speeds too, possibly even all slower speed settings? I've not heard before of a device that can't read a particular card because it is too high a class. (Any issues tend to be about the storage capacity and the file system needed to fill such a size.) As far as I know you just don't benefit from the extra speed, as the effective speed is determined by the slowest of the two devices (card and reader) involved.
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