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Message: <blockquote data-quote="Horoscope Fish" data-source="post: 174076" data-attributes="member: 13090">Speed Class designates the minimum, sustained, writing performance of the card in question. So a "Class 10" card supports, at a *minimum*, 10MB/s write speed; the Speed Class says nothing about the *maximum* write speed. If the camera allows for faster writing, say 15MB/s for instance, a Class 10 card will certainly support it, up to it's maximum stated thorough-put (e.g. 45MB/s). But in order to get that 45MB/s transfer speed, your camera has to be able to move it's data that fast and if it can't there's no point in paying extra for "speed" you'll never use....</blockquote>