I don't wish to start a whole new discussion of this, but sdhc card size does affect throughput when reading/writing to the cards. It may sound counterintuitive and it is, but the faster higher rated cards are only faster transferring larger files because of the way the memories and busses are organized. In fact, larger higher rated cards may actually be CONSIDERABLY slower for smaller files than smaller more slowly rated(class 2 or 4) cards. Check through the forum for posts backing up what I'm saying, they might be in the developer's section.
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