Is there a significant difference between a class 10 and class 4 16 gb micro sd card?
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Motorola says the DX only supports up to a class 6 sd card. That being said, a class 10 *should* work fine just at a slower speed.
Based on the few read/write tests I have seen performed, a class 4 from a top manufacturer such as Kingston will just about max out the DX write speed, so IMO there is no reason to spend the extra for the faster, wasted speed.
Droid X rooted .602. Overclocked to 1.15ghz at 60 volts. Can run 1.4ghz stable.