I lol people saying class 10 is better.
Okay people, wake up call,
* Class speed defines MINIMUM writing speed. It defines the slowest writing speed possible under normal circumstances. When I said normal I mean under ideal condition and room temperature. Class speed has NOTHING to do reading speed. While it correlates with reading speed, there is NO definite relationship between them.
* Even if reading speed is increased, it does NOT translate into increased performance for flashcart. In flashcart we are looking for random access speed. Reading speed everyone is referring to sequential access speed. Sequential access speed means data is being read from point A to B to C to D in order. It is an important factor camcorder, camera, computer, etc. Random access speed on the other hand, is an important factor for flashcart. In random access speed, data is being read from point A to D to B to C in RANDOM order. Reading speed does not tell us random access speed. Again, while reading speed tends to correlate with random access speed, there is NO definite relationship.
* Class speed is rated by manufacturer. It is NOT confirmed by SD card association. Therefore it is possible that some manufacturer lie about class speed.
* While there is no conclusive evidence behind this, people have reported that higher class leads to higher chance of data corruption.