Why would you opt for class 4? Class 10 is faster. Price difference is minimal. Class 10 would allow transfer to future devices. Recording video on Galaxy S3 or any modern phone might not go so well with class 4.
Class ten is faster for writing on big blocks of data... like you'd use on a computer... but class for had the fastest read/write times for random access memory.... which is why class for/six is actually better for these phones...
Cellar Door
"Who are you people and where is my horse?"
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