The higher the Class rating the higher the read/write rate on the SD Card.
Class 2: 16 Mbit/s (2 MB/s)
Class 4: 32 Mbit/s (4 MB/s)
Class 6: 48 Mbit/s (6 MB/s)
Class 10: 80 Mbit/s (10 MB/s)
The higher the better for transfer rates if you plug it directly in to your computer... When it tranfered my stuff from my class 6 to my computer it was blazing... but when i re-transfered from my pc to the class 2 8gig that came with the phone... it was SLLOOOOWW.
I dont think the phone cares what class it uses, but a computer media reader does .
PS photographers need higher class ratings for faster shooting for their fancy cameras.
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