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Thats kinda like the same deal with DVD Burners. You cant compair the diff of a burning speed on a dvd burner to a cd- burner. Like 4x in dvd burning isnt the same as 4x in cd-r burner. This is different because of the size of the cd. cd-rs are usually 700 mb, dvd is what? 4.7 per side? You make the calculations