I have a Hp DVD640 burner & I am using dvd decrypter & shrink. My questions are how do I change my settings so it will burn using a dual layer disc as I do not see anywhere to be able to change to that setting. Is it "true" to say that a disc that requires say 60% compression will take longer to "process" as it has to compress it if its being written to a single layer so conversly a dual layer would "process" faster? If not then what is the compression doing? Hope it makes sense, thanks Shado36.