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Posted by Mike S. on 10/06/27 11:46
In article <125d468b1dm5493@corp.supernews.com>,
Voinin <vboing@boing.biz> wrote:
>Silicon Sam wrote:
>> Yeah, I have some TY made Sony's rated at 8X that will burn at 12X.
>> Speed is no concern to me, so all mine get burnt at 4X. Just ordered
>> 300 of the TY 4X's from Meritline. They support 8X burn as well. Free
>> Shipping, they work out to around 24 cents each. TY is supposed to be
>> the benchmark in blank DVD's
>>
>> I have a PC and a Mac, so when my PC is duping a DVD, I flip the
>> switch and use the Mac in the meantime.
>
>My question wasn't so much if you could burn them slower or anything
>like that. What I want to know is what criteria do the manufactures use
>to determine max burn speed of a disc. I generally burn at 8X on all
>discs that support faster speeds.
The "burning" process involves the inducement of a chemical change in the
dye layer by the energy absorbed from the laser of the burner. Each dye
formulation has a range of energy values within which it will produce an
acceptable change (i.e. that will produce discrete spots of sufficient
contrast compared to the unburned portions of dye which can be read as
data). The higher the speed that a disc is burned, the less energy can be
transferred to the dye layer per revolution. So to produce acceptable
results, the power of the laser and burning speed must be matched to the
range of values that will product acceptable data burns on a given dye
formulation.
Think of it like photographic film, if you remember the ASA/ISO ratings.
The more sensitive the film, the more able it is to produce an acceptable
image using less light.
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