On Wednesday March 19 2003 05:19 am, Peter Watson wrote:
> There was a recent thread which talked about identifying the
> manufacturer of CD-R'S using ATIP information. I have since come
> across the following, I've no idea how true it is but it makes
> interesting reading.
Thanks Peter. I've never had any reason to doubt atip info till
I read what you posted below. Guess I need to do some Google'in ;)
If it's fact, then there is no way to tell who to heck made the
CDr's. Which if that's the case, I'm left with 'the greener the
better' when looking at the uncoated side ;)
--
Tom Brinkman Corpus Christi, Texas
> ======================================================
> Charles Palmer, from cd-recordable.com, had this to say about the
> manufacturer identification:
>
> "Two components that many users of these programs always take as
> gospel are Media Manufacturer and Dye Data. These two readings are
> next to worthless.
>
> The reason for this is that many CD-R manufacturers (like CD-
> Recordable.com) purchase their stampers (the nickel die that all
> CD-R substrates are molded from) from 3rd party sources. These 3rd
> party sources (either other disc manufacturers, or mastering
> houses) encode the data that these 'Identification' programs read,
> at the time that the original glass master is encoded. The
> 'Manufacturer' information that is encoded is usually the name of
> the company that made the master. Since stampers made from that
> master will be sold to disc manufacturers the world over, all of
> discs that those manufacturers produce from those stampers will
> contain the same 'Manufacturer' information. Information which is
> obviously quite erroneous and irrelevant. Very seldom will the
> 'manufacturer' information encoded on a CD-R actually tell you
> anything other than who made the original master. [...]
>
> The second piece of data (the dye type) is also dubious. Because
> most master/stamper configurations are designed to be matched to
> specific dye types (Phthalocyanine, Cyanine, Azo, Etc), the 'Dye'
> information that is encoded when the master is produced indicates
> the type of dye that the master was designed for. This of course,
> does not assure that the manufacturer that buys and uses this
> stamper will be using it with the dye that it has been designed
> for. It is quite possible that a stamper/dye combination is used by
> a CD-R manufacturer that contradicts the 'dye' information encoded
> on the master. Therefore that information becomes as potentially
> misleading as the 'Manufacturer' data discussed earlier." The only
> reliable piece of information in the "ATIP" region is the disc
> length.
> ======================================================
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