Posted by: Anonymous
[ip: 10.1.4.39]
on April 21, 2008 07:43 PM
From Anonymous: "A CD burner or DVD burner does not do this... it only takes the disc and changes the chemical nature of the surface to make it readable in a binary way... and it is a well know fact that the chemical surface on the burned CD or DVD will break down"
The surface of a CD/DVD is plastic. Nothing more. There is a dye that is encased **inside** of the plastic. This dye is changes by the laser that the burner uses to record the data. By changing the dye, it changed the reflectivity of light shining through the plastic (and bouncing back from the reflective surface). The dye can either break down chemically, the seal can break, or the reflective surface can deteriorate. There are even reports of some sort of fungus or something that eats CD-R (dunno about DVD-R) dyes that is down in central or south america.
Factory-pressed means that the data is stamped into the disc (again ***NOT*** on the surface of the disc). Factory-pressed discs can still detriorate, but it's the reflective layer that is breaking down/oxidizing.
While manufacturing processes can affect certain batches of discs (and this has nothing to do with the surface of the disc), the most important thing is the quality of the dye used (i.e. which dye a certain manufacturer uses). The most highly regarded discs are Taio Yuden (sp?). They are an original manufacturer (not a repackager like Memorex or Verbatim). They also sell discs to repackagers that sell discs as well. I've heard the if a batch is from TY, it will have "Made in Japan" on the packaging.
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Re: Data for 30 years? Nope.
Posted by: Anonymous [ip: 10.1.4.39] on April 21, 2008 07:43 PMThe surface of a CD/DVD is plastic. Nothing more. There is a dye that is encased **inside** of the plastic. This dye is changes by the laser that the burner uses to record the data. By changing the dye, it changed the reflectivity of light shining through the plastic (and bouncing back from the reflective surface). The dye can either break down chemically, the seal can break, or the reflective surface can deteriorate. There are even reports of some sort of fungus or something that eats CD-R (dunno about DVD-R) dyes that is down in central or south america.
Factory-pressed means that the data is stamped into the disc (again ***NOT*** on the surface of the disc). Factory-pressed discs can still detriorate, but it's the reflective layer that is breaking down/oxidizing.
While manufacturing processes can affect certain batches of discs (and this has nothing to do with the surface of the disc), the most important thing is the quality of the dye used (i.e. which dye a certain manufacturer uses). The most highly regarded discs are Taio Yuden (sp?). They are an original manufacturer (not a repackager like Memorex or Verbatim). They also sell discs to repackagers that sell discs as well. I've heard the if a batch is from TY, it will have "Made in Japan" on the packaging.
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