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enima
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| Quote: | Originally posted by I am a fish
| Quote: | Originally posted by Organikum
Wouldn´t it be easier just to rip the disk? |
 THAT'S CHEATING
Plus, a permanent chemical way of preserving the disks could be a lot cheaper than buying a writable DVD. |
Actually in the long term a 50$ dvd writer is going to work out to be cheaper than buying chemicals for all the dvds. IMO chemically
'preserving' the disk is a big waste of time.
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Marvin
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Mr Fish was talking about a writable DVD disc, not a drive.
The amount of dye in a protected layer is miniscule, so a chemical treatment could have a negligable cost.
Best available infomation says the oxygen sensitive dye is leuco-methylene blue with some polyhydroxy aromatics to prevent photochemical bleaching.
The key here is that atmospheric oxygen oxidises the molecule, forming a delocalised link between the two benzene rings. The longer the
delocalisation, the longer the wavelength it can absorb at. The -N= of the oxidised form is the problem and I'm wondering about a methylating
agent. Depends largely what we can get to the layer. The page thats telling us its oxygen activated is the same page thats telling us its part of
the resin that bonds the two layers of a dual layer disk together.
If it was possible to polish off the protective layer, somehow I think they would have spotted that flaw by now. They are being sold, so if someone
inside the US wants to buy one and report back 
Of course under the DCMA and some international laws this conversation itself may be illegal.
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trilobite
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I guess that this technology has been patented. 
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IrC
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"this conversation itself may be illegal"
Does this mean free speech is dead, that greedy corporations supercede the first amendment? If so, to hell with their laws.
A: a chemical reaction that leaches out the opaque layer?
B: a chemical reaction that converts the opaque chemical to a non-oxidizing clear product?
C: replace the laser in the DVD drive with a rapidly pulsed YAG?
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sparkgap
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Saerynide, I was thinking silica is bad enough, but carborundum paper is not something to use on polycarbonate discs.
After some research, I have confirmed Kanem's guess that polycarbonate is gas permeable. See here and here.
A reaction that leaches out the opaque layer may render the disc unreadable as well, I think. And how will you source out a YAG laser?
sparky (^_^)
"What's UTFSE? I keep hearing about it, but I can't be arsed to search for the answer..."
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cyclonite4
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Even if IrC's methods don't work, the philosophy is right.
\"It is dangerous to be right, when your government is wrong.\" - Voltaire
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