At 12:38 PM -0600 11/29/2011, Kris Tilford wrote:
On Nov 29, 2011, at 12:23 PM, Dan wrote:
I don't trust burned optical media much.
Me either. I had a commercial CD that I kept "pristine". When it
wouldn't read correctly, I held it up to the light and could see
pinpoint holes large enough for tiny shafts of light to come
through. Using magnification the holes looked like corrosion had
'eaten' away the substrate material as if tiny moths or worms were
inside the plastic. As I said, this disc was pristine, always in a
case, no scratches, nothing except internal corrosion that destroyed
it from inside itself. Probably not that common an occurrence, but
what can you do when it happens?
Extremely common. What you saw was ... rust. Seriously! The
plastic is permeable to oxygen. The O leeches thru the plastic and
oxidizes the substrate, filling in the pits and otherwise changing
the way things reflect (which is what the read laser needs to
retrieve the data). Recordable media are more susceptible because of
the changes the heat of the laser makes in the plastic. But even
pressed (commercial) media have the problem...
- Dan.
--
- Psychoceramic Emeritus; South Jersey, USA, Earth.
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