[Peter Ralph] “3. If you copy a 3 year old disc any degradation on the original will be transferred to the copy – so you cannot avoid the problem by duplicating the disc every few months.”
Whoa, I’d like to know the reasoning and evidence behind that one. The whole idea of error handling mechanisms within the media is to eliminate the possibility of bits being misread. It shouldn’t matter if you have a disc that degrading or not. If the data can still be properly read by a good reader, then the intact data would be transferred to a new, clean, pristine disc and the degredation clock starts over at that point. I myself have made copies of two year old discs to new media and had no problems at all when playing back the new disc in a DVD player. But it sounds like you’re saying that my new disc might as well be two years old. Sorry, but I don’t agree. We’re not playing in the analog world (where I would indeed agree with you), this is different.
So obviously your finding disagree with me. Can you elaborate?