I was wondering about DVD (and CD) wear. I looked around and found a bunch of people talking about how lasers can wear out, but none explained how or why. Can someone explain the science of â€œwearing outâ€ a laser for me? Granted, I have not built a laser of my ownâ€”yetâ€”but I have studied them starting many years ago and know quite well how they work, but cannot figure out how it could â€œwear outâ€, at least not in any practical, detectable way.
Also, what about discs? I know they degrade with time (which really, really sucks), but does playback hurt them too? I expect that excessive heat is bad for them, but is it okay to read a disc soon/immediately after burning it (like to verify the burn was good) or should you let the disc cool down/set first?
And what about the laser? Does repeated exposure to the laser cause a disc to degrade faster? For example, is it a bad idea to buy â€œpreviously enjoyedâ€ movies from the video store? I know that video store tapes would wear out quite a bit, but what about video store DVDs?
Thanks a lot.