Originally Posted by SoundofMind
That's helpful info, rd. irt the highlighted part on scratches: do you mean that one should not play a scratched disc or simply that one should not expect the player to read such a disc?
You won't hurt the player by attempting to play a scratched disc. You just may have to sit through some error retries as it attempts to find a place to continue beyond the damage. If you find that too annoying, then don't play scratched discs. I play scratched rental discs all the time as part of Beta Testing with the OPPO players. The OPPO players can handle some pretty scratched up discs, often without even having to do read retries. Its all in the nature of the scratch.
You should NOT try to play a disc that is cracked or visibly warped (as by overexposure to heat) as those could impact the laser head.
You should also not try to play a disc that has grunge on the surface that might fly off and attach to the laser head. Clean the darn thing first.
It's also not wise to play a disc that has had a sticky tag or the like added to the label side, as they have a tendency to come loose and fly off at inconvenient moments.
Some types of disc damage are not so obvious. For example if you play enough discs you will eventually run into some where the center hole is either too small for the disc to load properly on the spindle or where the hole is not precisely centered causing the disc to have excess wobble. Both will almost certainly mean the disc can't be read, or even won't load properly (won't be recognized when you try to load it). It happens.
And with Blu-rays in particularly, there are types of manufacturing flaws which are tough to pick out with the naked eye. If a disc doesn't play, and other discs continue to play, and the disc surface looks pristine, and you don't see reports here or elsewhere of other folks having problems with this title, then the odds are pretty good you've got a disc with a manufacturing flaw. Usually the store or the studio will be happy to exchange it. By all means, ask here first, or email OPPO to see if they have history on this title (i.e., it is known to play for other people). But don't be shy about seeking a replacement disc.
If you are having trouble getting multiple discs to read without problems, particularly if the problem time codes vary each time you try a given disc, then it is quite possible your laser lens needs a cleaning.