Originally Posted by ed1
My quick research indicates that Azuradisc is a repair service for discs. They also offer a guard product, which appears to be a plastic layer over the printed side of the disc. Supposedly to help protect the foil layer of the disc.
I'm not sure this is the cause of the failure of my BDP-103 to read the blu-ray disc. The movie box had 2 discs. One was a dual layer Blu-ray of the movie iteself. The other was a DVD with trailers, interviews, extra features. Both discs had the Azuradisc protection. The Oppo player could not play the Blu-ray disc, but played the DVD just fine.
Why would a label-side protector affect the player's ability to play any disc? And why the problem with the Blu-ray but not the DVD?
This is not a surprising result... at all... the "protective film" applied to the label side of the disc is thick enough to MOVE THE DISC CLOSER TO THE LASER. This will affect the operation of the focus servo... a feedback system that keeps the laser focused on one of the two layers of the disc to compensate for slightly wobbly playback (discs rarely seat with 100% perfection and discs are rarely 100% perfectly flat nor do they have absolutely perfect and uniform thickness... all of those things require focus (up and down movement of a lens) and tracking (compensation for slight out-of-roundness) servos to keep the data readable.
With the stick-on layer applied, the laser is trying to focus in between where it thinks layer 1 and layer 2 should exist in space.
Another issue with a stick-on layer like this... let's assume the hole in the stick-on layer is large enough that neither the top nor bottom part of the clamp mechanism in the disc transport actually touch the adhesive film... the clamp only touches the bare disc because the hole in the clear film is large enough. The disc spins fairly fast and if the adhesive layer is placed even SLIGHTLY off center, it will unbalance the disc, causing the disc to wobble while it rotates. The focus and tracking servos can compensate for a minimum amount of wobble present on production commercial Blu-ray discs, but when you place something like this material on the disc, the balance of the disc can be changed enough for the wobble to become so severe that the focus and/or tracking servos to not be able to read the disc reliably.
So blame the stick-on protector for the problem. But as Bob mentioned... clean the disc anyway... rental discs (and library discs) will sometimes fail to read even if they look clean initially. Clean it anyway and dry it, then see if it plays. If not, the stick-on protector is the problem. To clean discs, I find a drop of liquid soap and water works fine... clean the clear side of the disc, dry with any clean & soft towel. there is a hard coating applied to Blu-ray discs that prevent a soft towel from scratching the disc.