Most people (well, probably older folks at this point) have had a DVD or CD player that plays discs that are scratched or covered in smudges, but another (generally cheaper) device cannot play it at all, or poorly. Why are some devices able to play flawed discs while others struggle?
In: 5
Those devices work by shining a laser beam at the disc and reading the flashes and pauses that come back. Depending on how many sensors you have and where they are positioned, and how the player is programmed to respond to what they see, will effect the end result.
Cheap players with a single cheap sensor in the one ideal position might not get a good enough glimpse at the laser light that is reflected. Maybe the laser itself is cheap and doesn’t shine brightly enough or isn’t columnated enough to get through the scratched plastic.
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