I’ve noticed this on DVDs and BluRays but also with games on any console. I’ve rented a movie and the disk is riddled with scratches and I’m sure it’s not going to read, but it somehow does. However, sometimes it hitches. But playing it back on a different DVD player presents no issues at all. What’s happening here?
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One more thing to add to the points already mentioned: the type of the scratches matters.
As data on CDs, DVDs and Blu-Rays is stored in a spiral track, they can be surprisingly resistant to radial scratches. It’ll have to be a really severe such a scratch or there to be *a lot* of them in order to affect reading/playback. It might look bad, but a radial scratch will cover a very small portion of a single rotation of the data track, something which error-correction usually has no problems taking care of. By contrast, it doesn’t take much of a circumferential scratch to affect reading of the disc because that kind of a scratch goes *along* the data track(s), not across it, so there’s a long stretch of continuous disturbed disc area, instead of a single ‘blip’ for each rotation of the disc.
One more thing to add to the points already mentioned: the type of the scratches matters.
As data on CDs, DVDs and Blu-Rays is stored in a spiral track, they can be surprisingly resistant to radial scratches. It’ll have to be a really severe such a scratch or there to be *a lot* of them in order to affect reading/playback. It might look bad, but a radial scratch will cover a very small portion of a single rotation of the data track, something which error-correction usually has no problems taking care of. By contrast, it doesn’t take much of a circumferential scratch to affect reading of the disc because that kind of a scratch goes *along* the data track(s), not across it, so there’s a long stretch of continuous disturbed disc area, instead of a single ‘blip’ for each rotation of the disc.
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