Been watching Narnia again and accidentally returned to the menu, alright I thought and clicked play- but instead of going from the start the DVD went back to where I was in the film… now I’d completely forgotten that they could do that.. but how do they do that?
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The DVD doesn’t know it, whatever’s playing the DVD does. Most old DVD players didn’t track anything so you had to manually handle it yourself. Some more advanced DVD players had/have some small internal storage to keep track of things. On a computer the media player software keeps track of where it stopped which file, saves the state onto the computer’s storage.
With bluray things are a bit different, but I’m not really sure exactly how. I believe some Bluray standards *can* store that information on the disc.
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