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?
In: 1
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.
The dvd doesn’t know. The player does.
This is not enough explanation for the bot, so I will add this:
The DVD player is and has always been basically been a computer. Like your typical laptop or tower pc. Only that it’s main purpose is linked directly to the disks it’s supposed to play.
The engineers that built it thought that it would be cool to make that computer remember where it stopped playing the movie that’s on the disk. So they put that function in.
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