how can game developers update physical games (discs etc.) if the game is already on the disc?

Question

how can game developers update physical games (discs etc.) if the game is already on the disc?

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Answer 1

Modern games don’t really play directly from the media they come on anymore, but usually get installed on the PC’s or consoles local storage. Since all modern gaming machines are connected to the internet that locally installed stuff can be modified.

In theory since an update or patch only will affect a small percentage of the data, this should take much less time than downloading the whole game, in practice sometimes developers don’t always care about this sort of thing.