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

Assuming the game is actually run from some read-only storage like an optical disc (as other comments point out, many games today don’t actually run live from the disc), patches can be installed to the device’s local storage, the software is designed to prefer reading files from that storage instead of the removable media.