Between 1998 and 2008, the gaming industry was terrified of piracy. To combat it, Macrovision created "SafeDisc." This was a copy-protection system that wrote corrupted sectors to the physical disc. The game executable would look for these specific "bad sectors" to prove the disc wasn't a burned copy.
Introduction: The 20-Year-Old Nightmare
Command and Conquer: Generals – Zero Hour uses SafeDisc v4.0.
Your toxin general is waiting to load a Scud storm. Your laser general is waiting to overcharge a bunker. Don't let a missing CD stand in the way of history.