A colored underside, not a new kind of disc
Original PlayStation games used the CD format, but their underside—the side the console’s laser reads—looked dark blue or nearly black instead of the familiar silver of many music CDs. The color came from the disc’s materials and manufacturing, not from a special blue light or a different way of storing the game. The console still read tiny patterns of data from the disc with a laser.
That visual difference gave players and shopkeepers a quick clue: a silver disc was unlikely to be an original PlayStation game. A copied game burned onto an ordinary recordable CD usually had a visibly different underside, often greenish, blue, or silver depending on the blank disc.
A signal, not a lock
The color helped make casual copying easier to spot, but it did not make copying impossible. A person could duplicate game data onto a recordable CD; the practical obstacle was getting an unmodified PlayStation to accept and run it. Disc appearance was therefore a visible warning sign, not the main technical barrier to piracy.
That distinction mattered as copied discs became more common: a quick glance could raise suspicion, but it could not prove whether a disc was genuine. The blue underside’s most memorable effect was simpler—it made a PlayStation game look unmistakably different from the everyday CDs players already knew.
