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An unofficial patch, sometimes alternatively called a community patch, is a patch for a piece of software, created by a third party such as a user community without the involvement of the original developer.
Optical discs can be reflective, where the light source and detector are on the same side of the disc, or transmissive, where light shines through the disc to be detected on the other side. Optical discs can store analog information (e.g. Laserdisc), digital information (e.g. DVD), or store both on the same disc (e.g. CD Video).