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DVD Formats
DVD-R and DVD+R (recordable)
- Can only be written to once.
- An organic dye, sensitive to infrared light, is used to coat one of the layers of the disc.
- When the organic dye is exposed to a low frequency infrared laser, its crystalline structure is permanently changed to form reflecting and non-reflecting patches on the disc, readable in a DVD player.
- Only since 2001 have players become better at reading these DVDs.