The most important part of an optical disc drive is an optical path, placed in a pickup head (PUH), usually consisting of semiconductor laser, a lense for guiding the Cassette to CD laser beam, and photodiodes detecting the luminous reflection from disc's surface.
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A recorder encodes (or burns) data onto a recordable CD-R, DVD-R, DVD+R, or BD-R disc (called a blank) by selectively heating parts of an anatomical dye layer with a laser |
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| This changes the reflectivity of the dye, thereby creating marks that can be read like the pits and lands on pressed discs. |