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How do DVD recorders work?
Unlike stamped pre-recorded DVDs, recordable DVDs do not have actual pits in the tracks when they are recorded on. Instead, a special dye layer is altered to make it reflective or non-reflective as needed.

Digital devices read information in the form of 1's and 0's. 1 means on and 0 means off. Combine those 1's and 0's together, and you get full letters, words, bits of pictures and video.

In optical devices like CD and DVD players, reflected light indicates a 1 and no reflection means 0. The dye layer in a recordable disc can be altered to create a series of reflective and non-reflect "spots" a player can read as 1's and 0's.

In the case of recordable discs, the dye layer can only be changed once. A re-writable disc has a dye layer than can be written to dozens of times before it eventually wears out. However, many DVD players require that a rewritable disc be "closed" (unable to be re-written) in order to play them.

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