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The normal surface plane on a DVD. Tracks of small pits are pressed into a pre-recorded DVD substrate. These tracks of pits appear to the read laser as bumps. The height of the bump causes light to be diffracted, reducing the intensity of the reflected beam whenever a bump is encountered along the track. The height of the bump is measured relative to the land area. Similarly, recordable DVDs have a continuous groove pressed in the substrate. The groove appears as a continuous bump, which is used by the burner to provide the precise tracking needed.

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