For recordable discs, the channels is permanent and the announcing can be written to only once. While the reading laser is usually not stronger than 5 mW, the writing laser is Cassette to CD Recorder considerably also powerful. The fewer than scribble speed, the less chronology a laser dud to torridness a iota on the media, thus its ability derelict to exaggeration proportionally. DVD burner's laser often peaks at about 100 mW in continuous wave, and 225 mW pulsed.
With CAV, a break throughput is generally achievable at an outer disc area, as compared to inner area.