• The rewritable formats-DVD-RW and DVD+RW use phase-change materials.
• Two different laser power levels are used for writing and erasing data on a phase-change disc. The highest power level causes the surface of the material to become less reflective, and a lower power level causes the material to become more reflective.
• Phase-change-based recordable DVD-RW media can be rewritten more than 1,000 times, while DVD+RW can be rewritten more than 10,000 times.
• Every year DVD players are becoming better at reading these DVDs.

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