A Blu-ray disk stores more data than DVD because it uses a blue laser that has a shorter wavelength (405 nm) rather than a red laser (650 nm).
What is a Blu-ray disk?
A Blu-ray disk can be defined as a high-capacity optical disk storage medium that is designed and developed by Sony, Blu-ray Disc Association, so as to record (store), rewrite and play back high definition (HD) video formats.
Based on scientific information, the reason why a Blu-ray disk stores more data than DVD is simply because it uses a blue laser that has a shorter wavelength (405 nm) rather than a red laser with a wavelength of 650 nm used on DVDs.
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