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DVD (2 Layer, 1 Side)

The DVD (2 layer, 1 side), also known as a single-sided dual-layer DVD, was developed to expand the storage capacity of standard DVDs without changing their physical size. By using two data layers on one side of the disc, it could hold up to 8.5 gigabytes of data, nearly double the 4.7 GB capacity of a single-layer DVD. This advancement allowed longer movies, extended editions, or high-quality video and audio to fit on a single disc without requiring compression that might reduce quality. The second data layer is semi-transparent, enabling the laser to focus through the first layer and read information on the second. While the switching process between layers could sometimes cause a slight pause during playback, this was generally minor and accepted by users. Dual-layer DVDs became especially popular in the film industry, allowing entire feature films plus bonus content to fit on one disc. They were also used for video games, software distribution, and data archiving. Although later overshadowed by Blu-ray discs and digital streaming, the DVD (2 layer, 1 side) represented a major step forward in optical media, striking a balance between higher capacity and broad compatibility with most DVD players.