what makes blue - ray disc different from dvd.?
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Blu-Ray discs have more storage capacity — a LOT more. A standard DVD holds 4.7 gigabytes of data. ... If that movie is longer than two hours, you need two DVDs or a double-layer DVD that can store around 9GB. On the other hand, a double-layer Blu-ray disc can hold a massive 50 GB of data
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