Question: what is the difference between blu ray?
Answer: 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.