What is a Dual (Double) Layer DVD?
Single layer DVD burners are made from a single “dummy” layer of polycarbonate. They contain one layer of organic dye that make recording of digital information possible. A laser in a single layer DVD burner only needs to focus on this one layer to read and write data. Again, single-layer DVD burners and media can record and hold up to 4.7 gigabytes of data, which is about 1,500 to 1,600 MP3 files. Dual layer DVD burners contain two layers of organic dye. The laser within the DVD burner is capable of focusing on one layer at a time so that data from one layer is not confused with data on the other layer. Dual-layer DVDs (also known as DVD9) are the same DVDs pressed by Hollywood to distribute its collection of movies on DVD format. Because DVD9 can hold much more than a single-layer DVD, movie studios can use much less compression for both video and sound when transferring a movie from film to digital format. The result is better picture quality, better sound quality, and enough space
