DVD

Digital Versatile or Digital Video Disc is a method of storing data that has become wildly popular. A DVD can hold up to 8.5 gigabytes of information, using a method called 'dual layering'. In this way, layers of data are  stacked on top of each other to double the disc's capacity. When DVDs came out, filmmakers could finally release high fidelity movies contained on a single disc. This helped pave the way for services like Netflix and increased business for video rental stores.


DVD Demystified : Frequently Asked Questions about DVDs