Dual layer DVD media is a technology that allows for the storage of more data on a single disc. The technology was first developed in 2001, and was made commercially available in 2004. Dual layer DVDs can hold up to 8.5 gigabytes of data, compared to the 4.7 gigabytes that a single layer DVD can hold.

Dual layer DVD media is created by coating a single layer DVD with an extra layer of dye. This extra layer allows for the storage of more data. The two layers are then read by a DVD player in a process that is similar …