Dual Layer

Mirror Dual Layer Media offers 8.5GB of storage capacity, that’s twice the storage capacity of 1 DVD-R/DVD+R
With the higher capacity, consumers can store up to nearly 4 hours of DVD-quality video (nearly 8 hours of VHS-quality video) or 8.5GB of data on a single side while maintaining read compatibility with the majority of today’s DVD players and DVD-ROM.

Blu-Ray

Blu-ray Disc is the next-generation optical disc format that was developed to enable recording and playback of high-definition video (HD), as well as storing large amounts of data. A single-layer Blu-ray Disc can hold 25GB, which can be used to record over 2 hours of HDTV. Blu-ray uses a blue-violet laser to read and write data while current optical disc technologies such as DVD use a red laser. The shorter wavelengths of the Blu-ray technology make it possible to record more data on the same space.