The advent of Blu-ray technology has led to the introduction of high capacity storage discs to meet the demand caused by the rapid growth of high definition television (HDTV). The Blu-ray discs get their name from blue laser technology. The shorter wavelength of the laser is the reason that it is blue in colour. The blue laser has a wavelength of 405nm compared with the wavelength of 650nm for DVD which utilises red laser technology. The benefit of having a blue laser with a shorter wavelength means it is possible to write smaller data pits and therefore vastly increase the amount of data on the disc. 2006 saw the introduction of Blu-ray and HD DVD discs. Both offer 3 to 5 times the storage capacity of a standard recordable DVD disc, enabling the recording, rewriting and playback of high definition video (HD). Blu-ray discs have a capacity of 25GB, capable of recording more than 2 hours of high definition programming.