An HD-DVD format that uses a 405nm-wavelength blue-violet laser technology, to
be compared with the 650nm-wavelength red laser technology in use in traditional
DVD format. The rewritable Blu-ray disc can store up to 27GB of data on a single-sided
single layer disc (compared to the traditional DVD’s 4.7GB capacity), which
is approximately 12 hours of standard video and/or more than 2 hours of High-Definition
video. It has a data transfer rate of 36Mbps. Blu-Ray is developed by a consortium
gathering Sony, Samsung, Sharp, Thomson, Hitachi, Matsushita, Pioneer + Philips,
Mistubishi and LG Electronics.