What are the differences of HD-DVD, Blu-ray and UMD?
• HD-DVD (High-Definition/Density Digital Versatile Disc) is a digital optical media format which is being developed as one standard for high-definition DVD. • Blu-ray format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. While current optical disc technologies such as DVD, DVD±R, DVD±RW, and DVD-RAM rely on a red laser to read and write data, the new format uses a blue-violet laser instead, hence the name Blu-ray. • UMD (Universal Media Disc) is a disc format created by Sony for the PlayStation Portable. Each of these formats requires that you have the corresponding player.
