Running head: HD VERSUS BLU-RAY2IntroductionBlu-ray and HD-DVD are two formats that competed to become the next generation high-definition DVD format to replace standard DVD. The format war between HD DVD and Blu-ray Disc can be traced all the way back to 2000, when companies began experimenting with using new blue lasers in optical disc systems. What started in 2000 as technical research becamea war between the world's largest electronics companies and movie studios, leaving the consumerwith a seemingly possible choice. Eventually, Blu-ray won the war. This paper will provide a brief overview of the organizations that have developed and promoted each format, examine the benefits and drawbacks of each format for users, examine the processing hardware requirements for each format, and compare and contrast the similarities and differences of each.Development of Each FormatSimilar to the Betamax-versus-VHS format battle 25 years ago, the war for the format of the DVD movie is between Sony and Toshiba. Leclair (2006) suggest that the “Blu-ray Disc is a Sony-led format that uses a blue-violet laser, has a single layer disc storage capacity of 25GB, 50GB for a dual layer disc, and supports high definition HD TV viewing. HD-DVD is a Toshiba led format that also uses a blue-violet laser, has a single layer disk storage capacity of 15GB, 30GB for a dual layer disc, and also supports HD TV viewing”. These formats are similar, but differ in cost. The creation of the blue laser diode required for Blu-ray technology is attributed to Shuji Nakamura, a professor in the College of Engineering at University of California Santa Barbara.