Comparison of high definition optical disc formats Comparison of high definition optical disc formats This article compares the technical specifications of multiple high definition formats, including HD DVD and Blu-ray Disc; two mutually incompatible, high definition optical disc formats that, beginning in 2006, attempted to improve upon and eventually replace the DVD standard. The two formats remained in a format war until February 19, 2008 when Toshiba, HD DVD's creator, announced plans to cease development, manufacturing and marketing of HD DVD players and recorders. Other high-definition optical disc formats were attempted, including the multi-layered red-laser Versatile Multilayer Disc and a Chinese made format called EVD. Both appear
Track (optical disc) a "Sequential Recording Range Information" (SRRI) field of a "Disc Management Area" (DMA). Sessions contain logical tracks, which can be split to create new tracks. A final, "invisible" session holds free space in a single logical track, called the invisible/incomplete track. When a disc is finalized or closed, the latest information in the temporary DMAs such as SRRI is taken and copied into the DMA. Track (optical disc) On an optical disc, a track (CD) or title (DVD) is a subdivision of its content. Specifically, it is a consecutive set of "sectors" (called "timecode frames" on audio tracks) on the