The primary rival to Blu-ray Disc is HD DVD, championed by Toshiba, NEC Corporation, Microsoft, and Intel. HD DVD has a lower disc capacity per layer (15 GB vs 25 GB). However the vast majority of Blu-ray titles released before 2007 are in the 25 GB single layer format while almost all HD DVD movies are in the 30 GB dual layer format. The first 50 GB release for Blu-Ray was not made until October 2006. The Blu-ray Disc version of the Adam Sandler movie Click was released on October 10 2006 as the first ever dual-layer release. So far in 2007 approx 42% of the new releases for Blu-ray movies were released in 25 GB Discs with the other 58% being released in 50 GB dual layer format.
In terms of audio/video compression, Blu-ray Disc and HD DVD are similar on the surface: both support MPEG-2, VC-1, and H.264 for video compression, and Dolby Digital (AC-3), PCM, and DTS for audio compression. The first generation of Blu-ray Disc movies released used MPEG-2 (the standard currently used in DV