The DVD Forum (chaired by Sony) was deeply split over whether to go with the more expensive blue lasers or not. In February 2002, the project was officially announced as Blu-ray Disc, and the Blu-ray Disc Association was founded by the nine initial members. The two formats share several technologies (such as the AV codecs and the laser diode). Sony started two projects applying the new diodes: UDO (Ultra Density Optical) and DVR Blue together with Philips, a format of rewritable discs which would eventually become Blu-ray Disc (more specifically, BD-RE) and later on with Pioneer a format of read only discs (BD-ROM). Origins and competition from Blu-ray Disc Shuji Nakamura invented practical blue laser diodes, but a lengthy patent lawsuit delayed commercial introduction. It was well known that using lasers with shorter wavelengths would yield optical storage with higher density.
JVC's D-VHS and Sony's HDCAM formats could store that amount of data, but were neither popular nor well-known. In the late 1990s, commercial HDTV sets started to enter a larger market, but there was no inexpensive way to record or play back HD content. 1.7 Warner Blu-ray Disc replacements in the U.S.1.1 Origins and competition from Blu-ray Disc.High-Definition Versatile Multilayer Disc (HD VMD).
HD DVD: HD DVD-R, HD DVD-RW, HD DVD-RAM.Blu-ray Disc ( BD): BD-R & BD-RE, Blu-ray 3D, Mini Blu-ray Disc.DVD: DVD-R, DVD+R, DVD-R DL, DVD+R DL, DVD-R DS, DVD+R DS, DVD-RW, DVD+RW, DVD-RAM, DVD-D, DVD-A, HVD, EcoDisc, MiniDVD.Compact disc ( CD): CD-DA, CD-ROM, CD-R, CD-RW, 5.1 Music Disc, Super Audio CD ( SACD), Photo CD, CD Video ( CDV), Video CD ( VCD), Super Video CD ( SVCD), CD+G, CD-Text, CD-ROM XA, CD-i, MIL-CD, Mini CD.
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