“De facto Standard”
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20 Apr → 12 May 2012

"In the mid 2000s, a format war took place between the Blu-ray Disc and HD DVD optical disc standards for storing high definition video and audio. The Conflict resembled the earlier videotape format war between VHS and BetaMax. In an attempt to avoid a costly format war, the Blu-ray Disc Association and DVD Forum started to negotiate a compromise in early 2005. On 22 August 2005, the Blu-ray Disc Association and DVD Forum announced that the negotiations to unify their standards had failed.

The format war’s resolution in favour of Blu-ray was primarily decided by two factors: shifting business alliances, including decisions by major film studios and retail distributors, and Sony’s decision to include a Blu-ray player in the PlayStation 3 video game console." – Wikipedia