Since the DVD Forum and the Blu-ray Disc Association failed to agree on standards for high-definition 12-cm discs, a format war was under way between the DVD Forum's HD DVD (formerly "Advanced Optical Disc") standard and the Blu-ray Disc Association's Blu-ray Disc standard.
They were engaged in a format war up until February 2008, to determine which of the two formats will become the leading carrier for high-definition content to consumers.