 The higher-capacity discs, according to Sony, would be readable on existing Blu-ray Disc players with a firmware upgrade.This technology is later used on BDXL discs.On July 20, 2010, the research team of Sony and Japanese Tohoku University announced the joint development of a blue-violet laser, to help create Blu-ray Discs with a capacity of 1 TB using only two layers (and potentially more than 1 TB with additional layering).