TDKs sputtering technology played a key role in enabling the creation of the prototype 100GB Blu-ray Disc. Additionally, TDK specially designed recording materials with revolutionary characteristics to accommodate the Blu-ray Disc format's short 405nm blue-violet laser wavelength and small laser spot size, narrow track pitches and high recording densities. The materials interact with the laser with such stability that TDK has already been able to achieve 6x (216Mbps) recording speed with prototype discs.
Because Blu-ray Disc medias data tracks are quite narrow even in comparison with DVD media, precise, stable interaction between the laser and the recording material is especially critical to ensuring error-free recording and playback. To enable high density data storage, the Blu-ray Discs recording layer is close to the disc surface, separated only by a 0.1mm cover layer. As a result, the disc surface itself must function as a protective shield for the recording layer. Thats why TDK developed DURABIS, a hard coating technology that makes bare Blu-ray Disc media a reality by protecting the disc surface against common contaminants such as scratches and fingerprints.