TDK's write-once and rewritable Blu-ray Discs feature exclusive recording materials optimized for each disc type. The high-sensitivity inorganic recording material utilized by TDK for the write-once type Blu-ray Disc is completely different than the recording materials used for CD or DVD. Composed of copper and silicon, TDK's exclusive CuSi recording material delivers remarkable, long-lasting performance. The recording material enables fast recording and playback speeds and also makes it possible to realize massive capacities through multi-layering.

For TDK's rewritable Blu-ray Disc media, a specially designed high-sensitivity phase change recording material is utilized. The material is so stable that a TDK Blu-ray Disc shows virtually no performance degradation even after it has been overwritten 10,000 times.