TDK stacks 10 layers on a single 320GB disc

Even though we have yet to see the long-hinted 100GB and 200GB prototype Blu-ray discs as real products, TDK is looking beyond that, ready to display 320GB ten-layer platters at CEATEC 2009 that can be read and written with current blue laser technology. Key in stacking so many layers is improving the transmittance of the outermost layer as seen above - that nearly clear one on the right doesn't require a more powerful laser to get through. The only thing we can't see? When or if any of these will actually be released.