TDK Creates 320GB Disc With Blu-ray Technology
Reportedly, the media storage company has already developed a 10-layer disc capable of holding a whopping 320GB, or 32GB per layer. Better still, it's possible to write and read data on and from the disc by using a blue-violet semiconductor laser with an oscillation wavelength of 405nm and an objective lens with a numerical aperture (NA) of 0.85. We know that's probably way over your head, but here's a simple way of thinking about it: that's the same stuff we already use on Blu-ray Discs, so the write/read technology is already out there in the mainstream.
The disc is structured as follows: there's a cover layer, a hard coat layer (which protects from scratches and such), recording layers and a Si-Cu alloy layer. The company has tested the disc and has found it to be reliable enough for commercial use; in fact, it's planning to showcase the disc at the CEATEC trade show in Japan next week. Who knows--maybe digital downloads won't be the death of Blu-ray after all. Sure sounds like it has way more familiar rivals to worry about.