TDK is known to push the boundaries in storage devices, as it showed of a possible 960GB laptop drive and a 3.2TB desktop drive – yeah, you heard that right. But in preparation of the CEATEC trade show in Japan, TDK has announced that it has now pushed the boundaries in the optical storage devices world with a 10-layer, 320GB disc, and it still looks like an ordinary disc.
The disc uses a blue-violet semiconductor laser with an oscillation wavelength of 405nm and an objective lens that has a numerical aperture of 0.85 to read and write data. But most of you wouldn’t care about that; so lets make that a bit simpler to digest. The disc currently uses that blue laser that is used to read and write on a standard Blu-Ray disc.
Currently, the maximum capacity for the general population is 25GB.
But, how the hell did they manage to do that? Simple. TDK just simply increased the transmittance to more than 90 percent on the outermost layer of the disc, because every time there is a new layer added on top of the disc, it decreases the transmittance signals.
The structure of the disc will have a cover layer, where you can write on with a whiteboard or permanent marker; a hard coat layer, which protects the disc from scratches and dirt; and then the ten recording layers, with L0 being the innermost and L9 being the outermost layers. L0 is made out of a silicon copper alloy; and if you are a bit geeky, the recordings are maintained by an inorganic material composed of bismuth peroxide and germanium dioxide.
No word if TDK will actually release these new discs.