Saturday during CEATEC 2010 in Japan, TDK Corp revealed a prototype dual-sided optical disc with a total capacity of 1 TB, trumping the current BDXL specification of 100 GB and 128 GB. One side of TDK's prototype was shown to contain 16 recording layers of 32 GB each, adding up to 512 GB per side.
According to TDK, this was accomplished by creating a disc material with a high light transmittance. "The material has already been used for part of a Blu-ray disc," the company said during the show. "So, it does not have a problem of, for example, durability."
TDK said that each layer has a light transmittance of 95.1-percent--16 layers have a light transmittance of 72.6-percent. The new disc also supports the same beam aperture (0.85) and uses the same materials as Blu-ray discs. The drawback is that--in the prototype's current state--each layer is actually thicker than a Blu-ray layer, measuring at 260μm.
"According to the specifications of the Blu-ray Disc, the thickness of a recording layer has to be 100μm or less," TDK said. "But the recording layer of the new disc is 260μm in thickness. And it causes the aberration of an optical lens."
The company added that the new disc's symbol error rate for reading data was low enough for commercialization (from 1 x 10-5 to 1 x 10-4) and would be ideal for broadcasting services, backing up data, and recording multimedia at home.