EE Times: "A dual-layer rewritable optical-disk technology has been developed by Matsushita
Electric Industrial Co. Ltd., one of the main technology leaders in digital video disks. Using a
set of violet lasers with a numerical aperture (NA) of 0.85 and a 0.1-mm cover layer, the
company has developed disks that have a capacity of 50 Gbytes per side, which allows the
recording of more than two hours of high-definition programs.
Matsushita plans to present the technology Friday (Oct. 19) at the International Symposium
on Optical Memory in Taipei, Taiwan."