Japan
Hardware
- Citizen Watch Co. has developed a device that facilitates the recording of data to two separate layers on one side of a DVD disc. The device corrects for spherical aberrations of light from the write laser, allowing for faithful switching between a pair of recording layers that are separated by a distance of only several microns. Because of problems with spherical aberration, present DVD recorders can only write data to a single layer. DVD discs can hold data on both sides, but users still need to flip the disk over. With double-layer recording, DVD discs will be able to store 8.5 gigabytes or more than three hours of...
