The next generation beyond DVD technology is high-definition, or HD, technology. As television systems switched over to digital signaling, high-definition television (HDTV) became available, featuring much greater picture resolution than traditional television. Motion pictures are especially suited for display on wide flat-panel HDTV screens, and in 2002, as in 1994?C95, two competing (and incompatible) technologies were presented for storing video in high-definition on a CD-ROM-sized disc: HD DVD, proposed by Toshiba and the NEC Corporation, and Blu-ray, proposed by a group led by Sony. Both technologies employed a laser emitting light in the blue-violet end of the visible spectrum. The extremely short wavelength of this light (405 nanometres) allowed yet smaller pits to be traced on even more closely spaced tracks than on the DVD. As a result, a single-sided. single-layer disc had a storage capacity of 15 gigabytes (HD DVD) or 25 gigabytes (Blu-ray). "It looks creepy," said the 26-year-old, who works in public relations. She replaced it on the shelf and picked up "The Social Network," which she purchased for eight yuan, or about $1.22.
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