DVD Region 1 - The War Of The Worlds (1953): Special Collector's Edition - Video & DVD

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1. A single-layer DVD can store 4.7 Gbyte, which is around seven times as much a standard CD-ROM. By employing a red laser at 650 nm (was 780 nm) wavelength and a numerical aperture of 0.6 (was 0.45), the read-out resolution is increased by a factor 1.65. This holds for two dimensions, so that the actual physical data density increases by a factor of 3.5. DVD uses a more efficient coding method in the physical layer. CD's error correction, CIRC, is replaced by a powerful Reed-Solomon product code, RS-PC; Eight-to-Fourteen Modulation (EFM) is replaced by a more efficient version, EFMPlus, which has the same characteristics as classic EFM. The CD subcode is removed. As a result, the DVD format is 47 percent more efficient with respect to CD-ROM, which uses a "third" error correction layer.

2. The first digitally recorded (DDD) popular music album was Bop Till You Drop by Ry Cooder, recorded in late 1978; it was unmixed, being recorded straight to a two-track 3M digital recorder in the studio. Many other top recording artists, such as Stevie Wonder, were early adherents of digital recording; Wonder adopted the technology in early 1979 for Journey Through the Secret Life of Plants and all subsequent recordings. Others, such as former Beatles producer George Martin, felt that the multitrack digital recording technology of the early 1980s had not reached the sophistication of analog systems; however, he used digital mixing to eliminate the distortion and noise that an analog master tape would introduce (thus ADD). An early example of an analog recording that was digitally mixed is Tusk by Fleetwood Mac, from 1979.