Digital versatile disks

Read Only media include the CD (Compact Disk), both Audio and CD-ROM (Read Only Memory) formats, and the more recently introduced DVD (Digital Versatile Disk) and DVD-ROM formats. DVD formats have a much higher data capacity than a CD-ROM, with the capacity depending on whether one or two recording layers are used. These read-only (i.e., prerecorded) media are largely the domain of entertainment and software distribution and publishing.196... 

Radiation curing is an important part in the manufacture of compacf disks and digital versatile disks (DVDs). In the production of compact disks fhe replication and formation of the protective coat may be carried out with the use of UV curing. The coatings are commonly based on methacrylates. 

Digital Versatile Disk or Digital Video Disk (DVD) is invented The Nobel Prize in Chemistry is awarded to Richard Smalley, Robert Curl, and Harry Kroto for their 1985 discovery of the third form of carbon, known as buckminsterfullerene ( bucky balls ) ... 

Optical memory devices such as compact disks (CDs) and digital versatile disks (DVDs) are becoming essential items of audio and visual media as well as of external computer memory media. In these devices, a laser beamis used to record and read information. Because the laser spot can be focused to within a 1 fxm scale, optical memory can access higher density and capacity than conventional magnetic memories can. 

Dipropylene glycol methyl ether Dipropyl ketone Divinyl benzene Digital versatile disk(s)... 

Finally, Part IV reviews miscellaneous technical developments that do not fit neatly into the scheme of the preceding parts. These concern, in particular, the application of polymers in the field of optical memories, treated in Chapter 12, which refers also to currently important data storage systems (compact disks, digital versatile disks, and blue-ray disks). Moreover, the application potential of polymers in the fields of photosensors and photocatalysts is outlined in Chapters 13 and 14, respectively. 

That technology also reduces orientations in the molding. For that reason, DVDs which are only half as thick as CDs, are produced by the injection-compression process. (DVD = Digital Versatile Disk data storage medium of greater capacity than the CD). 

DVD Digital versatile disk a disk format similar to a compact disk [see CD-ROM) but containing much more data. It was introduced in 1996. DVD disks are the same 120 mm diameter as CDs with potential capacities of up to 4.7 gigabytes for a single-sided single-layer disk. The technology involved in DVD storage is similar to that in compact disks, but more precise. The extra capacity is achieved in a number of ways. The tracks on a DVD are closer and the pits... 

The current product containing nanoscale features is the digital versatile disk (DVD). This 0.6-mm thick disk contains depressions or pits that are 320 nm wide and 120 nm deep. While DVDs are typically injection or injection compression molded in less than... 

The research on the fundamental physics and practical applications of chalcogenide glasses has rapidly grown recently. This is mostly stimulated by commercially successful products based on glasses, such as xerographic photoreceptors in copying machines and digital versatile disks. 

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