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This category revolves around various types of rotating disk computer storage media. The discs may be permanently attached to, or removable from, the computer. For large computer systems such as mainframes and server farms , the discs may be connected to a network , and thus may be situated physically distant from the computers they serve.
In a CD, on the other hand, where a focused laser beam is used in conjunction with a protective layer at the reading side of the disc, scratches and fingerprints are out of focus, and thus not detected by the reading spot. As a result, the CD/DVD method offers a great resilience against disc anomalies, offering great playability.
The Dynamic Tower (also known as the rotating tower or the Da Vinci Tower) is a cancelled 420-metre (1,378 ft), 80-floor moving skyscraper, designed by architect David Fisher. [ 2 ] [ 5 ] Similar to the Suite Vollard completed in 2001 in Brazil, [ 6 ] each floor is designed to rotate independently, [ 3 ] resulting in a changing shape of the tower.
Those 74 minutes come from the maximum playtime that the Red Book (audio CD standard) specifies for a digital audio CD (CD-DA); although now, most recordable CDs can hold 80 minutes worth of data. The DVD and Blu-ray discs hold a higher capacity of data, so reading or writing those discs in the same 74-minute time-frame requires a higher data ...
DVD lens supports a different focus for CD or DVD media with same laser. With the newer Blu-ray Disc drives, the laser only has to penetrate 0.1 mm of material. Thus the optical assembly would normally have to have an even greater focus range. In practice, the Blu-ray optical system is separate from the DVD/CD system.
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