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Report
The CD-ROM (and CD-R)
File on CD-ROM and the CD-R.
Realized within the framework of the IUT, 1st year

Abstract
CD-ROM is a derivative of the "Compact Disc", and makes it possible to store many numerical information. This support is composed of a flat disc 12 cm in diameter, in its most widespread version, and consists of several layers, plastics and metal. To code binary data, the metal layer is used. This part of CD-ROM to the property to return a laser beam if one sends a laser on a plane part. On the other hand, when a hollow is crossed, an cell of 167 Nm, the laser beam is not reflected any more, and is cancelled. Thus, to code binary data, one uses hollows and dishes. One 1 will be to code by a transition, i.e. the passage of a hollow to a dish and the reverse. 0 logic will be him to code by a hollow or a dish, according to alternation. For technical reasons (precision of engraving, safety of the reading), it is necessary to have at least two bits with 0 between two 1 consecutive, and to the maximum 10 consecutive bits with zero between two bits with 1. This system of coding appèle the EFM (Eight to Fourteen Modulation). The logic design of CD-Romanian is made up of three parts. "Lead-in", in the center of CD, which contains formations describing the contents of the support, hierarchy... The zone of program contains all the files, all the binary data of the applications. Lastly, there is the zone of "Lead-out" which marks the end of CD-ROM.

Screenshot

Author
Julien Michot
Size
324ko
Date of creation
2003
Downloads
Report 173
       

FracTal Compressions RapportBD rapport-cdrom rapport-codages Contours actifs rapport de stagerapport-images Rapport_MMC_BaumWelch Contours actifs rapport de stage L-systèmes modélisation arbre 3D et plante
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