DVD

DVD (cognoscite como "Disco Video Digital") es un disco optic de formato de medios. Su usos principal es le video e le dato. Multe DVDs es del dimensiones equal al discos compacte (CDs) sed pote immagazinar 4.7 gigabytes o 8.5 gigabytes comparate a 800 megabytes (le capacitate del CD).

Variationes del nomine DVD describe le modo como le dato es immagazinate super le discos: le DVD-ROM ha datos qui pote leger se sed non pote scriber se, DVD-R e DVD+R permitte de scriber le datos un vice. DVD-RW, DVD+RW e DVD-RAM permitte de registrar le datos multe vices. Le longitude de unda usate per le laser standard del DVD es 650 nm, e le unda ha un color rubie.

 Historia 

In 1993, duo formatos de discos optic ha disveloppate; un esseva le MultiMedia Compacte Disco de Philips e Sony, e le altere esseva le Super Densitate Disco, de Toshiba, Time Warner, Matsushita Electric, Hitachi, Mitsubishi Electric, Pioneer, Thomson, e JVC.

Un gruppo de expertos in computator nominate le Gruppo Technical de Laboro (qui ha includite representantes de Microsoft, Sun, Dell, e multe alteres) ha votate a boycotar le duo formatos pro determinar illos a converger in un standard commun qui es nascite con le nomine DVD.

 Capacitate de DVD 
+ Capacitate e nomine Designation Partes  Layers(total)  Diametro  Capacitate  (cm)  (GB)  (GiB) DVD-1Dvd Faq   SS SL 1  1   8  1.46  1.36 DVD-2  SS DL 1  2   8  2.66  2.47 DVD-3  DS SL 2  2   8  2.92  2.72 DVD-4   DS DL 2  4   8  5.32  4.95 DVD-5   SS SL 1  1  12  4.70   4.37 DVD-9   SS DL 1  2  12  8.54  7.95 DVD-10  DS SL 2  2  12  9.40   8.74 DVD-14  DS DL/SL 2  3  12  13.24  12.32  DVD-18   DS DL 2  4  12  17.08  15.90 DVD-R 2.0  SS SL  1  1  12  4.70  4.37 DVD-R 2.0  DS SL  2  2  12  9.40  8.75 DVD-RW 2.0  SS SL 1  1  12  4.70  4.37 DVD-RW 2.0  DS SL 2  2  12  9.40  8.75 DVD+R 2.0  SS SL  1  1  12  4.70  4.37 DVD+R 2.0  DS SL  2  2  12  9.40  8.75 DVD+RW 2.0  SS SL  1  1  12  4.70  4.37 DVD+RW 2.0  DS SL  2  2  12  9.40  8.75 DVD-RAM 2.0  SS SL  1  1  12  4.70  4.37 DVD-RAM 2.0  DS SL  2  2  12  9.40  8.75* DVD-RAM 2.0  SS SL  1  1   8  1.46  1.36* DVD-RAM 2.0  DS SL  2  2   8  2.65  2.47* CD-ROM  SS SL, 74 min  1  1  12  0.682  0.635 CD-ROM  SS SL, 80 min  1  1  12  0.737  0.687 CD-ROM  SS SL  1  1   8  0.194  0.180

Un picolo differentia de formatos ‘+’ e ‘-’:
+ Capacity differences of writable DVD formats Type  Sectors  Bytes  GB  GiB DVD−R SL  2,298,496  4,707,319,808  4.71  4.384 DVD+R SL  2,295,104  4,700,372,992  4.70  4.378 DVD−R DL  4,171,712  8,543,666,176  8.54  7.957 DVD+R DL  4,173,824  8,547,991,552  8.55  7.961

 Technology 
Le DVD usa un laser con longitude de unda de 650 nm (le CD usa 780 nm e le Blu-ray Disc usa 405 nm). 

 Lege plus 

 Labarge, Ralph. DVD Authoring and Production. Gilroy, Calif.: CMP Books, 2001. .
 Taylor, Jim. DVD Demystified, 2nd edition. New York: McGraw-Hill Professional, 2000. .

 Ligamines externe 
 DVD Copy Control Association and the Content Scramble System (CSS)
 Dual Layer Explained  – Informational Guide to the Dual Layer Recording Process
 DVD Frequently Asked Questions (and Answers)
 DVDs: in the fast lane
 History of DVD technology  from the Consumer Electronics Association
 How Stuff Works - DVD

 Referentias 

Categoria:Abbreviationes
Categoria:Discos optic