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).
 DVD |
|---|
| instantia de: physical media format[*], audio release format[*] |
| subclasse de: optical disc[*], machine-readable medium[*] |
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| precedite per: VHS, disco compacte, LaserDisc[*] , succedite per: Blu-ray Disc[*] |
| Commons: DVD |
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[1], 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.[2][3]
Capacitate de DVD
| Designation | Partes | Layers (total) | Diametro | Capacitate | ||
|---|---|---|---|---|---|---|
| (cm) | (GB) | (GiB) | ||||
| DVD-1[6] | 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[7] | 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 ‘-’:
| 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
- Bennett, Hugh (April 2004). Understanding Recordable & Rewritable DVD. Optical Storage Technology Association. Recuperate le 2006-12-17.
- Labarge, Ralph. DVD Authoring and Production. Gilroy, Calif.: CMP Books, 2001. ISBN 1-57820-082-2.
- Taylor, Jim. DVD Demystified, 2nd edition. New York: McGraw-Hill Professional, 2000. ISBN 0-07-135026-8.
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 Archived 2008-11-05 at the Wayback Machine from the Consumer Electronics Association
- How Stuff Works - DVD
Referentias
Patrono:Video storage formats