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[*]
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, 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-1	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

• 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