DVD
Let an agent explain DVDs, relay technology, formats, region coding, copy protection and preservation from technical and media history sources, describe the named formats, and distinguish DVDs from CDs, Blu-ray discs, HD DVD and streaming.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain DVDs, relay technology, formats, region coding, copy protection and preservation from technical and media history sources, describe the named formats, and distinguish DVDs from CDs, Blu-ray discs, HD DVD and streaming.
An optical disc format for digital data storage, introduced in 1995 by a consortium including Philips, Sony, Toshiba and Panasonic, storing about 4.7 GB on a single-layer 12 cm disc using a 650 nm red laser, with application formats the registry aliases name such as DVD-Video for films with MPEG-2 video, region codes and CSS copy protection, DVD-Audio for high-resolution music, and DVD-ROM for data, recordable formats DVD-R and DVD+R, collectively DVD plus-minus R, and the smaller MiniDVD; DVD covers are the packaging artwork. DVDs were succeeded by Blu-ray and streaming but remain used for archiving and physical media collections, with disc rot and scratches limiting lifespan.
What it is for: Storing video, audio and data.
It can be explain technology and formats; relay region coding and copy protection; describe named formats; relay preservation.
Distinguishing features
Red laser optical disc
Region codes
Multiple application formats
Mass-market film distribution
What it looks like
A shiny 12 cm or 8 cm disc in a plastic case with cover art.
Physical character
single-layer capacity: about 4.7 GB
laser wavelength: 650 nm
introduced: 1995 year - first players 1996 in Japan
How it is recognised
Optical disc format of 1995
DVD plus-minus R, MiniDVD, DVD cover, DVD-Video, DVD-Audio, DVD-ROM
CDs hold less and use infrared lasers; Blu-ray uses blue lasers and holds more; HD DVD was a rival format; streaming delivers over networks
Related models
is a kind of - in registry terms
succeeded - for video storage
was succeeded by -
uses - on DVD-Video
In practice
Families and kinds
DVD-Video
DVD-Audio
DVD-ROM
recordable DVD-R, DVD+R and rewritable formats
MiniDVD
Standards and regulation
DVD Forum specifications
ECMA-267 DVD-ROM standard
Copyright laws on circumvention such as the DMCA
Failure modes and hazards
Disc rot and data loss
Advising circumvention of copy protection
Region incompatibility
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What a DVD is.
Definition.
Definition
Definition.
Definition
Definition.
- What is a DVD, and how does it differ from CDs, Blu-ray, HD DVD and streaming? definition
- Is the question about playback, archiving, formats or copying, where copyright law applies? boundary
Formats
Named formats.
Formats
Formats.
- What are DVD-Video, DVD-Audio, DVD-ROM, recordable formats and MiniDVD, and what is a DVD cover? definition
- Which entry fits the specific format? action
Technology Technology.
Science.
Optics
Optical storage.
Optics
Optics.
- How do red lasers and pit sizes give DVDs more capacity than CDs? provenance
- Which references are standard? provenance
Video
DVD-Video.
Video
Video.
- How do MPEG-2, region codes and CSS work on DVD-Video? provenance
- Which sources are cited? provenance
Rights Copy protection.
Regulation.
CSS
Content Scramble System.
CSS
CSS.
- What is CSS, and what legal disputes followed DeCSS, with positions attributed? provenance
- Is the presentation neutral and free of circumvention guidance? boundary
Regions
Region codes.
Regions
Regions.
- Why were DVD region codes introduced? provenance
- Which entry fits DVD region code? action
Context Media history.
Context.
Format war
Successors.
Format war
Format war.
- How did Blu-ray defeat HD DVD, and how did streaming reduce disc sales? provenance
- Which entry fits high-definition optical disc format war? action
Archiving
Preservation.
Archiving
Archiving.
- How long do recordable DVDs last, and what do archivists recommend? provenance
- Which entry fits digital preservation? action
What the second pass must settle
- Should DVD-Audio be a separate entry?
- How should preservation guidance be linked?
- Should DVD cover be moved to packaging entries?