The DWDD (Domain Wall Displacement Detection) is a media reproducing technology developed by

Canon Canon or Canons may refer to: Arts and entertainment * Canon (fiction), the material accepted as officially written by an author or an ascribed author * Literary canon, an accepted body of works considered as high culture ** Western canon, th ...

and

Sony is a Japanese multinational conglomerate (company), conglomerate headquartered at Sony City in Minato, Tokyo, Japan. The Sony Group encompasses various businesses, including Sony Corporation (electronics), Sony Semiconductor Solutions (i ...

and first implemented in a commercial product in 2004 as part of Sony's

Hi-MD Hi-MD is a magneto-optical disc-based data storage format. It was a further development of the MiniDisc. With its release in late 2004,

format. The DWDD technology uses a physics phenomenon called

domain wall displacement A domain is a geographic area controlled by a single person or organization. Domain may also refer to: Law and human geography * Demesne, in English common law and other Medieval European contexts, lands directly managed by their holder rather ...

, which shortens the masks but does not need to change the laser beam. With such technology, the density of the magneto-optical disc could be increased dramatically.

References

Optical disc authoring {{Compu-storage-stub