Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Optical_disc> ?p ?o }
- Optical_disc abstract "In computing and optical disc recording technologies, an optical disc (OD) is a flat, usually circular disc which encodes binary data (bits) in the form of pits (binary value of 0 or off, due to lack of reflection when read) and lands (binary value of 1 or on, due to a reflection when read) on a special material (often aluminium ) on one of its flat surfaces. The encoding material sits atop a thicker substrate (usually polycarbonate) which makes up the bulk of the disc and forms a dust defocusing layer. The encoding pattern follows a continuous, spiral path covering the entire disc surface and extending from the innermost track to the outermost track. The data is stored on the disc with a laser or stamping machine, and can be accessed when the data path is illuminated with a laser diode in an optical disc drive which spins the disc at speeds of about 200 to 4,000 RPM or more, depending on the drive type, disc format, and the distance of the read head from the center of the disc (inner tracks are read at a higher disc speed). Most optical discs exhibit a characteristic iridescence as a result of the diffraction grating formed by its grooves. This side of the disc contains the actual data and is typically coated with a transparent material, usually lacquer. The reverse side of an optical disc usually has a printed label, sometimes made of paper but often printed or stamped onto the disc itself. Unlike the 3½-inch floppy disk, most optical discs do not have an integrated protective casing and are therefore susceptible to data transfer problems due to scratches, fingerprints, and other environmental problems.Optical discs are usually between 7.6 and 30 cm (3 to 12 in) in diameter, with 12 cm (4.75 in) being the most common size. A typical disc is about 1.2 mm (0.05 in) thick, while the track pitch (distance from the center of one track to the center of the next) ranges from 1.6 µm (for CDs) to 320 nm (for Blu-ray discs).An optical disc is designed to support one of three recording types: read-only (e.g.: CD and CD-ROM), recordable (write-once, e.g. CD-R), or re-recordable (rewritable, e.g. CD-RW). Write-once optical discs commonly have an organic dye recording layer between the substrate and the reflective layer. Rewritable discs typically contain an alloy recording layer composed of a phase change material, most often AgInSbTe, an alloy of silver, indium, antimony, and tellurium.Optical discs are most commonly used for storing music (e.g. for use in a CD player), video (e.g. for use in a Blu-ray player), or data and programs for personal computers (PC). The Optical Storage Technology Association (OSTA) promotes standardized optical storage formats. Although optical discs are more durable than earlier audio-visual and data storage formats, they are susceptible to environmental and daily-use damage. Libraries and archives enact optical media preservation procedures to ensure continued usability in the computer's optical disc drive or corresponding disc player.For computer data backup and physical data transfer, optical discs such as CDs and DVDs are gradually being replaced with faster, smaller solid-state devices, especially the USB flash drive. This trend is expected to continue as USB flash drives continue to increase in capacity and drop in price. Additionally, music purchased or shared over the Internet has significantly reduced the number of audio CDs sold annually.".
- Optical_disc thumbnail CD_drive_lens.jpg?width=300.
- Optical_disc wikiPageExternalLink 139.
- Optical_disc wikiPageExternalLink blopticaldisk.htm.
- Optical_disc wikiPageExternalLink 2002103322_cdman29.html.
- Optical_disc wikiPageExternalLink russell.html.
- Optical_disc wikiPageExternalLink Reference_Guide_for_Optical_Media.pdf.
- Optical_disc wikiPageExternalLink thomson-csf-1980.html.
- Optical_disc wikiPageExternalLink CDandDVDCareandHandlingGuide.pdf.
- Optical_disc wikiPageExternalLink www.osta.org.
- Optical_disc wikiPageExternalLink www.romeyn.ca.
- Optical_disc wikiPageExternalLink russell.html.
- Optical_disc wikiPageID "41458".
- Optical_disc wikiPageLength "25918".
- Optical_disc wikiPageOutDegree "146".
- Optical_disc wikiPageRevisionID "679083354".
- Optical_disc wikiPageWikiLink 44,100_Hz.
- Optical_disc wikiPageWikiLink AgInSbTe.
- Optical_disc wikiPageWikiLink Alloy.
- Optical_disc wikiPageWikiLink Aluminium.
- Optical_disc wikiPageWikiLink Analog_video.
- Optical_disc wikiPageWikiLink Antimony.
- Optical_disc wikiPageWikiLink Archival_Disc.
- Optical_disc wikiPageWikiLink Atlanta.
- Optical_disc wikiPageWikiLink Bit.
- Optical_disc wikiPageWikiLink Blu-ray.
- Optical_disc wikiPageWikiLink Blu-ray_Disc.
- Optical_disc wikiPageWikiLink CD-R.
- Optical_disc wikiPageWikiLink CD-ROM.
- Optical_disc wikiPageWikiLink CD-RW.
- Optical_disc wikiPageWikiLink CD_player.
- Optical_disc wikiPageWikiLink Category:Compact_disc.
- Optical_disc wikiPageWikiLink Category:DVD.
- Optical_disc wikiPageWikiLink Category:Optical_computer_storage_media.
- Optical_disc wikiPageWikiLink Category:Optical_disc_authoring.
- Optical_disc wikiPageWikiLink Category:Optoelectronics.
- Optical_disc wikiPageWikiLink China_Blue_High-definition_Disc.
- Optical_disc wikiPageWikiLink Codec.
- Optical_disc wikiPageWikiLink Compact_Disc.
- Optical_disc wikiPageWikiLink Compact_Disc_player.
- Optical_disc wikiPageWikiLink Compact_disc.
- Optical_disc wikiPageWikiLink Compact_disk.
- Optical_disc wikiPageWikiLink Computing.
- Optical_disc wikiPageWikiLink Constant_angular_velocity.
- Optical_disc wikiPageWikiLink Constant_linear_velocity.
- Optical_disc wikiPageWikiLink DIVX.
- Optical_disc wikiPageWikiLink DVD.
- Optical_disc wikiPageWikiLink DVD-Audio.
- Optical_disc wikiPageWikiLink DVD-R.
- Optical_disc wikiPageWikiLink DVD-RW.
- Optical_disc wikiPageWikiLink DataPlay.
- Optical_disc wikiPageWikiLink Data_compression.
- Optical_disc wikiPageWikiLink David_Paul_Gregg.
- Optical_disc wikiPageWikiLink Diffraction_grating.
- Optical_disc wikiPageWikiLink Digital_Multilayer_Disk.
- Optical_disc wikiPageWikiLink Digital_recording.
- Optical_disc wikiPageWikiLink Digital_video.
- Optical_disc wikiPageWikiLink Direct-to-disk_recording.
- Optical_disc wikiPageWikiLink Direct_to_disk_recording.
- Optical_disc wikiPageWikiLink Double-density_compact_disc.
- Optical_disc wikiPageWikiLink Double_Density_Compact_Disc.
- Optical_disc wikiPageWikiLink DualDisc.
- Optical_disc wikiPageWikiLink Enhanced_Versatile_Disc.
- Optical_disc wikiPageWikiLink Floppy_disk.
- Optical_disc wikiPageWikiLink Fluorescent_Multilayer_Disc.
- Optical_disc wikiPageWikiLink Forward_Versatile_Disc.
- Optical_disc wikiPageWikiLink GD-ROM.
- Optical_disc wikiPageWikiLink Gauss_Electrophysics.
- Optical_disc wikiPageWikiLink Gigabyte.
- Optical_disc wikiPageWikiLink MPEG-4_AVC.
- Optical_disc wikiPageWikiLink HDTV.
- Optical_disc wikiPageWikiLink HD_DVD.
- Optical_disc wikiPageWikiLink HD_VMD.
- Optical_disc wikiPageWikiLink Hard_disk_drive.
- Optical_disc wikiPageWikiLink High-definition_television.
- Optical_disc wikiPageWikiLink High_definition_optical_disc_format_war.
- Optical_disc wikiPageWikiLink Holographic_Versatile_Disc.
- Optical_disc wikiPageWikiLink Home_video.
- Optical_disc wikiPageWikiLink Indium.
- Optical_disc wikiPageWikiLink Iridescence.
- Optical_disc wikiPageWikiLink James_Russell_(inventor).
- Optical_disc wikiPageWikiLink LIMDOW.
- Optical_disc wikiPageWikiLink LS-R.
- Optical_disc wikiPageWikiLink Lacquer.
- Optical_disc wikiPageWikiLink Laser.
- Optical_disc wikiPageWikiLink LaserDisc.
- Optical_disc wikiPageWikiLink Laser_diode.
- Optical_disc wikiPageWikiLink Laserdisc.
- Optical_disc wikiPageWikiLink M-DISC.
- Optical_disc wikiPageWikiLink Magnetic_recording.
- Optical_disc wikiPageWikiLink Magnetic_storage.
- Optical_disc wikiPageWikiLink Magneto-optical_disc.
- Optical_disc wikiPageWikiLink Magneto-optical_drive.
- Optical_disc wikiPageWikiLink Micrometre.
- Optical_disc wikiPageWikiLink MiniDisc.
- Optical_disc wikiPageWikiLink Multiplexed_Optical_Data_Storage.
- Optical_disc wikiPageWikiLink Nanometre.
- Optical_disc wikiPageWikiLink National_Institute_of_Standards_and_Technology.
- Optical_disc wikiPageWikiLink Netherlands.
- Optical_disc wikiPageWikiLink Nintendo_optical_disc.