Definitions for optical disc
This page provides all possible meanings and translations of the word optical disc
Random House Webster's College Dictionary
Category: Computers, Radio and Television
Ref: Also called laser disc.
Category: Radio and Television
Ref: videodisc.; Compare compact disc. 1
optical disk, optical disc(noun)
a disk coated with plastic that can store digital data as tiny pits etched in the surface; is read with a laser that scans the surface
A modern data storage medium consisting of a flat disc read mechanically by illumination with laser light. Various formats include the Laserdisc, compact disc, DVD, and Blu-ray.
In computing and optical disc recording technologies, an optical disc is a flat, usually circular disc which encodes binary data in the form of pits and lands on a special material on one of its flat surfaces. The encoding material sits atop a thicker substrate 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. The pits or bumps distort the reflected laser light, hence most optical discs characteristically have an iridescent appearance created by the grooves of the reflective layer. 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. This side of the disc contains the actual data and is typically coated with a transparent material, usually lacquer. 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.
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