compact disk


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compact disk

[′käm‚pakt ′disk]
(communications)
A nonmagnetic disk, usually 4¾ inches (12 centimeters) in diameter, used for audio or video recording or for data storage; information is recorded using a laser beam to burn microscopic pits into the surface and is accessed by means of a lower-power laser to sense the presence or absence of pits.
References in periodicals archive ?
The compact disk is divided into the following six traffic engineering topics: Signs and pavement markings, traffic signals, gates, parking, roadside safety, and intersections.
With the Lift aluminium storage system which is manufactured in Vienna, Austria, cassettes, compact disks and video tapes are displayed full-front in locked storage cabinets.
Here's a potential use for unwanted or damaged compact disks: Set them aside as home radon detectors.
These mathematically based "error-correcting codes" now permit clean sound reproduction even from a scratched or dirty compact disk, accurate storage of data on a computer's hard drive, and reliable data communication at low power over long distances.
To store information, they typically use a magnetic signal (e.g., on a cassette tape), an electric charge (e.g., in computer memory), or an optical pattern (e.g., on a compact disk).
Capable of packing 100 times more data into a given area than a compact disk and 300 times more bits than a conventional magnetic storage medium, this technique shows promise as a viable alternative for high-density data storage.
Resembling a compact disk, each computer-readable disk will contain myriad data on star positions, redshift measurements, and other astronomical information that previously appeared in the ASTROPHYSICAL JOURNAL or its sister publication, the ASTRONOMICAL JOURNAL.
He and Holonyak expect that companies using laser diodes in compact disk players, telecommunications and other applications will want to use this simpler approach.

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