Share this item with your network: CD-ROM Compact Disc, read-only-memory is an adaptation of the CD that is designed to store computer data in the form of text and graphics, as well as hi-fi stereo sound.
History[ edit ] American inventor James T. Russell has been credited with inventing the first system to record digital information on an optical transparent foil that is lit from behind by a high-power halogen lamp. Prototypes were developed by Philips and Sony independently in the late s.
After their commercial release incompact discs and their players were extremely popular. The unified design of the compact disc allowed consumers to purchase any disc or player from any company, and allowed the CD to dominate the at-home music market unchallenged.
His team developed a digital PCM adaptor audio tape recorder using a Betamax video recorder in After this, in the leap to storing digital audio on an optical disc was easily made. A week later, on 8 March, Philips publicly demonstrated a prototype of an optical digital audio disc at a press conference called "Philips Introduce Compact Disc"  in EindhovenNetherlands.
Led by engineers Kees Schouhamer Immink and Toshitada Doithe research pushed forward laser and optical disc technology. First published inthe standard was formally adopted by the IEC as an international standard inwith various amendments becoming part of the standard in Philips coined the term compact disc in line with another audio product, the Compact Cassette and contributed the general manufacturing processbased on video LaserDisc technology.
Philips also contributed eight-to-fourteen modulation EFMwhich offers a certain resilience to defects such as scratches and fingerprints, while Sony contributed the error-correction method, CIRC. The Compact Disc Story,  told by a former member of the task force, gives background information on the many technical decisions made, including the choice of the sampling frequency, playing time, and disc diameter.
The task force consisted of around four to eight persons,   though according to Philips, the compact disc was "invented collectively by a large group of people working as a team.
The new audio disc was enthusiastically received, especially in the early-adopting classical music and audiophile communities, and its handling quality received particular praise.
As the price of players gradually came down, and with the introduction of the portable Discman the CD began to gain popularity in the larger popular and rock music markets.
One of the first CD markets was devoted to reissuing popular music whose commercial potential was already proven. An advantage of the format was the ability to produce and market boxed sets and multi-volume collections.
From its origins as a musical format, CDs have grown to encompass other applications. By the early s, the CD player had largely replaced the audio cassette player as standard equipment in new automobiles, with being the final model year for any car in the United States to have a factory-equipped cassette player.
The demonstration showed that it is possible by using digital optical recording and playback to reproduce audio signals with superb stereo quality.
This research at Philips established the technical standard for digital optical recording systems. Relevant discussion may be found on the talk page."The compact disc is the hit of the decade in the computer industry," explained Andrew Toller, the director of a company that conducted research on the computer industry.
Tiwanaku pottery depicts quipu storage device. Record keeping system used by the Incas is more than 4, years old.
Optical drives retrieve and/or store data on optical discs like CDs, DVDs, and BDs (Blu-ray discs), any of which hold much more information than previously available portable media options like the floppy disk.
An optical drive is a piece of computer hardware about the size of a thick soft cover. A CD-ROM (/ ˌ s iː d iː ˈ r ɒ m /) is a pre-pressed optical compact disc which contains data.
The name is an acronym which is short for " Compact Disc Read-Only Memory ". Computers can read CD-ROMs, but cannot write to .
Before you write a CD you must determine whether or not the computer you're using has a CD-ROM/DVD-ROM drive that supports CD-R/CD-RW or DVD-R/DVD-RW formats. The face plate of the CD-ROM/DVD-ROM drive will usually display a logo for all the formats the drive will recognize.
Secondary storage, sometimes called auxiliary storage, is storage separate from the computer itself, where you can store software and data on a semi permanent basis. Secondary storage is necessary because memory, or primary storage, can be .