Compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony and released in 1982. The format was originally developed to store and play only digital audio recordings but was later adapted for storage of data .
A certificate of deposit (CD) is a time deposit, a financial product commonly sold by banks, thrift institutions, and credit unions. CDs differ from savings accounts in that the CD has a specific, fixed term (often one, three, or six months, or one to five years) and usually, a fixed interest rate.
cd (elliptic function), one of Jacobi's elliptic functions; Other uses in science and technology. Cadmium or Cd, a chemical element; Candela or cd, a unit of light intensity-CD, the North American call sign suffix for Class A low-power television stations operating with digital signals; Circular dichroism, a form of spectroscopy
- CD-ROM discs
- CD-ROM format
- CD-ROM drives
- Copyright issues
A CD-ROM is a pre-pressed optical compact disc that contains data. Computers can read—but not write to or erase—CD-ROMs, i.e. it is a type of read-only memory.
CD-ROMs are identical in appearance to audio CDs, and data are stored and retrieved in a very similar manner. Discs are made from a 1.2 mm thick disc of polycarbonate plastic, with a thin layer of aluminium to make a reflective surface. The most common size of CD-ROM is 120 mm in
Several formats are used for data stored on compact discs, known as the Rainbow Books. The Yellow Book, published in 1988, defines the specifications for CD-ROMs, standardized in 1989 as the ISO/IEC 10149 / ECMA-130 standard. The CD-ROM standard builds on top of the original Red
Data stored on CD-ROMs follows the standard CD data encoding techniques described in the Red Book specification. This includes cross-interleaved Reed–Solomon coding, eight-to-fourteen modulation, and the use of pits and lands for coding the bits into the physical surface of the CD. The structures used to group data on a CD-ROM are also derived from the Red Book. Like audio CDs, a CD-ROM sector contains 2,352 bytes of user data, composed of 98 frames, each consisting of 33-bytes. Unlike ...
CD-ROM discs are read using CD-ROM drives. A CD-ROM drive may be connected to the computer via an IDE, SCSI, SATA, FireWire, or USB interface or a proprietary interface, such as the Panasonic CD interface, LMSI/Philips, Sony and Mitsumi standards. Virtually all modern CD-ROM drives can also play audio CDs when used with the right software.
Software distributors, and in particular distributors of computer games, often make use of various copy protection schemes to prevent software running from any media besides the original CD-ROMs. This differs somewhat from audio CD protection in that it is usually implemented in both the media and the software itself. The CD-ROM itself may contain "weak" sectors to make copying the disc more difficult, and additional data that may be difficult or impossible to copy to a CD-R or disc image, but w
CD-R (COMPACT DISC – Recordable) is a digital optical disc storage format. A CD-R disc is a compact disc that can be written once and read arbitrarily many times.. CD-R discs (CD-Rs) are readable by most plain CD readers, i.e., CD readers manufactured prior to the introduction of CD-R.
- Audio formats
- Types of album
An album is a collection of audio recordings issued as a collection on compact disc, vinyl, audio tape, or another medium. Albums of recorded sound were developed in the early 20th century as individual 78-rpm records collected in a bound book resembling a photograph album; this format evolved after 1948 into single vinyl LP records played at 33 1⁄3 rpm. The album was the dominant form of recorded music expression and consumption from the mid-1960s to the early 21st century, a period...
An album, in ancient Rome, was a board chalked or painted white, on which decrees, edicts, and other public notices were inscribed in black. It was from this that in medieval and modern times album came to denote a book of blank pages in which verses, autographs, sketches, photographs and the like are collected. This in turn led to the modern meaning of an album as a collection of audio recordings issued as a single item. In the early nineteenth century "album" was occasionally used in the title
An album may contain as many or as few tracks as required. In the United States, The Recording Academy's rules for Grammy Awards state that an album must comprise a minimum total playing time of 15 minutes with at least five distinct tracks or a minimum total playing time of 30 minutes with no minimum track requirement. In the United Kingdom, the criteria for the UK Albums Chart is that a recording counts as an "album" if it either has more than four tracks or lasts more than 25 minutes. Sometim
Material is stored on an album in sections termed tracks, normally 11 or 12 tracks. A music track is an individual song or instrumental recording. The term is particularly associated with popular music where separate tracks are known as album tracks; the term is also used for other formats such as EPs and singles. When vinyl records were the primary medium for audio recordings a track could be identified visually from the grooves and many album covers or sleeves included numbers for the tracks o
Commercial sheet music are published in conjunction with the release of a new album. A matching folio songbook is a compilation of the music notation of all the songs included in that particular album. It typically has the album's artwork on its cover and, in addition to sheet mu
Vinyl LP records have two sides, each comprising one-half of the album. If a pop or rock album contained tracks released separately as commercial singles, they were conventionally placed in particular positions on the album. During the Sixties, particularly in the UK, singles wer
8-track tape is a magnetic tape sound recording technology popular in the United States from the mid-1960s to the late 1970s when the Compact Cassette format took over. The format is regarded as an obsolete technology, and was relatively unknown outside the United States, the Uni
The contents of the album are usually recorded in a studio or live in concert, though may be recorded in other locations, such as at home, in the field - as with early Blues recordings, in prison, or with a mobile recording unit such as the Rolling Stones Mobile Studio.
People also ask
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What are the different types of compact discs?
The Compact Disc-Interactive (CD-I, later CD-i) is a digital optical disc data storage format that was mostly developed and marketed by Dutch company Philips. It was created as an extension of CDDA and CD-ROM and specified in the Green Book, co-developed by Philips and Sony, to combine audio, text and graphics.
Um CD é um disco de acrílico, sobre o qual é impressa uma longa espiral (22,188 voltas, totalizando 5,6 km de extensão). As informações são gravadas em furos nessa espiral, o que cria dois tipos de irregularidades físicas: pontos brilhantes e pontos escuros.
CD (av en. Compact Disc, 'kompaktskiva') är ett optiskt lagringsmedium där informationen är mekaniskt lagrad i form av gropar med varierande längd, längs cirkulära spår, vilka avläses med en laser. Lasern känner av ojämnheterna i den reflekterande ytan och omvandlar dessa till en digital signal vilken i sin tur avkodas och omvandlas till data.