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What is Compact Disc & DVD?

10/1/2013 11:51:52 AM | by Anonymous

Compact Discs & Dvd

Compact disc or in short “CD” is a digital optical disc for data storage format. The format has been developed to store and play back sound recordings only but later it has been adapted for storage of data called the CD-ROM. There are several formats that has been further derived from these which include rewritable media (CD-RW), data storage and write-once audio (CD-R), super video compact disc (SVCD), video compact disc (SVCD), PictureCD, PhotoCD and enhanced music CD. The CD players and audio CDs have been available since October 1982.


They are simple looking devices considering the technology that is required to make it. The digital data can be in the form of video, audio or computer information. When they are played, the information is detected by a tightly focused light source called a laser. The standard CDs has a diameter of 120 millimeters and hold up to 80 minutes of 700 MiB data or uncompressed audio. As for the mini CDs, they have various diameters ranging from 60 to 80 millimeters and are used for CD singles that can be stored up to 24 minutes of audio and delivering device drivers.


The DVD stands for digital versatile disc and is a digital optical disc storage format that offers a higher storage capacity than the compact disc. The pre-recorded DVDs are mass produced by using molding machines that can physically stamp data onto the DVD. They are also known as DVD-Rom because data can only be read and not erased or written.


The blank recordable DVD discs (DVD+R and DVD-R) can only be recorded once using a DVD recorder and function as a DVD-ROM. The rewriteable DVDs such as DVD+RW, DVD-RW and DVD-RAM can be erased and recorded multiple times. They are used in DVD-Audio consumer digital audio format and in DVD-Video consumer digital video format. They can be stored up to 2 hours of very good quality video including audio tracks in formats like Dolby Digital, DTS, stereo, subtitles and pictures that can be played by many standalone DVD players and computers. They can also contain other types of information that may be referred to as DVD data discs too.


They are everywhere these days and are used to hold data, music and computer software. They have become the standard medium for distributing of large quantities of information in a reliable package. However, compact discs are now increasingly being replaced or supplemented by other forms of digital distribution and storage such as downloading and flash drives.


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