CD and DVD Full Form
What is the full form of CD and DVD?
CD is Compact Disc (CD)
DVD is Digital Versatile Disc (DVD)
For long-term data and information storage in computers, various secondary storage devices, including CDs, DVDs, HDDs, etc. The operation of optical storage systems like CDs and DVDs is based on optical effects. Red LASER is used for read and write operations on CD and DVD. They do, however, differ greatly from one another in several ways.
Compact Disc (CD)
Small plastic discs called Compact Discs (CDs) are used to store and playback music or computer data. It was created by Philips and Sony in collaboration and introduced as a digital optical disc data storage format in 1982. Because they were speedier and more information-capable than floppy discs, compact discs took their place of them. Up to 80 minutes of music can fit on a CD, which has a maximum data capacity of 700 MB.
Computers utilize CDs to store data and information permanently. It may be removed from the computer without the use of any tools, indicating that it is an external storage device. As a secondary memory device that stores data that the CPU isn't currently processing, CDs are also included in this category.
For a long time, CDs were utilized in place of memory/magnetic devices. It's because they used to provide inexpensive solutions to those looking to store big amounts of data or video.
The data on a CD is read and written using laser light. When the targeted area of the CD reflects the laser beam, the photodetector can then detect it. The three most popular CD variations are CD-R (Recordable), CD-R (Read Only Memory), and CD-RW (Re-Writable).
A typical CD has a diameter of 120 mm. A CD's central hole measures around 1.5 cm. The format (CD-DA) was initially designed to store and playback sound recordings simply, but it was later modified to hold data (CD-ROM).
Digital Versatile Disc (DVD)
Digital Versatile Disc or DVD (formerly known as Digital Video Disc). It is a digital optical disc (DVD) storage format created in 1995, tested, and made public in the latter half of 1996. The media may store any type of digital data and is frequently used for computer software, other files, and video content on DVD players. Despite sharing the same size as compact discs, DVDs have a larger storage capacity.
Despite being bigger in storage capacity, it is the same size as a CD. The maximum amount of data that a conventional DVD can store is 4.7 GB, but some versions of the DVD format can store more data. Eight and a half gigabytes of data can be stored on a dual-layer DVD, which contains two data layers on one side of the disc. 9.4 GB of data is available on a dual-sided DVD(4.7 x 2). 17.1 GB of data can be stored on a DVD with two layers and two sides.
In this case, a videodisc may store almost seven times as much data as a CD. A video disc is made of the same material as a CD but is put together using a different technique.
While some DVDs are structured exclusively for movie playback, others could contain various forms of data, including computer files and software programs. In 1995, a group of electronics companies, including Sony, Panasonic, Toshiba, and Philips, standardised the initial "DVD-Video" format.
A DVD has a greater storage capacity than a CD primarily because it uses a two-sided disc, a laser beam with a shorter wavelength, and dense bit packing to pack its data.