Differences between CD,VCD and DVD

CD is short for Compact Disc; it refers to laser disk with a diameter of 12 cm and thickness of 1.2 cm. We usually call Laser Disk and Compact Disks as disks. But they have some differences. The image of laser disks is recorded by analogy and the audio is recorded by partial analogy or analogy mixed with digital. CD is to record and play sound and LD is to record and play image.


VCD is short for Video Compact Disc, actually means "video CD-ROM." It is the same as ordinary CD size of 120 mm in diameter. The structure is of no differences, but the above is a television show saved, and it is the so called "DVD", because it is much smaller than that used in other LS disc, so it is called "small discs." Its audio and video playback quality is better than CD, but somewhat less than the big discs. VCD discs can either be played directly in the VCD machine or configure the drive to play the computer. A VCD contains 74/80 minutes of video and audio in 650MB/700MB of the CD, and can be a different video and audio quality. VCD uses standard MPEG compression format to store video and audio. 1 use a compression standard called MPEG to store the video and audio. A VCD and VCD can be used in almost all of the computers CD-ROM, DVD-ROM with the software to play. It can also be used like a DVD, the use of menus, chapter mark.

DVD, in its early stage of development, refers to the Digital Video Disc, that is, "digital video disc." With the advances in optical disc technology, it can not only store video program, but also store music, data, along with increased use, it will be this type of CD-ROM referred to as "Digital Versatile Disc", the English name is the Digital Versatile Disc, referred to as DVD.

As we all know, MPEG-1's image is VHS-level quality. The MPEG-2 video is broadcast level image quality. As the broadcast-quality digital TV MPEG-1 can store larger amount of data than CD whose capacity despite the 650 to 700GB, still failed to meet the storage of MPEG-2 video program requirements. Addressing the MPEG-2 video program storage problems has led to the advent of DVD.

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