Both CD and DVD are optical storage methods with high-quality definition. CD and DVD differ in manufacturing method and size. There are a few differences between CD and DVD, as shown below.
What is a CD?
CD stands for compact disc. CDs are optical storage devices used in computers to permanently store data and information. It is an external device since it may be disconnected from the computer without using a tool. CDs are also classified as secondary memory devices since they are used to store data that the CPU is not currently processing. The CD was the first step towards the digital coding of information, employing a novel coding scheme in which a 14-bit code represents a unit of computer memory. This coding scheme is very useful in mistake detection. CDs were utilized for a long time in place of magnetic discs since they were less expensive and had significantly high storage capacity.
What is a DVD?
The acronym DVD stands for digital versatile disc. It is also an optical storage device that acts as the secondary storage medium in computers. DVD manufacture and operation are nearly identical to that of CDs. The main difference is that a regular DVD can store approximately 7 times as much data as a CD.
DVDs can render multimedia items such as videos with high image quality while also providing random access to data. In the case of DVD, the generally utilized error detection and correction algorithms include RS-PC and recording code EEMPlus.
CD Vs DVD | Difference between CD and DVD
- CD stands for compact disk, and DVD stands for Digital versatile disk.
- The acquired size of a CD is 700 MB, While the acquired size of a DVD is 4.7 GB to 17 GB.
- CDs have single layers of pits, While DVDs have double layers of pits.
- In CD, the recording layer or metal layer is close to the top of the disk, while The DVD recording layer or metal layer is close to the middle of the disk.
- The space between spiral loops is 1.6 micrometers on CD, while in space between spiral loops is 0.74 micrometers on DVD.
- The space between pits is 0.834 micrometers on CD, Space between pits is 0.40 micrometers in DVD.
- In CD, CIRC and EFMP are used as the error correction codes, whereas In DVD, RS-PC and EFMplus are used as error correction codes.
- The data transfer rate is 1.4 to 1.6 Mb/Sec in CD, while the data transfer rate is 11 Mb/Sec in DVD.
- The channel bit length in CD is 300 nanometers, Channel bit length in DVD is 113 nanometers.
- The numeric aperture of a CD is 0.45, Numeric aperture of a DVD is 0.6.
- CD thickness is 1.2 mm, whereas DVD thickness is 0.6 mm.
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