Difference Between CD and DVD

CD Vs. DVD: Find What is the Difference Between CD and DVD

Both of these are basically two different versions of an optical disk- offering high-storage and high-quality definition. They differ from each other on the basis of manufacturing methods and size. A typical DVD is capable of holding more data than a CD. It is because only one of the sides of CDs has a polycarbonate substrate. Conversely, it is present on both sides of a typical DVD. In this article, we will discuss the difference between CD and DVD in detail. But let us first know individually about them.

Both DVD and CD work on optical technology. Here, we can retrieve the data with the use of light, especially lasers. We basically concentrate a laser beam on the DVD or CD for reading the data (content) that the disk stores in the form of bits, and then it writes the available content.

What is a CD?

The term CD is an abbreviation for Compact Disk. This technology was the first step in the arena of digital coding of information- that makes use of a novel coding methodology. A 14-bit code in a CD indicates a unit of computer memory. This technique of coding conjointly assists in the detection of error. The CD, for very long, worked as an acceptable form of replacement for the memory devices. It is because they used to offer a low-priced answer to people who wanted to store big chunks of data or media.

What is a DVD?

The term DVD is an abbreviation for Digital Versatile Disk. It provides a videotape that one can utilize in a tape recorder (also known as a Video Container Recorder) along with fixed storage that one can utilize in a computer. Here, the videodisc is capable of holding about seven times more info as compared to a CD. It can also acquire videos and media with commendable image quality, and users get random access to it. The construction of a videodisc is from a similar material used in the CD, but they have different construction methods. Thus, the layers are also different per unit area. You can use a DVD from both of its edges. It makes use of EFMplus and RS-PC as codes for correcting errors.

Difference Between CD and DVD

Parameters

CD

DVD

Full-Form

The term CD is an acronym for Compact Disk.

The term DVD is an acronym for Digital Versatile Disk.

Layer of Recording

It has its metal layer or recording layer closer to the provided disk’s top.

In this, the metal layer or recording layer rather stays close to the middle section of the disk.

Size

The size of a typical CD is about 700 MB.

The size of a given DVD is about 4.7 – 17 GB in range.

Total Layers of Pits

It has a total of only one layer of pits.

It has a total of double layers of pits.

Spaces present between Pits

The total space present between the individual pits in a CD is about 0.834 (micrometer) μm.

The total space present between the individual pits in a DVD is about 0.40 μm.

Space present between Loops

The total space present between the spiral loops in a CD is about 1.6 μm.

The total space present between the spiral loops in a DVD is about 0.74 μm.

Code of Correction

CD uses the codes of EFMP and CIRC for correcting errors.

DVD uses the codes of EFMplus and RS-PC for correcting errors.

Rate of Data Transfer

The rate of data transfer in a CD is 1.4 Mbps (Megabytes per second) to 16 Mbps.

The rate of data transfer is 11 Mbps.

Length of Channel Bit

In the case of a CD, the channel bit length is 300 nm (nanometer).

In the case of a DVD, the channel bit length is 113 nm.

Thickness

A CD has a thickness of about 1.2 mm (millimeters).

A DVD has a thickness of about 0.6 mm.

Numeric Aperture

A CD has a numeric aperture of 0.45.

A DVD has a numeric aperture of 0.6.

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