Why is dvd better than cd

A DVD is able to store far more data than a CD due to higher density data packing, less overhead repeated information used for error correction , multilayering 1 or 2 layers per side versus 1 layer for CD , and use of both sides of the disc. A standard size CD has a diameter of 4.

CD data is stored as indentations called "pits" that are encoded in a spiral track moulded into the disc. The areas between pits are "lands". A CD drive reads the disc via a nm wavelength laser that detects variations in reflectivity between the pits and lands.

So don't wait until it's too late. Turn all of your old memories into new digital keepsakes today! Storage Size: A DVD can store a significantly larger amount of space for movie purposes - approximately 4. Price: Since CDs have less space so it makes sense that they are also the cheaper of the two. Continue Reading. Different Types Of Tapes. The first layer of a CD is constructed of Polycarbonate plastic which is used to store the data.

The data is stored in pits indented onto the polycarbonate surface. Digital Versatile Disc DVD was invented to provide a way of storing digital data without losing the quality of the data. Since digital data is usually big, there was a need for a more effective means of storage. Compact Disc CD is a type of optical disc used for storing bits of data. The storage capacity of a typical CD is MB, where one byte comprises 14 bits.

CDs use laser light to retrieve data. The data is store in the polycarbonate layer, which is the first layer in a CD. The layer is indented with pits which are used for storing data. The distance between each pit is 0. The capacity of a regular CD is only MB commonly used for audio and program files. The capacity for storing data is from 4. Cost and Speed. Pits Layer. CDs are always single-layer and single-sided.

Laser Wavelength. The laser wavelength for reading and burning a DVD is nanometer. While the laser wavelength for reading and burning a CD is nanometer. Error correction codes. Data Transfer Rate. CD thickness is 1. DVD thickness is 0. Disc Formats. Yes, CDs eventually made floppy disks obsolete.