The Differences Between CDs and DVDs.
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Do you know the Differences Between CDs And DVDs
Even though both CD and DVD disks have the same media size and shape, the things they have in common end there. There are many different things between the two, such as what they hold and how much they can hold.
It becomes apparent how the big difference in storage capacity is achieved when you understand how data is written to a CD or DVD. By moving a laser across a spinning disc pits are burned into a spiral groove that covers the entire surface. Lasers have a wave length and the longer the wave length the bigger the pit. DVD lasers have a substantially smaller wave length than a CD laser. Consequently you can have more pits in the same amount of surface area on a DVD, which explains the large difference in storage capacity.
CDs and DVDs store everything, including audio and video, as a series of ones and zeros which means they are digital data storage mediums. Pits and lands (an area where there are no pits) represent ones and zeros. When the disc drive is reading data the laser is reflected off the lands but not off the pits. Microprocessors in the disc drive take the information from the laser and convert it into a digital format that your PC can easily understand.
The tracks of a DVD are narrower as well, which allows for more tracks per disc and translates into more capacity than a CD. The typical single layer DVD holds 4.5 GB of data, while a CD holds a mere 700 MB..
Because a DVD has smaller pits and a laser needs to focus on them the physical make up of a DVD is different to a CD. This is achieved by using a thinner plastic substrate than in a CD, which means that the laser needs to pass through a thinner layer, with less depth to reach the pits.
DVD technology also has a much faster rate of reading and processing data. The average 52X CD-ROM drive reads data at 8MB a second, while a 24X DVD drive reads at 32MB a second.
With Blu-Ray being the new kid on the block and because it has such a massive storage ability DVDs will slowly be phased out as will CDs. CDs will be available for a while yet but as Blu-Ray prices come down and storage needs continually spiral upwards I can't see them lasting forever. For more related information on CDs and DVDs in regards to packaging and marketing check out the following website Packaging CDs and DVDs.
Article Source: Articlelogy.com
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