These are actually made to replace floppy disks that were used to store files and programs from the computer. The CDs eventually caused the floppy disks to become obsolete.
CDs were invented by Philips and Sony independently, but they did collaborate to create a standard format and related player technology CD player in CDs can hold up to MB worth of data, which is approximately 80 minutes of audio. Mini CDs have also been crated that can store approximately 24 minutes of audio or program drivers.
All of these CDs are used for different purposes. Standard CDs are commonly used to store songs, data, drivers, programs, etc.
DVDs are similar to CDs and are also an optical disc storage device. These were developed independently by Philips, Sony, Toshiba, and Panasonic in The difference in formats caused the companies to come together and set up standards for maintaining one type of format, which resulted in the formation of DVD.
However, many CD-players could not read DVDs, which meant that people would specifically have to go and buy these players. DVDs allowed users to hold data up to It was a suitable replacement for the magnetic disk as it offered the low-cost solution for storing a significant amount of data. The CDs first layer is constructed by the polycarbonate plastic which stores the data in the indented pits.
This layer also provides a clear glass base. The flat or unindented area is known as the land. The thin aluminium material covers the programmed disk, and a protective acrylic then coats this aluminium layer.
In the last part, the disk is stamped by a label. The pits are organised into the spiral track, in the outward direction from the middle of the disk, though decreasing the risk of damage by storing the index information at the start of the disk. The stored bits are read through targetting the laser light on to the polycarbonate part of the spinning disk. Indented portion of the disk reflects back the light which is detected by the photodetector.
It renders videos with excellent picture quality and random access. A DVD is built from the same material as the CD but the process and the layers are different, it is used from both of the sides such as two CDs are sticking together. For this technique to work, the lower layer of pits is semitransparent so that the laser can read through it to the upper layer. This technique doubles the capacity of the disc. A newer, more expensive DVD format is Blu-ray , which is a higher capacity and better quality than standard DVDs, especially for high-definition audio and video.
Figure compares the current storage capacities of DVD and Blu-ray media. Similarly, the mini Blu-ray Disc, which is used primarily in digital video recorders, stores approximately 7. Difference Between Motherboard and Chipset. You must be logged in to post a comment.
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