The Optic Medias (CD ROM's and DVD)
CD ROM and DVD are optic readable media, contrary to hard disks, floppy disks and tapes, which are magnetic.
The optic storage media are read with a very thin and very precisely aimed laser beam. They supplement the magnetic media.
They have clear advantages in the areas of data density and stability: Data can be packed much more densely in an optic media
than in a magnetic media. And they have much longer life span. It is presumed that a magnetic media, such as a hard disk or DAT
(digital audio tape) can maintain their data for a maximum of five years. The magnetism simply fades away in time. Conversely, the
life span of optic media is counted in tens of years.
Let us take a closer look at these disks, which are becoming increasingly popular for all types of information, education and
entertainment. There are different types:
CD ROM and DVD are optic readable media, contrary to hard disks, floppy disks and tapes, which are magnetic.
The optic storage media are read with a very thin and very precisely aimed laser beam. They supplement the magnetic media.
They have clear advantages in the areas of data density and stability: Data can be packed much more densely in an optic media
than in a magnetic media. And they have much longer life span. It is presumed that a magnetic media, such as a hard disk or DAT
(digital audio tape) can maintain their data for a maximum of five years. The magnetism simply fades away in time. Conversely, the
life span of optic media is counted in tens of years.
Let us take a closer look at these disks, which are becoming increasingly popular for all types of information, education and
entertainment. There are different types:
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