Optical storage media.
Optical storage media is so called because of the way in which data is written to the various media
types involving the use of different types of lasers on the surface of the disc itself.
Although it may be somewhat difficult to distinguish various optical discs if there are no default labels
on them, they do have slight differences in color and hue due to the size of the lasers used to write
data to them.
Compact Discs.
CDs are made of pits and lands noticeable as bumps on the underside of the disc, coated with a thin
layer of aluminum which results in a reflective surface.
Data is written in concentric circles, further split up into sectors of 512 bytes, each known as tracks
on the CD.
From the inside to the outside or edge of the disc.
Diameter 120mm.
Um Type of laser used to write data 780 nanometer annum.
Infrared laser maximum capacity of a CD 650 to 700 MP.
The various types of CDs are as follows.
Compact disc Read only Memory.
CD-Rom.
This disc comes with data on it in the form of programs, games, music and so on, and can only be
read from compact disc recordable Cd-r.
Data can be written to this disc, but only once.
Compact Disc Rewritable CD review data can be written to this disc many times.