The CD-ROM uses small discs wrapped in plastic, similar to the compact discs of music in
which data are read by means of laser beams.
As a music CD, the CD can store huge computer
because amounts of information using light to record data in a much more compact than the method used
by magnetic heads read / write of conventional disk drives.
The computer CD also serves only
for reading, and you can not use it to record data.
The immense capacity and nature of the read-only CD-ROM, combined with the relatively low cost of
units to make them perfect way of storing large amounts of data that do not require updates
frequent.
It is common to find CD-ROM image libraries (clip art), photographs, encyclopedias, works
Complete Shakespeare and even complete sets of reference works.
The CD-ROM is also a component of
essential for multimedia systems, which use sound and video files, which are usually huge.
(An additional advantage of the multimedia features is that the CD-ROM are also able to play music CDs.)
Unlike CD turntables, the CD-ROM does not have many buttons and liquid crystal displays, except the button
used to insert and remove the disc and a single light that indicates when the disc is being read.
The CD-ROM is
controlled by a program inside the PC that sends instructions to the circuit of the controller that is on the motherboard or
a separate card installed in an expansion slot.
Together, the program and the circuit components manage high
technology.
In comparison, this process makes the conventional disk drive device rudimentary.
Source: Evolution of Computers
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