What is CD ? Types of CD.
CD (Compact Disk)
Compact Disk is a special type of disc, on
which data is usually written only once
and then it can be read any number of
times. Laser (Light Amplification by
Stimulated Emission of Radiation)
technology is used to write and read data
on them. Hence they are also called optical
discs. It is a disc made of plastic, on which there is an aluminum plate on both sides.
A thin layer is covered the storage capacity
of a CD ranges from 680 megabytes
to 800 megabytes, it is often read at
a speed of 1200 kilobits per second.
These are called CD-ROM drives. There are
also compact discs available these days
that can read and write data like a normal
floppy, but require a CD-writer. Compact
discs are used only, because all types of
programs are available on these days.
It can be mainly divided into three parts
1. CD ROM (Read Only Memory)
2. CD-R (recordable)
3. CD-RW (re-writable)
2. CD - R(Recordable):- It can be written
once, after that it is read only. Writing
data in CD - R is also addressed with burn
content. In the typical multisession burn
situation, data can be written to CD-R more
than once. In this, a special device CD
Writer is used to write data.
3.CD - RW :- CD - RW In addition to reading
data, there is also a facility to write many
times. CD - Writer is also used in this to
write data. Unlike floppy and hard disks,
CDs have a spiral-shaped track similar to a
clock spring, but not a track . These tracks
are divided into small sectors. CD rotates
at a varying speed. The ever-changing
speed of the disc is adjusted in such a way
that it passes through a constant Line
Velocity.
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 Compact Disk? What Are Types Compact Disk?){kind=link}
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