CD is the acronym for compact disc.
CD is a term that is part of the dictionary of the Royal Spanish Academy ( RAE ), arising from the English acronym that refers to a compact disc (that is, a compact disc ).
A CD, therefore, is a digitally recorded optical element used for the storage of information . You can save music, videos, text documents and any other data on a CD.
For example: “When I turned fifteen I asked my parents for a Michael Jackson CD,” “I can't find the operating system CD to install on the new computer,” “I'm going to make copies of the vacation photos on a CD.” ” .
CD history
The first CDs that were known were audio CDs , also known as CD-A ( CD Audio ) or CDDA (for the expression compact disc digital audio ). Launched on the market in the early 1980s , for many years they were the main support for music distribution.
A CD-ROM , on the other hand, is a CD that stores all types of digital information. They are generally used on computers , although they can also be read on DVD players, audio equipment and other devices.
The audio CD was born in the early 1980s.
Other types
In the same way, we must not overlook the fact that there are other types of CDs, among which we can highlight the following:
– CD-R , which is a recordable compact disc format. It has the peculiarity that it can be recorded in several sessions, but the information that is recorded can no longer be deleted or overwritten. On the market they can be found with various capacities: 650 MiB, 700 MiB, 870 MiB and 900 MiB. It is considered that the first appeared in 1988 and it is established that they are recorded at a speed of 7,800 KB/s.
– CD-RW , which means compact disc rewritable. It has the particularity of being a CD that, unlike the previous type, can be rerecorded. That is, it can be recorded on many occasions since the data it has is deleted. The origin of this CD is found in 1996, although it did not begin to be marketed until 1997. It is also interesting to know that it uses three different types of light: the reading laser, the writing laser and the erasing laser. It started out with a capacity of 650 MB, but is now available in 700 MB.
More uses of the acronym CD
It should be noted that the acronym CD can also refer to a board of directors , direct current , a sports club , a certificate of deposit and direct complement .
Cd , finally, is the symbol for cadmium (the chemical element whose atomic number is 48 ). Cd is a heavy metal of great toxicity.
In the same way, cadmium or CD can be noted that it has a bluish white color, that it is soft, that it is heavy and that it is used for very different applications. Thus it is used both as a pigment and also in the field of electroplating, in electronic batteries or in photography.