Meaning of DVD
What is DVD:
A DVD is an optical disc for the digital storage of images, sounds and data, with greater capacity than a compact disc or CD.
DVD stands for Digital Versatile Disc, English expression that we can translate as "digital versatile disc".
DVD was introduced to the market for the first time in 1995, at which time it was especially conceived as a video medium that would replace VHS. For this reason, originally the acronyms corresponded to the term digital video disk.
The benefits of DVD as a storage device for all kinds of digital data were quickly understood and exploited, which has led to the development of various types of DVD according to user requirements.
DVD General Features
- It has a standard measurement of 120 mm in diameter.
- Its signal is digital.
- As a read / write mechanism it requires the red laser.
- Allows you to save information with a high level of quality.
- Stores much more information than a CD.
- The capacity of a DVD varies from a minimum of 4.7 GB to 17.1 GB.
DVD was originally conceived for the transmission of high-quality audiovisuals. As we have said, it competed with VHS tapes, nowadays disappeared from the market.
However, its development allowed several uses, such as video and audio storage, interactive applications, support for software, handling of backup copies or backup, etc.
See also Backup.
According to capacity and format
The capacity of a DVD as well as its use, depends on its conformation. Some are made up of a single layer or a double layer. Single-layer DVDs have 4.7 GB of data; the double layer ones have a storage capacity of approximately 8.55 GB. A comparison table will, however, give us a clearer idea of the quantity and diversity of DVDs that are available on the market:
There are also double-sided DVDs, that is, they can be written on both sides, allowing increased storage capacity. These can reach up to a capacity of 17.1 GB. Among them are the models known as DVD 10, DVD 14 and DVD 18. Let's see:
According to the content
In common parlance, DVDs are usually classified according to the type of content they store. Thus, it is spoken of:
- Video DVD;
- Audio DVD;
- Data DVD.
The latter allows you to save all kinds of files, including text files, such as a pentdrive or an external hard drive.
See also Cloud (computing).
Advantages and disadvantages of DVD
Among the advantages of DVD we can mention that it allows you to store a lot of data avoiding the excessive use of computer space, it also allows you to store high quality video and audio, which makes it excellent for collecting movies; they take up little physical space; the price of blank DVDs is inexpensive; it does not degrade over time and can be played on various devices.
Among their disadvantages we can mention that they require physical distribution; the constant updating of the DVD makes the reading equipment no longer compatible with the new discs. Also, DVD recorders are often expensive. Finally, although they are easy to store and take up much less space than a VHS tape, they always take up some space that can be made available for other uses.
Today DVDs face the onslaught of other devices with greater storage capacity and better sound and image quality, such as HD DVD and Blue ray. In addition, their use as data storage devices competes with the cloud and other backup systems. It is not surprising that many computers today do not include a DVD player.