Full Form of DVD : Digital Video Disc (or) Digital Versatile Disc
DVD format can be referred to as either Digital Video Disc or Digital Versatile Disc. This technology uses an optical medium to store digital data. Although a DVD is about the same size as a CD, the DVD’s storage capacity is quite large.
There are different types of DVD depending on the use. Some are used to store different types of data, such as computer files and software programs, while others are exclusively formatted to support video playback. The DVD-Video format was originally standardized in 1995 by the association of a group of electronic giants such as Panasonic, Sony, Philips, Toshiba, etc.
There is even a double layer DVD with data stored in two layers on one side of the disc. One of the important features of a DVD drive is that it is backward compatible and therefore can even play CD-ROMs, Video CDs, CD-I discs, etc.
DVD Full Form – Additional Information
Data storage can be a big problem on computer, especially when it comes to videos and to some extent audios. Videos take up a lot of hard drive space and hence there is always the threat of disk space running out. Initially, people used CDs (compact discs) to move and store their data. However, the capacity of the CDs was not good enough to transfer a large amount of data at one time. Hence, DVDs or digital video discs or what are now known as “digital versatile discs” emerged.
DVD types
There are different types of DVD available on the market and their data storage capacity varies accordingly. These are single-sided single-layer (most commonly used), single-sided double-layer, double-sided single-layer and very rarely the double-sided double-layer type is used. The respective data storage capacities of these DVDs are 4.7GB, 8.5GB, 9.4GB, and 17.08GB. More than 4-5 movies can be stored on the most basic DVD. The initial CDs only had a capacity of 750 MB; this would mean only 1 movie per disc.
The quality of CD and DVD recording is also different. DVD uses a 650nm laser diode light wavelength in contrast to the 780nm used by CD. This shorter wavelength is responsible for more accurate data transfer, allowing more data to be written to a DVD. However, the latest Blue-ray disc outperforms DVD and uses a wavelength of 405nm and stores up to 50GB of data.
What are the different DVD formats?
DVD is a general term for a disc that stores data externally. However, they are not of the same type. There are read-only DVDs that are mainly pre-recorded movies or software DVDs that we buy from the market. The data on these discs is write-protected, that is, you cannot erase or add more data to the disc.
These discs can be played on a computer through a DVD-ROM or DVD burner, or movie DVDs can be played through DVD players that do not require a computer connection. It is easier to play a CD on a DVD-ROM or player, but the DVD cannot be played through a simple CD-ROM.
The next is DVD-R or recordable DVD. This has the provision for recording the data using a DVD burner and this is a one-time process. Once the data is written to the blank disc, it cannot be erased and is then used as a DVD-ROM. This is good for one-time data recording.
However, it is not always possible to keep writing DVDs and store many of them to access the desired data. Sometimes it makes sense to have a device that has the ability to record over and over again, replacing previously written data. Therefore, DVD-RW or rewritable discs are useful for this purpose. You can write to these discs and erase the data many times, making them more versatile for use. This is an ideal option when a person is on the go and needs to use the device in many places, collecting data from many machines and sources.
The world of DVDs
DVDs are very useful for storing data externally and, being a compact and lightweight disc, it is easy to take anywhere. Initially, DVDs were used to record videos and therefore became known as “digital video disc”. However, with the changing times, the disc is being used to record audio files, as well as software data, etc. The most popular brands of DVD manufacturers are Philips, JVC, Sony, Toshiba, Pioneer, and others.
For starters, there were two optical disc storage formats and they were the multimedia compact disc (MMCD) and the super-density disc (SD). However, there were differences of opinion between the main companies on the use of the format. Ultimately, it was decided that the disk would be enabled with the single-sided read option on the dual-layer disk, rather than having to flip it over. Now, the Optical Storage Technology Association (OSTA) has assigned ISO-13346 as the common file structure known as Universal Disk Format to be used for DVDs.
Advantages of using DVD
Digital Versatile Disc (DVD) is recorded using MPEG-2 file and compression format. This gives a higher resolution image than MPEG-1. When it comes to audio quality, the DVD-Audio format offers highly reliable DVD audio.
DVDs of software, movies, etc. commercially produced are protected by an encryption code (CSS) that prevents copying of the content. However, with CSS decryption software today it is easier to crack the code and copy the content to your hard drive, as well as remove the regional code bar, etc.
Data on DVD can be stored for a long time without damage if certain storage rules are observed. DVD has the best shelf life when stored at temperatures lower than 18 ° C (64.4 ° F) or less and a relative humidity of 40% or less. The longevity of the data on the disc also depends on the quality of the recording and the medium (the disc itself).
A world in your pocket
DVDs have revolutionized the concept of data storage to a certain extent. It has given you the freedom to have easy access to your content, audio, video, etc. Now no more locking hard drive space or keeping data on tapes, if you want the audio and video content at your disposal anytime, anywhere, all you need is the playback device and your stuff is ready for you. on an easily portable drive. The regular DVD is 12 cm in diameter and there is a mini DVD available that is only 8 cm in diameter. A typical 8cm single-layer single-sided DVD has a capacity of 1.36GB versus 4.37GB for the 12cm variety. For better viewing of good quality video and audio, it is best to store the content on a DVD.