| A Digital Video Disc or DVD is one of the
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| | requires certain authentication. Also,
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| most popular forms of storage media
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| | certain processes and rules are needed to
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| nowadays. It is an optical disc and mainly
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| | be followed to handle their production.
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| used to store videos. However, data in any
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| | Present day markets are full of illegal
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| form can be stored on a DVD. The
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| | and fake DVDs. Especially in Asia, Africa
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| dimensions of a DVD are generally the same
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| | and Brazil. So, certain security measures
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| as a common compact disc but the amount of
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| | are applied to check this illegal
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| data that can be stored is six times
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| | business. Copy prevention techniques are
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| greater.
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| | used that prevents illegal replicating of
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| The different variations of DVD are based
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| | the original disk.
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| on the way data is being stored on it. A
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| | A DVD-Video is standard for storage of
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| DVD-ROM has pre-written data that can only
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| | video content on the media. Typically the
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| be read. A DVD+R and DVD-R are the ones on
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| | format in which video is stored in the
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| which the data can be written only once;
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| | DVDs is MPEG-2, 16:9 aspect ratio videos.
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| and on a DVD+RW the data can be written
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| | The resolution used are 720*576 (PAL) or
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| and erased more than once. The lasers used
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| | 720*480 (NTSC) at 25 or 29.97 FPS. The
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| to read DVDs are typically of 650 nm
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| | audio on the disc is stored in DTS
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| wavelength.
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| | (Digital Theatre System) or AC-3 (Dolby
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| The terms DVD-Audio and DVD-Video discs
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| | Digital) formats. However, a number of
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| are DVDs with suitably structured and
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| | other resolutions and formats are also
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| formatted audio and video content
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| | supported. Other features like selectable
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| respectively. Other types of DVDs are
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| | language in subtitles, menus, multiple
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| called DVD-data discs.
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| | audio tracks and more than one camera
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| The term `DVD` is used for an unofficial
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| | angle is also supported by DVD-Video.
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| full form `digital video disc`. However,
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| | The DVD-Audio format is used to deliver
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| it was officially announced that it stands
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| | high-quality audio content. A number of
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| for `digital versatile disc`.
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| | channel configuration choices (like from
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| A typical DVD has a 4.7 GB storage
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| | mono to 5.1 or 7.1 surround sound) at a
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| capacity. These discs are one sided and
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| | number of sampling frequencies are offered
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| single layered i.e. the data is stored
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| | by the DVD-Audio. The higher storage
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| only on one side of the disc and only at
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| | capacities enable it to store a
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| one level. The size is enough for a high
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| | considerable higher amount of music or a
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| quality 133-minute movie. The double sided
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| | much higher audio quality.
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| and dual layered DVDs can store about 17
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| | Although the DVD-Audio has higher
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| GB of data in any form. The capacity
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| | technical specifications, the debate on
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| dwarfs a compact disc easily.
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| | whether the audio enhancements that are
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| The writing speeds on a DVD vary from 1350
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| | being included are actually
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| KB/s (1 x) to 26 MB/s (18 x to 20 x). For
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| | distinguishable or not in a typical
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| a CD, the speed 1 x means only 153.6 KB/s.
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| | listening environment is still on.
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| Initially, the burning or the duplication
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| | There are a number of possible successors
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| of DVD was an expensive work and required
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| | to the DVD. The strongest being the
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| skilled persons to do it. Today, the
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| | Blu-Ray Disc. Others are Maxell`s HVD
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| process of writing on a DVD has become a
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| | (Holographic Versatile Disc) and the 3D
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| piece of cake and any one with a little
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| | optical storage discs that are being
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| knowledge of computers can do it at a
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| | developed actively.
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| click of the mouse. Producing DVDs
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