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So I make a single DVD at home and then take my disc to a replication house, such as Panasonic, CinRam, Nimbus or Diner. Thus, I need to place it on DVD, and not only on one DVD, but on thousands for distribution. If I want to release my project to the public or exhibit it in museums across the country, I'm going to need a reliable means for viewing. Practically speaking, let's say I had a virtual reality project of 75 MB on a disc. It is the smallness of the dots that allows for the roomy storage capacity of the DVD.
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A very precise laser burns these dots-actually, incredibly small pits-on to the master DVD. A DVD similarly stores and plays information based on a particular "dot pattern" on its surface. A videotape stores and plays back information based on the physical placement and arrangement of iron oxide particles on the material of the tape. The encoding of data onto a DVD may seem like a black art, but it's really not that much different from encoding data onto a videotape. Compare that to the maximum storage space of a CD which is about 640 MB.
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So a two-minute video requires 60 MB, and a two-hour movie requires 3,600 MB. MPEG2, a format commonly used for playing video via computer, compresses one minute of visual data into about 30 MB. Indeed, a high-quality digital video requires up to 100 megabytes (MB) of data space each minute, depending on the amount of compression used.
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It can't even fit comfortably on a computer hard drive. A high-quality digital video could simply never fit onto a CD. Thus, the DVD makes sense for video and other industries in a way that the CD never could. In other words, why is the industry replacing previous storage-unit standards, including the CD (short for compact disc)? Quite simply, the DVD's storage capacity is much greater. DVDs are now rapidly making their way into American homes as the state-of-the-art entertainment option for watching Hollywood releases.īefore going into the mechanics of how a DVD works, it might be best to explain the why. Of them all, DVD, which stands for digital versatile disc, is poised to become the most popular and reliable means for storing data, especially high-quality digital video. Terms such as ZIP, CD or DVD are commonly used to describe the means available for storing and sharing information, ranging from text to audio to full-length films. The tools of technology can seem like a confusing alphabet-soup. It is the pattern of these pits burned onto a disc's surface that encodes the 1's and 0's a player translates into sound and/or images. Digital versatile discs (DVDs) can store more information than compact discs (CDs) because they have smaller pits, placed closer together.