DVD-ROM - or Digital Versatile Disc, Read-Only Memory - refers to the original DVD format of a high capacity optical storage disc that can only be read and not written. Data is already pre-recorded on the disc by the manufacturer when it reaches the consumer. Movie rentals, retail movies and large software applications are all examples of DVD-ROMs in the global market.
DVD-ROMs are engineered for all storage capacities: single-sided single layer, single-sided double layer, double-sided single layer and double-sided double layer.
Additional layers and sides equate to more recorded data than a CD due to its higher density in binary data. The optics of a drive will look for an ADIP, or "Address In Pregroove" signal to guide the laser to reading the correct layer. DVD-ROM's data layer position in the middle of the disc enables double-sided storage.
DVD-ROM has its advantages over some of its optical storage predecessors. Consumers will experience improved color and picture quality. These discs are also capable of six and seven digital surround sound channels. They contain track skipping options, parental controls and 32 choices in closed captioning. DVD-ROM employs the MPEG-2 format for audio and video compression - a widely accepted standard for television's NTSC and HDTV options.
A drive's laser reads a DVD-ROM from the center and follows the spiral tracks outward. A DVD-ROM will be compatible with DVD players as well as drives on PCs and MACs.
Be sure to check out our pages on these other DVD formats:
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