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In Blu-ray Disc, data is recorded on a single side of the disc. However, a disc can store two data layers, both at the same side. The read-out or recording laser of the Blu-ray Disc device will first read from or record to one layer, and then re-focuses on the second layer. All this is done automatically without any user interference. A double layer Blu-ray Disc can store up to 50 GB of data.
출처: www.blu-raydisc.com/Section-13634/Index.html
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| layer |
Data formatted for use in a geographic information system that represents a conherent set of real-world features, both concrete, such as rivers and abstract, such as politcal boundaries. The features in a layer must be represented as points, lines or polygons, or else as a set of continuous cells of uniform size.
출처: peters.hul.harvard.edu:8080/HGL/html/Help/glossary...
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