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  OpticalDisc

 Sigma KEE - OpticalDisc
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OpticalDisc
This Class comprises several subclasses of disc-shaped data storage devices. Unless otherwise indicated, instances of all of these classes are generally consist of plastic discs incorporating one or more reflective layers of gold or aluminum, which is pitted by a laser to encode data.
Relationships      
Parents DigitalDataStorageDevice An instance of DigitalDataStorageDevice is an ElectronicDataStorageDevice intended to be used for storing data (information) in some digital (discrete bit) encoding scheme designed for interpretation by computers.
Children BluRayDiscA type of CompactDisc that has significantly more storage than a DVD.
 CompactDiscAn instance of CompactDisc is a flat, disc-shaped DigitalDataStorageDevice that has a reflective medium on at least one side, in which a laser is used to write and read bits of data.
 DVDAn instance of DVD (Digital Versatile Disk) is a disc-shaped DigitalDataStorageDevice similar to a CompactDisc, but with a larger storage capacity.


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