... high definition data in a comparatively low memory space. There are two types of HD DVD disks a. One-sided disk b. Both-sided disk. Depending on the type of the disk, capacity of data storage on disk varies. The following table gives a brief idea about the storage capacity of both the types of HD DVD: - Physical size Single layer capacity Dual layer capacity 12 cm, single sided 15 GB 30 GB 12 cm, double sided 30 GB 60 GB Working of HD DVD: - HD DVD uses a blue-violet 405 nm laser to read information from the disc (DVDs use red 650 nm lasers). The shorter wavelength reduces diffraction and maintains a smaller spot size of the laser. This allows data to be read from a higher density on the disc surface. While DVDs and HD DVDs will be the same size physically, the ability to store data at a higher density results in a larger total data capacity in ...

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