August 2011
Intermediate to advanced
312 pages
12h 13m
English
Content preview from Digital Storage in Consumer Electronics
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58 Chapter 3
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laser beam minimum spot size regulates storage capacity similar to transistor densities
in Moore’s law for semiconductors. Conventional CD and DVD optical drives use
infrared (780 nm) and red lasers (650 nm), respectively. Infrared and red laser light has
a longer wavelength than blue laser light (405 nm) used for Blu-ray and HD DVD
optical drives. A shorter wavelength yields a smaller laser spot represented by a smaller
Numerical Aperture (NA), which in turn permits a smaller size recorded bit and tighter
track pitches, and thus higher density recording. CDs and DVDs have nominal storage
capacities of 650 ...
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