History
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Optical media types
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In the mid 1990s, commercial HDTV sets started to enter a larger market, but, there was no inexpensive way to record or play back HD content. JVC's D-VHS and Sony's HDCAM formats could store that amount of data, but were neither popular nor well-known. It was well known that using lasers with shorter wavelengths would yield optical storage with higher density. Shuji Nakamura invented practical blue laser diodes, but, a lengthy patent lawsuit delayed commercial introduction.
Read more about this topic: HD DVD
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