Sanyo Electric Co. said on Monday that it has created a new blue-violet semiconductor laser that might hold the key to the future of Blu-ray. According to the information given by the company, this laser can emit a beam of 450 milliwatts, which is about double the power of Sanyo's current highest-power laser for Blu-ray Disc systems. 
The higher power means it can write and read data on discs with up to four data layers and at speeds of up to 12X, Sanyo said. Each recording layer on a Blu-ray Disc can store 25GB of data, and the highest-capacity commercial discs currently have two recording layers.
A four-layer disc would be able to hold 100GB of data, enough to store up to eight hours of 1080p video content. At 12x recording speed writing a four layer 100GB Blu-ray disc will take just around 10 minutes. That's the good part, unfortunately approving the 12x laser from the Blu-ray Disc Association and putting it into mass production can take two or even three years.
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