Blue Laser Technology

Blu-Ray and HD DVD are both types of high capacity optical storage. They are competing to be the provider of high definition movies. Traditional CDs and DVDs use a red laser to read and write data. Blu-ray discs and HD DVD, however, use a blue laser. The blue laser has a much smaller focus which allows it to store data in much smaller area. The following charts show the comparisons between CDs, DVDs, and blue laser technology.

The exciting part about blue laser technology is that it allows an entire high definition movie to be put on a single disc, which is not possible with CDs or DVDs. As far as the format war between Blu-ray and HD DVD, it is yet to be seen who will win, as both sides have major producers locked up in deals, while others are cooperating with both to try and hedge any risk in the future.

Fluorescent Discs

Fluorescent discs are an emerging optical storage solution. The concept is not brand new, a prototype was made in 2000, but the company went bankrupt after scandals. The technology, however, was purchased by another company and they renamed the concept, digital multilayer discs (DMD). Normal optical discs have a substrate that limits usability  to about two layers (hence the concept of dual layer discs). Fluorescent discs on the other hand, do not use the reflective material of traditional discs, rather a fluorescent material that allows the laser to pass through many more layers. The layers (up to 100) add much more storage capacity, and used with blue laser technology, can yield optical discs with up to a terabyte of data.

 

 

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