Two companies, working with a Japanese government agency, are on track to make available a 12-centimeter optical disk which holds 25 times more data than a 4.7Gb DVD disk.
Sharp, TDK and The National Institute of Advanced Industrial Science and Technology (AIST) claim to have developed a technology which uses a red laser beam, similar to those used for making optical disks.
The researchers believe if they are able to make the dot size smaller, they can put more dots on the disc and it will hold more data.
According to the three companies, the size of laser spot has been narrowed by using heat generated by the laser beam without changing the laser's wavelength.
Until now, engineers needed to use shorter-wavelength lasers, such as blue lasers, to get smaller dots.
The Japanese team said they have succeeded in registering a dot size as small as 85 nanometers, using a common red laser beam. And the same type of laser would create a 400-nanometer dot, according to AIST.
The researchers have demonstrated that the technology can store up to 125Gb on a 12-centimeter disk.
They expect commercialisation to be possible in about four years.
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