Scientists devised a CD with a capacity of 250 GB!!!!!

The devised CD has been made by using nanotechnology .

The Researchers from the University of Southampton use a powerful laser to etch "nanostructures" into a thin sheet of glass .

Each nanostructure is a cube roughly one micron in size and consists of platelets about 10nm in thickness which are separated by 100-200nm of space, Professor Peter Kazansky and Martynas Beresna told Reg Hardware.

When polarised light is passed through the structure, characteristics such as its radial and azimuthal polarisation - essentially, the angles at which the light wave oscillates - change.

The data is read by measuring degrees to which the output light differs from the light entering the storage structure.

Each characteristic encodes a different data set, so it's possible to store multiple data sets in the same structure. This data can be erased and rewritten with the laser too.

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