1 - An intense laser beam focused on the disc surface, consisting of a crystalline metal alloy with a few atoms
thick.
The alloy, which polarizes light, overlying a substrate of aluminum.
Both alloy as the substrate lie between two
plastic layers.
Laser Plastic Aluminum Alloy Plastic.
2 - The laser beam heats a tiny spot grade alloy than the critical temperature known as the Curie point.
At the Curie point - which varies according to the material - the alloy crystal (alloy) are released in sufficient quantity
that can be attracted by the magnetic field.
3 - A recording head, similar to conventional disk drives, creates a magnetic field that aligns the crystals
league in one direction to represent the bit 1, and in another direction to represent the bit 0.
The area affected by beam
laser is so small that it can store up to 500MB of data on a single side of the disc 5 1/4 inches.
Source: Evolution of Computers
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