How does a smooth little piece of plastic hold possibly like 150gb, it’s not like a hard drive or usb, it’s just a piece of plastic right?
In: Technology
There is a reflective surface on the back of the CD/DVD/BluRay. Pits are made in the plastic on that back side, and a laser is bounced off the reflective surface through the pits and to an eye. The eye reads the pits, and knows what binary data is suppose to be there (1’s and 0’s).
Think of it like old movie film. You sign a light through it, and the image is projected on the screen.
Except it’s happening with very narrow beams of light (lasers) and is bouncing off a reflective surface back to an electric eye watching.
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