this post was submitted on 21 Jun 2023
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Bon Voyage
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All three images are from an electron microscope that has captured a section of each type disc. I don't know if they are all zoomed in the same amount but I think it is implied that they are. The black bar tells you how much they are zoomed in by showing you a line that I 1 micrometer long.
Maybe the image of the CD is the background because they want to show us the black bar from that image specifically. Perhaps they were just a bit lazy with the cropping or thought it looked cool that way.
I'm the images I can see that a DVD is a flat surface with lines of 'trenches'. That's probably how they do either a 1 or a 0.
The CD has a much larger pattern and has hills instead of trenches. The size of the pattern is probably what decides how much data you can fit on a disc, smaller is better.
The Blue Ray uses trenches, like DVD, but with a smaller pattern.
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