Usually aluminium or glass. There’s a metallic coating applied to the outside surfaces that stores the data. That layer is very thin though, so most of the material is the substrate.
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What are they made of anyways?? Could one see any etching marks with a microscope?
They aren’t etched
Usually aluminium or glass. There’s a metallic coating applied to the outside surfaces that stores the data. That layer is very thin though, so most of the material is the substrate.
Bunch of tiny magnets either north or south.