• egeres@lemmy.world
    link
    fedilink
    English
    arrow-up
    2
    arrow-down
    1
    ·
    5 months ago

    What are they made of anyways?? Could one see any etching marks with a microscope?

    • Morphit @feddit.uk
      link
      fedilink
      English
      arrow-up
      4
      ·
      5 months ago

      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.