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[-] dethmetaljeff@lemmy.ml 17 points 5 days ago

It's a phase change alloy, when writing a high powered laser is used to melt the alloy, when it cools quickly it becomes opaque. When erasing, a lower powered laser heats up the disc and returns it to its transparent state. A reading laser isn't powerful enough to change the phases at all. So, you have the idea right... just no magnets involved.

this post was submitted on 29 Jul 2025
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