why HDDs use Neodymium magnets instead of other magnets?

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why HDDs use Neodymium magnets instead of other magnets?

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Neodymium, or specifically an alloy of Neodymium, Iron and Boron is the material with the highest magnetic field per volume.

So if you use that you can build a smaller HDD with the same properties.

because they are stronger for the same size, this means that a larger force is generated by so the read write head move faster and it improves random access speed