Hard disk is coated in both side with
A) Carbon layer B) Magnetic metallic oxide C) Optical metallic oxide D) All of the above
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magnetic metallic oxide is your answer
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As of 2015, laptop hard drive platters are made from glass while aluminum platters are often found in desktop computers. In disk manufacturing, a thin coating is deposited on both sides of the substrate, mostly by a vacuum deposition process called magnetron sputtering. And it is coated with Magnetic metallic oxide.
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