magnetic substances in hard disk and drives
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For hard drives, the magnetic alloys are typically CoPtCr (cobalt+platinum+chromium) with traces of boron or tantalum added at times to improve the stability of magnetic domains.
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- Hard disk drives contain neodymium-iron-boron magnets. Their role is to control the movements of the heads that read and write data. The data is on the platters and remains unchanged. Without the presence of a powerful magnet, the information remains on the hard drive.
- The material of the main magnetic medium layer is usually a cobalt-based alloy. In today's hard drives each of these magnetic regions is composed of a few hundred magnetic grains, which are the base material that gets magnetized.
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