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Platter

Platter refers to a disc within a hard disk drive. The magnetic surface of the platters within a hard drive are divided into microscopic regions, each of which holds a single binary unit of information ("1" or "0"). Usually constructed from a cobalt-based alloy, platters spin at thousands of rotations per minute, and are read by sensors, or "heads," attached to the end of a mobile arm, not unlike a record player's stylus. The head can detect and modify the changes in magnetism that represent information stored on the drive. In 2005, hard drive manufacturers began changing the actual orientation of magnetization on hard drive platters in order to increase storage density, thereby allowing more data to be stored on a platter of the same size.

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