Word Count : 501

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A disk in an operating system consists of multiple platters, each having two surfaces coated with a magnetic material. Data is stored in concentric circles known as tracks, which are further divided into smaller units called sectors. A group of tracks at the same position across multiple platters forms a cylinder. The disk has a read/write head that moves across the tracks to access data, and these heads are attached to a single moving arm, making it necessary to move them in unison.

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