Hard disk (HDD)


 A hard disk drive (HDD) is a data storage device that uses magnetic storage to store and retrieve digital information. It consists of one or more rigid disks coated with a magnetic material, and these disks are stacked on a spindle. The information is written and read using magnetic heads that float above the spinning disks. HDDs are commonly used in computers and provide non-volatile storage, meaning data is retained even when the power is off. They come in various capacities, typically measured in gigabytes (GB) or terabytes (TB), and are a fundamental component for storing operating systems, software, and user data.

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