A hard disk drive (HDD) is a data storage device that stores data on magnetic disks. It is a type of non-volatile storage, meaning that it retains data even when powered off. Hard disks are used in personal computers, servers, and other electronic devices.

Hard disks work by storing data on spinning disks, which are read and written to by a head that moves across the disk surface. Hard disks are divided into partitions, which are used to organize data. Hard disks can also be formatted to create a file system, which determines how data is stored and accessed.

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