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A Hard Disk Drive (HDD) is a data storage device used in computers and other electronics to store, retrieve, and access digital information. It consists of one or more rapidly rotating disks coated with magnetic material, which allow data to be read from and written to the drive through a read/write head. HDDs are commonly found in desktops, laptops, and servers, providing large storage capacities at relatively low cost compared to other storage technologies. They can also be used to enhance the performance of video cards by serving as additional storage for games and applications.