A hard disk, also known as a hard disk drive (HDD), is a storage device used in computers to store and retrieve digital information. It consists of one or more rotating disks, coated with magnetic material, where data is written and read by read/write heads. Hard disks offer large storage capacities, making them suitable for storing operating systems, software, documents, and multimedia files. While they have slower data access speeds compared to solid-state drives (SSDs), hard disks are typically more affordable for large amounts of storage. They have been widely used in personal computers, laptops, and servers for decades, although SSDs are increasingly replacing them in many modern devices due to their speed and durability advantages.
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