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An internal hard drive is a non-volatile data storage device that is housed within a computer's system unit, as opposed to external drives which are connected via cables. These drives serve as the primary storage location for a computer's operating system, applications, and user data. They typically use rotating magnetic disks to read and write data, but newer models may utilize solid-state technology (SSD) instead of mechanical parts. Internal hard drives come in various sizes, measured in gigabytes or terabytes, offering ample storage space for storing large files and multimedia content. They can be found under the category of electronics, specifically within computers and computer accessories. Their role as a crucial component in data storage devices and storage enclosures further solidifies their importance within this classification.