A computer hard drive.
An example of a hard drive is the location on a desktop computer where a person could save their research paper.
hard drive - Computer Definition
The primary computer storage device, which spins, reads and writes one or more fixed disk platters. The term "hard drive" and "hard disk" are used synonymously. Hard drives are the storage medium in desktop and laptop computers as well as all servers and mainframes throughout the world. They are also used in printers for storing fonts and print jobs as well as the classic iPod and myriad other portable and stationary computer-based devices. Although earlier removable disks encased in cartridges used similar disk media and drive technology, they were mostly called "removable drives" rather than hard drives. Years ago, the word "hard" came about to refer to rigid disks made of aluminum or glass in contrast to floppy disks made of flexible plastic. See hard drive capacity and hard disk.