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 terms "hard drive" and "hard disk" are synonymous; however, a "drive" technically refers to the entire unit that holds one or more "disk" platters. The word "hard" came about to refer to the rigid platters made of aluminum or glass in contrast to floppy disks made of flexible plastic. See hard disk and floppy disk.