It is called a Hard Disk Drive, due to it having a stiff disk or disks inside called Platters. It is coated with magnetic material and a magnetic head to writes data to the surface to be read from.
Back when i was involved with more of a technical side in computers. I remember pulling out an 80mb hard disk drive and 1mb of ram from a server. Quite funny since now days it is in gb.
source:
http://en.wikipedia.org/wiki/Hard_disk_driveWebsite Design Melbourne
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