Hard disk drive

A hard disk drive (Short: HDD) is an electro mechanical data storage device that uses magnetic storage to store and retrieve digital data/information using one or more rotating disks, also called platters, coated with magnetic material and magnetic heads, which read and write data to the platters surfaces using electromagnetism.

The data is encoded into bits and written onto the surface of the hard disk as a series of changes in the direction of the magnetisation.

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