Computer Hardware Terms, Glossary and Dictionary

Hard disk drive, also known as hard drive or hard disk, is a magnetic disk to store computer data. A hard disk uses rigid rotating platters (disks). It stores and retrieves digital data from a planar magnetic surface. Information is written to the disk by transmitting an electromagnetic flux through an antenna or write head that is very close to a magnetic material, which in turn changes its polarization due to the flux. The information can be read back in a reverse manner, as the magnetic fields cause electrical change in the coil or read head that passes over it.

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hard disk drive