how computers work

hard drive

hard drive

A hard disk drive (HDD), hard disk, hard drive or fixed disk

[b]

is a

data storage device

used for storing and retrieving

digital

information using one or more rigid ("hard") rapidly rotating disks (

platters

) coated with magnetic material. The platters are paired with

magnetic heads

arranged on a moving

actuator

arm, which read and write data to the platter surfaces.

optical drive