Hard disk. View of the read/write head (far right) of a computer hard disk memory mechanism. The rigid hard disk (orange) is coated on both sides with magnetic material: the direction of magnetisation of small localised areas of the disk represents the stored information in binary digits. Information is written and accessed by means of small electromagnets in the read/write head. The disk rotates on a central spindle (upper left) and the head moves radially to access different parts of the disk.
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