TEK IMAGE / SCIENCE PHOTO LIBRARY TEK IMAGE / SCIENCE PHOTO LIBRARY
Hard disc from a computer. It consists of a read- write head (centre bottom) on a hard disc (round) that is coated on both sides with a magnetic material. Information is written and accessed by means of small electromagnets in the read-write head. The disc rotates on a central spindle and the head moves radially to access different parts of the disc.
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