ANTONIO ROMERO / SCIENCE PHOTO LIBRARY ANTONIO ROMERO / SCIENCE PHOTO LIBRARY
Computer hard disc. Close-up of the internal workings of a computer's hard drive. This piece of hardware consists of a four anisotropic magnetoresistive (AMR) read-write heads (centre) above two disc platters (top right) that are spun at high speeds by a central spindle. The discs are coated on both sides with a magnetic material that transforms the disc's magnetic field into an electrical current when reading the disk, and turns the electrical current into a magnetic field when writing to the disk. An arm moves radially to move the head over the disc.
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