SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Computer hard disk assembly. Component parts of a hard disk showing the outer aluminium casing (top), the hard disk platter and read/write head (centre), and the controller electronics (bottom). Data are stored on (written) and recalled from (read) the hard disc by changing the electromagnetism of the platter, which is coated with magnetic material. The read/write head (metal arm at centre) can move over the spinning platter 50 times per second. The electronic circuitry controls the movement of the read/write head and the motor that spins the platter. It also organizes the assembly of magnetic domains on the platter in which data are stored.
Model release not required. Property release not required.