A floppy disk is a lot like a cassette tape: Both use a thin plastic base material coated with iron oxide. This oxide is a ferromagnetic material, meaning that if you expose it to a magnetic field it is permanently magnetized by the field.
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Modern aircraft have done away with multiple instruments and have a glass cockpit. Here is how the ILS data is displayed on the glass cockpit PFD (Primary Flight Display, the upper instrument on the pilotsâ panel): The ILS component of the PFD (the rest of the PFD display has been removed for clarity).