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Magnetic storage is a durable and nonvolatile way of recording analog, digital, and alphanumerical data. In most applications, an electric current is used to generate a variable magnetic field over a specially prepared tape or disk that imprints the tape or disk with patterns that, when “read” by an electromagnetic drive “head,” duplicates the wavelengths of the original signal. Magnetic storage has been a particularly enduring technology, as the original conceptual designs were published in the late nineteenth century.