M²FM

MFM code helps data thrive. Introduced in the seventies, it's true, By IBM, a company that knew. Of frequency modulation, it came to be. Designed for magnetic storage, it was made, To speed up data, a clever trade. Data written faster, causing no trouble. Only one polarity change per bit, Ensuring efficiency, a perfect fit. While FM disks were called "single density". Used on floppy disks, big and small, And early hard drives, before the fall. Replaced by more efficient codes galore. In the world of magnetic recording today, MFM remains a thing of yesterday. Random page: ZnuA