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Floppy Disk Signal Modulation Disclosure Number: IPCOM000061803D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09

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Geist, T Merten, RA [+details]


The percent variation in signal strength, or modulation, which is experienced about the circumference of a chromium dioxide floppy magnetic recording disk is minimized by controlling the disk's particle loading. Ideally, such magnetic recording disks are unoriented, that is, an unrecorded disk displays no preferential magnetic field in any direction in the plane of the disk. Such a disk is said to have an orientation ratio of 1.0 (where orientation ratio is defined as the squareness ratio measured in the direction of head movement, divided by the squareness ratio at an angle 90Πto this movement). Since the modulation is a function of the orientation ratio, the variation in signal strength around a recorded floppy disk approaches zero as the orientation ratio approaches a value of 1.0.