Importance

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Abstract

An information-bearing disk (magnetic-rigid or floppy, magneto-optical-Kerr or Faraday, optical or an equivalent thereof) includes equally spaced data-storing tracks grouped in a plurality of annular zones encircling the center of the disk. The ratio of the radius of the innermost track of any given zone to the radius of the innermost track of the adjacent inner zone is a constant, k, calculated from: ##EQU1## where R.sub.o is the outer radius of the outermost zone of the disk, R.sub.i is the inner radius of the innermost zone of the disk, and N is the number of disk zones. With this arrangement of data and by rotating the disk at each one of N substantially constant speeds corresponding to the playing back of data, respectively, from each of the N zones at a fixed predetermined rate, an aggregate number of only (2N-1) individually distinct playback data rates occurs when data is read from each of the N zones.

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First Claim