Patent ID: 7307649

Claim:
A method for generating a non-Cartesian coordinate system for an optical disc comprising: selecting a plurality of positions on the optical disc; where the plurality of positions are selected on the optical disc as a spiral path, each position has a location on the optical disc that is specifiable to a same degree of precision by a single non-polar integral coordinate such that each position is separated from an adjacent prior position within the spiral path and an adjacent successive position within the spiral path by a first uniform distance; and, where the plurality of positions are selected on the optical disc so that the plurality of positions are organized over a plurality of concentric tracks, each position within each track has a location on the optical disc that is specifiable to a same degree of precision by two non-polar integral coordinates, such that each position is separated from an adjacent prior position within a same track and an adjacent successive position within the same track by a same second uniform distance in that any two adjacent positions on one of the tracks are separated by the same second uniform distance as any two adjacent positions on any other of the tracks are separated, and such that each position within each track is separated from an adjacent prior position on an adjacent prior track and from an adjacent successive position on an adjacent successive track by a same third uniform distance.