Patent ID: 7586831

Claim:
An optical data storage medium, comprising: a medium substrate having a recording surface thereon with variable optical properties; a plurality of wobbled grooves preformed on the recording surface, the plurality of wobbled grooves having a repeating configuration wherein a wobble pattern is repeated at a predetermined frequency thus providing a wobble period for the wobbled groove, provided however that the wobble pattern has at least two different wobble amplitudes, including a first amplitude and a second amplitude; wherein the recording surface is logically divided into a plurality of designated data regions with each data region including a predetermined number of wobble patterns; wherein the designated data regions have a predetermined number of address cells, each address cell having a predetermined number of wobble periods; wherein only one of the wobble periods within the address cell is a reduced wobble period having an amplitude substantially equal to the second amplitude, and wherein the remaining wobble periods have an amplitude substantially equal to the first amplitude to enable detection of the reduced wobble period with a differential detection technique; and wherein the reduced wobble period is positioned at a predetermined location within the address cell, and wherein the predetermined location is indicative of an address value for that address cell and the combined address values for a plurality of the address cells within the data region is indicative of the location on the storage media.