Patent ID: 6947364

Claim:
A method for detecting inadvertent track jumps during reading or writing of data on an optical disk, the optical disk being formatted with tracks within which data is read or written and arranged in data lines, the method comprising: detecting a track jump using information in a non-addressing information portion of a data line, wherein: each data line is comprised of a portion containing addressing information for data and a portion containing non-addressing information, the non-addressing information portion being comprised of a plurality of wobble cycles and at least one inverted wobble cycle; the detecting comprising: determining a position of an inverted wobble cycle in the non-addressing information portion of a data line; comparing the determined position with an expected position of the inverted wobble cycle; and determining that the determined position does not match the expected position; and ceasing the reading or writing of data on the optical disk, wherein the detecting and ceasing are performed using information relating to only one inverted wobble cycle.