Patent ID: 7388826
Filing Date: 2008-06-17
Classification: G11B

Abstract:
1. An optical disc medium having a wobbled track groove comprising: a flat wobble pattern in which the amplitude of the wobble from the lengthwise direction of the track groove is zero such that the track groove is flat; a positive pulse wobble pattern in which the amplitude of the wobble from the lengthwise direction of the track groove is positive such that the track groove is wobbled in a first direction perpendicular to the lengthwise direction; and a negative pulse wobble pattern in which the amplitude of the wobble from the lengthwise direction of the track groove is negative such that the track groove is wobbled in a second direction opposite to the first direction; whereby three data values are recorded using three distinctive wobble patterns; and wherein the pulse width of the positive pulse wobble pattern and the negative pulse wobble pattern is greater than or equal to the track groove width and is less than or equal to ¼ period of a reference signal recorded to the track groove wobble pattern.