Method of accessing information stored in predetermined data area on optical disc and information reproducing apparatus thereof

A method of accessing an optical disc, comprising:

• enabling a focus servo control without enabling a tracking servo control;
• and
• moving the optical pick-up unit in a first direction according to a displacement specified to make the optical pick-up unit placed at a position between a boundary of a predetermined data area and a center of the optical disc, and then moving the optical pick-up unit according to a second direction, wherein a radial direction of the optical disc includes the first direction from an outer track toward an inner track and the second direction opposite to the first direction;
• obtaining a reference signal according to a laser beam reflected from the optical disc when the optical pick-up unit is moving in the radial direction;
• and
• monitoring the reference signal to identify the boundary of the predetermined data area on the optical disc.

An information reproducing apparatus, comprising:

• an optical pick-up unit, for accessing an optical disc;
• a moving mechanism, coupled to the optical pick-up unit;
• a servo system, coupled to the optical pick-up unit, the servo system having a focus servo control and a tracking servo control;
• a control system, coupled to the servo system and the moving mechanism, for controlling the servo system to enable the focus servo control without enabling the tracking servo control and then controlling the moving mechanism to move the optical pick-up unit in a radial direction of the optical disc;
• a signal processing unit, coupled to the optical pick-up unit, for obtaining at least a first reference signal and a second reference signal according to a laser beam reflected from the optical disc when the optical pick-up unit is moving in the radial direction;
• and
• a boundary identification logic, coupled to the signal processing unit, for monitoring at least the first reference signal and the second reference signal to identify a boundary of a predetermined data area on the optical disc, wherein the boundary identification logic identifies the boundary of the predetermined data area by referring to at least a first result of monitoring the first reference signal and a second result of monitoring the second reference signal.

An information reproducing apparatus, comprising:

• an optical pick-up unit, for accessing an optical disc;
• a moving mechanism, coupled to the optical pick-up unit;
• a servo system, coupled to the optical pick-up unit, the servo system having a focus servo control and a tracking servo control;
• a control system, coupled to the servo system and the moving mechanism, for controlling the servo system to enable the focus servo control without enabling the tracking servo control and then controlling the moving mechanism to move the optical pick-up unit in a first direction according to a displacement specified to make the optical pick-up unit placed at a position between a boundary of a predetermined data area and a center of the optical disc and then move the optical pick-up unit according to a second direction, wherein a radial direction of the optical disc includes the first direction from an outer track toward an inner track and the second direction opposite to the first direction;
• a signal processing unit, coupled to the optical pick-up unit, for obtaining a reference signal according to a laser beam reflected from the optical disc when the optical pick-up unit is moving in the radial direction;
• and
• a boundary identification logic, coupled to the signal processing unit, for monitoring the reference signal to identify the boundary of the predetermined data area on the optical disc.