Optical recording medium processing apparatus and seek control method therefor

An optical recording medium processing apparatus for accessing a recording medium by irradiating a light beam to the recording medium comprising:

• a carriage including a lens to guide said light bream to said recording medium for moving across tracks on the recording medium;
• a first detector for detecting a tracking error signal indicating a difference between a predetermined track and a light beam spot on the recording medium;
• and
• a second detector for obtaining a sensitivity ratio of a land to a groove of the track by using the level of a differential signal of the tracking error signal.

A control method for positioning a light beam on a target track on a recording medium comprising the steps of:

• moving a carriage including a lens to guide a light beam to the recording medium from an innermost circumferential position or the vicinity of the position of the recording medium to a direction extending across the tracks on the recording medium;
• detecting a tracking error signal indicating a difference of a position between a predetermined track and a light beam spot on the recording medium after said carriage has been moved a predetermined period of time, to obtain the tracking error signal from a track area including tracks standardized by a predetermined standard on the recording medium;
• counting the number of the tracks based on a track zero-cross pulse generated by using said tracking error signal having a predetermined level or higher;
• and
• positioning the light beam spot on a target track based on the counted number of the tracks,
• wherein, during a medium initialization process, said carriage initially moves for said predetermined period of time to pass a non-standardized area of the medium, and then starts counting the number of tracks from the beginning of a standardized area of the medium.