High-density read-only optical disc, and optical disc apparatus and method using the same

A recording medium, comprising:

• a data area including straight pits for main data;
• and
• a lead-in area including wobbled pits for control information, the wobbled pits being formed along a specific recording pattern which is included in the lead-in area and modulated by applying bi-phase modulation method,
• wherein the specific recording pattern includes both a first section where a transition is present within a predetermined period and a second section where the transition is absent within a predetermined period.

An apparatus for reading a recording medium having a lead-in area, a data area and a lead-out area, comprising:

• a pickup configured to read wobbled pits being formed along a specific recording pattern which is included in the lead-in area and modulated by applying bi-phase modulation method;
• and
• a controller configured to controls a reproduction of data read from the pickup,
• wherein the pickup is adapted to read the wobbled pits being formed along the specific recording pattern including both a first section where a transition is present within a predetermined period and a second section where the transition is absent within a predetermined period.

An apparatus for forming a recording medium having a lead-in area, a data area and a lead-out area, comprising:

• a pickup configured to form wobbled pits along a specific recording pattern in the lead-in area, the specific recording pattern being modulated by applying bi-phase modulation method;
• and
• a controller configured to control forming the wobbled pits by the pickup,
• wherein the pickup is adapted to from the wobbled pits along the specific recording pattern including both a first section where a transition is present within a predetermined period and a second section where the transition is absent within a predetermined period.