A high-density read-only optical disc, and an optical disc apparatus and method using the same. The apparatus and method record data on a lead-in area of a high-density read-only optical disc such as a BD-ROM (Blu-ray disc ROM (Read Only Memory)) in the form of pre-pit strings associated with an HFM...http://www.google.co.uk/patents/US7830768?utm_source=gb-gplus-sharePatent US7830768 - High-density read-only optical disc, and optical disc apparatus and method using the same
