Abstract: The invention provides reference patterns marked on a non-data side of an optical disc. When the optical disc, according to the invention, is installed within an optical information recording apparatus, the reference patterns enable an optical pick-up unit of the optical information recording apparatus to register at at least one reference radial position on the no-data side of the optical disc. The at least one reference radial position is for assisting the optical pick-up unit to record a label on the non-data side of the optical disc.

Abstract: A method for forming a label image on an optical disk is provided. A label image is formed on a label layer of an optical disk by an optical disk drive. The label layer has a number of virtual tracks including a first virtual track and a second virtual track adjacent to each other. The optical disk drive includes an optical pickup head and a spindle. The optical pickup head has a laser diode. The method includes following steps. Firstly, the optical disk is deposed around the spindle, and the label layer faces the optical pickup head. Next, the optical disk is rotated, and the laser diode is moved between the first virtual track and the second virtual track, so that a laser beam emitted by the laser diode is focused on the label layer and that a spot is formed between the first virtual and the second virtual track.

Abstract: The invention provides a reliable write method of data on an optical record carrier without changing the conventional configuration of an information recording apparatus. The invention uses the errors occurred in reading ATIP codes and/or the reflected signal from the surface of the record carrier to decide if the storage unit on the record carrier is eligible to store data. The defective storage units are labeled as unrecordable.

Abstract: The invention provides a reliable write method of data on an optical record carrier without changing the conventional configuration of an information recording apparatus. The invention uses the errors occurred in reading ATIP codes and/or the reflected signal from the surface of the record carrier to decide if the storage unit on the record carrier is eligible to store data. The defective storage units are labeled as unrecordable.