Patent ID: 7783916

Claim:
An optical disc apparatus which records and reproduces content data of an optical disc, comprising: identification-information acquisition means for acquiring disc identification information of the optical disc; control means; and complementation-data storage means including a database for defective data in which optical disc addresses of unreadable defective data are stored for the respective disc identification information items, and for storing therein complementation data corresponding to the defective data, in linkage with said database for the defective data; characterized in that: said control means searches said database for the defective data, on the basis of the identification information of the optical disc before the reproduction in a reproduction mode of the optical disc, so as to confirm if the address information of the defective data exists in that area of the optical disc which is to be read out from this time forth; and in a case where the address information of the defective data is contained in that area of the optical disc which is to be read out from this time forth, the content data is complemented with the complementation data which is previously recorded in said complementation-data storage means, wherein, when said control means has failed to read out the data of the optical disc a predetermined number of times or for a predetermined time period, it recognizes the data of the corresponding part as the unreadable defective data and records the optical disc address of the defective data in said database for the defective data.