METHOD AND DEVICE FOR RECORDING INFORMATION VOLUMES IN A TRACK OF A RECORD CARRIER, AND A DEVICE FOR READING THE RECORD CARRIER THUS OBTAINED

摘要

A record carrier (21;70) is disclosed on which an information volume (VOL1) is recorded in sectors of a track (10) of the record carrier. The positions of the sectors in the track are denoted by a logic sector number LSN. The information volume (VOL1) comprises control information (PT;DF) intended to be used for controlling the search for information in the recorded information volume (VOL1). This control information (PT;DF) is arranged according to a predetermined format. A reference (VD1) to this control information is accommodated in sectors (VD1) in a predetermined address range (LSN=16 to LSN=SZ). Contiguous to the first information volume (VOL1) at least a next information volume (VOL2) is recorded in the track (10). Each next information volume (VOL2) comprises substitute reference information intended to be used for controlling the search for information both in the relevant information volume (VOL2) and in previously recorded information volumes (VOL1). The substitute reference information is accommodated in sectors (VD2) in a recoverable substitute address range (LSN=offs+16 to LSN=offs+SZ). The substitute address range is preferably equal to the corresponding address range in the first recorded information volume. In the reading apparatus (Fig. 8) a request for access to sectors in the address range (VD1) in the first information volume (VOL1) is transformed into a request for access to sectors (VD2) in the substitute address range of the last-recorded information volume (VOL2). Furthermore, a method and apparatus for recording information in afore-described format is disclosed.