Patent ID: 6785196
Filing Date: 2004-08-31
Classification: G11B

Abstract:
Device for recording at least one information block in track in a recordable area on a record carrier, which information block comprises data words and error correction words for correcting errors within the information block, and which track has preformed position information indicative of positions for recording the information blocks, which device comprises recording means (22) for recording marks representing the information blocks and control means (20) for recording and retrieving position data indicative of the position of the recorded information blocks, characterized in that the control means comprisemapping means (31) for determining in which region the information block is recorded, the region being one of a number of consecutive regions constituting the recordable area, and for recording a random signal unit in a unit location in a mapping area of the record carrier, the unit location in the mapping area being indicative of said region, and the unit length of the random signal unit being substantially smaller than the length of said information block, and detecting means (32) for retrieving from said mapping area if a region contains at least one information block by detecting the presence of the recorded random signal units.