Patent ID: 7057980
Filing Date: 2006-06-06
Classification: G11B

Abstract:
1. A device for recording at least one information block in a track in a recordable area on a record carrier, said information block comprising data words and error correction words for correcting errors within the information block, and said track having preformed position information indicative of positions for recording the information blocks, said device comprising: recording means for recording marks representing the information blocks; reading means for reading from the track on a record carrier and control means for causing said recording means to record and the reading means to retrieve position data indicative of the position of the recorded information blocks, characterized in that the control means further comprises: mapping means 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 causing said recording means to record 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 a unit length of the random signal unit being substantially smaller than a length of said information block; and detecting means for enabling retrieving from said mapping area if a region contains at least one information block by detecting the presence of the recorded random signal units.