Optical disk drive recording/reproduction apparatus and method for producing modified address data

An optical disk drive apparatus for recording data on and reproducing data from an optical disk using both of concentric or spiral data recording tracks formed of grooves, and lands between the grooves, with a track corresponding to a revolution of the disk being formed of an integer number of sectors, the sectors each having address data area shifted in the radial direction of the disk so that when one of the sectors in one of the tracks is scanned, the address data area of said one of the sectors, and the address data area of another sector adjacent to said one of the sectors are both scanned,

• said apparatus comprising:
• a reproducing section for reading, when a first sector in a first track is scanned, a data from said address data area of said first sector in said first track to produce a first direct address data, and a data from said address data area of a second sector in a second track adjacent to said first track, to produce a second direct address data;
• a modifying circuit for modifying the second direct address data with an inter-track address difference, to produce a first modified address data of said first sector;
• said inter-track address difference representing the difference between the address values of said first sector and said second sector;
• and
• a determination circuit using said first direct address data and said first modified address data to determine a correct address value of said first sector.