Optical disk having a rewritable area and a read-only area

An optical disk having a rewritable first recording area and a read-only second recording area,

• wherein the first recording area includes first tracks composed of groove tracks consisting of grooves and land tracks consisting of spaces between adjacent grooves, the groove tracks and the land tracks being formed on an optical disk substrate alternately in a spiral or concentric shape, each of the first tracks being divided into a plurality of first sectors, each of the first sectors including a first header region having identification data for identifying the first sector and a first data region for recording user data as recording marks by changing optical characteristics of a recording layer,
• the second recording area includes second tracks formed with physical bit rows arranged on the optical disk substrate in a spiral or concentric shape, each of the second tracks being divided into a plurality of second sectors, each of the second sectors including a second header region having identification data for identifying the second sector and a second data region having read-only data recorded as the bit rows,
• a data series of the first recording area being modulated with a modulation code and a data series of the second recording area being modulated with the modulation code,
• the first sector having a sector data capacity and the second sector having the sector data capacity,
• the first header region having a header region data sequence and the second header region having the header region data sequence, and
• the first data region having a data region data sequence and a data region data capacity, and the second data region having the data region data sequence and the data region data capacity.

An optical disk having a rewritable first recording area and a read-only second recording area,

• wherein the first recording area includes first tracks composed of groove tracks consisting of grooves and land tracks consisting of spaces between adjacent grooves, the groove tracks and the land tracks being formed on an optical disk substrate alternately in a spiral or concentric shape, each of the first tracks being divided into a plurality of first sectors, each of the first sectors including a first header region having identification data for identifying the first sector and a first data region for recording user data by forming recording marks obtained by changing optical characteristics of a recording layer,
• the second recording area includes second tracks formed with physical bit rows arranged on the optical disk substrate in a spiral or concentric shape, each of the second tracks being divided into a plurality of second sectors, each of the second sectors including a second header region having identification data for identifying the second sector and a second data region having read-only data recorded as the bit rows,
• at least one of the first and second data regions comprises:
• a first data synchronous series provided at a head of the at least one of the first and second data regions for specifying a start timing position of the at least one of the first and second data regions;
• a second data synchronous series preceding the first data synchronous series for specifying a start timing position of the at least one of the first and second data regions;
• and
• a third data synchronous series preceding the second data synchronous series and having a predefined repetition sequence pattern of a modulation code in the data region.