Optical disk and optical disk drive device

Abstract

An optical disk physical has a recording region divided into zones, each zone including physical tracks adjacent to each other. An integer number of sectors, are provided in each physical track. The angular recording density is higher in the more outward zones such that the linear recording density is substantially constant throughout the recording region, and logical tracks are formed of a predetermined number of sectors. independent of the physical tracks. The conversion between the logical track and sector addresses read from the disk and the linear logical addresses supplied from a host device is easy. The addresses written in headers of the sectors in the logical track in which data are actually recorded, including substitute sectors used in place of defect sectors, are preferably consecutive to further facilitate the conversion between the logical track and sector addresses read from the disk and the linear logical addresses supplied from the host device. Each of the zones can be set to serve as any of the different types of recording area, independently of other zones.

1 . An optical disk having physical tracks for recording data stored in a plurality of sectors;
 a user data region for recording user data and formed of said physical tracks;   a test region provided outside of said user data region, and formed of said physical tracks in which test data for adjustment of laser power used for writing is recorded;   guard tracks which are provided on the inner periphery side or the outer periphery side of said test region, and in which recording is not made;   wherein said guard tracks are provided outside of said data recording region, and are given addresses outside of the data tracks, and are allocated in logical track units;   each of said plurality of sectors are given sequential addresses using binary numbers;   said physical tracks have logical tracks as units for access operation, formed of 2 n  sectors (n being an integer greater than “1”);   the sector addresses of 2 n  sectors forming the logical track are given as sequential numbers represented by n-digit binary numbers;   a predetermined number of bits from a beginning of the address of each sector represent the track address of the logical track to which the sector belongs;   a predetermined number of bits from an end of the address of each sector represent the sector address of the sector within the logical track;   the address information of the logical track formed of 2 n  sectors are held at a plurality of locations in the physical tracks; and   identification numbers indicating the order are given to the same address information in the logical track held at a plurality of locations in the physical tracks, and are held in said physical tracks together with the address information.   
     
     
         2 . An optical disk drive device for accessing the optical disk as set forth in  claim 1 , comprising:
 a designating means for designating a sector address of a target sector to be accessed;   an address calculating means for calculating a track address of the logical track to which the target sector belongs, from the sector address designated by the designating means;   a detecting means for detecting a present position of a head based on the address information of the logical track held at a plurality of locations in said physical tracks, and said identification information; and   an accessing means for accessing the logical track to which the target sector belongs, based on the track address calculated by said address calculating means, and the present position of the head detected by said detecting means.   
     
     
         3 . The optical disk drive device as set forth in  claim 2 , further comprising:
 a calculating means for calculating the number of physical tracks to the logical track to which the target sector belongs, based on the track address calculated by said address calculating means, and the present position of the head detected by said detecting means;   wherein the physical position of the logical track to which the target sector belongs is calculated using the number of physical tracks having been calculated, and the access to the logical track is made.   
     
     
         4 . An optical disk device for accessing the optical disk as set forth in  claim 1 , comprising:
 a setting means for setting an optimum value of the laser power by recording test data on the test tracks, using an initial value of the laser power for writing, reading the recorded test data, and evaluating the reproduction quality based on the read data;   a designating means for designating a sector address of a target sector to be accessed;   an address calculating means for calculating a track address of the logical track to which the target sector belongs, from the sector address designated by the designating means;   a detecting means for detecting a present position of a head based on the address information of the logical track held at a plurality of locations in said physical tracks, and said identification information; and   an accessing means for accessing the logical track to which the target sector belongs, based on the track address calculated by said address calculating means, and the present position of the head detected by said detecting means.   
     
     
         5 . The optical disk drive device as set forth in  claim 4 , further comprising:
 a calculating means for calculating the number of physical tracks to the logical tracks to which the target sector belongs, based on the track address calculated by said address calculating means, and the present position of the head detected by said detecting means;   wherein the access to the logical track to which the target sector belongs is made using the number of physical tracks having been calculated.   
     
     
         6 . An optical disk drive method for accessing the optical disk as set forth in  claim 1 , comprising:
 designating a sector address of a target sector to be accessed;   calculating a track address of the logical track to which the target sector belongs, from the designated sector address;   detecting a present position of a head based on the address information of the logical track held at a plurality of locations in said physical tracks, and said identification information; and   accessing the logical track to which the target sector belongs, based on the track address of the logical track to which the target sector belongs, and the detected present position of the head.   
     
     
         7 . The optical disk drive method as set forth in  claim 6 , further comprising:
 calculating the number of physical tracks to the logical track to which the target sector belongs, based on the track address of the logical track to which the target sector belongs, and the detected present position of the head;   wherein the physical position of the logical track to which the target sector belongs is calculated using the calculated number of physical tracks, and the access to the logical track is made.   
     
     
         8 . An optical disk method for accessing the optical disk as set forth in  claim 1 , comprising:
 setting an optimum value of the laser power by recording test data on the test tracks, using an initial value of the laser power for writing, reading the recorded test data, and evaluating the reproduction quality based on the read data;   designating a sector address of a target sector to be accessed;   calculating a track address of the logical track to which the target sector belongs, from the designated sector address;   detecting a present position of a head based on the address information of the logical track held at a plurality of locations in said physical tracks, and said identification information; and   accessing the logical track to which the target sector belongs, based on the track address of the logical track to which the target sector belongs, and the detected present position of the head.   
     
     
         9 . The optical disk drive method as set forth in  claim 8 , further comprising:
 calculating the number of physical tracks to the logical tracks to which the target sector belongs, based on the track address of the logical track to which the target sector belongs, and the detected present position of the head;   wherein the access to the logical track to which the target sector belongs is made using the number of physical tracks having been calculated.