High speed recording and reproducing method and apparatus of data recorded on disc

Abstract

A header in which an address signal has been recorded is provided on the disc every predetermined sector interval. Recording data is arranged in an error correction encoding block and the error correcting process is performed. The error correction encoding block is divided into a plurality of portions in a predetermined direction, thereby forming sectors S 1, S 2, S 3, . . . . The data of each sector is recorded subsequent to the header. Upon reproduction, the header is detected and the data is reproduced every sector. One of the error correcting processes is performed in the reproduced data in the sectors S 1, S 2, S 3, . . . . In the case where errors cannot be corrected by the error correcting process in the reproduced data in the sector, the error correction block including the sectors S 1, S 2, S 3, . . . is reproduced and the error correcting processes are performed in the sequences in two directions.

What is claimed is:  
     
         1 . A method of recording data to a disc on a sector unit basis in which address information has been recorded every sector on said disc, comprising the steps of: 
 arranging inputted data every block composed of a plurality of sectors;    error correction encoding the data in said block so as to be completed in said block;    forming a plurality of sectors by dividing said block including encode parity data into a plurality of portions in a predetermined direction; and    recording the data of each said sectors to said disc in correspondence to said address information.    
     
     
         2 . A method according to  claim 1 , wherein said step of error correction encoding includes a step of forming parity data for an error correction for data sequences in at least two directions of said block, and said step of forming said sectors includes a step of dividing said block in the same direction as that of at least one of said data sequences.  
     
     
         3 . A method according to  claim 1 , wherein said step of error correction encoding includes a step of forming parity data for an error correction for data sequences in two directions of the horizontal or vertical direction and the oblique direction of said block and said step of forming sectors includes a step of dividing said block in said horizontal or vertical direction.  
     
     
         4 . A method according to  claim 1 , wherein one of said plurality of sectors in said block is a parity sector comprising said parity data, and said method further includes the steps of: 
 in case of rewriting data in a desired sector, reproducing the sector data before rewriting from said disc;    forming parity data from only new sector data and the reproduced sector data; and    writing the formed parity data into said parity sector on said diis in order to rewrite said parity sector.    
     
     
         5 . A method according to  claim 1 , wherein said step of error correction encoding includes a step of forming parity data for an error correction for data sequences in two directions of the horizontal and vertical directions of said block, and said step of forming the sector includes a step of dividing said block in either one of said horizontal and vertical directions.  
     
     
         6 . A method according to  claim 1 , wherein one of said plurality of sectors is a parity sector comprising said parity data and said method further includes the steps of: 
 reproducing data in a desired sector from said disc;    forming parity data from only new sector data and the reproduced sector data; and    writing a formed error correction code into said parity sector on said disc in order to rewrite said parity sector.    
     
     
         7 . A method of reproducing data from a disc in which address information has been recorded every sector and said data has been recorded on a sector unit basis in correspondence to said address information, in which said sector is formed by dividing a block into a plurality of portions in a predetermined direction, comprising the steps of: 
 detecting said address information and also reproducing the data every sector on the basis of said address information;    performing an error correction for the reproduced data in said sector; and    in the case where errors of said reproduced data in said sector cannot be corrected, reproducing the data in said block including said sector and also performing the error correction for the data in said block.    
     
     
         8 . A method according to  claim 7 , wherein the data in said sector has first parity data which was encoded for a data sequence in the sector and the data in said block has second parity data which was encoded for a data sequence existing in a plurality of sectors in said block.  
     
     
         9 . A method according to  claim 8 , wherein said step of error correcting in said sector includes a step of performing an error correction by using said first parity data, and said step of performing the error correction in said block includes a step of executing an error correction by using said second parity data.  
     
     
         10 . A method according to  claim 7 , further including the step of extracting data of the sector to be reproduced from said block after the error correction was performed to the data in said block.  
     
     
         11 . An apparatus for reproducing data from a disc in which a header including address information has been recorded every sector and the data has been recorded on a sector unit basis in correspondence to said address information, in which said sector is formed by dividing a block into a plurality of portions in a predetermined direction, comprising: 
 means for detecting said address information and for reproducing the data every sector on the basis of the address information;    error correcting means for performing an error correction for the reproduced data in said sector; and    control means for controlling said reproducing means in a manner such that when errors of the data in said sector cannot be corrected, all of the data in said block including said sector is reproduced and for controlling said error correcting means so as to perform the error correction for the reproduced data in said block.    
     
     
         12 . An apparatus according to  claim 11 , wherein the data in said sector has first parity data encoded for a data sequence which is completed in said sector and also has second parity data encoded for a data sequence existing in a plurality of sectors in said block, and said error correcting means performs the error correction for the data in said sector by using said first parity data and, when errors of the data in said sector cannot be corrected, said error correcting means further performs the error correction for the data in said block by using said second parity data.  
     
     
         13 . An apparatus according to  claim 12 , wherein said first parity data is the data encoded for the data sequence in the horizontal or vertical direction of said block and said second parity data is the data encoded for the data sequence in the oblique direction of said block.  
     
     
         14 . An apparatus according to  claim 12 , wherein one of the plurality of sectors in said block is a parity sector composed of said first and second parity data and, when errors of the data in said sector cannot be corrected, said reproducing means reproduces said parity sector and said error correcting means again performs the error correction for the data in said sector by using the reproduced parity data in said parity sector.  
     
     
         15 . An apparatus according to  claim 11 , further having block desegmenting means for extracting data in the sector to be reproduced in the sector from said block after the error correction was performed to the data in said block.  
     
     
         16 . An apparatus according to  claim 11 , wherein when the data to be reproduced is the data composed of a plurality of sectors, said control means controls said reproducing means so as to reproduce said block including those sectors.