Data recording/reproducing method, data reproducing apparatus and recording medium

A data recording method comprising the steps of:

• with respect to a rewritable first recording medium:
• generating a first error-correcting code for a series of respective data of predetermined amount;
• generating a second error-correcting code for said series of respective data of said predetermined amount;
• generating data of respective recording units by adding said first error-correcting code to relating data of said predetermined amount and by adding said second error-correcting code to data of said predetermined amount other than said relating data of said predetermined amount;
• and
• recording data of said respective recording units on a recording medium;
• and with respect to a second recording medium that cannot be rewritten:
• generating said first error-correcting code for a series of respective data of said predetermined amount;
• generating said second error-correcting code for said series of respective data of said predetermined amount;
• generating data of respective recording units by adding said first error-correcting code and said second error-correcting code to relating data of said predetermined amount;
• and
• recording data of said respective recording units.

A data reproducing method comprising the steps of:

• (a) reproducing data of the certain recording unit from a recording medium with data of respective recording units recorded therein, said data of respective recording units generated by adding a first error-correcting code generated with respect to a series of data of a predetermined amount to said data of said predetermined amount and by adding a second error-correcting code generated with respect to a series of data of said predetermined amount to data other than said data of said predetermined amount;
• (b) detecting on the basis of said first error-correcting code contained in reproduced data of said certain recording unit whether or not data can be error-detected and error-corrected;
• (c) error-detecting and error-correcting said data if said data can be error-detected and error-corrected;
• (d) generating lost information on the basis of said second error-correcting code corresponding to said data of said certain recording unit when said data cannot be error-detected and error-corrected, said second error-correcting code concerning said data of a certain recording unit reproduced from said recording units;
• and
• (e) erasing and correcting said data of said certain recording unit by use of said erasure information and said first error-correcting code.

A data reproducing apparatus comprising:

• reproducing means for reproducing data at a recording unit from a recording medium with data of respective recording units recorded thereon, each said data of respective recording units being generated by adding a first error-correcting code generated with respect to a series of data of a predetermined amount to data of said predetermined amount from which said first error-correcting code is generated and by adding second error-correcting code generated with respect to said series of said data of said predetermined amount to data of said predetermined amount other than said data of said predetermined amount from which said second error-correcting code is generated;
• and
• error-correcting means for detecting on the basis of said first error-correcting code contained in reproduced data of a certain recording unit whether or not errors can be detected and corrected, detecting and correcting said errors if said errors can be detected and corrected, generating erasure information on the basis of said second error-correcting code corresponding to said data of said certain recording unit reproduced from a recording unit which contains said second error-correcting code corresponding to said data of said certain recording unit if said errors cannot be detected and corrected, and erasing and correcting said data of said certain recording unit by use of said erasure information and said first error-correcting code.

A data reproducing apparatus comprising:

• identifying means for identifying a first recording medium with data of respective recording units recorded thereon, said data of respective recording units being generated by adding a first error-correcting code generated with respect to a series of data of a predetermined amount to data of said predetermined amount from which said first error-correcting code is generated and by adding a second error-correcting code generated with respect to the series of data of a predetermined amount to data of said predetermined amount other than said data of said predetermined amount from which said second error-correcting code is generated, and a second recording medium with data of respective recording units recorded thereon, said data of respective recording units of said second recording medium being generated by a first error-correcting code generated with respect to a series of data of a predetermined amount and by adding a second error-correcting code generated with respect to the series of data of said predetermined amount to data of said predetermined amount from which said second error-correcting code is generated;
• reproducing means for reproducing data from said first and second recording mediums at said recording unit;
• and
• error-correcting means for detecting on the basis of said first error-correcting code contained in reproduced data of a certain recording unit whether or not errors can be detected and corrected, detecting and correcting said errors if said errors can be detected and corrected, generating erasure information on the basis of said second error-correcting code corresponding to said data of said certain recording unit reproduced from the recording unit which contains said second error-correcting code corresponding to said data of said certain recording unit, and erasing and correcting said data of said certain recording unit by use of said erasure information and said first error-correcting code if said errors cannot be detected and corrected when said identifying means identifies a recording medium as said first recording medium, and for detecting on the basis of said first error-correcting code contained in reproduced data of recording unit whether or not errors can be detected and corrected, detecting and correcting said errors if said errors can be detected and corrected, generating erasure information on the basis of said second error-correcting code contained in said data of said certain recording unit if said errors cannot be detected and corrected and erasing and correcting said data of said certain recording unit by use of said erasure information and said first error-correcting code if said identifying means identifies a recording medium as said second recording medium.