Data recording method, data recording apparatus, data reproduction method and data reproduction apparatus

A data recording method of scrambling input data based on Maximum-length sequences that are generated by n-degree primitive polynomials, comprising:

• a selecting process for selecting a specific Maximum-length sequences is selected, based on recording position data, from among Maximum-length sequences that are generated by a plurality of primitive polynomials of said n-degree primitive polynomials whose k number (k<n) of coefficients all become zero in order starting from the coefficient of the largest degree;
• and
• a scrambling process for scrambling input data according to the Maximum-length sequences to generate recording data.

A data recording method of scrambling input data based on Maximum-length sequences that are generated by n-degree primitive polynomials, comprising:

• a selecting process for selecting a specific Maximum-length sequences is selected, based on recording position data, from among a specified number of said Maximum-length sequences that are generated by two arbitrary primitive polynomials of said n-degree primitive polynomials and from which combinations having large correlation between pairs of Maximum-length sequences have been excluded;
• and
• a scrambling process for scrambling input data according to the Maximum-length sequences to generate recording data.

A data recording apparatus for scrambling input data based on Maximum-length sequences that are generated by n-degree primitive polynomials, said apparatus comprising:

• a selecting device which selects a specific Maximum-length sequences based on recording position data from among Maximum-length sequences that are generated by a plurality of primitive polynomials of said n-degree primitive polynomials having m number (m<n) of non-zero coefficients;
• and
• a scrambling device which scrambles input data according to the Maximum-length sequences to generate recording data.

A data recording apparatus for scrambling input data based on Maximum-length sequences that are generated by n-degree primitive polynomials, said apparatus comprising;

• a selecting device which selects a specific Maximum-length sequences based on recording position data from among Maximum-length sequences that are generated by a plurality of primitive polynomials of said n-degree primitive polynomials whose k number (k<n) of coefficients all become zero in order starting from the coefficient of the largest degree;
• and
• a scrambling device which scrambles input data according to the Maximum-length sequences to generate recording data.

A data recording apparatus for scrambling input data based on Maximum-length sequences that are generated by n-degree primitive polynomials, said apparatus comprising:

• a selecting device for selecting a specific Maximum-length sequences based on recording position data from among a specified number of said Maximum-length sequences that are generated by two arbitrary primitive polynomials of said n-degree primitive polynomials and from which combinations having large correlation between pairs of Maximum-length sequences have been excluded;
• and
• a scrambling device which scrambles input data according to the Maximum-length sequences to generate recording data.