Patent ID: 7965600

Claim:
A data recording evaluation method, comprising: (i) reproducing a result of data recording performed on an optical disk and detecting reproduction signals based on the reproduction; (ii) identifying a plurality of detection patterns based on the detected reproduction signals; (iii) measuring a value D(x) of the reproduction signal associated with each detection pattern P wherein x is a data profile number; (iv) calculating a first evaluation index value PRerror_ptn(p) using equation (1) based on the measured value D(x) and a reference value R(x) for each detection pattern P, PRerror_ptn ⁢ ( p ) = { ∑ x = a a + n - 1 ⁢ ( D ⁡ ( x ) - R ⁡ ( x ) ) 2 } / n ( 1 ) wherein a is a calculation starting data number, and n is the number of calculated data samples; (v) evaluating data recording conditions based on the first evaluation index value; (vi) calculating a second evaluation index value PRerror_ttl using equation (2) from the plurality of detection patterns, PRerror_ttl=Σ p PRerror_ptn(p)*Probability of Occurrence(p) (2) ; and (vii) identifying the detection patterns more affecting the second evaluation index value than do other detection patterns, wherein the more affecting detection patterns are selected as the plurality of detection patterns in step (ii), followed by steps (iii) to (v).