Patent ID: 7916603

Claim:
A method for recording user information, comprising: providing a phase-change optical information recording medium having information recorded thereon representing (1) a first preset value of at least one of “m”th heating pulse THm and “m”th cooling pulse TCm, for setting an optimum write power during test recording and (2) a second preset value of at least one of “m”th heating pulse THm and “m”th cooling pulse TCm for recording said user information, said second preset value being different than said first preset value; and recording a mark of n×Tw time length on said phase-change optical information recording medium by irradiating “m” number of heating pulses with power Pw and “m” number of cooling pulses with power Pc, and wherein “m” is a natural number, “n” is a natural number, Tw is a channel bit length and Pw is larger than Pc, and wherein n=2m+1 is true when “n” is an odd number, n=2m is true when “n” is an even number, “i” is a natural number equal to or less than “m”, THi is a length of “i”th heating pulse and TCi is a length of “i”th cooling pulse.