Patent ID: 7457216

Claim:
A method for recording and reproducing a recordable DVD medium, the method comprising data recording of the recordable DVD medium by a plurality of marks having varying lengths, wherein data recording comprises: starting recording of the recordable DVD medium under the condition of a CLV linear velocity other than a highest linear velocity at an innermost circumference, wherein the recordable DVD medium comprises a recording layer containing an organic dye and a disc-form substrate having a guide groove provided with wobble, wherein a recording condition for a CLV highest linear velocity and a recording condition for a CLV linear velocity other than the highest linear velocity are coded and recorded in advance at a given position of the substrate; performing test-writing in a power calibration area at an outermost circumference so as to obtain an optimum recording power of Po at the highest linear velocity when switchover to recording with the highest linear velocity is performed at a radial position where rotation at the highest linear velocity becomes attainable; and restarting recording of the recordable DVD medium under the condition of the highest linear velocity and a recording power set by a result of comparison which is made between the optimum recording power of Po at the highest linear velocity that is temporarily optimized by the test-writing and an optimum recording power of Pi at the highest linear velocity that is coded and recorded in advance in the substrate; in the case of Po>Pi, a recording power given by the formula of (Po+Pi)/2+(Po−Pi) 2 /Pi is employed as a recording power with which recording starts at the highest recording velocity, and in the case of Po≦Pi, Pi is employed as a recording power with which recording starts at the highest linear velocity.