Optical data recording media and method for recording and erasing data on the same

In an optical data recording media provided with a recording layer which changes its optical characteristics by the difference of heat history of heating and cooling by the irradiation of the laser light to a transparent substrate on which tracking channels have been formed, the width of extruded or concave region formed by the tracking channels on the substrate is narrower than the diameter of the laser beam being used for recording, erasing and reading. Thereby, problem which is associated with the recording frequency-dependent erasing efficiency in case the pulse width modulation method is used as the modulation method, can be dissolved.