a method for manufacturing a thin - film magnetic head includes a step of cutting a wafer into bars , each bar having a plurality of thin - film magnetic head sliders which are sequentially coupled with each other , a step of identifying the bar to be worked to generate an identification signal which indicates identity of the bar , a step of obtaining data of the bar in a unit of bar depending upon the identification signal , and a step of processing at least one working of the bar on the basis of the obtained data of the bar .