Method for optimizing the read bias current of a magneto resistive head

摘要

A method for setting a read bias current required for reading data written to a hard disk at an optimal bias current using a magneto-resistive (MR) head. The method for setting a read bias current includes the steps of: writing data to the hard disk in a predetermined frequency; reading data from the disk while varying a bias current value applied to the MR head; analyzing frequency characteristics of the read data; and selecting the bias current at which the read data has the best frequency characteristics, as the bias current of the MR head. In the method, the optimal read bias current is set within a short time through a fast Fourier transform (FFT), thereby reducing the processing time.