Patent ID: 6657428
Filing Date: 2003-12-02
Classification: G11B

Abstract:
A method of restoring stability to a magneto resistive (MR) head of a disc drive, comprising the steps of:(a) determining whether a performance value of the MR head is less than a predetermined first bit error rate value by performing a bit error rate test based on read data errors so as to check the performance of the MR head; (b) applying a reset current pulse to the MR head in the event that the result obtained in the step (a) is less than the predetermined first bit error rate value, wherein a level of the current pulse is determined to be inversely proportional to a resistance value of the MR head; (c) performing the bit error rate test after the step (b) to check the performance of the MR head; and (d) checking whether the result obtained in the step (c) is less than a predetermined second bit error rate value and applying the reset current pulse to the MR head and returning back to the step (c) when the result of step (d) is less than the predetermined second bit error rate value or ending the process of restoring stability to the MR head when the result is not less than the predetermined second bit error rate value.