Patent ID: 6335840
Filing Date: 2002-01-01
Classification: G11B

Abstract:
A method for controlling movement of an arm adjacent a magnetic recording medium in a direct access storage device (DASD) in response to a readback signal generated from a magnetoresistive (MR)transducer of the DASD arm, the method comprising the steps of(a) receiving multiple data samples of the readback signal as the MR transducer repeatedly passes above multiple servo fields and data fields of the recording medium; (b) detecting a thermal asperity in the readback signal when the MR transducer is above a servo field of the recording medium; (c) determining the location of the servo field data samples affected by the thermal asperity; and (d) altering processing in the servo channel in response to determining the location of the servo field data samples affected by the thermal asperity, before the MR transducer is next above the servo field of the recording medium.