Patent ID: 6525891
Filing Date: 2003-02-25
Classification: G11B

Abstract:
An apparatus for processing a data signal in a disk storage system having a magnetoresistive (MR) head, comprising:TA detecting means for detecting a thermal asperity (TA) from a change in level of a data signal read by the MR head and generating a detection signal representing the thermal asperity (TA); first compensation means for compensating a change in DC level of the data signal in accordance with the detection signal generated by said TA detecting means; and second compensation means for compensating a DC undershoot of the data signal in accordance with the detection signal generated by said TA detecting means, wherein said second compensation means is connected to an input of said first compensation means, has switching means which is closed by the detection signal generated by said TA detecting means and which maintains a DC level of the data signal at zero level while said TA detecting means is generating the detection signal, thereby to reduce DC undershoot contained in the data signal and resulted from TA disturbance present in the data signal, and supplies the data signal to said first compensation means.