Magnetic disk reproduction with offset compensation for thermal asperity

摘要

A magnetic disk reproducing apparatus for reproducing data recorded at an arbitrary position on a rotating disk by a head includes a level detecting unit for detecting a level of a DC component of a reproduced signal outputted from the head; a delaying unit for delaying the reproduced signal by a predetermined value; and a correcting unit for correcting the level of the DC component of the reproduced signal outputted from the delaying unit when the level of the DC component detected by the level detecting unit becomes larger than a predetermined threshold level. Preferably, a control method of a magnetic disk reproducing apparatus having such a construction includes the steps of detecting a level of a DC component of a reproduced signal outputted from the head; delaying the reproduced signal by a predetermined value; and correcting the level of the DC component of the delayed reproduced signal when the level of the DC component so detected becomes larger than a predetermined threshold level.