Patent ID: 6366417
Filing Date: 2002-04-02
Classification: G11B

Abstract:
A magnetic data storage system, comprising:a magnetic medium for storing data in the form of magnetic polarity transitions; a magnetic head, said magnetic head being biased by a bias current, for sensing a magnetic field created by said magnetic polarity transitions and for converting said magnetic field to an analog read signal, said analog read signal including positive and negative pulses having amplitudes that are different from one another; detection means for converting said analog read signal into a digital data signal which represents the data originally stored on said magnetic medium; and read signal preconditioning means, located between said head and said detection means, including pulse amplitude asymmetry reduction means for making the amplitudes of the positive and negative pulses of said analog read signal substantially equivalent to one another before said analog read signal reaches said detection means and absent application of a DC bias to said analog read signal when making the amplitudes substantially equivalent to one another.