Patent ID: 7382561

Claim:
A magnetic recording device comprising: a read head for reading magnetic fluxes on a magnetic media, the read head having an output from which is transmitted a read data signal; an asymmetry compensator for at least reducing an affect of non-linear asymmetry in the read data signal, the asymmetry compensator having an input coupled to the output of the read head, the asymmetry compensator comprising a gamma amplifier whose compensation of the read data signal depends at least in part on an amplitude of a positive pulse in the read data signal and an amplitude of an undershoot relative to the positive pulse in the read data signal, and the asymmetry compensator having an output from which is transmitted a compensated data signal; a data decoder for reading encoded data from the compensated data signal, the data decoder having an input coupled to the output of the asymmetry compensator; and an analog-to-digital (A/D) converter for converting analog data to digital data; wherein the compensation of the read data signal by the gamma amplifier further depends at least in part on an amplitude of a negative pulse in the read data signal and an amplitude of an overshoot relative to the negative pulse in the read data signal; and wherein the compensation of the read data signal by the gamma amplifier further depends at least in part on the width of a wave form in a pulse in the read data signal.