Patent ID: 7817367
Filing Date: 2010-10-19
Classification: G11B

Abstract:
1. A magnetic recording/reproducing apparatus, comprising a perpendicular magnetic recording double-layer medium with a soft magnetic underlayer and a reproducing head constituted by a magneto resistive effect type head with a shield film, wherein a reproduced signal outputted from said reproducing head is processed through a partial response equalization circuit having a frequency characteristic so that a low-frequency component of said reproduced signal including a direct current component is partially suppressed but not completely cut off through said partial response equalization circuit, wherein said reproduced signal outputted from said partial response equalization circuit is supplied to a maximum-likelihood decoder so as to be data-reproduced, wherein reproduced waveforms responding to a pair of the two closest recording transitions recorded on said recording medium at a shortest bit length interval are outputted as a waveform having intersymbol interference with intersymbol interference values A wherein said outputted waveforms are supplied to said maximum-likelihood decoder so as to be data-reproduced.