| 摘要 |
In the case that perpendicular magnetic recording is used, when a cut-off frequency fc of a high-pass filter of a head output is small, an error rate can be improved more when a PR target having a DC component is used and, when the cut-off frequency fc is large, an error rate can be improved more when a PR target not having a DC component is used. With this fact as a logical ground, in the present invention, when TA does not occur, PR equalization is performed using the PR target having a DC component and, when TA occurs, the cut-off frequency fc is increased to cut a low frequency component of a head reproduction signal and, additionally, PR equalization is performed using the PR target not having a DC component.
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