The present invention relates to a magnetic recording apparatus, and more particularly to the compensation of a phase shift of a reproduced pattern in a magnetic recording apparatus having one or more magnetic heads.
It is known that magnetic recording apparatus such as magnetic disk apparatus and magnetic tape apparatus suffer from the problem of a pattern peak shift in which the position of reverse magnetization of digital data recorded on a magnetic recording medium is shifted in the direction which the interval of reverse magnetization is made longer.
The pattern peak shift is greatly dependent on a data pattern written in the magnetic recording media. To cope with this, there has been known a so-called write compensation method for effecting timing correction at the time of writing data having a large peak shift on a magnetic recording medium.
However, the conventional write compensation method is not effective in completely eliminating pattern peak shifts. As the recording density of recent magnetic recording apparatus becomes higher and higher, the width of a separate window of data tends to be smaller. Therefore, the peak shift causes a reduction in a positional margin.