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Abstract

A test data is written in an arbitrary point p on a non-linear characteristics portion of a hysteresis characteristics of a piezo actuator by a write head and the written test data is read out by an MR head using the point p as a reference to detect a maximum read-out voltage to thereby obtain a drive voltage of the piezo actuator corresponding thereto. From the drive voltage of the piezo actuator thus obtained, a position of the MR head whose offset is to be corrected is detected. In a magnetic disk certifier, the position of the MR head is corrected by applying the drive voltage corresponding to the maximum read-out voltage to the piezo actuator and the written test data is read out thereby. Thus, the position of the MR head on the piezo actuator becomes that of the write head when the offset correction value is detected and it becomes possible to correct the offset of the MR head with respect to the write head.

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First Claim