Inspection device or inspection method for magnetic head or magnetic disc, and magnetic disc recording device and magnetic disc recording method

A magnetic head or magnetic disc inspection method for measuring a property of a magnetic head or magnetic disc, the method comprising the steps of:

• rotating the magnetic disc;
• writing a servo pattern into a servo pattern region of the magnetic disc, by a write-in element of the magnetic head;
• and
• reading-in the servo pattern written in the servo pattern region of the magnetic disc, by a read-in element of the magnetic head;
• servo-following a position of the magnetic head on the magnetic disc, on the basis of the servo pattern;
• wherein
• the servo pattern comprises a plurality of patterns, and the method includes the steps of writing-in the patterns with a first frequency for causing the patterns to be subjected to the servo following and, thereafter, overwriting the patterns with a second frequency different from the first frequency, except a servo following width used in the servo following.

A magnetic disc recording method comprising the steps of:

• rotating a magnetic disc;
• writing a servo pattern into a servo pattern region of the magnetic disc and writing a data into a data region of the magnetic disc, by a write-in element of a magnetic head;
• reading-in the servo pattern written in the servo pattern region of the magnetic disc, by a read-in element of the magnetic head;
• servo-following a position of the magnetic head on the magnetic disc based on the servo pattern;
• and
• reading-in the data, wherein
• the servo pattern comprises a plurality of patterns, and the method includes the steps of writing-in the patterns and the data with a first frequency for causing them to be subjected to the servo following and, thereafter, overwriting a portion, written-in with the first frequency, on the patterns and the data with a second frequency different from the first frequency, except a servo following width used in the servo following.