Patent ID: 8643966

Claim:
A magnetic head inspection device or magnetic disc inspection device for measuring a property of a magnetic head or magnetic disc, the inspection device comprising: a write-in signal generation section configured to write a servo pattern into a servo pattern region of the magnetic disc, and configured to write data into a data region of the magnetic disc, by a write-in element of the magnetic head; a servo control section provided with: a servo pattern detection section configured to read-in the servo pattern written in the servo pattern region of the magnetic disc, by a read-in element of the magnetic disc, and a head detection/positioning section configured to carry out servo-following of a position of the magnetic head on the magnetic disc, on the basis of output of the servo pattern detection section; and a total control section configured to control the entire write-in signal generation section and servo control section; wherein the servo pattern comprises a plurality of patterns, and the write-in signal generation section is configured to write-in the patterns with a first frequency for causing the patterns to be subjected to the servo-following, and is configured to overwrite the patterns with a second frequency different from the first frequency, except a servo-following width which is used in the servo-following; and wherein the servo-following width is wider than the read-in element width, and is not more than 120% of the read-in element width.