Patent ID: 8004783
Filing Date: 2011-08-23
Classification: G11B

Abstract:
1. A method for testing a magnetic recording medium, the method comprising: a positioning step in which, while synchronously and coaxially rotating a disc shaped master medium where servo information is recorded and a disc shaped testing subject medium, a first magnetic head that reads the servo information from the master medium and a second magnetic head that carries out a magnetic recording/reproducing process of the testing subject medium are first moved synchronously with respect to the surfaces of the master medium and the testing subject medium, and then the second magnetic head is positioned in an inspected region of the testing subject medium based on servo information signals obtained by making the first magnetic head to read the servo information from the master medium; a signal generating step in which a magnetic recording/reproducing signal is generated by making the second magnetic head to conduct a magnetic recording/reproducing process of the inspected region; and a signal processing step in which the magnetic recording/reproducing signal obtained in the signal generating step is inspected, wherein the master medium includes a servo information region where the servo information is recorded radially from the center in a continuous manner, the inspected region corresponds to regions in the master medium including 2 or more data information regions adjacent to each other in the same track position via the servo information region, and a position of one of the inspected regions in the radial direction is arranged at a different position from that of another of the adjacent inspected regions arranged at a different track position.