Patent ID: 6407544
Filing Date: 2002-06-18
Classification: G11B

Abstract:
A method for testing a plurality of magnetic head devices wherein each magnetic head device has a supporting member and a magnetic head having a recording function portion and a read function portion at an end of the supporting member, the method comprising the steps of:placing the plurality of magnetic head devices on different scanning regions of a disk-shaped recording medium in the radial direction, each scanning region being slightly displaced from the other scanning regions in the radial direction of the recording medium, wherein said displacement is within about 1% of a reference radius set in the radial middle of said plurality of scanning regions; turning said disk-shaped recording medium; recording a plurality of magnetic signals on a common surface of said recording medium; and reading the recorded magnetic signal through each of said plurality of magnetic head devices in order to evaluate each of said plurality of magnetic head devices simultaneously through said read signal.