Patent ID: 7936529

Claim:
A testing method for magnetic recording medium, comprising: a positioning process which, while causing synchronous, coaxial rotation of a discoid master medium that records servo information and a discoid subject medium, causes synchronous movement of a first magnetic head that reads said servo information from said master medium and a second magnetic head that conducts playback of the magnetic recording of said subject medium relative to the surfaces of said master medium and said subject medium, and which determines the position of said second magnetic head relative to said subject medium based on servo information signals obtained by loading said servo information from said master medium into said first magnetic head; a signal generating process which generates magnetic recording playback signals by having said second magnetic head conduct magnetic recording playback of recording regions of said subject medium corresponding to said servo information signals; a signal processing process which synchronizes said servo information signals and said magnetic recording playback signals by said signal processing mechanism, and which tests magnetic recording playback signals of said subject medium, and replacing the subject medium for which testing has been completed with another subject medium to undergo certify testing, without removing the master medium from a certify testing apparatus, while moving the first magnetic head and the second magnetic head to a retraction area during replacement of the subject media.