Testing apparatus for magnetic recording medium and testing method for magnetic recording medium

A testing apparatus for magnetic recording medium, comprising:

• a rotary mechanism which causes synchronous, coaxial rotation of a discoid master medium that records servo information and a discoid subject medium;
• a first support arm to the tip of which is attached a first magnetic head that reads said servo information from said master medium;
• a second support arm to the tip of which is attached a second magnetic head that conducts playback of the magnetic recording of said subject medium;
• a head stack assembly which causes synchronous movement of said first magnetic head and said second magnetic head by causing synchronous, coaxial rotation of said first support arm and said second support arm, 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;
• and a signal processing mechanism which synchronizes said servo information signals and magnetic recording playback signals that are generated by having said second magnetic head conduct magnetic recording playback of recording regions of said subject medium corresponding to said servo information signals, and which tests magnetic recording playback signals of said subject medium.