Method of manufacturing master disks for magnetic transferring, system of controlling content concentrations in electroforming bath, and magnetic recording medium

A system of controlling electroforming bath content concentrations, comprising:

• an electroforming tank,
• an adjusting tank for supplying an electroforming liquid to the electroforming tank and collecting electroforming liquid overflowing the electroforming tank,
• a concentration adjuster feeding device for feeding the adjusting tank with concentration adjusters for adjusting content concentrations in the electroforming liquid,
• a capillary electrophoretic device for measuring content concentrations in the electroforming liquid in the adjusting tank, and
• a controller,
• wherein the electroforming liquid in the adjusting tank is automatically sampled at prescribed intervals of time, the content concentrations in the sampled electroforming liquid are quantitatively analyzed with the capillary electrophoretic device, the controller automatically determines the doses of the concentration adjusters to be fed on the basis of the analytical results, bath adjustment is performed by automatically feeding the adjusting tank with the concentration adjusters in the determined doses from the concentration adjuster feeding device, and control is thereby achieved to maintain the content concentrations in the electroforming liquid within a prescribed range.