Method of demagnetizing and transferring magnetization in a magnetic recording medium, and device thereof

A control device for magnetic recording comprising:

• a demagnetization means;
• and
• a transfer means;
• wherein said demagnetization means applies an alternating magnetic field perpendicular to or perpendicular and parallel to the recording surface of the magnetic recording layer of a magnetic recording medium, the intensity of said alternating magnetic field decreasing with elapse of time, to initially demagnetize a magnetic recording layer, and
• wherein said magnetic transfer means positions a master disc in close contact with or in close proximity to said recording surface of said magnetic recording layer, said master disc comprising a nonmagnetic substrate and a plurality of soft magnetic layers of a soft magnetic material embedded in said nonmagnetic substrate such that said soft magnetic layers are isolated from each other and aligned periodically;
• and
• wherein said magnetic transfer means applies a magnetic field in parallel to said recording surface of said magnetic recording layer, to magnetically transfer the servo data stored in said master disc in the form of said soft magnetic patterns to said magnetic recording medium initially demagnetized by said demagnetization means.