Method for testng mold structure, mold structure, and magnetic recording medium

A mold structure, comprising:

• a disc-shaped base material;
• and
• a concavo-convex pattern for a servo area and a concavo-convex pattern for a data area formed on a surface of the base material according to a desired design pattern,
• wherein the concavo-convex pattern for the servo area are aligned in the radial direction of the base material, and the concavo-convex pattern for the data area are aligned in the circumferential direction between the concavo-convex patterns for the servo area, and
• wherein the mold structure is tested by a method for testing a mold structure, the method comprising:
• magnetically transferring a magnetic signal according to the concavo-convex pattern for the servo area in the mold structure to a perpendicular magnetic recording medium;
• electrically reproducing 50 tracks or more of the magnetic signal of servo data transferred onto the perpendicular magnetic recording medium using a magnetic head so as to obtain a reproduction signal;
• and
• calculating a pattern drawing accuracy in the radial direction from the reproduction signal so as to evaluate a performance of the mold structure.

A magnetic recording medium produced by using a mold structure tested by a method for testing a mold structure,

• wherein the mold structure comprises:
• a disc-shaped base material;
• and
• a concavo-convex pattern for a servo area and a concavo-convex pattern for a data area formed on a surface of the base material according to a desired design pattern, and
• wherein the concavo-convex pattern for the servo area are aligned in the radial direction of the base material, and the concavo-convex pattern for the data area are aligned in the circumferential direction between the concavo-convex patterns for the servo area, and
• wherein the method for testing a mold structure comprises:
• magnetically transferring a magnetic signal according to the concavo-convex pattern for the servo area in the mold structure to a perpendicular magnetic recording medium;
• electrically reproducing 50 tracks or more of the magnetic signal of servo data transferred onto the perpendicular magnetic recording medium using a magnetic head so as to obtain a reproduction signal;
• and
• calculating a pattern drawing accuracy in the radial direction from the reproduction signal so as to evaluate a performance of the mold structure.