Method of manufacturing stamper

Abstract

According to one embodiment, a method of manufacturing a stamper used for manufacturing a magnetic recording medium having magnetic patterns corresponding to servo areas including a preamble section, an address section and a burst section and data areas including discrete tracks, the method includes forming additional resist patterns such that protrusions and recesses appear alternately in the radial direction in the preamble section and/or address section, in forming resist patterns corresponding to the servo areas including the preamble section, the address section and the burst section and data areas including discrete tracks are formed on a master plate, depositing a conductive film on the entire surface of the master plate and resist patterns, followed by electroforming a metal layer, and peeling off the metal layer from the master plate.

1 . A method of manufacturing a stamper used for manufacturing a magnetic recording medium comprising a magnetic pattern corresponding to servo areas comprising a preamble section, an address section and a burst section and data areas comprising discrete tracks, the method comprising:
 forming an additional resist pattern comprising alternating protrusions and recesses in the radial direction in the preamble section and/or address section, in the forming resist pattern corresponding to the servo areas comprising the preamble section, the address section and the burst section, and data areas comprising discrete tracks on a master plate;   depositing a conductive film on the entire surface of the master plate and resist patterns;   electroforming a metal layer; and   peeling off the metal layer from the master plate.   
     
     
         2 . A method of  claim 1 , wherein the additional resist pattern comprises a redundant bit string comprising alternating “1” and “0” bits in the radial direction. 
     
     
         3 . A method of  claim 1 , wherein the additional resist pattern is used as an error correcting code. 
     
     
         4 . A method of  claim 3 , wherein the resist pattern corresponding to the error correcting code comprises a Hamming code. 
     
     
         5 . A method of  claim 1 , further comprising forming the resist pattern of the preamble section comprising the resist pattern divided by recesses in the radial direction. 
     
     
         6 . A method of  claim 1 , further comprising:
 forming the resist pattern in the circumferential direction separated from each other in the radial direction in a region of the master plate positioned on the outside of the outer periphery of the magnetic recording medium, the resist pattern comprising shapes similar to shapes of the discrete tracks.   
     
     
         7 . A method of  claim 6 , further comprising:
 removing a region of the metal layer peeled off from the master plate on the outside of the outer periphery of the magnetic recording medium after electroforming.