Patent ID: 7036209

Claim:
A method of simultaneously forming magnetic transition patterns in both side surfaces of a dual-sided recording medium by means of contact printing, comprising steps of: (a) providing a dual-sided recording medium having first and second opposing side surfaces; (b) providing a first magnetic stamper/imprinter having a first topographically patterned imprinting surface comprising a plurality of projections and depressions arranged in a first pattern corresponding to a first magnetic transition pattern to be formed in said first side surface of said medium; (c) providing a second magnetic stamper/imprinter having a second topographically patterned imprinting surface comprising a plurality of projections and depressions arranged in a second pattern corresponding to a second magnetic transition pattern to be formed in said second side surface of said medium, said second magnetic/stamper being formed from said first magnetic stamper/imprinter in a “mother”/“son” relationship; (d) contacting said first side surface of said medium with said first topographically patterned imprinting surface of said first magnetic stamper/imprinter; (e) contacting said second side surface of said medium with said second topographically patterned imprinting surface of said second magnetic stamper/imprinter; and (f) simultaneously forming magnetic transition patterns in both side surfaces of said medium by contact printing.