PEMBAWA INFORMASI MASTER, METODA UNTUK MEMBUAT PEMBAWA TERSEBUT, METODA DAN ALAT UNTUK PENULISAN INFORMASI KE DALAM MEDIUM REKAM MAGNETIK DENGAN MENGGUNAKAN PEMBAWA

摘要

A master information carrier comprises a substrate whose surface has an embossed pattern corresponding to an information signal. At least a surface of the protruding portion of the embossed pattern is made of a ferromagnetic material. A method for writing an information signal into a sheet or disk magnetic record medium with a ferromagnetic thin film or coating is performed by putting the surface of the magnetic record medium into contact with the master information carrier so as to write a magnetized pattern corresponding to the embossed pattern of the master information carrier into the magnetic record medium.