Patent ID: 8035908
Filing Date: 2011-10-11
Classification: B82Y,G11B

Abstract:
1. A method of forming a servo track on a recording medium of a data storage apparatus, the method comprising: forming a magnetic layer on a first side of the recording medium; defining a first servo track region having a plurality of first magnetic segments and a second servo track region having a plurality of second magnetic segments in the magnetic layer; applying a first magnetic field to the recording medium to induce a first magnetization direction in the plurality of first magnetic segments and the plurality of second magnetic segments; forming first magnetic patterns, each having a first width, and second magnetic patterns, each having a second width different from the first width, on a first side of a substrate; disposing the first side of the substrate on the first side of the recording medium, such that the first magnetic patterns are aligned in correspondence with the plurality of first magnetic segments and the second magnetic patterns are aligned in correspondence with the plurality of second magnetic segments; applying a second magnetic field to the recording medium to selectively induce a second magnetization direction into first selected ones of the plurality of first magnetic segments and second selected ones of the plurality of second magnetic segments.