Methods of forming and reading servo track and data storage apparatus

Abstract

A method of forming a servo track on a recording medium includes; forming a magnetic layer, defining a first servo track region having a plurality of first magnetic segments and a second servo track region having a second plurality of magnetic segments in the magnetic layer, applying a first magnetic field to induce a first magnetization direction in the first and second pluralities of 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 substrate on 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, and applying a second magnetic field to the recording medium to selectively induce a second magnetization direction into first selected ones of the first plurality of magnetic segments and second selected ones of the second plurality of magnetic segments.