Patent ID: 8308964

Claim:
A method comprising: etching data trenches and servo trenches in a hard magnetic layer of a substrate; depositing a filler material layer over the magnetic material, the filler material layer filling the data trenches and the servo trenches, an upper surface of the filler material layer having data recesses over the data trenches and servo recesses over the servo trenches; planarizing the upper surface of the filler material to remove the data recesses and not completely remove the servo recesses; coating the filler material layer and filling the servo recesses with a resist material and curing the resist material; etching the substrate with an etch process that selectively etches the filler material at a faster rate than the resist material, the etching continuing until the upper surface of the filler material is substantially planar with the servo recesses; and removing the resist material remaining over the servo trenches.