Patent ID: 8795763

Claim:
A process for forming magnetic data tracks on a recording disc, comprising: depositing an underlayer of magnetically soft material on said disc; depositing a first non-magnetic layer, having a surface, on said underlayer; depositing a layer of magnetic recording material on said non-magnetic layer; by using a mask, patterning said magnetic recording layer into at least two concentric data tracks whereby there are ring shaped trenches having floors and sidewalls, on each side of said data tracks each such trench extending downwards a distance below said first non-magnetic layer surface; while leaving said mask in place, depositing a conformal coating of a second non-magnetic material in said trench, including on said floor and sidewalls; then depositing a conformal layer of magnetic shielding material on said conformal second layer of non-magnetic material to a sufficient thickness to just fill the trenches; and then removing said mask, whereby each of said data tracks has a shielding track on both sides thereof.