Patent ID: 8619381

Claim:
A method for calibrating a read offset for a read-write head, comprising: writing a series of tracks onto a disk over a range of read offsets to be calibrated, wherein each track has a different offset with respect to a designated track on the disk; measuring a set of raw track profiles from the series of tracks, wherein each track in the series of tracks has a corresponding raw track profile in the set of raw track profiles, and the corresponding raw track profile comprises a series of signal amplitude measurements acquired at uncorrected read offsets; sampling the set of raw track profiles at a series of signal amplitude levels, thereby producing a set of sampled track profiles; constructing a reference track profile from the set of sampled track profiles; calculating a set of read offset deltas for each sampled track profile in the set of sampled track profiles, wherein each set of read offset deltas contains differences between the reference track profile and a sampled track profile in the set of raw track profiles; merging the sets of read offset deltas into a set of average read offset deltas; and converting the set of average read offset deltas into a read offset correction table.