Method for correcting DC characteristics in a magnetic recording system

Abstract

A method includes: writing data in a magnetic recording system using a write channel of the magnetic recording system; processing output data of the write channel in accordance with a read channel of the magnetic recording system to measure baseline wander; and triggering re-writing through the write channel using different data scramblings when the measured baseline wander fails to satisfy a criterion. The processing can include modeling the read channel of the magnetic recording system, modeling one or more high pass filtering circuits of the magnetic recording system, or both. The writing can include encoding the data after scrambling of the data, the processing can include using a discrete time model of DC offset in the magnetic recording system, and the triggering can include triggering re-writing through the write channel using different scrambling seeds when the measured baseline wander fails to exceed a threshold.

Dependencies are inferred from the claim text.