Patent ID: 8120871
Filing Date: 2012-02-21
Classification: G11B

Abstract:
1. A method comprising: learning repeatable runout profiles of at least two sectors in a removable disc; generating repeatable runout control profiles for the at least two sectors based on the repeatable runout profiles; assembling the repeatable runout control profiles into a single repeatable runout control profile; storing the single repeatable runout control profile for the removable disc in a second memory; suppressing a repeatable runout of the removable disc via a feed-forward control loop, wherein operations of the feed-forward control loop are performed in a time domain; storing a feed-forward control value in a second memory to adaptively adjust the single repeatable runout control profile, wherein the feed-forward control value matches the repeatable runout of a target disc sector; transferring the single repeatable runout control profile from the second memory to a first memory subsequent to a spindle revolution; and removing a direct current element from the single repeatable runout control profile prior to the transferring of the single repeatable runout control profile.