Patent ID: 8665550

Claim:
A method for reducing a disturbance associated with repeatable runout associated with a removable disc loaded into a storage system, the method comprising, at the storage system: generating a sequence of signals, wherein the sequence of signals are generated in accordance with an angle index phase lock loop (PLL) algorithm; based on the sequence of signals generated in accordance with the angle index phase lock loop (PLL) algorithm, logically partitioning the removable disc into a plurality of sectors; for each sector of the plurality of sectors, obtaining a corresponding profile of repeatable runout in the sector; applying a runout control algorithm to each sector of the plurality of sectors to generate a repeatable runout control (RROC) waveform that is usable to suppress the repeatable runout in the sector as indicated by the profile corresponding to the sector; assembling the repeatable runout control (RROC) waveforms generated for the plurality of sectors to generate a single repeatable runout control (RROC) waveform, wherein the single repeatable runout control (RROC) waveform is useable to suppress repeatable runout in an entire revolution of the removable disc; storing, in a first memory, the single repeatable runout control (RROC) waveform; removing a direct current element from the single repeatable runout control (RROC) waveform; and subsequent to removing the direct current element from the single repeatable runout control (RROC) waveform, transferring the single repeatable runout control (RROC) waveform from the first memory to a second memory.