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Self-learning RRO cancel by feed forward

IP.com Disclosure Number: IPCOM000014808D
Original Publication Date: 2001-Dec-29
Included in the Prior Art Database: 2003-Jun-20

Publishing Venue

IBM

Abstract

For HDD's servo control, RRO is a large factor to degrade the servo stability. The technical method described here is one of the technique to reduce RRO using feed forward servo control. There are three steps to cancel RRO by self learning and feed forward as followed. STEP-1: generate RRO information (calculate RRO components) STEP-2: update rro_table with dumping (RRO learning process) STEP-3: feed forward for coming sector (output process) In each steps, following calculation is done.