Patent ID: 6707635
Filing Date: 2004-03-16
Classification: G11B

Abstract:
A method of determining a plurality of repeatable runout (RRO) compensation value sets for a plurality of tracks on a rotating disk of a disk drive, wherein each track comprises a plurality of embedded servo sectors that define a circumferential path that may have RRO requiring compensation during track following and wherein the disk drive is initially manufactured and then shipped for Installation in a host system, the method comprising:determining, during initial manufacturing of the disk drive, first RRO value sets for a first portion of the tracks to a first desired learning level by measuring the RRO for the first portion tracks based on at least a first predetermined number of disk rotations; and determining, after the disk drive is shipped for installation in the host system, RRO value sets for a second portion of the tracks to a second desired learning level by measuring the RRO for the second portion tracks based on at least a second predetermined number of disk rotations.