Patent ID: 6545835
Filing Date: 2003-04-08
Classification: G11B

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