The present invention relates to repeatable runout (RRO) compensation of servo control systems that can be used in disc drives or spin-stands. The RRO relates to eccentricity between servo tracks, which were written onto a disc prior to the installation of the disc into the disc drive or spin-stand, and an axis of rotation of the disc. The present invention compensates the servo control loop by canceling the RRO and controlling a head to follow virtual tracks which are eccentric to the data tracks defined by the servo tracks and concentric with the axis of rotation of the disc.

 
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< Scaling linear vibration sensor data in disk drive

< Writing position data ex situ using an actuator retractable by a retractable support element

> Method for sensing run-out in data fields

> Disk drive reading servo sectors recorded at a relative offset on multiple disk surfaces to increase the servo sample rate

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