A method of determining run-out in a disc drive involving steps of performing a direct current erase, selecting a reference track, writing a sinusoidal signal into a first track at a first offset from the reference track, sensing a read signal along the reference track, and analyzing the read signal to extract run-out information.

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

< Virtual tracks for repeatable runout compensation

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

> System and method of constraining vibration in a disk drive unit and motor device

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