Evaluating dual stage actuator response in a disk drive by adding sinusoid to control signal
US8724254B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2011 |
| Grant date | May 13, 2014 |
| Priority date | — |
| Expiry date | Feb 14, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/596
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of evaluating a dual stage actuator (DSA) servo loop in a disk drive is disclosed. The disk drive comprises a dual stage actuator (DSA) servo loop operable to actuate a head over a disk surface. A first sinusoidal signal A1 is added to a VCM control signal B1 generated by a VCM servo loop. A response of the VCM control signal B1 to the first sinusoidal signal A1 is measured, and a closed loop response of the VCM servo loop is computed in response to A1 and B1. A second sinusoidal signal A2 is added to a microactuator control signal B2 generated by a microactuator servo loop. A response of the microactuator control signal B2 to the second sinusoidal signal A2 is measured, and a closed loop response of the microactuator servo loop is computed in response to A2 and B2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.