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An automatic gain calibration method based on model reference adaptation (MRA) for hard disk drive (HDD) servo is presented in this paper. The servo loop gain in the HDD servo control depends on magnetic flux density of actuator, head flying height, temperatures and other factors. Variations in VCM gain may cause variations in servo control stability margins and thus need to be compensated. The traditional...
This paper analyzed and modeled the major contributors of track misregistration (TMR) in HDD self servowriting (SSW). Self servowriting is a process whereby the position and timing burst information are written on the disk surface by using the servo information from previously written tracks as seed tracks for writing the burst information on the remaining tracks. One of the most significant issues...
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