INTERFACE VOLTAGE CONTROL OPERATING POINT DETERMINATION IN A HARD DISK DRIVE

摘要

Approaches for an interface voltage control (IVC) system in a hard-disk drive (HDD), whereby the IVC operating point determination scheme utilizes non-contact spacing signals for calibration of IVC. While applying a series of input voltages to a slider, head-disk spacing signals are monitored, such as spacing signals from an embedded contact sensor or Wallace spacing loss spacing signals. Based on the relation between the spacing signal values and the series of input voltages, the IVC operating point is identified and stored within the HDD. The IVC operating point corresponds to the IVC input voltage necessary to neutralize the natural slider-disk voltage potential that would otherwise cause an electrostatic force that pulls the slider closer to the disk and can cause lubrication transfer from disk to slider.