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.

主权项

1. A hard-disk drive, comprising:
a head slider comprising a read/write head and an embedded contact sensor (ECS); a magnetic-recording disk rotatably mounted on a spindle; a voice coil motor configured to move the head slider to access portions of the magnetic-recording disk; and an electronic component configured for:
applying a series of input voltages to said head slider,monitoring a head-disk spacing signal for each of said series of input voltages,identifying an interface voltage control (IVC) operating point voltage based on the relation between said head-disk spacing signals and said series of input voltages, andstoring a representation of said IVC operating point voltage in said hard-disk drive.