High-speed recording disk defect detection

摘要

A hard disk drive electronic component processes a signal from a piezoelectric actuator to identify where on a disk the slider encounters a disk defect. The signal received from the piezoelectric actuator may be based on the mechanical propagation, through the suspension to the piezoelectric actuator, of an effect of slider contact with the protrusion. Further, an actuator may be commanded to systematically move the head slider across the writeable portion of the disk to map all the protrusions on the writeable portion of the disk.

主权项

1. A hard disk drive comprising:
a disk media rotatably mounted on a spindle; a suspension comprising:
a flexure, anda multiple-stage actuator comprising at least one piezo actuating device coupled to said flexure and configured to provide a moment force for moving a head slider; an electronic component comprising one or more sequence of instructions which, when executed by one or more processor, causes performance of:
processing a disk defect signal from said multiple-stage actuator to determine that said head slider encountered a defect at a particular location on said disk media, andstoring an identifier corresponding to said particular location; and a voice coil motor configured to move said suspension and said head slider to access portions of said disk media.