Patent ID: 9099101
Filing Date: 2015-08-04
Classification: G11B

Abstract:
1. A method of testing a spindle motor of a hard disk drive, the method comprising: activating an idle mode of the hard disk drive; with the hard disk drive in the idle mode: determining a condition of the spindle motor based on comparing the magnitude of the vibrations at the targeted frequency to the threshold; and setting the condition of the spindle motor as a first condition indicating non-failure of the spindle motor if the magnitude of the vibrations at the targeted frequency does not exceed the threshold for any of the comparisons between the magnitude of the vibrations at the targeted frequency and the threshold before a predetermined number of comparisons between the magnitude of the vibrations at the targeted frequency and the threshold are performed; and setting the condition of the spindle motor as a second condition indicating failure of the spindle motor if the magnitude of the vibrations at the targeted frequency exceeds the threshold for each of the predetermined number of comparisons between the magnitude of the vibrations at the targeted frequency and the threshold.