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Torque Amplification with Bias Current for Stiction

IP.com Disclosure Number: IPCOM000117928D
Original Publication Date: 1996-Jul-01
Included in the Prior Art Database: 2005-Mar-31

Publishing Venue

IBM

Related People

Authors:
Ohta, M Takahashi, K Yoneda, I [+details]

Abstract

Hard Disk Drive (HDD) fails to spin up due to excessive stiction between a slider and a disk. 'Torque Amplification' is a microcode based procedure that is executed when the HDD fails to start up normally. The HDD is excited by a pulsating force achieved by turning the motor on/off (max/zero) repeatedly, that is to drive the spindle motor so as to amplify the available torque via mechanical resonances to break free the stuck sliders.