An Algorithm to Reduce Disk Damage Resulting from Slider/Disk Contacts During Load/Unload
Original Publication Date: 2002-Dec-03
Included in the Prior Art Database: 2002-Dec-03
An Algorithm to Reduce Disk Damage Resulting from Slider/Disk Contacts during Load/Unload
During load/unload (L/UL) cycles, the slider can contact the disk and cause disk damage, creating debris that can cause disk damage elsewhere on the disk. Resulting debris may also cause head/disk crash. An algorithm can be applied to reduce the potential for disk damage during L/UL cycles by lowering the disk speed if the slider/disk contact rate is over the design point.
The slider/disk contact events can be detected by many methods: capacitance, pzt, resistive, MR sensor, etc. By utilizing any of these or similar methods, the rate of slider/disk contact is monitored. If the rate and/or rate of change of the rate is beyond a specified design point, the loading cycles are carried out at reduced disk speeds.
Disclosed by International Business Machines Corporation