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Browse Prior Art Database

Capacitance To Detect L/UL Problems

IP.com Disclosure Number: IPCOM000016034D
Original Publication Date: 2002-May-16
Included in the Prior Art Database: 2003-Jun-21
Document File: 1 page(s) / 82K

Publishing Venue

IBM

Abstract

The slider/disk contact during load/unload can be detected by measuring the capacitance between the slider and disk. The diagrams below show the case (1) where the slider contacts the disk and (2) the slider does not contact the disk. The figures below show that the capacitance method can clearly detect head/disk contacts. The top figures in each plot are the change in the capacitance and the bottom figures in each plot are the LDV measurements of the loading process. Case (1): Slider contacts the disk during loading cycle. Case (2): The slider does not contact the disk during a loading cycle. 1

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Capacitance To Detect L/UL Problems

The slider/disk contact during load/unload can be detected by measuring the capacitance between the slider and disk. The diagrams below show the case (1) where the slider contacts the disk and (2) the slider does not contact the disk. The figures below show that the capacitance method can clearly detect head/disk contacts. The top figures in each plot are the change in the capacitance and the bottom figures in each plot are the LDV measurements of the loading process.

Case (1): Slider contacts the disk during loading cycle.

Case (2): The slider does not contact the disk during a loading cycle.

1

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