System for testing magnetic head/disk interfaces

US4724392A · kind A · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Upali Bandara · Leimen, DE
• Gerhard Elsner · Kaarst, DE
• Volker Heinrich · Nordstemmen, DE
• Holger Hinkel · Böblingen, DE
• Artur Lang · Worms, DE
• Erwin J. Prinz · Austin, US
• Werner Steiner · Schrobenhausen, DE
• Werner Zapka · Gärtringen, DE

Key dates

• Filing date: Apr 28, 1986
• Grant date: Feb 9, 1988
• Expiry date: Apr 28, 2006

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B17/32
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Method for measuring the properties of a slider/disk interface in a magnetic disk storage apparatus by measuring a triboelectric current flowing between disk and slider. Rotational speed is adjusted between 100 and 500 rpm so as to obtain a frictional contact between disk and slider. The shape of the tribo current curve obtained during the measuring time interval is analyzed. An early maximum of the tribo current amplitude and a subsequent continual decay indicates a good slider/disk interface and a long lifetime.