Browse Prior Art Database

Dynamic Calibration Technique for Glide Head Transducers

IP.com Disclosure Number: IPCOM000062789D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Pham, TN: AUTHOR

Abstract

A method is described for calibrating a glide head transducer used in testing magnetic disk surface defects by the application of an electrical signal of known shape to excite the glide head to simulate a disk defect.

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Dynamic Calibration Technique for Glide Head Transducers

A method is described for calibrating a glide head transducer used in testing magnetic disk surface defects by the application of an electrical signal of known shape to excite the glide head to simulate a disk defect.

A commonly used test to characterize a magnetic recording disk surface utilizes what is called glide testing. In this testing a glide head is scanned over the disk surface as the disk is rotating, and a signal is sensed from the glide proportional to the level of disturbance caused by disk defects.

In order to calibrate the sensitivity of different glide heads, an electrical signal of known shape is coupled to excite the glide head 1 via pre amp 2 while the head is flying over the rotating disk 3. The glide head 1 is excited by this pulse and resonates at the head air bearing natural frequency after the pulse is removed, in a manner similar to a disk defect. The head ouput is measured by a capacitance meter 4 and this output is then processed as usual by signal processing circuit 5. Since the signal used to excite the head can be precisely controlled, this calibration method produces accurate calibration data which has been confirmed by comparison to calibration data generated by other techniques.

Disclosed anonymously.

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