Seagate Technology Incorporated

John C Heitke

Edward Stephens Murdock

Kevin Jon Schulz

Shanlin X Hao

Lars Halvar Ahlen

William P Wood

Ray V Rigles

A lapping system data acquisition unit is disclosed for use in measuring resistances of multiple resistors embedded in a structure to be machined. Each of multiple independent current sources directs a current through one of the multiple resistors embedded in the structure during machining of a surface of the structure. Each of multiple voltage sensing devices couples to a separate one of the multiple resistors and provides a separate analog voltage output signal indicative of the resistance of the resistor. Each of multiple filters is coupled to a separate one of the multiple voltage sensing devices Analog-to-digital conversion circuitry coupled to the multiple filters generates a digitized signal for each of the filtered output signals.

Electrical lap guide data acquisition unit and measurement scheme

A magnetoresistive head assembly includes a magnetoresistive sensor element, detection circuitry and first and second electrical conductors electrically connecting the magnetoresistive sensor element and the detection circuitry. A device exhibiting a non-linear voltage-current relationship is electrically coupled between the first and second electrical conductors. The device has a resistance which varies in relationship to an electrical potential between the first and second electrical conductors.

Method and apparatus for protecting magnetoresistive sensor element from

Growing community of inventors

Burnsville, MN, United States of America

John C Heitke