Patent ID: 9646636
Date: 2017-05-09
CPC Classifications: B24B,G11B

Claim:
1. A row bar consisting of: a lapped air bearing surface that is spaced from an initial air bearing surface; at least one read-write head comprising a face surface; at least one electronic lapping guide comprising a reference surface; and a single trigger device comprising a reference surface, wherein the single trigger device is a digital device that is monitorable during a lapping process until a single back edge of the trigger device is lapped through to provide an open circuit reading, wherein the reference surface of each electronic lapping guide is positioned at a different distance from the initial and lapped air bearing surfaces than the reference surface of the single trigger device, wherein the reference surface of the single trigger device is below the lapped air bearing surface, and wherein the read-write head and the single trigger device comprise a multi-layer stack of materials, wherein the reference surface of at least one electronic lapping guide and the face surface of at least one read-write head are both above the lapped air bearing surface.