Western Digital (Fremont), Inc.

Hmt Technology Corporation

Reginald Lee

Ming M Yang

Peter C Jann

Marco A Krumbuegel

A row bar holder to hold a plurality of row bars containing reader heads for scanning operations is disclosed. The row bar holder includes: a base fixture having a length defining a y-axis and a width defining an x-axis, a plurality of separator walls formed on a top surface of the base fixture spaced from one another to separate the plurality of row bars containing reader heads, a plurality of grooves defined between the adjacent separator walls to receive the row bars, respectively, and a draw bar mountable within the base fixture, the draw bar having a plurality of draw bar walls that approximately align with the plurality of separator walls of the base fixture along the y-axis.

Row bar holder

An apparatus for measuring the height and diameter of laser-zone texture bumps on a rigid magnetic disk substrate is disclosed. The apparatus has a disk holder for supporting and rotating the substrate, and an optical beam-source assembly for directing a focused laser beam on the substrate, and for shifting the position of the beam's illumination spot on the substrate in a tracking (radial) direction. An optical detection assembly in the apparatus measures the deflection of the laser beam due to specular reflection of the beam by laser-zone texture bumps, as a function of time, in both scanning (circumferential) and tracking directions. A computational device in the apparatus functions to (i) calculate scanning and tracking deflection values which characterize beam deflections in the scanning and tracking directions, respectively, for a texture bump passing through the illumination spot produced by the beam on the substrate, (ii) select for bump-height analysis, those texture bumps whose scanning deflection values are above a selected threshold value and whose tracking deflection values are below a selected threshold value, indicative of a condition in which the selected textured bumps are each in focus and centered within said illumination spot, and (iii) determine the texture bump heights and diameters of the selected bumps from the beam deflections in the scanning direction. Also disclosed is a method by which the apparatus measures the light power which is scattered by the of laser-zone texture bumps on a rigid magnetic disk substrate.

Growing community of inventors

Alameda, CA, United States of America

Reginald Lee