Patent ID: 6959586
Filing Date: 2005-11-01
Classification: G11B

Abstract:
1. A method for evaluating a multiplicity of data handling devices each having a sealed chamber with several interior surfaces, the method comprising steps of: (a) selecting at least one of the multiplicity of data handling devices, the selected device(s) having a cavity and a sealed housing portion adjacent thereto by steps comprising: (b) providing an impurity chamber at a first pressure and containing thousands of dispersed gas-borne particles that each contain a marker impurity that is substantially absent from all of the interior surfaces of the selected device(s); (c) exposing the sealed portion of the selected data handling device(s) to the impurity chamber while maintaining a pressure of the cavity at a second pressure lower than the first pressure; and (d) evaluating the multiplicity of data handling devices based on an indication of whether the marker impurity was present in the selected device(s) in an amount exceeding a predetermined threshold.