A connector that is configured to be installed on a printed circuit board and electrically connected to an external terminal is provided. A select data track of a storage medium is scanned for a defect. The glass of the present invention can have a soda-lime-silica glass base portion, with major colorants that provide the blue color. This new Raman spectrometer may be used to detect less than 40 ng of ammonium nitrate deposited on the silicon surface with the signal-to-noise ratio better than 50 during 0.