Embodiments of an image reader andor methods of operating an image reader can capture an image, identify a bar code or IBI form within the captured image, and, store or display the captured image responsive to the an orientation of the bar code. A drive unit is provided and configured to removably receive a removable digital storage medium such as an optical disc. The method further includes: forming an interlayer insulating film so as to cover the stacked film; and removing the interlayer insulating film formed in the contact hole formation region to form a contact hole leading to the second metal film. An anchor with a bore with two taper angles and tooth profiles of threading patterns on the internal surface of the wedge are also disclosed.