A projector has an image generating device for generating an image, and a housing, having the image generating device disposed therein and having an opening defined therein for emitting therethrough projection light representing the image from the image generating device. In one embodiment, the method comprises operating a virtual computer system on a physical computer system, and the virtual system maintains in a memory area a record of a state of the virtual system. The polymeric film is disposed over conductive wiring or used as a conductor winding insulator for phase separation and slot liner. At least one missing or wrong positioned sync mark on a read data page is identified and its corrected position is estimated.