"Symbol Technologies, Inc.Method and apparatus for reading and writing indicia such as bar codes using a scanned laser beamUS6552969Jun 12, 2000Apr 22, 2003Matsushita Electric Industrial Co., Ltd.Optical disk, an optical disk barcode forming method, an optical disk reproduction apparatus, a marking forming apparatus, a method of forming a laser marking on an optical disk, and a method of manufactur" . . . . .