Patent ID: 6724693
Filing Date: 2004-04-20
Classification: G11B

Abstract:
An optical disk device in combination with an optical disk, said optical disk comprising:a central opening and an outer circumferential edge with: a recording area for recording programs defined therebetween, a lead-out area defined between said recording area and said outer circumferential edge, and an outside area defined outside of said recording area and said lead-out area, a first side having thereon a label indicating at least a recording data, a second side opposite to said first side, and a magnetic substance formed on said outside area of said first side, wherein said optical disk device comprises: an optical reading device positioned adjacent said second side of said optical disk to read signals from said optical disk recording area, and a magnetic sensor positioned adjacent said second side of said optical disk to read said magnetic substance formed on said optical disk outside area, wherein said optical reading device and said magnetic sensor are positioned relative to each other so that such device and sensor do not collide when reading their respective optical disk areas.