Patent Number: 6,480,462

Title: Hybrid optical disc construction

Abstract: A hybrid optical recording disc having a substrate and a recording layerdisposed over the substrate, the substrate having a read-only (ROM) areain which a groove is modulated by depressions in the substrate and arecordable area in which the groove from the read-only area extends intothe substrate in the recordable area. The groove in the read-only areaforming wobbling tracks having a depth greater than 170 nm and wherein thedepth d2 of the depression in the groove in the read-only area is in arange greater than 170 nm and less than 350 nm.

Inventors: Ha; Bruce (Webster, NY), Barnard; James A. (Scottsville, NY), Burgo; Thomas C. (Brockport, NY)

Assignee:

International Classification: G11B 7/007 (20060101); G11B 007/24 ()

Expiration Date: 11/12014