发明授权
摘要:
An optical disc including a substrate having a top surface provided with a ROM area and a RAM area, and a recording layer provided on the substrate. The ROM area is provided with pre-grooves each having a bottom surface and wherein the RAM area is provided with pre-grooves. The ROM area also has pre-pits formed on the bottom surface of the pre-grooves thereof.
公开/授权文献
- US20020085485A1 Optical recording disc 公开/授权日:2002-07-04
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