Optical disc with pre-recorded and recordable regions and method of forming the disc
View Patent ↗An optical disc having a region with pre-recorded data and a recordable region, a method of fabricating the disc, a stamper for forming a disc master, and a recording device for use with the disc are disclosed. Data recorded in the recordable region may be used for activation of the disc, providing unique identification or enhancing program content on the disc.
1. An optical disc, comprising:
a recordable region having at least one groove with a plurality of gaps;
wherein the at least one groove is configured for use in recording data, after disc manufacturing, to at least one of: the at least one groove and one of the plurality of gaps; and
wherein each of the plurality of gaps has a length sufficient for differential phase detection tracking, and each of the plurality of gaps has a length less than about 200 nm.
2. The optical disc of claim 1 , where a separation between adjacent gaps is less than about 10 μm.
3. The optical disc of claim 1 , wherein a separation between adjacent gaps is between about 0.5 μm and 2 μm.
4. The optical disc of claim 1 , wherein each of the plurality of gaps has a length of at least about 75 nm.
5. The optical disc of claim 1 , wherein the at least one groove has a depth ranging from about 10 nm to about 300 nm.
6. The optical disc of claim 1 , wherein the at least one groove has a width between about 50 nm to about 250 nm.
7. The optical disc of claim 1 , further comprising a region with pre-recorded data.
8. An optical disc, comprising:
a recordable region having at least one groove with a plurality of gaps;
wherein the at least one groove is configured for use in recording data, after disc manufacturing, to at least one of: the at least one groove and one of the plurality of gaps; and
wherein each of the plurality of gaps has a length sufficient for differential phase detection tracking, and the at least one of the plurality of gaps has a length less than about 200 nm.