Storage medium, reproducing method, and recording method
AssigneeKabushiki Kaisha Toshiba
InventorsSeiji Morita, Koji Takazawa, Kazuyo Umezawa, Hideo Ando, Yasuaki Ootera, Naoki Morishita, Naomasa Nakamura
Life of this patent
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Abstract
According to an embodiment, a storage medium includes a transparent resin substrate having a concentric or spiral groove and a recording film formed on the groove on the transparent resin substrate, a recording mark being formed by irradiation of a laser beam, wherein a reproduction durability count in a case where reproduction is continuously carried out by a laser beam is 1,000,000 or more.
Claims2
A read-only storage medium having double-layer structure, the storage medium comprising:
- a first-layer being distant from a light source, the first-layer having a burst cutting area, a system lead-in area, a data lead-in area, and a first data area,
- the burst cutting area being located inward of the system lead-in area,
- the system lead-in area being located inward of the data lead-in area,
- the data lead-in area being located inward of the first data area, and
- the system lead-in area having a first track pitch larger than a second track pitch of the data lead-in area;
- and
- a second-layer having a system lead-out area, a data lead-out area, a second data area,
- the system lead-out area being located inward of the data lead-out area,
- the data lead-out area being located inward of the second data area,
- the system lead-out area having a third track pitch larger than a fourth track pitch of the data lead-out area, and
- a whole of the data lead-in area and a whole of the data lead-out area overlap each other in a radial direction.
A reproducing method for reproducing data from a read-only storage medium,
- the storage medium including a first-layer and a second-layer,
- the first-layer being distant from a light source,
- the first-layer having a burst cutting area, a system lead-in area, a data lead-in area, and a first data area,
- the burst cutting area being located inward of the system lead-in area,
- the system lead-in area being located inward of the data lead-in area,
- the data lead-in area being located inward of the first data area, and
- the system lead-in area having a first track pitch larger than a second track pitch of the data lead-in area;
- and
- the second-layer having a system lead-out area, a data lead-out area, and a second data area,
- the system lead-out area being located inward of the data lead-out area,
- the data lead-out area being located inward of the second data area,
- the system lead-out area having a third track pitch larger than a fourth track pitch of the data lead-out area, and
- a whole of the data lead-in area and a whole of the data lead-out area overlap each other in a radial direction, the reproducing method comprising:
- irradiating the storage medium with light;
- and
- reproducing the data recorded in the first or second data area based on the irradiated light.
Dependencies are inferred from the claim text.