Storage medium, reproducing method, and recording method
AssigneeKabushiki Kaisha Toshiba
InventorsHideo ANDO, Seiji Morita, Koji Takazawa, Yasuaki Ootera, Naoki Morishita, Kazuyo Umezawa
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Abstract
According to one embodiment, a write-once type information storage medium comprises an organic dye based recording material having sensitivity at a wavelength of 405 nm and at a recording wavelength in the range of 600 nm to 700 nm, wherein, when absorbance of a maximum absorption wavelength in the vicinity of 405 nm is defined as 1, the absorbance is 5% or more at any wavelength in the range of 600 nm to 700 nm.
Claims3
A storage medium having double-layer structure, the storage medium comprising:
- a first-layer having a system lead-in area, a data lead-in area, and a first data area,
- the system lead-in area being inside the data lead-in area,
- the data lead-in area being inside the first data area, and
- the system lead-in area having a first track pitch bigger 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, and a second data area,
- the second data area being outside the data lead-out area,
- the data lead-out area being outside the system lead-out area, and
- the system lead-out area having the first track pitch and the data lead-out area having the second track pitch.
A reproducing method for reproducing data from a storage medium, the storage medium comprising a first-layer and a second-layer,
- the first-layer having a system lead-in area, a data lead-in area, and a first data area,
- the system lead-in area being inside the data lead-in area,
- the data lead-in area being inside the first data area,
- the system lead-in area having a first track pitch bigger than a second track pitch of the data lead-in area;
- the second-layer having a system lead-out area, a data lead-out area, and a second data area,
- the second data area being outside the data lead-out area,
- the data lead-out area being outside the system lead-out area, and
- the system lead-out area having the first track pitch and the data lead-out area having the second track pitch, the reproducing method comprising:
- irradiating the storage medium with a light;
- and
- reproducing the data recorded on the first or second data area.
A reproducing apparatus reproducing data from a storage medium, the storage medium comprising a first-layer and a second-layer,
- the first-layer having a system lead-in area, a data lead-in area, and a first data area,
- the system lead-in area being inside the data lead-in area,
- the data lead-in area being inside the first data area,
- the system lead-in area having a first track pitch bigger than a second track pitch of the data lead-in area;
- the second-layer having a system lead-out area, a data lead-out area, and a second data area,
- the second data area being outside the data lead-out area,
- the data lead-out area being outside the system lead-out area, and
- the system lead-out area having the first track pitch and the data lead-out area having the second track pitch, the reproducing apparatus comprising:
- an optical head configured to irradiate the storage medium with a light;
- and
- a reproducing module configured to reproduce the data recorded on the first or second data area.
Dependencies are inferred from the claim text.