Disc-shaped recording medium with magnetic data and read out region
AssigneeSony Corporation
InventorNobuyuki Kihara
Life of this patent
Estimating the term…
Abstract
A disc-shaped recording medium capable of being rewritten comprises: a lead-in area which is provided in the inner rim of the disc shaped recording medium and in which information concerning the disc-shaped recording medium is prerecorded; a data area which is provided in the outer periphery of lead-in area and which is capable of recording data; and a lead-out area which is provided in the outer periphery of the data area and which indicates the end of the data area, the lead-out area being a recordable area the same as data area.
Claims7
A disc-shaped recording medium capable of being rewritten comprising:
- a lead-in area which is provided in the inner rim of said disc-shaped recording medium and in which read-only information concerning said disc-shaped recording medium is prerecorded along with read-only address information;
- a data area which is provided in the outer periphery of said lead-in area and which is capable of recording data;
- and
- a lead-out area which is provided in the outer periphery of said data area and which indicates the end of said data area, said lead-out area also being a recordable area, and having recorded therein a detectible, predetermined pattern;
- wherein said data area and said lead-out area have concentric or spiral recording tracks with guide grooves and address information is prerecorded in said data area and said lead-out area by displacing said guide grooves in the radial direction of said disc-shaped recording medium as a wobble component in said guide grooves.
A disc-shaped magneto-optic recording medium capable of being rewritten comprising:
- a read only lead-in area which is provided in the inner rim of said disc-shaped recording medium and in which information concerning said disc-shaped recording medium is prerecorded along with read-only address information;
- a magneto-optic data area which is provided in the outer periphery of said lead-in area and which is capable of recording data;
- and
- a magneto-optic lead-out area which is provided radially outward of the dam area and which indicates the end of the data area, the lead-out area having a predetermined pattern of magneto-optically recorded marks in a magnetizing direction of a perpendicular magnetization film on the disc-shaped recording medium in the lead-out area;
- wherein said data area and said lead-out area have concentric or spiral recording tracks with guide grooves and address information is prerecorded in said data area and said lead-out area by displacing said guide grooves in the radial direction of said disc-shaped recording medium as a wobble component in said guide grooves.
In combination, a magneto-optic disc and a magneto-optic disc reproducing apparatus comprising:
- a disc-shaped recording medium capable of being rewritten comprising,
- a premastered area wherein data is recorded by physical pits corresponding to a lead-in area, and
- a magneto-optically recordable data area;
- a magneto-optically recordable lead-out area, radially outward of the data area, and in which is recorded a predetermined pattern, demarking the end of the data area, by marks in a magnetizing direction of a perpendicular magnetization film on said disc-shaped recording medium;
- a magnetic head for recording and reproducing information onto and from said disc-shaped recording medium;
- an optical pickup for recording and reproducing information onto and from said disc-shaped recording medium;
- a discriminating means for determining whether the optical pickup is tracing said premastered area or said magneto-optic area,
- said discriminating means comprising an adding circuit, a detecting circuit, and a comparator.
Dependencies are inferred from the claim text.