Recording media, recording and reproducing apparatus, and method for recording and reproducing
AssigneeKabushiki Kaisha Toshiba
InventorsMasatoshi Sakurai, Takeshi Okino
Life of this patent
Estimating the term…
Abstract
A magnetic recording layer is formed on a surface of a substrate in magnetic recording media to define magnetic recording regions. Magnetic missing portions are provided in the magnetic recording regions, information cannot be magnetically recorded in the magnetic missing portions. The present invention provides magnetic recording media that enables authentication.
Claims14
A recording and reproducing apparatus comprising:
- a magnetic recording medium comprising recording tracks extended on a surface of the substrate so as to lie adjacent to one another, magnetic recording regions formed in each of the recording tracks and having a magnetic recording layer which enables information to be magnetically recorded, and magnetic missing portions which are formed in each of the recording tracks so as to separate the magnetic recording regions from one another, no information being magnetically recorded in the magnetic missing portions;
- an acquiring section which acquires position identifying information enabling positions of the magnetic missing portions to be identified;
- a recording and reproducing section which records information in a recording layer in the magnetic recording medium and which reproduces information from the recording layer;
- and
- an authenticating section which extracts the positions of the missing portions from the information reproduced by the recording and reproducing section and which compares the extracted missing positions with the position identifying information to authenticate the magnetic recording medium.
A method for recording information in a recording layer in a magnetic recording medium and reproducing the information from the recording layer, the magnetic recording media comprising recording tracks extended on a surface of the substrate so as to lie adjacent to one another, magnetic recording regions formed in each of the recording tracks and having a magnetic recording layer which enables information to be magnetically recorded, and magnetic missing portions which are formed in each of the recording tracks so as to separate the magnetic recording regions from one another, no information being magnetically recorded in the magnetic missing portions, the method comprising:
- acquiring position identifying information that enables positions of the magnetic missing portions to be identified, and
- extracting the positions of the missing portions from the reproduced information and comparing the extracted missing positions with the position identifying information to authenticate the magnetic recording medium.
A method for authentication comprising:
- reading identification (ID) information from a magnetic recording medium comprising recording tracks extended on a surface of the substrate so as to lie adjacent to one another, magnetic recording regions formed in each of the recording tracks and having a magnetic recording layer which enables information to be magnetically recorded, and magnetic missing portions which are formed in each of the recording tracks so as to separate the magnetic recording regions from one another, no information being magnetically recorded in the magnetic missing portions, the ID information identifying a sequence of the magnetic missing portions, and then searching the magnetic recording medium to identify the positions of the magnetic missing portions to generate magnetic missing position information;
- and
- outputting the ID information and the magnetic missing position information to have the magnetic recording medium authenticated.
A magnetic recording medium comprising:
- a substrate;
- recording tracks extended on a surface of the substrate so as to lie adjacent to one another;
- magnetic recording regions formed in each of the recording tracks and having a magnetic recording layer which enables information to be magnetically recorded;
- and
- magnetic missing portions which are formed in each of the recording tracks so as to separate the magnetic recording regions from one another, no information being magnetically recorded in the magnetic missing portions, wherein positional information that enables positions of the missing portions to be identified is recorded in each magnetic recording track as magnetically non-erasable patterns.
A magnetic recording medium comprising:
- a substrate;
- recording tracks extended on a surface of the substrate so as to lie adjacent to one another;
- magnetic recording dots periodically formed in each of the recording tracks and made of a magnetic recording layer which enables information to be magnetically recorded in the magnetic recording layer;
- and
- magnetic missing portions which are formed in each of the recording tracks so as to separate the periodic sequence of the magnetic recording dots into pieces, no information being magnetically recorded in the magnetic missing portions, wherein positional information that enables positions of the missing portions to be identified is recorded in each magnetic recording track as magnetically non-erasable patterns.
Dependencies are inferred from the claim text.