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US 8,711,503 B2Granted
Protecting information written to recording medium
AssigneeSeagate Technology International
InventorsSeong-yong Yoon, Tac-won Kim
Life of this patent
Estimating the term…
Abstract
A method of protecting information written to a recording medium includes magnetizing the recording medium to form a first magnetic pattern corresponding to information to be stored, and magnetizing the recording medium to form a protective magnetic pattern having a phase difference of 180° from the first magnetic pattern at a position adjacent to where the first magnetic pattern is formed, with adjacent bits of the first magnetic pattern opposite and the protective magnetic pattern opposite to each other.
Claims20
A method, comprising:
- magnetizing the recording medium to form a first magnetic pattern corresponding to information to be stored;
- and
- magnetizing the recording medium to form a protective magnetic pattern having a phase difference of 180° from the first magnetic pattern at a position adjacent to where the first magnetic pattern is formed, with adjacent bits of the first magnetic pattern and the protective magnetic pattern having opposite phases to each other.
A disk drive comprising:
- a disk having a plurality of tracks;
- a selective inversion circuit to selectively output a first signal to be written to the disk or an inversed first signal having a phase difference of 180° from the first signal;
- a preamplifier to generate a current corresponding to a signal output from the selective inversion circuit;
- a magnetic head to form a magnetic pattern on a track of the disk according to the current generated by the preamplifier;
- and
- a controller to control a position of the magnetic head and the selective inversion circuit so as to form a protective magnetic pattern having a phase difference of 180° from a first magnetic pattern according to the inversed first signal at a position of a track adjacent to the track of the disk where the first magnetic pattern is formed according to the first signal, with bits of adjacent tracks having opposite phases to each other.
3 more elements
A recording medium comprising:
- a recording layer where information is stored, and on which a protective magnetic pattern is formed having a phase difference of 180° from a first magnetic pattern corresponding to information to be stored at a position adjacent to where the first magnetic pattern is formed, with adjacent bits of the first magnetic pattern and protective magnetic pattern having opposite phases to each other.
Dependencies are inferred from the claim text.