Magnetic recording apparatus, magnetic recording medium and magnetic recording method
AssigneeHitachi, Ltd.
InventorsYasutaka Nishida, Takehiko Hamaguchi
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Abstract
The probability of occurrence of post-recording erasure phenomena in which recorded data is erased is reduced by adding at the end of a sector block a repetition pattern 56 of a minimum bit length for that sector block.
Claims8
A magnetic recording apparatus comprising:
- a perpendicular magnetic recording medium having a soft magnetic underlayer and a magnetic recording layer;
- a magnetic head including a recording head;
- a signal processing circuit for converting user data into a recording data sequence on a sector block by sector block basis;
- and
- a current driver for converting the recording data sequence into a recording current that is applied to the recording head, wherein
- the signal processing circuit adds at the end of the recording data sequence for each sector block a repetition pattern of a minimum bit length for the particular block, and the repetition pattern comprises four or more bits of repetitions of magnetization inversion at the intervals of a minimum-bit length of a relevant sector.
A perpendicular magnetic recording medium comprising a soft magnetic underlayer and a magnetic recording layer in which user data is recorded on a sector block by sector block basis, wherein, at the end of a recording data sequence in each sector block, a repetition pattern of a minimum bit length for the particular sector block is added, and the repetition pattern comprises four or more bits of repetitions of magnetization inversion at the intervals of a minimum-bit length of a relevant sector.
A method of recording information on a perpendicular magnetic recording medium comprising a soft magnetic underlayer and a magnetic recording layer using a recording head, the method comprising the steps of:
- converting inputted user data into a recording data sequence;
- adding a repetition pattern of a minimum bit length at the end of the recording data sequence, the repetition pattern comprising four or more bits of repetitions of magnetization inversion at the intervals of a minimum-bit length of a relevant sector;
- converting the recording data sequence to which the repetition pattern of the minimum bit length is added at the end thereof into a recording current;
- and
- driving the recording head with the recording current.
Dependencies are inferred from the claim text.