Perpendicular magnetic recording medium, manufacturing method thereof and magnetic recording device
AssigneeFujitsu Limited
InventorNobuhide Aoyama
Life of this patent
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Abstract
A servo pattern is positioned in a DC erased portion to which a DC erase process has been performed, and recording tracks and track groove portions (discrete portions) are positioned in an AC erased portion to which an AC erase process has been performed. The track groove portions extend in a circumferential direction. The AC erased portion and the DC erased portion are both made of a magnetic material. In the servo pattern, four lines of preamble portions extending almost in a radial direction are formed and a plurality of pit portions disposed in a dotted manner in two lines are arranged. The pit portions are positioned rearward of the preamble portions in respect of a scanning direction of a magnetic head.
Claims15
A perpendicular magnetic recording medium comprising:
- a plurality of recording tracks extending in parallel with each other, an AC erase process having been performed to said recording tracks;
- and
- a servo pattern intervening in each of said recording tracks, a DC erase process having been performed to said servo pattern.
A perpendicular magnetic recording medium comprising:
- a plurality of recording tracks extending in parallel with each other;
- and
- a servo pattern intervening in each of said recording tracks, a magnetic servo information having been recorded to said servo pattern, and an AC erase process having been performed to said recording tracks and said servo pattern.
A magnetic recording device comprising:
- a perpendicular magnetic recording medium having:
- a plurality of recording tracks extending in parallel with each other, an AC erase process having been performed to said recording tracks;
- and
- a servo pattern intervening in each of said recording tracks, a DC erase process having been performed to said servo pattern;
- and
- a magnetic head recording information into said perpendicular magnetic recording medium and reproducing information from said perpendicular magnetic recording medium.
A magnetic recording device comprising:
- a perpendicular magnetic recording medium having:
- a plurality of recording tracks extending in parallel with each other;
- and
- a servo pattern intervening in each of said recording tracks, a magnetic servo information having been recorded to said servo pattern, and an AC erase process having been performed to said recording tracks and said servo pattern;
- and
- a magnetic head recording information into said perpendicular magnetic recording medium and reproducing information from said perpendicular magnetic recording medium.
A manufacturing method of a perpendicular magnetic recording medium, comprising the steps of:
- forming a plurality of recording tracks extending in parallel with each other and a servo pattern intervening in each of said recording tracks;
- performing a DC erase process to said recording tracks and said servo pattern;
- and
- performing an AC erase process to said recording track.
Dependencies are inferred from the claim text.