Storage apparatus
A storage apparatus includes a magnetic storage medium which is formed with a data portion based on isolated magnetic dots and a servo pattern portion, a drive mechanism which drives the storage medium, a head actuator which includes a head for reading and writing data from and to the storage medium, and a permanent magnet which is disposed at a position that is opposable to a whole radial region of the servo pattern portion, during a rotation of the storage medium.
1. A storage apparatus, comprising:
a magnetic storage medium which is formed with a data portion based on isolated magnetic dots and a servo pattern portion;
a drive mechanism which drives said storage medium;
a head actuator which includes a head for reading and writing data from and to said storage medium; and
a permanent magnet which is disposed at a position that is opposable to a whole radial region of the servo pattern portion, during a rotation of said storage medium.
2. The storage apparatus as defined in claim 1 , wherein said permanent magnet is fixed to a housing of said storage apparatus in a region outside an operating range of said head actuator.
3. The storage apparatus as defined in claim 1 , wherein an air current stabilizing plate which stabilizes an air current flowing over a surface of said storage medium is fixed to a housing of said storage apparatus in a region outside an operating range of said head actuator, and the air current stabilizing plate is disposed in opposition to said storage medium; and
said permanent magnet is mounted on a part of said air current stabilizing plate.
4. The storage apparatus as defined in claim 3 , wherein air current stabilizing plates are unitarily attached to both sides of said permanent magnet.
5. The storage apparatus as defined in claim 3 , wherein said permanent magnet is disposed in a state where said permanent magnet is stuck on a front surface of said air current stabilizing plate.
6. The storage apparatus as defined in claim 5 , wherein permanent magnets are disposed in a state where said permanent magnets are stuck on both surfaces of said air current stabilizing plate.
7. The storage apparatus as defined in claim 3 , wherein said permanent magnet is disposed in a state where said permanent magnet is buried in said air current stabilizing plate.
8. The storage apparatus as defined in claim 3 , wherein said permanent magnet is disposed in a state where said permanent magnet is fitted in a recess which is provided in a front surface of said air current stabilizing plate.
9. The storage apparatus as defined in claim 3 , wherein said air current stabilizing plate is disposed in a state where an end part thereof is fixed to a wall member which is protruded on a bottom surface of the housing.
10. The storage apparatus as defined in any of claims 1 , wherein said permanent magnet is disposed in a vicinity of a position whose distance from the head is the largest.
11. The storage apparatus as defined in any of claims 1 , wherein permanent magnets are disposed on both surfaces of said storage medium, and directions of magnetizations of said permanent magnets are identical to a direction of a magnetization of said servo pattern portion.
12. A storage apparatus as defined in any of claims 11 , wherein an intensity of said permanent magnet is a value smaller than a magnetization inversion initiation magnetic field of each magnetic dot, at a position of the magnetic dot in the data portion.
13. The storage apparatus as defined in claim 12 , wherein a coercive force of said permanent magnet is less than 3000 Oe.
14. The storage apparatus as defined in claim 1 , wherein said permanent magnet is formed in a tapered shape so that an end part of said permanent magnet does not disturb a flow of an air current which flows over a surface of said storage medium.
15. A storage apparatus as defined in any of claims 1 , wherein said storage medium is a bit patterned medium (BPM) in which regions of nonmagnetic parts are formed between recording tracks, in a data portion, and in which the recording tracks are divided by nonmagnetic parts, thereby forming the isolated magnetic dots in a track direction on the disk medium.
16. A storage apparatus as defined in any of claims 1 , wherein said storage medium is a discrete track medium (DTM) in which regions of nonmagnetic parts are formed between recording tracks, in a data portion.
17. The storage apparatus as defined in claim 1 , wherein said permanent magnet is a neodymium magnet or a samarium-cobalt magnet.