Magnetic disk device and method of controlling the same
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsSho Suzuki, Takeyori Hara
Life of this patent
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Abstract
According to one embodiment, a magnetic disk device includes an actuator which holds a magnetic head to move in a radial direction of a magnetic disk with voice coil motor drive, and a controller. The controller moves a magnetic head from a current position to a target position by controlling the voice coil motor drive. The controller calculates an acceleration of the magnetic head, based on a position history of the magnetic head, and calculates an acceleration of the magnetic head, based on a value of a drive current of the voice coil motor. The controller detects vibration occurring in the actuator, based on a difference between the calculated accelerations.
Claims20
A magnetic disk device comprising:
- a magnetic disk;
- a magnetic head which writes and reads data to and from the magnetic disk;
- an actuator which holds the magnetic head to move in a radial direction of the magnetic disk with voice coil motor drive;
- and
- a controller which controls move of the magnetic head, wherein
- the controller includes:
- a seek control section which moves the magnetic head from a current position on the magnetic disk to a target position by controlling the voice coil motor drive;
- an acceleration calculation section which calculates an acceleration of the magnetic head, based on a radial direction position history of the magnetic head, and calculates an acceleration of the magnetic head, based on a value of a drive current of the voice coil motor;
- and
- an vibration detection section which detects vibration occurring in the actuator, based on a difference between the acceleration based on position history and the acceleration based on a value of a drive current of the voice coil motor detected by the acceleration calculation section.
A method of controlling a magnetic disk device comprising a magnetic disk, a magnetic head writing and read data to and from the magnetic disk, an actuator holding the magnetic head to move in a radial direction of the magnetic disk with voice coil motor drive, and a controller controlling movement of the magnetic head,
- the method comprising:
- moving the magnetic head from a current position on the magnetic disk to a target position by controlling the voice coil motor drive;
- calculating an acceleration of the magnetic head based on a position history of the magnetic head, and an acceleration of the magnetic head based on a value of a drive current of the voice coil motor;
- and
- detecting vibration occurring in the actuator, based on a difference between the calculated acceleration based on position history and the acceleration based on a value of a drive current of the voice coil motor.
A magnetic disk device comprising:
- a magnetic disk;
- a magnetic head which writes and reads data to and from the magnetic disk;
- an actuator which holds the magnetic head to move in a radial direction of the magnetic disk with voice coil motor drive;
- and
- a controller which controls move of the magnetic head, wherein
- the controller includes:
- a seek control section which moves the magnetic head from a current position on the magnetic disk to a target position by controlling the voice coil motor drive;
- an acceleration calculation section which calculates an acceleration of the magnetic head, based on a radial direction position history of the magnetic head, and calculates an acceleration of the magnetic head, based on a value of a drive current of the voice coil motor;
- and
- an vibration detection section which determines that the vibration caused by rise of the drive current for acceleration of the voice coil motor occurs in the actuator when a difference between the acceleration based on position history of the magnetic head and the acceleration based on a value of a drive current of the voice coil motor calculated by the acceleration calculation section is greater than or equal to a predetermined threshold value.
Dependencies are inferred from the claim text.