Method of writing servo tracks on magnetic disc and device for the same
AssigneeFujitsu Limited
InventorsMasanori Fukushi, Tetsuya Nagai
Life of this patent
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Abstract
The method of the present invention is capable of shortening the time required for positioning an inner actuator and writing servo track signals on a magnetic disc, and improving the quality of the written servo track signals. The amount of displacement between the inner actuator and an external actuator is detected with a present position of the external actuator. A first deviation between a travel destination of the external actuator and a present position of the inner actuator is detected on the basis of the amount of the displacement, the present position of the external actuator and the travel destination thereof. The inner actuator is controlled so as to make the first deviation within a predetermined standard range.
Claims13
A method of writing servo tracks on a magnetic disc with signals for positioning a magnetic head, which is included in a magnetic disc drive unit having said magnetic head for writing data on and reading data from said magnetic disc, and an inner actuator for moving said magnetic head in substantially radial direction of said disc, comprising the steps of:
- detecting amount of displacement between said inner actuator and an external actuator, which is provided outside of said magnetic disc drive unit and which is capable of moving along a path of said inner actuator, and a present position of said external actuator;
- detecting first deviation between a travel destination of said external actuator and a present position of said inner actuator on the basis of the amount of the displacement, the present position of said external actuator and the travel destination thereof;
- and
- controlling the movement of said inner actuator so as to make the first deviation within a predetermined standard range.
A device for writing servo tracks on a magnetic disc with signals for positioning a magnetic head, which is included in a magnetic disc drive unit having said magnetic head for writing data on and reading data from said magnetic disc, and an inner actuator for moving said magnetic head in substantially radial direction of said disc,
- comprising:
- an external actuator being provided outside of said magnetic disc drive unit, said external actuator being capable of moving along a path of said inner actuator;
- a displacement sensor detecting amount of displacement between said inner actuator and said external actuator;
- a position sensor detecting a present position of said external actuator;
- a first control section moving said external actuator to a travel destination on the basis of the present position of said external actuator;
- and
- a second control section detecting first deviation between the travel destination of said external actuator and a present position of said inner actuator on the basis of the amount of the displacement, the present position of said external actuator and the travel destination thereof, said second control section controlling the movement of said inner actuator so as to make the first deviation within a predetermined standard range.
Dependencies are inferred from the claim text.