US 2014/0153131 A1Published application

Disk storage apparatus and method for servo controlling

AssigneeKabushiki Kaisha Toshiba

InventorsTakuji MATSUZAWA, Takeyori HARA, Makoto ASAKURA, Takayuki KAWABE

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Abstract

According to one embodiment, a disk storage apparatus includes a servo system. The servo system includes a state observer and performs a seek operation up to a target position with a current position of a head undetermined. The servo system performs the seek operation based on initial values including a temporary position, while allowing the state observer to operate based on the initial values, until the current position is determined. The servo system determines the current position based on the servo data read from the plurality of servo areas by the read module and a result of estimation by the state observer.

Claims16

Dependent claims

A disk storage apparatus comprising:

a disk comprising a plurality of servo areas in which servo data detecting a radial position is recorded in a divisional manner;
a read module configured to read the servo data from the plurality of servo areas using a head;
and
a servo system comprising a state observer, wherein the servo system is configured to:
perform a seek operation based on initial values including a temporary position, while allowing the state observer to operate based on the initial values, until a current position of the head is determined, if the seek operation up to a target position is performed while the current position of the head is undetermined;
determine the current position based on the servo data read from the plurality of servo areas by the read module and a result of estimation by the state observer;
and
perform the seek operation up to the target position based on the determined current position.

5 more elements

A method of servo controlling in a disk storage apparatus comprising a disk comprising a plurality of servo areas in which servo data for detecting a radial position is recorded in a divisional manner, the method comprising:

reading the servo data from the plurality of servo areas using a head;
performing a seek operation based on initial values including a temporary position, while allowing a state observer to operate based on the initial values, until a current position of the head is determined, if the seek operation up to a target position is performed while the current position of the head undetermined,
determining the current position based on the servo data read from the plurality of servo areas and a result of estimation by the state observer;
and
performing the seek operation up to the target position based on the determined current position.

2 more elements

Dependencies are inferred from the claim text.