HDD track following control apparatus and method
AssigneeSamsung Electronics Co., Ltd.
InventorsDa-woon Chung, Jung-ho Lee
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Abstract
A track following control apparatus and method for a hard disk drive (HDD) is disclosed and includes an estimator receiving a position error signal from a HDA and generating estimated state information for a magnetic head in response to the position error signal, and a controller receiving the estimated state information and generating a control signal controlling operation of the HAD, wherein the estimator and controller are variably configured according to a write mode or a read mode.
Claims20
A method implementing track following control in a hard disk drive (HDD) operating in a write mode or a read mode, the HDD comprising an estimator providing estimated state information for a head, and a controller controlling operation of a head disk assembly (HDA) moving the head in response to the estimated state information and generating a corresponding position error signal, the method comprising:
- configuring the estimator and controller differently based on whether the HDD is operating in the write mode or the read mode;
- and
- performing track following control using the differently configured estimator and controller.
A method implementing track following control in a hard disk drive (HDD) comprising a head disk assembly (HDA) moving a magnetic head over a disk, the method comprising:
- receiving either a write command or a read command in the HDD;
- and
- when the write command is received,
- selecting a write mode estimator and a write mode controller for operation;
- by operation of the write mode estimator, applying at least one gain constant to a signal derived from a position error signal received from the HDA to generate estimated state information;
- and
- by operation of the write mode controller, applying at least one gain constant to the estimated state information to generate a control signal controlling movement of the head by the HDA during a write mode of operation for the HDD;
- and
- when the read command is received,
- selecting a read mode estimator and a read mode controller for operation;
- by operation of the read mode estimator, applying at least one gain constant to a signal derived from a position error signal received from the HDA to generate the estimated state information;
- and
- by operation of the read mode controller, applying at least one gain constant to the estimated state information to generate a control signal controlling movement of the head by the HDA during a read mode of operation for the HDD.
A track following control apparatus for a hard disk drive (HDD) comprising a head disk assembly (HDA) moving a magnetic head over a disk, the apparatus comprising:
- an estimator configured to receive a position error signal from the HDA and to generate estimated state information for the magnetic head in response to the position error signal, the estimator comprising a write mode estimator applying a first estimator gain constant to the position error signal to generate first estimated state information, and a read mode estimator applying a second estimator gain constant to the position error signal to generate second estimated state information, wherein the first and second estimator gain constants are different;
- and
- a controller configured to receive the estimated state information and to generate a control signal to control operation of the HDA,
- wherein the estimator and controller are variably configured in a write mode and a read mode.
A track following control apparatus for a hard disk drive (HDD) comprising a head disk assembly (HDA) moving a magnetic head over a disk, the apparatus comprising:
- an estimator configured to receive a position error signal from the HDA and to generate estimated state information for the magnetic head in response to the position error signal;
- and
- a controller configured to receive the estimated state information and to generate a control signal to control operation of the HDA, the controller comprising a write mode controller applying a first controller gain constant to the first estimated state information to generate a control signal controlling operation of the HDA, and a read mode controller applying a second controller gain constant to the second estimated state information to generate a control signal controlling operation of the HDA,
- wherein the first and second controller gain constants are different, and
- wherein the estimator and controller are variably configured in a write mode and a read mode.
A track following control apparatus for a hard disk drive (HDD) comprising a head disk assembly (HDA) for moving a magnetic head over a disk, the track following control apparatus comprising:
- an estimator configured to receive a position error signal from the HDA and to generate estimated state information for the magnetic head in response to the position error signal;
- and
- a controller configured to receive the estimated state information and to generate a control signal for controlling operation of the HDA;
- wherein the estimator and controller are variably configured in a write mode and a read mode, such that the magnetic head is moved in accordance with a reduced tolerance in the read mode as compared to the write mode.
Dependencies are inferred from the claim text.