Method, apparatus, and storage medium for controlling track seek servo in disk drive, and disk drive using same
AssigneeSamsung Electronics Co., Ltd.
InventorSang-eun Baek
Life of this patent
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Abstract
Provided are a method, apparatus, and storage medium for controlling a track seek servo in a disk drive. Thus, a transducer is moved to a target track using a transformed Proximate-Time Optimal Servo (PTOS) velocity trajectory in which an acceleration duration is symmetrical to a deceleration duration in a track seek mode.
Claims30
A method of controlling a track seek servo in a Hard Disk Drive (HDD), comprising:
- generating a transformed Proximate-Time Optimal Servo (PTOS) velocity trajectory having symmetrical acceleration and deceleration durations during a track seek mode;
- and,
- applying the transformed Proximate-Time Optimal Servo (PTOS) velocity trajectory to control the movement of a read/write head from a current track to a target track.
An apparatus for controlling a track seek servo in a Hard Disk Drive (HDD), comprising:
- a seek trajectory generator adapted to generate a transformed Proximate-Time Optimal Servo (PTOS) velocity trajectory V_profile having symmetrical acceleration and deceleration durations in a track seek mode, and further adapted to calculate a designated position value and velocity value using the transformed PTOS velocity trajectory;
- a state estimator adapted to determine a real position value and a real velocity value for a read/write head moving over the surface of a disk in the HDD;
- a first subtracter adapted to output a value obtained by subtracting the real position value from the designed position value;
- a position control gain compensator adapted to generate a position compensation value by multiplying the output value of the first subtracter by a predetermined position gain;
- a second subtracter adapted to output a value obtained by subtracting the real velocity value from a value obtained by adding the position compensation value to the designed velocity value;
- a velocity control gain compensator adapted to generate a velocity compensation value by multiplying the output value of the second subtracter by a predetermined velocity gain;
- and
- an actuator adapted to vary drive current supplied to a voice coil in the HDD in accordance with the velocity compensation value.
A disk drive comprising:
- a disk adapted to store data;
- a spindle motor rotating the disk;
- a read/write head adapted to read data from and/or write data to the disk;
- an actuator adapted to move the transducer over the surface of the disk;
- and
- a controller adapted to control movement of the read/write head from a current track to a target track in relation to a transformed Proximate-Time Optimal Servo (PTOS) velocity trajectory having symmetrical acceleration and deceleration durations in a track seek mode.
Recording medium storing code segments executable on a controller to implement a method of controlling a track seek servo in a Hard Disk Drive (HDD), the method comprising:
- generating a transformed Proximate-Time Optimal Servo (PTOS) velocity trajectory having symmetrical acceleration and deceleration durations during a track seek mode;
- and,
- applying the transformed Proximate-Time Optimal Servo (PTOS) velocity trajectory to control the movement of a read/write head from a current track to a target track.
Dependencies are inferred from the claim text.