Enhanced settling control in hard disk drive
AssigneeMaxtor Corporation
InventorMan F. Cheung
Life of this patent
Estimating the term…
Abstract
A method for improving servo seek settling performance by selectively activating a gain enhancement control signal during settling. As an actuator approaches a target location, absolute position and velocity of the read/write transducer head are monitored. If the absolute position changes absolute values (positive to negative or vice-versa) or the velocity approaches zero, the gain enhancement control signal is activated and combined with a nominal actuator control signal to further urge the actuator towards the target location. The gain enhancement control signal decays exponentially so as not to excite mechanical resonance of the actuator arms.
Claims47
A method for reducing servo seek settling time in a disk drive apparatus, including an actuator for positioning a read/write transducer head at an initial location and a target location defined on a rotating disk, the method comprising the steps of:
- moving the read/write transducer head from the initial location toward the target location with the actuator;
- monitoring an absolute position value of the read/write transducer head prior to the read/write transducer head stabilizing at the target location, the absolute position value being defined by either a positive value or a negative value;
- selectively activating a gain enhancement control signal when the absolute position value changes between the values;
- and
- combining the gain enhancement control signal with a closed loop control signal to further move the read/write transducer head toward the target location, prior to the read/write head stabilizing on the target location.
A method for reducing servo seek settling time in a disk drive apparatus, including an actuator for positioning a read/write transducer head at an initial location and a target location defined on a rotating disk, the method comprising the steps of:
- moving the read/write transducer head from the initial location toward the target location with the actuator;
- monitoring an absolute position value of the read/write transducer head prior to the read/write transducer head stabilizing at the target location, the absolute position value being defined by either a positive value or a negative value;
- monitoring a velocity of the read/write transducer head prior to the read/write transducer head stabilizing at the target location;
- selectively activating a gain enhancement control signal that dissipates exponentially, prior to the read/write transducer head stabilizing at the target location;
- and
- combining the gain enhancement control signal with a closed loop control signal to further move the read/write transducer head toward the target location, prior to the read/write head stabilizing on the target location.
A method for reducing servo seek settling time in a disk drive apparatus, including an actuator for positioning a read/write transducer head at an initial location and a target location defined on a rotating disk, the method comprising the steps of:
- moving the read/write transducer head from the initial location toward the target location with the actuator;
- selectively activating a gain enhancement control signal that dissipates exponentially, prior to the read/write transducer head stabilizing at the target location;
- and
- combining the gain enhancement control signal with a closed loop control signal to further move the read/write transducer head toward the target location, prior to the read/write head stabilizing on the target location.
A disk drive comprising:
- a rotatable disk, including an initial track and a target track defined thereon;
- a read/write transducer head positioned proximate the rotatable disk;
- an actuator assembly that positions the read/write transducer head between an initial location on the initial track and a target location on the target track;
- and
- a controller that (i) actuates the actuator assembly to move the read/write transducer head from the initial location toward the target location, (ii) monitors an absolute position value of the read/write transducer head, the absolute position value being defined by either a positive value or a negative value, and (iii) selectively activates a gain enhancement signal when the absolute position value changes between the values to further move the actuator to position the read/write transducer head toward the target location, prior to the read/write transducer head stabilizing on the target location.
A disk drive comprising:
- a rotatable disk, including an initial track and a target track defined thereon;
- a read/write transducer head positioned proximate the rotatable disk;
- an actuator assembly for moving the read/write transducer head between an initial location on the initial track and a target location on the target track;
- and
- a controller for selectively activating a gain enhancement signal that dissipates exponentially to further move the actuator to position the read/write transducer head toward the target location, prior to the read/write transducer head stabilizing on the target location.
A disk drive comprising:
- a rotatable disk, including an initial track and a target track defined thereon;
- a
- read/write transducer head positioned proximate the rotatable disk;
- an actuator assembly that positions the read/write transducer head to near an initial location on the initial track and a target location on the target track;
- and
- a controller that (i) actuates the actuator assembly to move the read/write transducer head from the initial location toward the target location, (ii) monitors a velocity of the read/write transducer head as the actuator assembly travels toward the target location, and (iii) activates a gain enhancement signal when the velocity of the read/write transducer head approaches zero, the gain enhancement signal dissipating exponentially, prior to the read/write transducer head stabilizing on the target location.
A method for reducing servo seek settling time in a disk drive apparatus, including an actuator that positions a read/write transducer head at an initial location and stabilizes the read/write transducer head on a target location defined on a rotating disk, the method comprising the steps of:
- urging the read/write transducer head from the initial location to the target location with the actuator;
- monitoring an absolute position value of the read/write transducer head prior to the read/write transducer head stabilizing at the target location, the absolute position value being defined by either a positive or a negative value;
- monitoring a velocity of the read/write transducer head prior to the read/write transducer head stabilizing at the target location;
- selectively activating a gain enhancement control signal when the absolute position value changes between the values prior to the read/write transducer head stabilizing at the target location;
- and
- combining the gain enhancement control signal with a closed loop control signal to further urge the read/write transducer head toward the target location prior to the read/write transducer head stabilizing at the target location.
A servo seek routine for a disk drive, the servo seek routine comprising the steps of:
- urging a read/write transducer head from an initial location to a target location with an actuator;
- monitoring an absolute position value of the read/write transducer head, the absolute position value of the read/write transducer head being defined by either a positive or a negative value, prior to the read/write transducer head stabilizing at the target location;
- monitoring a velocity of the read/write transducer head prior to the read/write transducer head stabilizing at the target location;
- selectively activating a gain enhancement control signal when the absolute position value changes between the values prior to the read/write transducer head stabilizing at the target location;
- combining the gain enhancement control signal with a closed loop control signal to further urge the read/write transducer head toward the target location prior to the read/write transducer head stabilizing at the target location;
- and
- entering a track following mode when the read/write transducer head stabilizes on the target location.
A method for reducing servo seek settling time in a disk drive apparatus, including an actuator for urging a read/write transducer head toward a target location defined on a disk, the method comprising the steps of:
- moving the read/write transducer head toward the target location, with the actuator;
- and
- selectively activating a gain enhancement control signal during movement of the read/write transducer head toward the target location, the gain enhancement control signal dissipating logarthmically.
A disk drive comprising:
- a disk having a target location defined thereon;
- a read/write transducer head positioned proximate the disk;
- an actuator assembly that moves the read/write transducer head toward the target location;
- and
- a controller that selectively activates a gain enhancement control signal during movement of the read/Write transducer head toward the target location, the gain enhancement control signal dissipating logarithmically.
A disk drive comprising:
- a disk having a target track defined thereon;
- a read/write transducer head positioned proximate the disk;
- an actuator assembly that moves the read/write transducer head toward the target track;
- and
- a controller that (i) monitors a velocity of the read/write transducer head to determine when the velocity is approaching zero, and (ii) selectively activates a gain enhancement control signal upon a determination that the velocity of the read/write transducer head is approaching zero.
A method for reducing servo seek settling time in a disk drive including a storage disk having a target location, the method comprising the steps of:
- moving a read/write transducer head toward the target location;
- determining when a velocity of the read/write transducer head is approaching zero as the read/write transducer head moves toward the target location;
- and
- activating a gain enhancement control signal upon a determination that the velocity of the read/write transducer head is approaching zero, the gain enhancement control signal being used to further move the read/write transducer head toward the target location.
The method of claim further comprising the step of dissipating the gain enhancement control signal logarithmically.
A method for reducing servo seek settling time in a disk drive apparatus, including an actuator for positioning a read/write transducer head at an initial location and a target location defined on a rotating disk, the method comprising the steps of:
- urging the actuator and the read/write transducer head from the initial location to the target location;
- monitoring an absolute position value of the read/write transducer head as the read/write transducer head approaches the target location;
- monitoring a velocity of the read/write transducer head as the read/write transducer head approaches the target location;
- selectively activating a gain enhancement control signal when the absolute position value changes from a negative to a positive value;
- and
- combining the gain enhancement control signal with a closed loop control signal to further urge the read/write transducer head toward the target location.
A method for reducing servo seek settling time in a disk drive apparatus, including an actuator for positioning a read/write transducer head at an initial location and a target location defined on a rotating disk, the method comprising the steps of:
- urging the actuator and the read/write transducer head from the initial location to the target location;
- monitoring an absolute position value of the read/write transducer head as the read/write transducer head approaches the target location;
- monitoring a velocity of the read/write transducer head as the read/write transducer head approaches the target location;
- selectively activating a gain enhancement control signal, the gain enhancement control signal dissipating exponentially;
- and
- combining the gain enhancement control signal with a closed loop control signal to further urge the read/write transducer head toward the target location.
A servo seek routine for a disk drive, the servo seek routine comprising the steps of:
- urging the actuator and the read/write transducer head from the initial location to the target location;
- monitoring an absolute position value of the read/write transducer head as the read/write transducer head approaches the target location;
- monitoring a velocity of the read/write transducer head as the read/write transducer head approaches the target location.
- selectively activating a gain enhancement control signal when the absolute position value changes from a positive to a negative value;
- combining the gain enhancement control signal with a closed loop control signal to further urge the read/write transducer head toward the target location;
- and
- entering a track following mode when the read/write transducer head reaches the target location.
A disk drive comprising:
- a rotatable disk, including an initial track and a target track defined thereon;
- a data transducer positioned proximate the rotatable disk;
- an actuator assembly for positioning the data transducer to proximate an initial location on the initial track and a target location on the target track;
- and
- a controller for actuating the actuator assembly from the initial location towards the target location and selectively activating a gain enhancement signal to further urge the actuator to position the data transducer towards the target location, the gain enhancement signal dissipates exponentially.
Dependencies are inferred from the claim text.