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7385780 |
Online identification of secondary actuator transfer function via system decoupling in multiple-stage actuator servo systems in disk drives
A hard disk drive that includes a voice coil motor and a micro-actuator. The micro-actuator is controlled by a servo that utilizes a micro-actuator controller and a corresponding micro-actuator...
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7342740 |
In-situ compensation method of microactuator stroke sensitivity subject to temperature variation
A hard disk drive that includes a voice coil motor and a micro-actuator. The micro-actuator is controlled by a servo that utilizes a micro-actuator calibration parameter. To compensate for...
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7312945 |
Techniques for adjusting for actuator non-linearities in a data storage system
The invention provides techniques for adjusting for actuator non-linearities in a data storage system. The invention is particularly useful for piezoelectric actuators, such as actuators that...
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7283321 |
Disk drives and methods allowing for dual stage actuator adaptive seek control and microactuator gain calibration
A disk drive includes a disk, a head, a coarse actuator, a microactuator, and a servo controller. The microactuator positions the head relative to the disk. The coarse actuator positions the...
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7265936 |
Algorithm for DSA/microactuator total loop gain calibration
A hard disk drive that includes a voice coil motor and a micro-actuator. The disk drive includes a servo with a voice coil motor loop, a micro-actuator loop and an overall loop. The servo is...
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7250738 |
Nonlinear hysteresis control system
A nonlinear hysteresis control system for controlling an actuator with nonlinear hysteresis effect is disclosed. An improved extended hysteresis effect profile further stores the displacement when...
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7173790 |
Magnetic disk apparatus with dual stage actuator
In one embodiment, a magnetic disk apparatus comprises a magnetic disk for recording information; a magnetic head that reads information from, or writes information to, the magnetic disk; an...
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7164552 |
Method for self-servo writing a disk drive with dual-stage actuator
A technique for setting the initial servo track pitch for a servo system of a hard disk drive (HDD) is based on using a secondary actuator, such as a microactuator or a milliactuator. The actuator...
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7154702 |
Head actuator
Disclosed herein is a head actuator for a head provided so as to accessible to a disk-shaped recording medium rotating above a base. The head actuator includes a main actuator driven so as to...
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7145745 |
Multi-stage actuator disk drives, methods, and computer program products that compensate for repeatable runout based on estimated secondary actuator position
Methods of compensating for repeatable runout in a disk drive are provided. The disk drive includes a data storage disk, a transducer adjacent to the disk, a primary actuator for positioning the...
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7136257 |
Apparatus and method for maintaining stability in a disc drive servo loop
An apparatus and method of maintaining stability in a servo loop of a disc drive is provided. A dither signal (a single frequency sine wave or a multi-frequency signal) is injected into the servo...
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7126785 |
Multi-stage actuator disk drives, methods, and computer program products for seeking and then maintaining a transducer on track
Disk drives, methods, and computer program products are provided for controlling seeking of a transducer that is adjacent to a rotatable data storage disk in a disk drive. The disk drive includes a...
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7126780 |
Method, system, and article of manufacture for self-servowriting a disk
A compound actuator self-servo writes a hard disk. The compound actuator moves to track n+1. A first head on the compound actuator track follows on track n. The other heads servo write on track...
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7116510 |
Servo self-write disk drive with dual-stage actuator
A hard disk drive (HDD) uses a technique for setting the initial servo track pitch for a servo system by using a secondary actuator, such as a microactuator or a milliactuator. The actuator of the...
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7106552 |
Method for secondary-actuator failure detection and recovery in a dual-stage actuator disk drive
A method for secondary-actuator failure-detection and recovery in a dual-stage actuator disk drive includes running a calibration test by the servo control processor and measuring the position of...
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7075748 |
Disk drive with a dual-stage actuator and failure detection and recovery system for the secondary actuator
A dual-stage actuator disk drive has calibration tracks located in a nondata band, and uses a secondary-actuator failure detection and calibration test run by the servo control processor. The...
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7038886 |
Positioner for precisely moving an E-block of a disk drive
A positioner ( 20 ) for a disk drive ( 10 ) that includes a magnet assembly ( 52 ), a conductor assembly ( 54 ), and a control system ( 22 ) is provided herein. The magnet assembly ( 52 ) includes...
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7038877 |
Head positioning apparatus
A head positioning apparatus capable of positioning a head at high speed and with high accuracy is provided. The head positioning apparatus includes a magnetic head, a head supporting mechanism, a...
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7038876 |
Control system for a data storage device with constraint
A control system for a data storage device including a constraint or weight to control stroke utilization and/or closed loop response of the control system. In particular, in one embodiment...
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7035041 |
Displacement resetting systems and methods for the second stage of a hard disk drive dual-stage actuator
A control system and method for a disk drive comprising first and second actuator arms. The control system comprises first and second stages and a reset system. The first stage displaces the first...
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7031099 |
Head positioner and information recording/replaying apparatus
A head positioner has a configuration employing a dual-stage actuator method, wherein positioning control is performed for a write/read according to cooperative operations of a coarse actuator and...
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7019938 |
Head positioning method, and disk apparatus using the same
A first estimator 13 estimates the position of a head based on a VCM driving signal u 1 and a voltage signal Va output from a VCM 6 to output a first head position estimation signal x 1est ....
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7012780 |
Disk drive and methods that calibrate micro actuator positioning before seek operations
A disk drive includes a data storage disk, a transducer, a micro actuator, a coarse actuator, and a controller. The micro actuator is configured to position the transducer relative to the disk over...
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7009804 |
Method and apparatus for micro-actuator stroke sensitivity calibration in a hard disk drive
A sinusoidal signal is added to the notch filtered micro-actuator control signal stimulating the micro-actuator. The voice coil control signal is notch filtered to remove the frequency component of...
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7009799 |
Tiltable device, in particular hard disk actuator device, with roll and pitch angle active control
In an actuator device for hard disks a suspension element carries a slider that is subject to undesired vibrations which give rise to rotations of the slider with respect to a nominal position. An...
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6989949 |
Performance test method of head gimgal assembly with precise positioning actuator
A method of testing a performance of the HGA has a step of writing information from the at least one thin-film magnetic head element onto a magnetic disk with driving the actuator for displacement...
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6985327 |
Method and control scheme for compensating the coarse actuators undesired transients in dual stage control systems
A compensation element ( 317 ) in a feedforward line in a dual stage control system for a data storage system compensates for the undesired transient motion of a first positioning element (i.e., a...
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6977793 |
Magnetic recording disk drive with dual-stage actuator and control system with multiple controllers
A disk drive with a dual-stage actuator has a servo control system with two controllers. One controller is a dual-stage controller that simultaneously generates a primary actuator control signal...
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6975482 |
Settle control systems and methods for the second stage of a dual stage actuator
An actuator control system and method for a hard disk drive comprising first and second actuators that support a head relative to a disk is disclosed. The actuator control system comprises a first...
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6975481 |
Driver systems and methods for an actuator of a hard disk drive
A displacement system for a hard disk drive comprising a driving circuit and first and second displacement elements. The driving circuit generates a driving signal from a source voltage level, a...
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6975477 |
Micro actuator DC gain calibration scheme for HDD dual-stage actuator systems
A servo system for displacing a head relative to a disk of a hard disk drive. The servo system comprises a dual-stage actuator, a calibration signal generator, and a calibration factor generator....
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6972924 |
Disk drive attenuating excitation of arm vibration mode by simultaneously driving secondary actuator for non-active head
A disk drive is disclosed employing a primary actuator for rotating an actuator arm about a pivot in coarse movements, and first and second secondary actuators coupled to the actuator arm for...
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6934117 |
Technique to compensate for resonances and disturbances on primary actuator through use of a secondary actuator
A control system for an actuator arm assembly of a hard disk drive reduces the Non-Repeatable Run-out (NRRO) caused from external sources exciting higher-frequency actuator arm assembly modes. The...
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6922303 |
Reaction mass dual-stage actuator (DSA) and sensor
A hard disk drive that has a reaction mass and a transducer that can be used to move and/or sense the acceleration of an actuator arm of the drive. The transducer is coupled to a disk controller...
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6909571 |
Method and apparatus actively damping mechanical vibration and shock in head suspensions of a disk drive
The invention includes a method of attenuating resonance frequency modes in head suspensions, which does not significantly increase the weight of the head suspension. The invention provides a way...
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6888695 |
Information recording and reproducing apparatus having higher drive pulse frequency during seeking operation than during following operation
An information recording and reproducing apparatus having a high track density, a high recording density in each of the tracks, and a short seeking time. In a seeking operation, a control circuit...
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6883062 |
High-speed disk drive system
A high-speed disk drive system that features significant performance improvements over previously available systems. By immediately fetching the data as soon as heads reach the destination...
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6882494 |
Sensor system for disk device using floating head
A sensor system for a disk device by using a floating head, comprising a head element that floats over a data recording area of a rotating disk so as to write data thereon or read data therefrom, a...
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6873489 |
Method, system, and program for estimating coil resistance of a voice coil motor in a disk drive system
Provided are a method, system, and program for estimating coil resistance of a voice coil motor for an actuator assembly in a disk drive system. An estimation is made of a calibration coil...
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6833974 |
Head positioning device and disk drive using same
Vibration detector receives as an input a relative displacement signal corresponding to a displacement distance of fine actuator, and extracts only a high frequency component. Fine actuator is...
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6831807 |
Head positioner and disk drive using the same
A head positioner comprises a degradation detecting unit for detecting degradation of a fine motion actuator based on current flowing through a piezo element constituting the fine motion actuator...
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6829119 |
Disc drive microactuator with lateral position sensor
A read/write head microactuator includes first and second insulating deposits that are flat, spaced apart by an air gap, and laterally movable responsive to a microactuator electrical drive...
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6798610 |
Disk drive with self servo writing capability
The present invention is directed to utilizing the capabilities of multi-stage actuators in disk drives to do self servo writing on the disk surfaces, thereby avoiding the use of a servo track...
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6798609 |
Magnetic microactuator with capacitive position sensor
A disc drive system includes a recording disc rotatable about an axis, a slider supporting a transducing head for transducing data with the disc, and a dual-stage actuation assembly supporting the...
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6791786 |
Active damping of two-stage actuator system in a disc drive
An actuator control system for a two-stage actuator system of a disc drive has a first, or primary, stage actuator consisting of a voice coil motor that positions the head relative to a disc and a...
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6788490 |
Circuit for estimating the speed of an electromagnetic actuator
A circuit estimates speed of an electromagnetic actuator associated with a reading head of a disk storage unit and a digital controller. The circuit includes first and second supply terminals and...
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6785086 |
Transducer-level microactuator with dual-axis control
A slider for carrying and finely adjusting both a radial position and a flying height of a transducing head with respect to a track of a rotatable disc includes a stator portion carried by a...
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6778350 |
Feed forward control of voice coil motor induced microactuator disturbance
A method is used for moving a transducing head between tracks of a disc in a dual-stage actuation assembly. The dual-stage actuation assembly has a main actuator for coarse positioning of the...
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6765743 |
Micro-actuator transducer stack inertia cancellation control
A micro-actuator of a head suspension either is wired in a reverse polarity to effect movement of the suspension arms in opposing directions relative to the magnetic disks or reversed in physical...
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6751047 |
Stepped disc drive voice coil actuator acceleration for reducing resonance of head level micro-actuators
A disc drive having a voice coil actuator with an attached suspension and head, the head including a micro-actuator. The micro-actuator having at least one natural frequency and at least one...
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