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7379262 Higher-order state estimator for low TMR in hard disk drives  
A hard disk drive with a servo circuit that provides a control signal to a voice coil motor to perform a servo to align a head with a disk track of the drive. The servo circuit includes a fifth...
7372660 Disc storage system with adaptive PID control  
A disc drive controller circuit for an actuator receives reference data indicating a desired actuator position “θ d ”, error data indicating a difference “e” between the desired actuator...
7372658 Correction table creation method for head position control, head position control method and disk device  
A head position control system controls the position of the head by correcting the components synchronizing rotation of the disk from the head control amount, in which an adjusted gain to minimize...
7359140 Method and apparatus of acceleration-based track seeking servo control of disk drive  
A method and apparatus directed to acceleration-based track-seeking servo control of a disk drive, which minimize jerk generated at the start and end of track seeking, thereby reducing mechanical...
7349174 Soft sensor for operating shock in a disc drive  
A method of preventing a write operation to a disc in a disc drive during a shock event without the use of a separate shock sensor comprises steps of monitoring an actuator voice coil motor (VCM)...
7349173 Self-tuning settle controller in hard disk drives  
A hard disk drive with a voice coil motor controlled by a circuit. The circuit provides a driving current to the voice coil motor to move a head of the drive in a seek routine. The seek routine...
7330331 Repeatable runout estimation in a noisy position error signal environment  
A system and method for estimating repeatable runout in a servo control system, such as a disc drive servo loop, is provided. The system includes a Kalman filter that is configured to receive...
7327103 Driver and method for control of voice coil motor in disk drive  
A driver for a voice coil motor in a disk drive includes a sensor that provides a sense current by sensing a coil current in the voice coil motor, a comparator that provides an error current by...
7315433 Non-repeatable run out compensating apparatus and method and disc drive using the same  
An apparatus and method are provided for quickly and finely compensating for non-repeatable run out (NPRO) of a disc drive. The NPRO compensation control apparatus in a run out compensation...
7307810 Method of compensating for track address discontinuity across servo track writing boundary in hard disk drives  
A hard disk drive with a circuit that provides a current to a voice coil motor to move a head over a disk in a seek routine. The disk has track boundaries with discontinuities in track addresses....
7304751 Apparatus and method for automatically measuring characteristics of a hard disk drive carriage arm  
An apparatus and method for automatically measuring characteristics of a hard disk drive carriage arm. The method provides a first measuring device for automatically measuring a first side of a...
7286318 Optimization of position mode seeking of a disk drive head based on measured open loop actuator response  
A disk drive and related methods are provided for tuning the control of an actuator for position mode seeking of a head between tracks on a disk based on a measured open loop response of the...
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...
7248429 Adaptive settling control method and apparatus in track seek mode of disc drive  
A settling control method and apparatus perform an improved settling control regardless of a seek distance when a disc drive track seek control operation is performed. An adaptive settling control...
7248428 Method, medium, and apparatus controlling track seek in a recording and/or reproducing apparatus  
A method, medium, and apparatus controlling a hard disk drive, and more particularly, a method, medium, and apparatus controlling a track seek of a hard disk drive, where the hard disk drive...
7206162 Seek trajectory generation using adaptive filtering  
Embodiments of the present invention provide a method and a system for generating optimal feedforward signal for the seek control to suppress the RTV (Random Transient Vibrations) and the seek...
7203028 Settling servo control method and apparatus for hard disc drive and method and apparatus for estimating acceleration constant of voice coil motor actuator suitable for the settling servo control method and apparatus  
A fast settling servo control method and apparatus for a hard disc drive and a method and apparatus estimate an acceleration coefficient of a voice coil motor (VCM) actuator suitable for the...
7161761 Magnetic disk drive with feedback control  
A feedforward control system using a polynomial formula not affected by discretization error is realized in a magnetic disk drive. In one embodiment, the magnetic disk drive is intended to move a...
7149048 Method and apparatus for improving spiral-based position correction system stability via kernel frequency component modification  
The present invention is directed to a method and apparatus for improving spiral-based position correction system stability via kernel frequency component modification. In one embodiment, a disk...
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...
7136256 Head positioning control method for a storage device and head positioning control device  
A head positioning method and device positions a head which reads a disk-type storage medium at a specified location, and accurately estimates a bias value during settling control. A disk device...
7085096 Method of generating current trajectory for seek control of hard disc drive and seek control system using the same  
Provided are a method of generating a current trajectory for seek control of a hard disc drive and a seek control system using the same, the method including setting a current trajectory from...
7046478 Method and apparatus for reducing vibration in a dynamic system  
An apparatus and method for controlling a dynamic system is provided in which primary position control output signals are generated at a position measurement sampling frequency. Intermediate...
7035042 Fast positioning of disk drives and other physical systems  
A method useful to change a system's output from one value to another within a prescribed time-interval in an optimal manner using optimization criteria such as minimal time (e.g., to increase...
7031101 Methods, apparatus and computer program products for controlling seeking of a transducer based on phase dependent state error  
A transducer is controlled during seeking based on an acceleration-phase state error. While seeking, the transducer is moved from an initial track to a target track on the disk based on a current...
7031095 Servo controller method and apparatus for high tracks per inch hard disk drives using a delay accomodating state estimator  
The invention applies to servo controllers for at least the voice coil motor of a hard disk drive. Today, many control algorithms require 80 to 90 percent of the sampling period to complete their...
6999909 Process for designing an optimal vibration isolation mount for a disc drive  
An optimal vibration mount for a disc drive is designed by computing external, Ξ, and internal, Θ, disturbance models for the disc drive and defining an inertia matrix, M, for the disc drive. A...
6999263 Method and apparatus for self servowriting of tracks of a disk drive using a servo control loop having a two-dimensional weighted digital state compensator  
A method is disclosed for defining tracks on a rotating magnetic disk medium of a disk drive. Reference tracks are followed using a servo control loop while writing servo burst patterns defining a...
6995946 Temperature compensation of seek profiles in data storage devices  
Methods relating to compensating a pre-defined seek profile for use in a data storage device, such as a disc drive, to manage the internal temperature of the device are disclosed. One embodiment...
6995945 Head positioning system, disk drive apparatus using the same, and head positioning method  
A head positioning system includes: a positioning mechanism section 1 for positioning a head 12 ; a position controller 2 for detecting a head position signal x to output a position control...
6987639 Disk drive modifying a rotational position optimization algorithm based on motor capability of a VCM  
A disk drive is disclosed comprising a disk, a head, and a voice coil motor (VCM) for actuating the head over the disk. The disk drive executes a rotational position optimization (RPO) algorithm to...
6970321 Automatic model regulation in a disc drive servo system using model reference inverse  
An equalization filter for counteracting the effects of unwanted resonance modes and noise in the VCM plant. The filter comprises a transfer function derived from a function of the actual VCM plant...
6961205 Magnetic disk apparatus  
A seek controller corresponds to a velocity control system which produces a target value based upon a target track, a present position, and a remaining distance from a commencement of a seek...
6950271 Disk drive and disk drive control method  
A position detector generates a position error signal corresponding to a current position of a head, a position controller generates a position control signal from the position error signal, a...
6947852 Monitoring and correcting for non-translational motion in a resonance measurement apparatus  
A system and method for assessing and potentially correcting for non-translational motion in a resonance measurement apparatus is provided. The design measures the response of an article, such as...
6947233 Disk drive apparatus and method for compensating for error in servo-information-recorded position between heads  
In a first mode, an R/W channel starts to monitor read information to thereby detect a servo mark contained in servo information, each time a servo controller generates a servo gate pulse. Upon...
6937430 Robust triple-mode compensator for hard disk drives with dynamic friction  
Friction existing between any two surfaces having relative motion is nonlinear, multiform, and is difficult to model. Nonlinear friction in the actuator pivot of a hard disk drive (HDD) limits the...
6898039 Positioning control device for two-stage actuator  
In a positioning control device for a two-stage actuator having a coarse-movement actuator and a fine-movement actuator, a notch filter having a cutoff frequency fn is provided to a coarse-movement...
6873490 Control object positioning using jerk, current and time optimized control profiles  
Method and apparatus for moving a control object, such as a data transducing head in a data storage device, from an initial position to a destination position. A base generation term describes a...
6870342 Cosine bang-bang seek control for a voice coil of a disc drive  
A method and apparatus for improving the timing of a seek operation through the removal of the coast phase of conventional model reference waveform type control systems are provided. With the...
6847598 Servo with digital filter to control gain in a frequency band where open loop characteristic is higher than the phase cross-over frequency and lower than resonance frequency  
The present invention implements a servo system which can support changes of the higher resonance frequencies of the actuator with a simple configuration at low cost. The servo system comprises a...
6847503 Repeatable runout compensation in a disc drive  
A system and method for correcting repeatable runout errors during manufacture of a disc drive. The system includes a Kalman filter having a recursive learning gain input and includes a recursive...
6839194 Disk drive apparatus and method for generating servo sector pulse  
A servo mark detector detects a servo mark from each servo information item detected by the servo detector. A counter measures a time period each time a servo mark is detected, thereby measuring a...
6831809 Rotary recording apparatus and method of controlling the apparatus  
A control arrangement having a feedforward system and a feedback system, a control model for generating reference position data from a feedforward control signal is separated into an original...
6826002 Measuring apparatus and measuring method for measuring performance characteristics of recording unit including circular recording medium  
A measuring apparatus and a method is provided for measuring performance characteristics of a recording unit including a circular recording medium on which one track is divided into a plurality of...
6813227 Apparatus and method to compensate for disturbance using learning control in an optical recording/reproducing apparatus and optical recording medium drive servo system  
A disturbance compensation module using learning control generates a control input to compensate for track position errors due to a periodic disturbance occurring in an optical recording medium in...
6798611 Disk storage system employing a discrete-time sliding mode controller for servo control  
A discrete-time sliding mode controller (SMC) controls the motion of a read head actuated over a disk storage medium during tracking operations. The discret-time SMC comprises a linear signal...
6791785 Disk drive with efficient coil temperature estimation  
A controller for a disk drive that accesses a look up table having a plurality of thermally characterized values corresponding to a plurality of seek operations. For each seek operation, the...
6785075 Self-writing servo and clock fields on a recording medium  
A disc drive with an information portion previously written on a rotatable disc surface, a servo write clock generator phase lock loop circuit controlling timing for writing a reference mark to the...
6751045 Compensation for repeatable run-out error  
A method and apparatus for compensating for repeatable run-out errors in a disc drive is disclosed. The compensation is created by determining transfer function values for a servo loop in the drive...
Matches 1 - 50 out of 236 1 2 3 4 5 >