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| Number | Title | Issue Date |
| 7957090 | Seek control apparatus and method for generating control data for seek control There is provided a method for generating acceleration data used in feed-forward control of head seeking, wherein, a seek distance and one of a seek period and the count of samples are received; a weighting factor for the change rate of acceleration between adjacent... | 06/07/2011 |
| 7660070 | Quiet high performance seek procedure for disk drives a seek procedure for a hard disk drive which provides a significant reduction in acoustic noise as well as high performance fast seek times is described. The seek procedure lowers the peak acceleration for short seeks and imparts a smooth transition from a sine seek... | 02/09/2010 |
| 7619849 | Magnetic disk drive with controlled transducer movement during a seek Embodiments in accordance with the present invention provide a magnetic disk drive with reduced noise during seek operation without causing any delay in control response. According to one embodiment of the present invention, a control circuit of a magnetic disk driv... | 11/17/2009 |
| 7602581 | Interpolated just-in-time seek trajectories Methods and apparatus of the present invention allow for interpolated Just in Time (iJIT) seek command control of hard drive actuators. ... | 10/13/2009 |
| 7515376 | Disk drive with variable track density A method of manufacturing a disk drive is disclosed in which servo information is written in tracks on a disk surface, the track width performance of the associated read/write transducer is measured, the track width performance is analyzed and a data track pitch is ... | 04/07/2009 |
| 7515375 | Positioning control device and disk device The present invention provides a positioning control device and a disk device for shortening a calculation delay time. Upon detection of a position signal from a demodulation circuit, an MCU of the disk device calculates a position error, and following calculation o... | 04/07/2009 |
| 7420764 | 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 calculation of the next control, making computation time delay no long... | 09/02/2008 |
| 7388726 | Dynamically adjustable head disk spacing slider using thermal expansion A disk drive includes a slider assembly and a controller that directs current to the slider assembly to dynamically adjust the head-to-disk spacing. In one embodiment, the slider assembly includes a write element having a first end, a second end and an intermediate ... | 06/17/2008 |
| 7372660 | Disc storage system with adaptive PID control A disc drive controller circuit for an actuator receives reference data indicating a desired actuator position “θd”, error data indicating a difference “e” between the desired actuator position and a sensed actuator position “θ”, and adaptiv... | 05/13/2008 |
| 7369369 | Bidirectional micropositioning recording head for a magnetic storage device A recording head for use in magnetic storage devices is disclosed. The recording head includes a transducer that is bi-directionally movable with respect to a magnetic medium surface of the magnetic storage medium, thereby enabling improved positioning of the transd... | 05/06/2008 |
| 7369352 | Apparatus, medium, and method with seek servo control considering temperature change An apparatus, medium, and method to control a disk drive, and in particular, an apparatus, medium, and method controlling a disk drive to perform a seek mode at an optimum state with respect to an operational temperature. A seek servo control method considering temp... | 05/06/2008 |
| 7362538 | Torque constant correction method in multiple sinusoidal seek servo and disk drive using the same A disk drive control method and apparatus. In particular, a torque constant correction method and apparatus in a disk drive using a multiple sinusoidal seek servo scheme. The torque constant correction method includes: performing a test seek routine for torque const... | 04/22/2008 |
| 7359141 | Servo control method, apparatus using the same, and recording medium having program for executing the method The sequential seek method includes calculating a seek length by comparing a cylinder number of a current track with a cylinder number of a target track; checking if the seek length corresponding to a cylinder number is equal to or smaller than 2; calculating a seek... | 04/15/2008 |
| 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 noise of the disc drive while shortening track-seek time. In the metho... | 04/15/2008 |
| 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) control plant output signal, generating an actuator voice coil motor (... | 03/25/2008 |
| 7342739 | Method, medium, and apparatus compensating for torque variations based on temperature A method, medium, and apparatus controlling a hard disk drive, and particularly, embodiments include methods, media, and apparatuses compensating for torque variations with respect to temperature variations in a seek servo operation, compensating for differences bet... | 03/11/2008 |
| 7342741 | Disk drive with variable track density A method of manufacturing a disk drive is disclosed in which servo information is written in tracks on a disk surface, the track width performance of the associated read/write transducer is measured, the track width performance is analyzed and a data track pitch is ... | 03/11/2008 |
| 7333292 | Seek servo control method for adapting to supply voltage variation and disk drive using the same A seek servo control method and device for a disk drive device for performing seek servo control according to a variation in a power supply voltage for the disk drive. The seek servo control method includes: detecting a supply voltage for the disk drive; and adjusti... | 02/19/2008 |
| 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 determining a difference between a command current and the sense current... | 02/05/2008 |
| 7328118 | Method of determining the mass unbalance of an actuator The present invention is a method of determining mass unbalance of an actuator mechanism in a system. The method includes calculating a center of gravity in first x and y components with respect to a first coordinate system of the actuator mechanism. The method also... | 02/05/2008 |
| 7324299 | Disk drive that positions a head at multiple head-to-disk spacings A disk drive having a drive housing, a storage disk that is rotatably coupled to the drive housing, and a slider assembly that includes a head and a slider mover. The head reads data from the storage disk during a read operation and writes data to the storage disk d... | 01/29/2008 |
| 7312592 | Adaptive system for optimizing excitation current waveform profiles for electric motors An adaptive control system for an electric motor has energization circuitry connected to phase windings of the motor for energization thereof and a controller for generating a control signal corresponding to a profile of an excitation current. The control signal is ... | 12/25/2007 |
| 7310195 | System and method for adjusting head-to-disk spacing in a disk drive A disk drive includes a drive housing, a storage disk, a slider and a drive circuitry. The storage disk has an inner and an outer diameter. The slider includes a read/write head and a slider mover that receives power from the drive circuitry to position the read/wri... | 12/18/2007 |
| 7295396 | Magnetic disk drive Embodiments of the present invention reduce noise and residual vibration during random access operation of a magnetic disk drive. The magnetic disk drive which executes each instruction from an upper device to move a magnetic head from a start track to an end track ... | 11/13/2007 |
| 7295397 | Feedforward controller and methods for use therewith A controller includes a combining module that generates a total control signal for the drive device of a disk drive by combining a feedback control signal and a feedforward control signal. A feedback control module generates the feedback control signal in response t... | 11/13/2007 |
| 7289291 | Disk drives and methods allowing for super silent seeks A disk drive includes a disk, a head, an actuator, and a servo controller. The servo controller controls a movement of the actuator based on a super silent seek profile to cause the actuator to perform a super silent seek in which an acoustic output due to the movem... | 10/30/2007 |
| 7289290 | Method of controlling track seek servo in disk drive and apparatus therefor A method of controlling a track seek servo in a hard disk drive and an apparatus therefor. A method of controlling a track seek servo includes moving a transducer to a track with an acceleration trajectory generated by a convolution operation, a rate of change of ac... | 10/30/2007 |
| 7280899 | S-type smooth command generating method and means thereof An S-type smooth command generating method and the means thereof are provided to process the motion commands smoothly, thereby generating continuous velocity commands and position commands. The provided method not only improves the motor's ability of acceleration/de... | 10/09/2007 |
| 7271972 | Method and apparatus for reducing seek acoustics using a variable-bandwidth low-pass filter A method and apparatus for reducing seek acoustics in a disk drive using a variable-bandwidth low-pass filter is provided. The variable-bandwidth low-pass filter is used to adaptively shape a control signal supplied to a VCM for moving a head relative to a disk surf... | 09/18/2007 |
| 7259933 | Velocity control system for an actuator assembly A method for generating a velocity command for an actuator assembly is provided. The actuator assembly includes an actuator arm, which is to move over a plurality of surfaces. The method begins by providing a compensation torque for each of the plurality of surfaces... | 08/21/2007 |
| 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 compensates for a gain distortion and a phase delay caused by a notch filte... | 07/24/2007 |
| 7248442 | Integrated recording head micropositioner using off-axis flexure bending A recording head for use in magnetic storage devices is disclosed. The recording head includes a transducer that is bi-directionally movable with respect to a magnetic medium surface of the magnetic storage medium, thereby enabling improved positioning of the transd... | 07/24/2007 |
| 7218471 | Self-servo writing using recording head micropositioner Servo tracks are written onto different disk surfaces using multiple recording heads within a disk drive without requiring a servo writing machine or clean room conditions. Microactuators in the reference heads in the disk drive are capable of independent motion wit... | 05/15/2007 |
| 7215503 | Time linear arrival for velocity mode seeks A method, computer program product, and apparatus for controlling the arrival of a disc drive actuator arm assembly using a time-linear arrival profile are disclosed. A reference velocity is calculated as a function of the current position of the arm assembly and th... | 05/08/2007 |
| 7209219 | System for controlling a position of a mass A control system for controlling a position of a mass, such as, for example, a substrate holder in a lithographic apparatus, is presented herein. The control system comprises a first input to receive a desired position of the mass, a second input signal to receive a... | 04/24/2007 |
| 7208898 | Near time-optimal jerk trajectory for positioning a control object Method and apparatus for control object manipulation from an initial position to a final position. A jerk control profile describes a near time-optimal jerk trajectory for the control object and includes a sequence of first, second and third sinusoidal pulses of res... | 04/24/2007 |
| 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 settling servo control method and apparatus for disc drives, which allow a ... | 04/10/2007 |
| 7199981 | High reliability-parallel data transfer hard disk drive A dual actuator arm assembly system that uses two pairs of actuator-carriage arms that linearly move over a stationary micro-rail independently. The geometric shape of the two pairs of actuator carriage arms conform to the arcs of the data tracks at an acute angle. ... | 04/03/2007 |
| 7164250 | Open-loop voltage driving of a DC motor The driving voltage of the motor is incremented a quantity proportional to the speed of the motor according to a proportionality factor that is adjusted to compensate the back electromotive force. A method includes open-loop voltage control of a DC motor having a ce... | 01/16/2007 |
| 7164635 | Method of estimation parameter adaptability adjustment of an optical storage device A method of estimation parameter adaptability adjustment of an optical storage device. The method determines an estimation parameter according to a current data recording location of the optical storage device to estimate a channel bit rate. The method includes prov... | 01/16/2007 |
