Matches 51 - 100 out of 548 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
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...
7116513 Positioning transducers based on a compensation scheme that varies based on transducer vibrational state  
A disk drive includes a transducer and a rotatable disk, which includes a plurality of tracks. A vibration state of the transducer relative to the disk is determined. The transducer is positioned...
7106540 Ensuring rate of spin-up/spin-down cycles for spindle motor in a hard disk drive does not exceed rate spindle motor is designed to handle  
A method, computer program product and hard disk drive for restricting a rate of spin-up/spin-down cycles for a spindle motor in a hard disk drive. The firmware in the hard disk drive determines a...
7106537 Disk drive using a timer to arbitrate periodic serial communication with a power driver  
A disk drive is disclosed comprising a microprocessor and a power driver for generating at least one actuator signal applied to the VCM actuator, wherein a serial communication circuit is used to...
7102847 Identification of laterally positioned servo bands employing differentiating characteristics of servo patterns  
In a tape having separate servo bands of patterns positioned laterally across the tape, the patterns of a separate servo band have at least one differentiating characteristic with respect to...
7092197 Rejection of power supply variations for gain error cancellation in pulse-width-modulated motor controllers  
A positioning driver ( 32 ) for a voice coil motor ( 22 ) in a disk drive system ( 10 ) is disclosed. Pulse-width-modulated prestage drivers ( 46 ) are coupled to power transistors ( 50 ) arranged...
7088546 Method to reject disk drive disturbance  
Track mis-registration (TMR) correction is conditionally made in a hard disk drive using servo data in a closed loop servo control scheme, along with one or more alternative sensing schemes when an...
7088535 Off-track retry method in hard disk drive  
An off-track retry method for recovering data incorrectly read due to a read error caused by an off-track error in a disk drive. The off-track retry method includes extracting read gain...
7085084 Magnetic disk apparatus and servo pattern recording method therefor  
A magnetic disk apparatus and a servo pattern recording method therefor, enabling writing of servo signal with high quality, without being affected with ill influences due to fluctuation on a...
7082007 Method to achieve higher track density by allowing only one-sided track encroachment  
A disc drive includes a transducer having a separate element for writing information and a separate element for reading information to and from the disc. In a disc drive designated to read and...
7057843 Disk drive control circuit and method  
A servo control circuit provides seamless transition between seek and track modes while enabling both rapid seek mode operation and accurate tracking. The control circuit includes an...
7054094 Real-time automatic loop-shaping for a disc drive servo control system  
An apparatus and method for improving servo loop performance in a disc drive storage system are provided. The servo loop includes a voice coil motor actuator that moves the head in response to a...
7050257 Method for estimating the resistance of a DC motor for positioning read/write heads of a hard disk  
A method for estimating resistance of a DC motor for positioning read/write heads of a data storage disk is provided. The DC motor is controlled in an open-loop voltage mode through a motor...
7046476 Method apparatus and system for accessing discontinuous media tracks  
An apparatus, system, and method are disclosed for accessing discontinuous media tracks. The apparatus, in one embodiment, accesses discontinuous media tracks of a storage medium having one or more...
7042666 Disk drive having improved timing marks  
A disk drive has timing marks (TMs) on the disk, that are chosen to reduce the probability of misidentification of a TM in the presence of read errors. The disk drive searches for TMs within a...
7042664 Method and system for host programmable data storage device self-testing  
A method and system for providing programmable self-testing of a data storage device comprises selecting one or more host programmable tests stored in memory in the data storage device by setting...
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...
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...
7035037 Disc drive with compensation for non-repeatable runout  
An NRRO compensation circuit controls a head position in a disc drive. The circuit has a first frequency circuit providing a first output corresponding to NRRO and a first characteristic sensing...
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...
7023637 Disk drive having a disk including a servo burst pattern that improves the signal to noise ratio during track following for writing  
A disk drive has a sampled servo system controller and a disk. The disk has a plurality a plurality servo burst fields, the plurality of servo burst field including first and second normal burst...
7019936 Method and apparatus for head positioning control in perpendicular magnetic recording of disk drive  
A perpendicular magnetic recording disk drive is discloses which performs a head positioning control operation effectively against a hard easy transition shift (HETS) phenomenon. In the disk drive,...
7016142 Apparatus and method for removing mechanical resonance using adaptive notch filter  
An apparatus and method for removing mechanical resonance in a disc drive using an adaptive notch filter. Mechanical resonance harmful to a system is removed by a notch filter that adaptively...
7016141 Settle, rotational/linear vibration, and track follow controller optimization with shared state controller  
A shared state controller is provided that optimizes for settle, rotational vibration, and track following. The shared state controller uses the same state update equation with different output...
7016132 Magnetic data embedding system  
A magnetic data embedding system (or disk servo writer) includes a stack with a master disk ( 3 ) and a plurality of magnetic disks ( 4 ) mounted on a shaft of a spindle motor ( 6 ), and a rotary...
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...
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...
7009803 Method and apparatus of dual stage servo control for track following in a hard disk drive  
The invention operates two control paths. The micro-actuator control stimulates the micro-actuator. The voice coil motor control path includes the voice coil motor control generating a voice coil...
7009791 Position detecting method, information recording/reproducing device and information recording medium  
A position information signal pattern is recorded into a recording medium. The position information signal pattern is configured by arranging graphics having a circular shape, a rectangular shape...
7002769 Head control method and recording apparatus  
There is provided a head control method controlling move of a head on a discoidal recording medium including the steps of: partitioning the discoidal recording medium which has position information...
6999265 Method and system for dual element transducer flight height adjustment using combined thermal and electrostatic control  
A method and system control the flight height of a transducer element of a slider mechanism operating in association with a storage disk. The invention adjusts the flight height of transducer...
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...
6992853 Method and apparatus for determining modulated, amplitude ramping RRO harmonics in multi-screw clamped HDD disk/spind assembly  
A method for algorithmically determining, based on the number of screws used to hold the disks of a disk drive, harmonics of repeatable runout error during disk drive operation, such that...
6989955 Efficient transition from class D to linear operation in dual-mode voice coil motor controllers  
A dual-mode positioning driver for a voice coil motor in a disk drive system is disclosed. Linear prestage drivers and pulse-width-modulated prestage drivers are both coupled to power transistors...
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...
6987629 ***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
Rangeless servo notch optimization  
A method for placing a predetermined number of notch filters in a disc drive servo control system to attenuate noise frequencies, in order of decreasing resonance magnitudes, is disclosed. The...
6985543 Digital servo channel for recording apparatus  
A servo channel digitally processes the data read from a magnetic media. The channel uses both edges of a system clock to detect peaks and generates position error systems by an area-based...
6982848 Disk apparatus and head positioning method  
A disk apparatus includes: an actuator 7 ; a driver 10 ; a voltage detector 11 for outputting first voltage signal Ed which is produced in a driving coil 5 of the actuator 7 ; a voltage...
6977790 Design scheme to increase the gain of strain based sensors in hard disk drive actuators  
An actuator arm assembly has an actuator arm and an actuator for moving the actuator arm whereby the arm assembly experiences vibrations. The actuator has a body with a recess formed therein, and a...
6977788 Method and apparatus for adjusting angular position of magnetic head unit  
A significant change in the static angular position can be produced from a small physical displacement of the flexible member. The flexible member 12 in a magnetic head unit 95 is stressed for...
6975479 Magnetic disc storage apparatus  
There is provided a technique for controlling drive of a voice coil motor which can select, with priority for effective reduction, any one of heat generation and EMI noise which are presumed to...
6975471 Data recording medium with servo pattern having pseudo-random binary sequences  
A data recording medium, such as a magnetic recording hard disk, has data tracks with pseudo-random binary sequences for the servo information used to control the position of the recording head in...
6965547 Tracking and focus servo system with error signal inverse non-linearity calibration  
A digital servo system of an optical disk drive with a calibrated inverse non-linearity function is disclosed. A look-up table is determined, for example, with a focus error signal gain...
6961202 Data storage device having acceleration sensor attached to circuit board for detecting vibrations in planar rotation direction along circuit board  
A data storage device includes an enclosure case and a circuit board attached to an outer surface of the enclosure case, the enclosure case containing a spindle motor and a circular movement...
6954318 Magnetic data embedding apparatus having checking function  
Rotary positioners integrally and pivotally stack a read magnetic head for reading a master disk and servo heads for writing to each surface of magnetic disks, the master disk and magnetic disks...
6943969 Method of detecting protrusion on recording medium and detecting apparatus therefor  
An acoustic emission sensor is mounted on a flying slider opposed to a rotating recording medium, for example. The acoustic emission sensor outputs a detection signal in response to the sound of...
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...
6937423 Reducing effects of rotational vibration in disk drive  
A method of reducing rotational vibration effects in a disk drive by sensing vibration in a sensor and generating corresponding sensor data; deriving a statistical sensor (SS) value based on the...
6937422 Self-monitoring and self-healing of frequency specific position errors in a data storage device  
An apparatus and method of controlling an actuator of a data storage device detect and/or correct narrowband mechanical excitations such as due to spindle bearing defects through sensing and/or...
6937421 Patterned media having offset tracks  
An information recording system includes a storage medium, such as a magnetic or an optical medium, that is formed to have a plurality of adjacent tracks. Each track includes a plurality of storage...
Matches 51 - 100 out of 548 < 1 2 3 4 5 6 7 8 9 10 11 >