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| Number | Title | Issue Date |
| 8300350 | Magnetic disk drive using offset in positioning head to read data and head positioning method According to one embodiment, a magnetic disk drive comprises a write count memory, a read offset setting module and a controller. The write count memory stores a write count for each track or for each zone on a disk. The read offset setting module sets, in accordanc... | 10/30/2012 |
| 8154821 | Magnetic head-positioning servo system, magnetic head test system and magnetic disk test system A magnetic head-positioning servo system is provided to accurately test a magnetic disk with a track written in advance, by providing two fine actuators. The second fine actuator, to which a magnetic head is attached, is mounted on the first fine actuator. The secon... | 04/10/2012 |
| 8027119 | Vibration detection and compensation filter The application relates to an adaptive vibration damping scheme that provides for detection of, and adjustment for, vibration-related disturbances in devices. The vibration damping scheme utilizes a common filter function to implement vibration detection and vibrati... | 09/27/2011 |
| 8009382 | Position control apparatus and disk apparatus using the same According to one embodiment, a position control apparatus includes: a digital control module that performs position control including disturbance adaptive control with a predetermined sampling period using a control constant, in accordance with a position error; and... | 08/30/2011 |
| 7944643 | Patterns for pre-formatted information on magnetic hard disk media A magnetic disk media is physically preformatted to have a non-user data area providing any of a servo pattern, a gray code pattern and a timing line pattern. The non-user data area patterns are preformatted to have non-recordable regions with a radial width that is... | 05/17/2011 |
| 7903366 | Write-once type storage apparatus, control circuit, and control method A recording processing unit sets a track pitch narrower than a writing width of a recording element so that part of the recorded track overlapped with the unused track is overwritten, and continuously records information on a disk medium toward one direction in acco... | 03/08/2011 |
| 7881007 | Unequal zoning for track following on a hard disk drive Unequal zoning for track following on a hard disk drive comprising at least one magnetic disk, a read/write head connected to at least one actuator arm and capable of reading and writing data on said at least one magnetic disk, a controller capable of moving said at... | 02/01/2011 |
| 7881006 | Long-term asymmetry tracking in magnetic recording devices A technique tracks head asymmetry of a magnetic recording device over time. In particular, a reference pattern having a known fundamental/reference frequency may be read from a reserved track of a magnetic recording medium to produce a response signal, and signal po... | 02/01/2011 |
| 7872829 | Method and apparatus for offset control in a disk drive According to one embodiment, there is provided a disk drive that can perform dynamic offset control (DOC). The disk drive has a magnetic head, a disk, and offset calculating modules. The magnetic head has read head. Offset-measuring position data is written in a non... | 01/18/2011 |
| 7848050 | Positioning control system and method therefor There is provided with a positioning control system which includes: a head moving unit configured to move a head for recording or reproducing information with respect to a disk capable of recording information; a position detecting unit configured to detect a positi... | 12/07/2010 |
| 7826210 | Sliding front carriage for an information handling system chassis An information handling system chassis includes a chassis base, a carriage, and a carriage sliding system. The chassis base is configured to house a plurality of first electrical components. The carriage is configured to house one or more second electrical component... | 11/02/2010 |
| 7800859 | Recording/reproducing apparatus and tracking servo control method A recording/reproducing apparatus includes: a rotary-type magnetic recording medium including a track pattern with concentric or spiral data recording tracks; a composite magnetic head including a reproducing element that reads magnetic signals from the medium and a... | 09/21/2010 |
| 7787208 | Bit patterned medium having super-track, method of tracking track of bit patterned medium, head appropriate for bit patterned medium, and information recording/reproducing apparatus including bit patterned medium head Provided are a bit patterned medium having a super-track, a method of tracking a track of the bit patterned medium, a head appropriate for the bit patterned medium, and an information recording/reproducing apparatus including the bit patterned medium and the head. T... | 08/31/2010 |
| 7764458 | Up-sampled filtering for servo demodulation An apparatus, method, and system for providing a fine adjustment for transducing head positioning in a hard disk drive (HDD). The apparatus, method, and system include reading a positioning error field wherein the resulting signal is a substantially sinusoidal posit... | 07/27/2010 |
| 7751143 | Head position control method, head position control device, and magnetic recording evaluation apparatus A magnetic head position control method is provided to control a magnetic head to follow the track on a DTM (discrete-track magnetic) disk by accurately detecting the eccentricity compensation amount through a simple process. An angle detection unit detects θ1 | 07/06/2010 |
| 7746593 | Method and apparatus for determining offset between read head and write head in a disk drive According to one embodiment, a disk drive is disclosed which has an offset measuring function for measuring a dynamic offset value necessary to a dynamic offset control using a DTM (discrete track media) type disk. A CPU (microprocessor) included in the disk drive w... | 06/29/2010 |
| 7719787 | Phase locked anti- notch filter in a servo control loop An anti-notch filter in a servo control loop is phase locked to a nonrepeatable runout component of a servo control loop signal. The phase locked anti-notch filter may thereby more effectively track time varying characteristics of the nonrepeatable runout component ... | 05/18/2010 |
| 7706099 | Magnetic disk drive and method of controlling the same Embodiments of the present invention provide a magnetic disk drive, in which a disturbance component contained in an output signal from a rotational vibration detector, can be appropriately suppressed irrespective of frequency of the component, and a method of contr... | 04/27/2010 |
| 7701660 | Shock cancellation system A control system includes a difference generating module for a rotating storage system that generates a position error signal based on a target position signal and a current position signal. A control module of the control system generates an output response based o... | 04/20/2010 |
| 7684142 | Disk device, positioning control circuit and information processing apparatus using same A disk device has a positioning control system which has a disturbance suppression function in which the disturbance is suppressed quickly to prevent vibration of the head. In a positioning system having a disturbance suppression function of a disk device, an interf... | 03/23/2010 |
| 7626781 | Data recording device Embodiments of the present invention provide a data recording device capable of achieving desired performance while increasing the convergence rate. According to one embodiment, in a data recording device, an update-width determination unit included in a setting upd... | 12/01/2009 |
| 7599144 | Method and apparatus compensating disturbance in state control device A method and system are disclosed for compensating disturbance applied to a plant, such as a HDD component, controlled by a state control device having an estimator & controller. The estimator & controller is adapted to generate a first control signal in response to... | 10/06/2009 |
| 7583469 | Up-sampled filtering for servo demodulation An apparatus, method, and system for providing a fine adjustment for transducing head positioning in a hard disk drive (HDD). The apparatus, method, and system include reading a positioning error field wherein the resulting signal is a substantially sinusoidal posit... | 09/01/2009 |
| 7583468 | Method and apparatus of dual stage servo control with dual control paths and decoupling feedback for track following in a hard disk drive A magnetic head follows a track in a hard disk drive as positioned by micro-actuator and voice coil motor. Embodiments operate two control paths. The micro-actuator control path generates a version of micro-actuator control signal stimulating the micro-actuator. The... | 09/01/2009 |
| 7580217 | Disk drive with hybrid analog-digital acceleration feedforward control system and method for rejecting rotational vibration A disk drive uses a hybrid analog-digital acceleration feedforward control system and method for cancellation of rotational disturbances. A rotational vibration (RV) sensor is used with an analog circuit to generate an analog feedforward signal that is summed with t... | 08/25/2009 |
| 7576940 | Method and apparatus for estimating micro-actuator stroke sensitivity in a hard disk drive Method of estimating the stroke sensitivity of micro-actuator coupled with slider and its read-write head. Micro-actuator stimulus signal used to drive micro-actuator, inducing noise into lateral positioning of read-write head near track by voice coil motor to creat... | 08/18/2009 |
| 7561369 | Drive unit Embodiments in accordance with the present invention provide a drive unit that is capable of satisfactorily performing the positioning control with disturbance components included in a position error signal being effectively controlled. According to one embodiment, ... | 07/14/2009 |
| 7548393 | HDD track following control apparatus and method A track following control apparatus and method for a hard disk drive (HDD) is disclosed and includes an estimator receiving a position error signal from a HDA and generating estimated state information for a magnetic head in response to the position error signal, an... | 06/16/2009 |
| 7525753 | Reducing seek wind-up in a disk drive using early acceleration feedforward signal Methods of controlling a transducer that is adjacent to a rotatable data storage disk in a disk drive are disclosed, the disk drive having an actuator configured to position the transducer, a rotational acceleration sensor configured to generate a rotational acceler... | 04/28/2009 |
| 7443630 | Apparatus, system, and method for writing magnetically encoded data to discrete lands An apparatus, system, and method are disclosed for writing magnetically encoded data. A servo module positions a write head relative to a first land such that a first edge of the write head is positioned substantially over a first land edge of the first land. The wr... | 10/28/2008 |
| 7443626 | Patterned disk medium for vertical magnetic recording, and magnetic disk drive with the medium A patterned disk medium includes a disk-shaped flat substrate including a first surface and a second surface located an opposite side of the first surface. First servo pattern areas including portions provided with magnetic members and portions provided with no magn... | 10/28/2008 |
| 7423833 | Servo loop employing correction vector from a secondary disturbance sensor to minimize correlation between servo loop error and disturbance sensor output A noise canceling system includes a signal generator module that generates a set point signal based on a desired position signal and a position feedback signal, a summation module that generates an output control signal based on the set point signal and a correction... | 09/09/2008 |
| 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 |
| 7417821 | Information recording apparatus According to embodiments of the present invention, tracks can be formed on a magnetic recording medium on a zonal area at intervals of either a first track pitch or a second track pitch, both of which differ from each other. For a reference track defined in each zon... | 08/26/2008 |
| 7405898 | System and method for generating a position error signal (PES) reference curve in a data storage device System and method for generating a Position Error Signal (PES) reference curve in data storage devices are provided. The method includes scanning a distance of at least one Track Pitch (TP) in a cross-track direction in each servo-burst along a predefined path. One ... | 07/29/2008 |
| 7405899 | Method for determining read/write head position based on phase detection of a servo pattern A method determines RW head radial position relative to tracks within a magnetic data disc. This involves sensing both a S-burst signal and a P-burst signal with the RW head. The S-burst signal and P-burst signal are associated with a two-burst servo pattern on the ... | 07/29/2008 |
| 7400468 | Vibration detector for hard disk drives A hard disk drive with a circuit that provides a control signal to a voice coil motor to move a head across a disk. The disk drive includes a circuit that provides a control signal to the voice coil motor to move the head. The circuit also has a state predictor and ... | 07/15/2008 |
| 7400467 | Methods and apparatus for managing write inhibit in response to a predictive metric Methods of controlling reading/writing by a read/write head of a disk drive include generating a position error signal indicative of a displacement of the read/write head from a desired radial location on a surface of a data storage disk. A control signal for moving... | 07/15/2008 |
| 7397627 | Method of detecting position of head for recording medium A head is moved in a lateral direction on the boundary between a separation track and a recording track on a recording medium. The separation track isolates the adjacent recording tracks from each other. A variation is detected in the output supplied from the head b... | 07/08/2008 |
| 7394613 | Control device, disk device, and seek orbit generation method A waveform generator generates an acceleration orbit, a velocity orbit, and a position orbit from the seek time. Each orbits multiplied by respective gains, whereupon the orbits are synthesized by a first adder. The resulting composite orbit is multiplied by a seek ... | 07/01/2008 |
