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| Number | Title | Issue Date |
| 8179629 | Flexure based shock and vibration sensor for head suspensions in hard disk drives Systems and methods for flexure based shock and vibration sensor for head suspensions in hard disk drives. Specifically, this invention deals with operational shock and vibration management within a hard disk drive. In one implementation, the assembly includes a cir... | 05/15/2012 |
| 7768738 | Mitigating the effects of disturbances of a disk drive Embodiments of mitigating the effects of disturbances of a disk drive are disclosed. One method includes sensing a position error signal of a transducer coupled to a surface of the disk drive, wherein the position error signal aids in control of an actuator of the d... | 08/03/2010 |
| 7701661 | Disk drive employing coarse position feedback from mechanical position sensor to improve format efficiency A disk drive is disclosed including a disk having a plurality of servo tracks. The servo tracks are banded together to form a plurality of servo track bands, and each servo sector comprises a fine track address that identifies one of the servo tracks. The disk drive... | 04/20/2010 |
| 7697234 | Storage apparatus, control method, and control device which enable or disable compensation control A rotation disturbance compensation control unit applies a compensation signal to a positioning control unit so as to cancel out rotation disturbance vibration components detected by using acceleration velocity sensors. At predetermined timing, a position error dete... | 04/13/2010 |
| 7602577 | Rapid off track detection using in-drive microactuator A microactuator incorporated within an actuator assembly of a disk drive is used as a detection element for rapid off track events that may occur. Preferably, the microactuator employs one or more piezoelectric elements used for purposes of secondary actuation. Unco... | 10/13/2009 |
| 7529057 | Servo loop employing correction vector from a secondary disturbance sensor to minimize correlation between servo loop error and disturbance sensor output A control system including a filter module generates a filtered disturbance signal based on a disturbance signal and a transfer function of the filter module. A set point adjustment module generates an adjusted set point signal based on a set point signal and the fi... | 05/05/2009 |
| 7480116 | Disk drive employing coarse position feedback from mechanical position sensor to improve format efficiency A disk drive is disclosed including a disk having a plurality of servo tracks. The servo tracks are banded together to form a plurality of servo track bands, and each servo sector comprises a fine track address that identifies one of the servo tracks. The disk drive... | 01/20/2009 |
| 7468857 | Acceleration feed-forward correction enabled or disabled based on track follow loop signals Disturbances to actuator control caused by external vibrations are corrected using feed-forward techniques that are selectively enabled or disabled based on signal values within a track follow loop. An increase in data integrity and reliability may be achieved by re... | 12/23/2008 |
| 7450335 | Reducing read/write head track misregistration Methods and systems for reducing read/write head track misregistration are described. According to one embodiment, a first signal is received from a first capacitive sensor that faces a surface of a disk associated with a disk drive. A second signal is received from... | 11/11/2008 |
| 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 |
| 7405896 | Method and apparatus for detecting slider/disk fly-height modulation in a hard disk drive A method and apparatus for detecting slider/disk fly-height modulation in a hard disk drive is provided. A slider is electrically isolating from an electrically grounded suspension. A signal line is coupled to the slider, the signal line for providing an alert signa... | 07/29/2008 |
| 7365932 | Disk drive comprising an optical sensor for vibration mode compensation A disk drive is disclosed comprising an actuator arm, a head attached to a distal end of the actuator arm, a voice coil motor for rotating the actuator arm about a pivot, and an optical sensor operable to generate a first position signal representing a position of t... | 04/29/2008 |
| 7359138 | Method of feedback control for active damping of slider air bearing vibrations in a hard disk drive slider In method of feedback control for active damping of slider air bearing vibrations in a hard disk drive slider, a slider is isolated from ground. A velocity signal is acquired from the slider. The velocity signal is filtered to acquire a vibration signal. The vibrati... | 04/15/2008 |
| 7355808 | Method and apparatus for partial self-servo writing using servo wedge propagation A method and apparatus for partial self-servo writing a disk surface in a disk drive using servo wedge propagation is provided. In one embodiment, servo information is written by a servo track writer near an outer diameter of the disk surface. The servo information ... | 04/08/2008 |
| 7352529 | Magnetic recording medium and magnetic recording and reproducing device using a magnetic recording layer formed with a predetermined concavo-convex pattern A magnetic recording medium including at least a disk substrate 1A, a magnetic recording layer 5 formed with a predetermined concavo-convex pattern on the disk substrate 1A, and a non-magnetic layer 6 filled into concave portions of the c... | 04/01/2008 |
| 7339762 | Magnetic recording and reading device A magnetic recording and reading device includes a magnetic recording medium having a substrate and at least one magnetic recording layer formed above the substrate, a magnetic head enabling a data transfer rate of more than 50 MB/s and a recording density of more t... | 03/04/2008 |
| 7333289 | Magnetic recording and reproducing apparatus, method of controlling the same, magnetic recording medium, and stamper for manufacturing magnetic recording medium A magnetic recording and reproducing apparatus and a method of controlling the same, capable of increasing the output of a position control signal and performing a precise positioning control of a magnetic head. The magnetic recording and reproducing apparatus has: ... | 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 |
| 7321476 | Method and system for determining contact potential in a hard disk drive A method and system for determining contact potential voltages between a slider body and a hard disk of a hard disk drive. In embodiments of the present invention, at least one continuous negative direct current (DC) voltage is applied between a slider body and a ha... | 01/22/2008 |
| 7319522 | Systems and methods for in situ spectroscopic measurements A circularizated semiconductor laser diode (CSLD), such as for example a vertical cavity surface emitting laser (VCSEL) may be used for optical measurements. The CSLD may be used in a cell density probe to perform cell density determination and/or turbidity determin... | 01/15/2008 |
| 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 |
| 7292407 | Disk drive with support structure for disk-vibration capacitive sensors A data recording disk drive has one or more capacitive sensors for sensing out-of-plane vibration of the disk or disks. The sensors are attached to a support structure that is attached to the disk drive housing. Each sensor is associated with a disk and faces a surf... | 11/06/2007 |
| 7275302 | Method of forming a disc pack A method of forming a disc pack for use in a disc drive is provided. The method includes forming at least one alignment feature between an inner diameter and an outer diameter of each of a plurality of discs. The at least one alignment feature of a first disc of the... | 10/02/2007 |
| 7277252 | Method of feedback control for active damping of slider air bearing vibrations in a hard disk drive slider In a method of feedback control for active damping of slider air bearing vibrations in a hard disk drive slider, a slider is isolated from ground. A slider velocity signal is filtered to acquire a vibration signal. The vibration signal is adjusted in amplitude to ac... | 10/02/2007 |
| 7265922 | Asperity data storage system, method and medium An asperity data storage system wherein asperities are used to represent stored data. The asperity data storage system includes an asperity transducer that thermally interacts with a data storage medium adapted to store an information-encoded pattern of asperities t... | 09/04/2007 |
| 7265931 | Apparatus 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 external shock or vibration occurs. The alternative sensing schemes ... | 09/04/2007 |
| 7265935 | Velocity adaptive compensator for a synchronous sampling time-based servo system Disclosed are a system, a method, and article of manufacture to provide a velocity adaptive compensator for a synchronous sampling servo control system. ... | 09/04/2007 |
| 7256586 | Method and device for measuring the repeatable and non-repeatable runout of rotating components of a spindle motor The method and a device to measure the repeatable and non-repeatable runouts of a rotating component of a spindle motor with the aid of at least one probe measuring changes in the distance between the probe and the rotating component depending on the angle of rotati... | 08/14/2007 |
| 7255908 | Magnetic tape A magnetic tape (1) characterized by having a backcoating layer (5) which comprises a binder and fine particles having been dispersed in the binder and being capable of irreversibly changing in color on oxidation reaction, and has a sufficient number o... | 08/14/2007 |
| 7233453 | Servo track writing device and method thereof A vibration extraction processing unit extracts a deflection component synchronous with a rotation from a clock signal of a non-contact sensor so as to correct a clock jitter. A clock generating unit generates a clock signal of any format frequency preliminarily set... | 06/19/2007 |
| 7227717 | Asymmetric disk surface properties in one head disk drives A disk drive for storing data includes a drive housing and an asymmetrical storage disk. The storage disk includes a body region, a first side region, and an opposed second side region. The side regions are asymmetrical relative to the body region. Various structure... | 06/05/2007 |
| 7224544 | Method and device for recording data and erasing servo data After a DC erasing is performed in a direction by permanent magnets on a servo signal recording part, servo signals are recorded in the signal recording area of the servo signal recording part by a magnetic field in the direction opposite to that of the DC erasing. ... | 05/29/2007 |
| 7221528 | Magnetic alignment marking of hard disks Magnetic alignment marks are recorded on a recording surface of a magnetic hard disk to mark the location where the disk is abutted against the hub of the spindle of a multiple-disk servo-writer. The alignment marks for each recording surface may be different so as ... | 05/22/2007 |
| 7219840 | Calibrating fine actuator using a reference pattern A disc media marking systems and methods facilitate optical disc labeling through calibration of a fine actuator using a reference pattern. ... | 05/22/2007 |
| 7215504 | Disk drive using an optical sensor to detect a position of an actuator arm A disk drive is disclosed comprising a disk, an actuator arm, a head coupled to the actuator arm, a base, and an optical sensor operable to detect a position of the actuator arm. The optical sensor comprises a light source that is stationary relative to the base, a ... | 05/08/2007 |
| 7215500 | Feedback control mechanism for active damping of slider air bearing vibrations in a hard disk drive slider In a feedback control mechanism for active damping of slider air bearing vibrations in a hard disk drive slider, an assembly is used to acquire a velocity signal from the slider. A filter, electrically coupled with the assembly, is used to filter a velocity signal t... | 05/08/2007 |
| 7212374 | Disk drive to characterize misaligned servo wedges Disclosed is a disk drive to characterize misaligned servo wedges. A disk of the disk drive includes a plurality of circumferential tracks, in which, each track includes a plurality of servo wedges spaced sequentially around the circumference of the track wherein th... | 05/01/2007 |
| 7202979 | Optical rotational position information detecting apparatus An apparatus for optically detecting rotational position information of a rotating object, includes a light source, a detector which is located at a position to receive scattered light from the rotating object when the rotating object is irradiated with a light beam... | 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 |
