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| Number | Title | Issue Date |
| 8154823 | Information recording and reproducing apparatus, information recording and reproducing system, information processing apparatus and information reproducing apparatus An information recording and reproducing apparatus 1 having a high efficiency of information transfer includes one or more recording media forming a plurality of recording surfaces, a plurality of heads respectively disposed on the recording surfaces, a first... | 04/10/2012 |
| 7940490 | Apparatus and method for improving bandwidth of a fine positioning mechanism data storage manufacturing and test equipment An apparatus and a method for improving bandwidth of a fine positioning mechanism in data storage manufacturing and test equipment that require fine positioning of a head on or about a track. The method comprises the steps of sensing separate sources of mechanical d... | 05/10/2011 |
| 7599145 | Storage medium device, deformation controller and head slider A storage medium device has at least one head which includes a read head element and a write head element. The device has a deformable element which changes a distance between the read head element and the write head element in a circumferential direction, a storage... | 10/06/2009 |
| 7595956 | Microactuator reference input limit to prevent internal states over-accumulation A microactuator reference limit used to prevent over-accumulation of internal states may be set based on the microactuator's mechanical properties and is applied at the reference point to the microactuator servo subsystem. A microactuator variable input limit to pre... | 09/29/2009 |
| 7570451 | Servo architecture for high areal density data storage A track accessing mechanism includes a track accessing arm actuable by a primary actuation device for accessing concentric data tracks on a storage medium and at least one slider attached to the track accessing arm. The at least one slider includes a servo head conf... | 08/04/2009 |
| 7548396 | Storage apparatus, control method, and control device of storage apparatus A seek control unit moves a head to the vicinity of a target track of a storage medium by coarse control, then switches it to fine control, and positions the head to the target track. A rotation disturbance compensation control unit applies a rotation disturbance vi... | 06/16/2009 |
| 7474496 | Micro actuator DC gain calibration scheme for HDD dual-stage actuator systems A servo system for a hard disk drive comprising a first actuator, a second actuator, a head, and a disk on which is formed a plurality of tracks containing servo data. The servo system comprises a first stimulus, a second stimulus, and a calibration system. The firs... | 01/06/2009 |
| 7423837 | Micro actuator gain calibration based on a sinusoidal input signal Control of micro actuator movement is calibrated in response to a sinusoidal input signal. A response of the micro actuator to the sinusoidal input signal is measured, for example, based on measurement of a change in radial location of a transducer connected to the ... | 09/09/2008 |
| 7385780 | Online identification of secondary actuator transfer function via system decoupling in multiple-stage actuator servo systems in disk drives A hard disk drive that includes a voice coil motor and a micro-actuator. The micro-actuator is controlled by a servo that utilizes a micro-actuator controller and a corresponding micro-actuator transfer function. The servo enters a mode to self-determine at least on... | 06/10/2008 |
| 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 |
| 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 |
| 7342740 | In-situ compensation method of microactuator stroke sensitivity subject to temperature variation A hard disk drive that includes a voice coil motor and a micro-actuator. The micro-actuator is controlled by a servo that utilizes a micro-actuator calibration parameter. To compensate for temperature changes within the disk drive the micro-actuator calibration para... | 03/11/2008 |
| 7333288 | Method and apparatus for single written-in Repeatable Run-Out correction function used in multi-stage actuation control of hard disk drive RRO corrector function is formulated to partition the contribution of micro-actuator control from the other voice coil assembly contributions. Single stage actuation is supported by zeroing the micro-actuator control queue, otherwise multi-stage actuation is support... | 02/19/2008 |
| 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 |
| 7315493 | Apparatus and method for calibrating a laser imagible apparatus A laser imagible apparatus includes a lens, a media tray, and an adjustment mechanism. The adjustment mechanism is configured to determine a voice coil gain for substantially all locations on a media. ... | 01/01/2008 |
| 7312945 | Techniques for adjusting for actuator non-linearities in a data storage system The invention provides techniques for adjusting for actuator non-linearities in a data storage system. The invention is particularly useful for piezoelectric actuators, such as actuators that implement a bimorph piezoelectric crystal structure or a laminate piezoele... | 12/25/2007 |
| 7304817 | Jerk controlled seek system A hard disk drive that includes a voice coil motor controlled by a servo circuit. The servo circuit provides a sinusoidal driving signal that has two different harmonic frequencies. The dual harmonic waveform creates a voice coil motor jerk profile (derivative of ac... | 12/04/2007 |
| 7304818 | Preconditioning an elastomeric stop member for use as a reference position An apparatus and associated method for preconditioning an elastomeric stop member to create a stabilized reference position for a moveable member by repetitively biasing the moveable member against the stop member and using the stabilized reference position to initi... | 12/04/2007 |
| 7292001 | Gain adjusting method for servo control device An object of this invention is to provide a gain adjusting method in a servo control device to suppress changes according to a place where a machine is located. This invention provides a gain adjusting method for a servo control device providing speed control... | 11/06/2007 |
| 7292403 | Low frequency disturbance compensation control device and disk drive using the same A servo control device for a disk drive capable of effectively compensating for a low frequency disturbance incoming to the disk drive is provided. The servo control device includes: a state variable estimator calculating a position estimation error based on a contr... | 11/06/2007 |
| 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 actuator. The disk drive includes a rotatable data storage disk, a head, an... | 10/23/2007 |
| 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 microactuator and the head relative to the disk. The servo controller contr... | 10/16/2007 |
| 7280308 | Motor drive semiconductor integrated circuit and magnetic disk storage apparatus The Invention provides a motor drive semiconductor integrated circuit for driving and controlling a voice coil motor that can conduct a seek operation, a track follow operation and a settling operation through PWM control, has desired control accuracy and can be pro... | 10/09/2007 |
| 7280304 | Method and circuit for compensating slow-varying runout of disk storage system A method and a circuit for compensating a slow-varying runout of a disk storage system are provided. First, generate a basic runout compensation signal (BRC signal) and according to a position signal extracted from the pickup head output generate a runout error sign... | 10/09/2007 |
| 7277257 | Transducer-level microactuator for a magnetic recording system A transducer-level microactuator selectively positions a transducer portion of a slider radially with respect to circumferential data tracks of a rotatable disc. The slider includes a slider body having a leading edge and a trailing edge, a transducer body and a fle... | 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 |
| 7271753 | Calibration of analog front end for gain sensitive measurements Methods of calibrating an analog front end (AFE) of a read/write channel include measuring a first magnitude of a test signal, measuring a second magnitude of an output signal of the AFE generated in response to the test signal, and comparing the first magnitude and... | 09/18/2007 |
| 7265933 | Disk drive computing repeatable run out while actuator arm is pressed against crash stop A disk drive is disclosed comprising a voice coil motor (VCM) for rotating an actuator arm about a pivot in order to actuate a head over a disk. The disk is rotated by a spindle motor, and a feed-forward compensation value is computed that compensate for a non-centr... | 09/04/2007 |
| 7265936 | Algorithm for DSA/microactuator total loop gain calibration A hard disk drive that includes a voice coil motor and a micro-actuator. The disk drive includes a servo with a voice coil motor loop, a micro-actuator loop and an overall loop. The servo is calibrated by first calibrating the voice coil motor loop, then calibrating... | 09/04/2007 |
| 7259496 | Tunable vibratory actuator A tunable machining tool having a plurality of actuator devices, each operating at a uniform frequency but phase shifted by a controllable amount so as to create an vibratory output at a frequency that is a multiple of the input frequency. ... | 08/21/2007 |
| 7250738 | Nonlinear hysteresis control system A nonlinear hysteresis control system for controlling an actuator with nonlinear hysteresis effect is disclosed. An improved extended hysteresis effect profile further stores the displacement when a applied voltage of the actuator is from 0 voltage to a specific vol... | 07/31/2007 |
| 7248444 | Electromagnetic heads, flexures, gimbals and actuators formed on and from a wafer substrate Devices for reading or writing electromagnetic information include a wafer substrate piece disposed between an electromagnetic transducer and an electrostrictive or piezoelectric actuator. The substrate piece is shaped as a rigid body adjoining the transducer and as... | 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 |
| 7239487 | Micro-electro-mechanical actuator for positioning a device such as a read/write head in a disk drive A micro-electro-mechanical device formed by a body of semiconductor material having a thickness and defining a mobile part and a fixed part. The mobile part is formed by a mobile platform, supporting arms extending from the mobile platform to the fixed part, and by ... | 07/03/2007 |
| 7230799 | Electro-thermal micromechanical actuator for finitely positioning a storage device slider and methods of use and manufacture A system and method for controlling the position of a digital data storage device slider through the use of an electro-thermal micromechanical actuator is disclosed. A movable member is etched into a face of a slider opposite the air-bearing surface of the slider. T... | 06/12/2007 |
| 7227714 | Methods for conditional servowriting To account for head misplacement while servowriting, conditional writing and/or trimming of servo information can be used. Conditional servowriting allows servowriting to be disabled when it is determined that servo information will not be written and/or trimmed at ... | 06/05/2007 |
| 7221627 | Optical device for reading information An optical playback or recording device is equipped with mass-unbalance detection means (20) for detecting unbalance on the record carrier (2). Mass-unbalance causes vibration and sound in the optical device when the record carrier (2) is rotate... | 05/22/2007 |
| 7218472 | Magnetic recording and reproducing apparatus and control method for the same A magnetic recording and reproducing apparatus includes: a magnetic recording medium onto which servo information including position information is recorded by a plurality of concavo-convex patterns formed by a magnetic layer; a gate circuit that extracts a part of ... | 05/15/2007 |
| 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 |
