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7385781 Multi-arm disk drive system having interleaved read/write operations and method of controlling same  
A hard disk drive system that includes one or more rotating data storage platters, a drive controller and multiple actuator assemblies and corresponding respective read/write heads. The actuator...
7379257 Magnetic disk drive  
A magnetic disk drive includes an actuator arm, a suspension fixed to a tip end of the actuator arm, and a head slider having at least two electromagnetic transducers mounted at a tip end of the...
7375911 Piezoelectric actuator and sensor for disk drive dual-stage servo systems  
A hard disk drive is disclosed comprising at least one disk rotatable about an axis, an actuator assembly moveable relative to the disk, a transducer positioned on the actuator assembly, an...
7324301 Striping data simultaneously across multiple platter surfaces  
A hard disk drive comprises an actuator with independently movable arms and a printed circuit board with custom core electronic architecture. The drive also comprises one or more platters...
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...
7283319 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...
7274525 Information processing system  
There is disclosed an information processing system which makes it impossible for a malicious third person to intrude thereinto from the outside through an external network for altering information...
7209321 Disk drive pulse width modulating a voice coil motor using model reference current feedback  
A disk drive is disclosed comprising a voice coil motor (VCM) driven in a PWM mode using model reference current feedback. The PWM circuitry and VCM form a plant transfer function which varies with...
7193804 Method and apparatus for controlling head velocity in a disk drive during ramp load/unload  
A disk drive controls head velocity during ramp load/unload by measuring voltages across a VCM and a sense resistor in series with the VCM, calculating a back EMF voltage using the VCM and sense...
7102842 Disk data storage apparatus and method using multiple head actuators  
A multi-head actuator data storage device reads and writes data simultaneously to one of a plurality m of heads, the plurality of m heads mounted on each of n head actuators where the plurality of...
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...
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...
6972540 Disk drive employing wedge spindle speed control with eccentricity compensation  
A disk drive is disclosed wherein a BEMF speed error is measured during a BEMF spindle speed control mode, and a spindle control current is updated in response to the BEMF speed error to drive the...
6954105 Disk drive and error amplifier therefor and related methods  
An amplifier may include an output stage including first and second output transistors, and a biasing stage for generating first and second biasing voltages at control terminals of the first and...
6947251 Disk drive having electrically parallel actuator coils for selectively boosting actuator torque  
A disk drive includes a disk, a voltage supply, a head stack assembly and a switching circuit. The head stack may include a coil portion that includes a coil assembly having first and second wound...
6934112 Method for obtaining head positions in magnetic data writing apparatus  
A method for obtaining relative positional relationships between a read-only head for reading data from an original disk and servo heads on each surface of magnetic disks (copy disks), in a...
6922305 Apparatus and method for reducing vibrational excitation in storage devices with dual stage actuators  
Disclosed is an apparatus and method for reducing vibration in dual stage actuators of storage devices such as hard disk drives. The apparatus comprises a compensating mass disposed on an outer arm...
6914746 High sustained data rate storage devices having microactuator  
Multiple recording heads are used to perform parallel read and write operations on multiple disk surfaces in disk drives. Small-scale actuators are positioned between the transducer and the...
6882494 Sensor system for disk device using floating head  
A sensor system for a disk device by using a floating head, comprising a head element that floats over a data recording area of a rotating disk so as to write data thereon or read data therefrom, a...
6847504 Split VCM actuator  
A split actuator comprising two spring coupled actuators that share a common pivot bearing. The two reduced inertia actuators permit overlapping motions during a seek operation thereby reducing...
6829119 Disc drive microactuator with lateral position sensor  
A read/write head microactuator includes first and second insulating deposits that are flat, spaced apart by an air gap, and laterally movable responsive to a microactuator electrical drive...
6826002 Measuring apparatus and measuring method for measuring performance characteristics of recording unit including circular recording medium  
A measuring apparatus and a method is provided for measuring performance characteristics of a recording unit including a circular recording medium on which one track is divided into a plurality of...
6798610 Disk drive with self servo writing capability  
The present invention is directed to utilizing the capabilities of multi-stage actuators in disk drives to do self servo writing on the disk surfaces, thereby avoiding the use of a servo track...
6798609 Magnetic microactuator with capacitive position sensor  
A disc drive system includes a recording disc rotatable about an axis, a slider supporting a transducing head for transducing data with the disc, and a dual-stage actuation assembly supporting the...
6795268 Disk drive employing seek time vcm ir voltage calibration for velocity control of an actuator arm  
A disk drive is disclosed comprising a disk, a head, an actuator arm for actuating the head radially over the disk during a seek operation, and a voice coil motor (VCM) for rotating the actuator...
6785088 Head positioner apparatus for data storage and retrieval  
A head positioner is described wherein a read/write head is slidably propelled along an arm by an electrically, an acoustically, or an magnetically active material. One embodiment is comprised of a...
6785086 Transducer-level microactuator with dual-axis control  
A slider for carrying and finely adjusting both a radial position and a flying height of a transducing head with respect to a track of a rotatable disc includes a stator portion carried by a...
6768614 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...
6765743 Micro-actuator transducer stack inertia cancellation control  
A micro-actuator of a head suspension either is wired in a reverse polarity to effect movement of the suspension arms in opposing directions relative to the magnetic disks or reversed in physical...
6760178 Disk memory apparatus compensating for temperature in a circuit for monitoring the back electromotive force of a voice coil motor, and method for controlling of a disk memory apparatus  
At the time of the loading of head, the CPU flows a plurality of different currents to VCM, and by reading the back electromotive force monitor value of the back electromotive force monitor circuit...
6751047 Stepped disc drive voice coil actuator acceleration for reducing resonance of head level micro-actuators  
A disc drive having a voice coil actuator with an attached suspension and head, the head including a micro-actuator. The micro-actuator having at least one natural frequency and at least one...
6747837 Disk drive comprising an integrator for controlling a VCM actuator and transformer for controlling a piezoelectric actuator  
A disk drive is disclosed comprising a voice coil motor (VCM) actuator and a piezoelectric (PZT) actuator. The VCM actuator is driven by a control effort including an integrator, and the PZT...
6744577 Piezoelectric actuator and shock sensor  
A dual purpose piezoelectric element utilized in a disk drive for fine positioning of the head assembly relative to the surface of a disk and for sensing shocks and other vibrations. When a shock...
6741417 Plant variation compensation for piezoelectric microactuator in dual-stage servo of disc drives  
A method and system for providing plant variation compensation for a microactuator in a dual-stage servomechanism of a disc drive. The method includes performing indirect adaptive filtering to...
6735036 Control of data sensor fly height  
A data storage device includes a head suspension assembly having an attached airfoil. The airfoil is coupled to an active (i.e., movable) element that responds to signals from height control...
6735032 Servo write timing generation in a multi-actuator disk drive  
A multi-actuator disk storage device has at least two actuators respectively mounting plural product heads. Servo writing is performed using the product heads themselves. A first servo write...
6731454 Disk drive with a pivot embedded torque generating track follow actuator and method therefor  
A disk drive system (and method) includes an actuator system including a first voice coil motor (VCM), a second voice coil motor for enhancing dynamic resonance properties of the actuator system,...
6724162 Motor-control device enabling the rotational speed of the motor's rotor to be measured  
A device for controlling a motor intended to set an arm provided with a head for reading/writing information in motion with respect to a surface carrying information. The device having a controller...
6721127 Electronic device for driving an actuator device for a hard disk and for driving a motor that turns the hard disk  
An electronic device for driving an actuator device for a hard disk and a motor for turning the hard disk, the device having a first driving circuit connected to the rotation motor and integrated...
6721126 Position identification for a coarse actuator portion of a compound actuator  
A method and position control for a servo system for positioning a head laterally with respect to defined servo tracks. The servo system comprises a servo sensor and detector for sensing lateral...
6721125 Position sensing system for disc drive magnetic microactuators  
An apparatus and method for sensing the position of a read/write head or transducer carried by a microactuator at a distal end of a primary actuator in a head disc assembly of a disc drive. The...
6704157 Passive damping method and circuit for data storage device actuator  
Passive damping of a disc drive structural member is achieved using a tuned resonance passive damping circuit. This circuit can, for example, be connected to a head gimbal assembly that has a...
6697211 Magnetic head drive device  
A head drive device for positioning a read and/or write head for reading and/or writing information to and from a disk coated with a recording medium, the head drive device including a carriage, a...
6674605 PQ enhanced dual stage servo controller  
A servo controller controls the servo system in a disc drive. A proportional integrator component receives the target track signal indicative of a target track and a measured track signal...
6631045 Method and apparatus for ramp loading in a hard disk drive using pulse width modulation  
A method and apparatus to control application of a drive current to a voice coil in a hard disk drive system modulates a periodic waveform between either a reference level and a signal associated...
6624982 Magnetic disk recording apparatus  
In a magnetic recording apparatus including a support arm movable with respect to a magnetic recording disk, a first actuator for moving the support arm with respect to the magnetic recording disk,...
6621653 Secondary actuator system for mode compensation  
A secondary servo actuator system for use in disk drives comprising a controller and two PZT transducers mounted on each suspension load beam in an arm assembly. When a seek operation is initiated...
6600619 Vibration control of piezoelectric microactuator  
A system and method for controlling vibration of a piezoelectric microactuator in a disc drive are disclosed. The mechanical strain on the piezoelectric microactuator is ascertained and fed back to...
6590734 Observer based dual stage servo controller with gain boost to accomodate rotational vibration  
The present invention includes a servo control system for controlling a dual stage actuator in a disc drive. The disc drive includes a data head for accessing information on a disc surface, and the...
6587303 Servo control of a coarse actuator  
A servo system and method position a head laterally with respect to defined servo tracks, employing fine and coarse actuators. A servo control integrates the position error between the head and a...
Matches 1 - 50 out of 197 1 2 3 4 >