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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...
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...
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...
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...
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...
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...
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....
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...
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,...
7199960 Disk drive with AC exciter for head/disk interface  
A disk drive includes a disk for storing information, a head with a transducer that writes data to and reads data from the disk, and an AC power source. The head is suspended adjacent to the disk...
7193806 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, a filter is used to filter a velocity signal from a slider to acquire a vibration...
7149047 Heating/cooling based system for obtaining a disc drive servo signal  
A data storage medium such as a disc for a disc drive having a data signal layer configured for providing a data signal and a servo signal layer that includes first material a second materials...
7139152 Servo methods and systems using existing data structures and optical masks  
In one example, a method is provided for detecting the relative position of a transducer head with respect to a storage medium utilizing existing or previously written data structures on a magnetic...
7102845 Servo methods and systems using existing data structures and medium edge position  
The present invention provides servo systems and accompanying methods for determining the relative position of a transducer head to a magnetic storage tape utilizing existing data structures on the...
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...
7082006 Compact optical tracking system for magnetic tape  
A compact optical tracking system for magnetic tape is disclosed which is independent of the magnetic format and head structure which can generate a position error signal without encoding on the...
7075746 Disk drives and disk drive containing devices that include a servo frequency generator and spindle control timer that compensate for disk eccentricity  
A disk includes an actuator assembly, a spindle motor and a disk that defines a plurality of servo wedges. A wedge to wedge timer is configured to measure the time elapsed between at least two...
7064913 Enhanced read margining using dither enhanced write marginalization for mass data storage applications  
A recording target error rate is selected for one or more of data storage devices, and for each data storage device, a dither value is determined for each read/write head in the data storage...
7054095 Displacement detection apparatus, and magnetic recording apparatus and encoder using the displacement detection apparatus  
To detect the position of an object in a non-contact state at high reliability, high accuracy, and high resolving power, a linearly polarized light beam from a semiconductor laser source is...
7050259 High precision servo track writing with position error signal feedback  
A servo writer system for a disk drive uses the reader element of a magnetic transducer head in the disk drive to read head position information during servo writing of the disk drive. A...
7035038 Magnetic disk unit  
A disk-shaped magnetic recording medium having a reference track and a plurality of data tracks is rotated by a motor which generates an index signal at a predetermined position. A magnetic head is...
7035034 Data storage device, control device, off-track control method, and control method  
A hard disk device includes a servo control unit that constitutes a servo loop for a head seek for performing read/write of data from/to a recording medium, a correction signal generation unit for...
7012777 Disk drive with capacitance sensing of disk vibration and feedforward control for removal of read/write head track misregistration  
A data recording disk drive has a plurality of capacitive sensors, each sensor facing a surface of an associated disk, a capacitance sensing circuit for converting the sensed capacitance to a...
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...
6977791 Media servowriting system  
A system and methods for efficiently performing media writing functions is disclosed. The system and methods include: detecting media movement with respect to a base and heads during reading and...
6977786 Information recording method using a vertical magnetic system  
In an information recording method of the present invention by carrying out recording data while carrying out tracking servo accurately, high density recording of signals at a good S/N can be...
6963463 Rotational vibration velocity-based sensor for disk drives  
A disk drive (HDD) subject to linear and rotational vibration, includes an independent sensing unit for sensing a rotational velocity component of the HDD rotational vibration in a predetermined...
6961200 Optical servo track identification on tape storage media  
A method and a system for formatting a magnetic tape with identifiable optical servo tracks are disclosed. Multiple optically detectable servo tracks extending lengthwise parallel to the tape...
6940681 Optical to magnetic alignment in magnetic tape system  
A method of positioning a selected recording channel on a recording head relative to an optical servo system includes positioning the optical servo system at a first position relative to the...
6940678 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....
6940676 Triple push-pull optical tracking system  
A method of generating a composite signal in a closed loop servo signal system of a data recording system used to drive a recording head to any given position within a dynamic range of a servo...
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...
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...
6930850 Head clamping apparatus for magnetic disk tester and magnetic disk tester  
A magnetic disk tester has a head clamp (35, 218) to position a magnetic head (15, 289). The head clamp has a micromotion stage (55, 273) provided with a stage (59, 205) which is horizontally moved...
6924958 Read/write transducer for hard disk drives with optical position measuring system, and manufacturing process thereof  
Described herein is a read/write transducer for a hard disk drivewith dual actuation stage, comprising at least one hard disk and at least one suspension carrying the read/write transducer. The...
6922303 Reaction mass dual-stage actuator (DSA) and sensor  
A hard disk drive that has a reaction mass and a transducer that can be used to move and/or sense the acceleration of an actuator arm of the drive. The transducer is coupled to a disk controller...
6920010 Magnetic recording apparatus  
A magnetic recording apparatus which, even when crosstalk occurs between signals from three photosensitive parts of a photodetector, can detect a high-precision tracking error signal with...
6906485 Spindle motor control using a current profile to taper current transitions  
Method and apparatus for operating a motor. During a commutation state current is applied to a motor while field effect transistors (FETs) are held in an enable or disable state to effect current...
6898046 Method and system for rotational velocity-based algorithm for vibration compensation in disk drives  
A disk drive (HDD) (and method) subject to linear and rotational vibration, includes an independent sensing unit for sensing a rotational velocity component of the rotational vibration in a...
6888694 Active control system and method for reducing disk fluttering induced track misregistrations  
The present invention relates to controlling an actuator for positioning a read/write head in storage devices such as disk drives. More specifically, the invention relates to using a sensor to...
6853513 Magnetic scanning system  
A scanning device for scanning data-carrying disks. The disks include a magnetisable layer to and from which data is written and read using a magnetic transducer, such as a Giant Magneto-Resistive...
6829118 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...
6829115 Method and apparatus for measuring half frequency whirl in a spindle motor  
An apparatus and method of indirectly measuring half frequency whirl in a spindle motor having a rotor adapted to rotate a disc having a track which is followed by a transducer head that is...
6819520 Use of momentum transfer actuators for motion control of flexible mechanical structures  
This invention discloses a method for controlling the position of flexible portions of a mechanical structure by attaching one or more Momentum Transfer Actuators on the flexible portions of the...
6816334 Information recording and reproducing device and tracking servo system therefor  
An information recording and reproducing device includes a magnetic information detecting section for magnetically detecting magnetic information recorded at a given position on a recording medium,...
6798604 Controller circuit connectable to an actuator designed to position a head in a recording medium drive according to a filtered positioning control signal  
The controller circuit is designed to generate the positioning control signal based on the positional deviation of the head from a target recording track on a recording medium. A feedback control...
6791784 Diffraction-based monitoring of a patterned magnetic recording medium  
The diffraction-based monitoring techniques described herein can be used, for example, as quality assurance measure in manufacture of magnetic recording media with servo tracking. In one...
6781785 Method and system for utilizing circular marks in position error signal patterns  
Marks with curved edges are used in data patterns and sensed with proximity recording. Circular, elliptical, and oval marks are examples of marks with curved edges that can be used in the present...
6771454 Suspension sense capability for windage control  
A method and data storage device are provided that reduce off-track motion due to resonant modes in the storage device. The off-track motion is reduced by sensing movement with a sensor located on...
6768608 Multi-channel magnetic tape system having optical tracking servo  
A magnetic storage medium formed on a front major surface of a tape substrate defines a multiplicity of longitudinal data recording and playback tracks, each track having a nominal lateral location...
Matches 1 - 50 out of 235 1 2 3 4 5 >