|
Match
|
Document |
Document Title |
|
|
7375915 |
Disk drive that varies the power to a slider mover during transitions between drive operations
A disk drive for storing data includes a drive housing, a storage disk that is rotatably coupled to the drive housing, a slider assembly positioned near the storage disk, and a drive circuitry. The...
|
|
|
7369351 |
Magnetic disk drive and read/write method to reduce read error rate
Embodiments of the invention reduce the error rate of a read error that is caused by a spacing interval between a write head and a read head, which are formed on a slider. In one embodiment, a...
|
|
|
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...
|
|
|
7362536 |
Disk drive that compensates for phase incoherence between radially adjacent servo tracks and methods thereof
Methods of compensating for radial incoherence in servo information that is read from adjacent servo tracks that have a phase offset relative to one another on a data storage disk of a disk drive...
|
|
|
7342737 |
Off track write protection using filtered position error signal
Methods of filtering a position error signal (PES) indicative of a position of a transducer of a disk drive include obtaining sample position data for the transducer, eliminating selected data of...
|
|
|
7333287 |
Head position control method and disk apparatus
A head position control method controls a position of a head of a first apparatus with respect to a disk which has been formed with a track and has been recorded with servo information including...
|
|
|
7333285 |
Method of and apparatus for detecting actuator vibration in hard disc drive, and hard disc drive write control method of avoiding effect due to read/write head vibration
A method of and an apparatus for detecting an actuator vibration, and a hard disc drive write control method of avoiding an effect due to the actuator vibration. The method of detecting an actuator...
|
|
|
7330330 |
Systems for self-servowriting in multiple portions with multiple passes per servowriting step
The amount of position error written into a servo burst pattern can be reduced by using additional media revolutions to write the pattern. Where servo bursts are used to define a position on the...
|
|
|
7330321 |
Reference magnetic signal recording device and method of manufacturing the same
A method of simultaneously recording multiple reference magnetic signals by using a magnetic head having multiple recording portions is provided. A writing yoke formed of a ferromagnetic material...
|
|
|
7319570 |
Random vibration and shock compensator using a disturbance observer
A data storage device adapted to compensate for physical disturbances has a storage medium, a read-write mechanism positionable relative to the storage medium, and a disturbance observer. The...
|
|
|
7315433 |
Non-repeatable run out compensating apparatus and method and disc drive using the same
An apparatus and method are provided for quickly and finely compensating for non-repeatable run out (NPRO) of a disc drive. The NPRO compensation control apparatus in a run out compensation...
|
|
|
7301720 |
Method of determining and applying adaptive track zero position and disc drive using the same
A method of determining, and an apparatus to determine, a track zero position of a disc in a disc drive, the method including seeking, sequentially, in units of predetermined numbers of tracks,...
|
|
|
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...
|
|
|
7289288 |
Disk drive having hybrid spindle speed control and related method
A disk drive is disclosed having hybrid spindle speed control. The disk drive includes a disk having a plurality of servo wedges, and a spindle motor for rotating the disk at an operating speed....
|
|
|
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...
|
|
|
7277503 |
Apparatus and method for synchronizing sampling frequency and carrier frequency in a multi-carrier communication system
An apparatus and method for synchronizing sampling frequencies of a receiver and a transmitter of a multi-carrier communication system is provided. The receiver includes an estimator for estimating...
|
|
|
7277250 |
Track zero determination method used in data storage system and disk drive using the same
An optimal track zero determination method used in a hard disk drive and a hard disk drive using the method. The method has the operations: (a) performing a sequential seek operation on target...
|
|
|
7271977 |
Method to compensate for microjog error induced by localized track squeeze
A method of reducing microjog errors in a disk drive having a data recording disk with data tracks and a transducer head positionable on the tracks. The head includes a writer element offset from a...
|
|
|
7271974 |
Method of self servo write with low density gas
Embodiments of the invention provide a disk device capable of writing highly accurate servo data using an extremely simple technique, and a manufacturing method therefor. According to one...
|
|
|
7268968 |
Vibration suppression for servo control
Embodiments of the present invention provide a way to modify the controller of a HDD head actuator to increase the error rejection capability and suppress the wideband vibration that affects the...
|
|
|
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...
|
|
|
7262931 |
Disk drive using magnetic disk medium of discrete track recording
A magnetic disk medium of a discrete track recording (DTR) structure and a disk drive using the magnetic disk medium are disclosed. The magnetic disk medium of the DTR structure has...
|
|
|
7253987 |
Disturbance signal reduction in servo systems
A servo system includes a first member and a second member that is positionable relative to the first member. A position error signal causes the second member to be positioned at a desired location...
|
|
|
7245451 |
Methods using extended servo patterns with variable multi-pass servowriting and self-servowriting
The amount of position error written into a servo burst pattern can be reduced by using additional media revolutions to write the pattern. Where the edges of two servo bursts are used to define a...
|
|
|
7245447 |
Magnetic read/write apparatus having a write inhibit slice setting circuit
A magnetic read/write apparatus comprises: a recording medium; and a head for writing/reading data to/from each sector on the recording medium; wherein the magnetic read/write apparatus further...
|
|
|
7242550 |
Magnetic disk apparatus suppressing adjacent track influence
A magnetic disk apparatus is configured such that a physical track number is converted into an absolute track number by making a track pitch in an absolute track area formed by a given magnetic...
|
|
|
7236321 |
Method for preventing data loss in a hard disk drive by projecting reduction in helium concentration using insitu non-repeatable runout
A method for preventing data loss in a hard disk drive by projecting reduction in gas concentration using insitu non-repeatable runout is disclosed. The method includes using servo tracking error...
|
|
|
7215494 |
System and method for performing adaptive read retry operations in a data storage device
A system and method for performing read retry operations with respect to an erroneously read data sector is disclosed. The system and method use estimates of bit error rates determined during...
|
|
|
7212371 |
Storage device and its control method and manufacturing method
A storage device, which comprises a storage media, a spindle motor which spins the storage media, a head unit which records and reads the data to the storage media, an actuator which carries out...
|
|
|
7212364 |
Servo writing a disk drive by synchronizing a servo write clock in response to a sync mark reliability metric
A method of writing product servo sectors to a disk of a disk drive is disclosed. A plurality of spiral tracks are written to the disk, wherein each spiral track comprises a high frequency signal...
|
|
|
7206160 |
Method and apparatus of micro-actuator control of the flying height of a read/write head in a hard disk drive
Read-write head flying height controlled through micro-actuator assembly. Flying height controlled using DC line and ground line. Lateral position controlled using them and AC line. Micro-actuator...
|
|
|
7203022 |
Disk device, and positioning control method and signal-processing circuit for head
Embodiments of the invention eliminate noise from burst signals by use of a reliable and simple method. In one embodiment, the read processor of the HDD has a noise elimination circuit. The noise...
|
|
|
7203018 |
Servo writer with clamping push pin
A servo writer that uses a clamping push pin is disclosed. The clamping push pin includes a first clamping member that is movable relative to a second clamping member. The first clamping member is...
|
|
|
7190546 |
Systems using extended servo patterns with variable multi-pass servowriting and self-servowriting
The amount of position error written into a servo burst pattern can be reduced by using additional media revolutions to write the pattern. Where the edges of two servo bursts are used to define a...
|
|
|
7173781 |
Multi-tracks MR offset tuning based on error count in certification process
Embodiments of the present invention include a method and an apparatus for generating an optimal MRO for a zone having a plurality of tracks. A disc drive controller determines the optimum MRO of a...
|
|
|
7158335 |
Method for resonance identification in hard disk drives
A hard disk drive that redefines a notch filter of the drive. The update process may include initially disabling all notch filters and inducing a seek operation of the disk drive heads. A position...
|
|
|
7158334 |
Method and apparatus for head positioning control with disturbance compensation in a disk drive
A head positioning control system which is applied to a disk drive is disclosed. The system includes a feedback control system which performs head positioning control of a head and a feedforward...
|
|
|
7158333 |
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...
|
|
|
7158330 |
Method and apparatus for servo track writing by track following on a dedicated servo disk on a fluid spindle bearing
What is disclosed is a method and apparatus for writing servo information on disks to be used in a hard disk drive assembly. In one embodiment, servo information is pre-written onto a disk using an...
|
|
|
7154699 |
High bandwidth large stroke spin-stand
A high bandwidth, large stroke spin-stand for testing components of a disc drive includes a coarse positioning stage and a rotary micropositioning stage. The spin-stand is capable of positioning a...
|
|
|
7151645 |
Interleaved repeatable runout estimation
A method and apparatus for reducing the effects of non-repeatable runout (NRRO) in the estimation of repeatable runout (RRO) in a disc drive is disclosed. PES information is a acquired in a way...
|
|
|
7149044 |
Methods, apparatus and computer program products for writing tracks on a disk based on an available stroke
Track pitch for writing tracks on a disk is determined based on an available stroke across the disk. The available stroke is identified by searching across the disk for where information can be...
|
|
|
7142387 |
Method and apparatus positioning a read head to follow a track in a hard disk drive
Read positioning method includes adjusting at least one read head position when accessing read track on at least one rotating disk surface based upon Burst Correction Value of nearest write track,...
|
|
|
7139149 |
Adapting compensation for repeatable runout of sectors based on tracked sector adaptation status
Methods, servo controllers, disk drives, and computer program products are provided for adapting compensation for repeatable runout (RRO) of sectors of a disk in a disk drive. RRO of a plurality of...
|
|
|
7136251 |
Methods for WORF improvement in conditional servowriting
To account for head misplacement while servowriting, adjustments to thresholds used during writing and/or trimming of servo information can be used. A threshold can be used to disable servowriting...
|
|
|
7136249 |
Positioning device
A positioning device includes a swiveling shaft, at one end of which an element to be positioned may be attached, a swivel drive, made up of a rotor, which is movable relative to a stator, a...
|
|
|
7136245 |
Disk device
A disk device performs position control of a head. An acquiring unit acquires correction information and check information from a disk for checking the correction information. A judging unit judges...
|
|
|
7126785 |
Multi-stage actuator disk drives, methods, and computer program products for seeking and then maintaining a transducer on track
Disk drives, methods, and computer program products are provided for controlling seeking of a transducer that is adjacent to a rotatable data storage disk in a disk drive. The disk drive includes a...
|
|
|
7116513 |
Positioning transducers based on a compensation scheme that varies based on transducer vibrational state
A disk drive includes a transducer and a rotatable disk, which includes a plurality of tracks. A vibration state of the transducer relative to the disk is determined. The transducer is positioned...
|
|
|
7106540 |
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...
|