Matches 1 - 50 out of 536 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
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,...
7292404 Signal reproducing method and storage apparatus  
A signal reproducing method reproduces servo information recorded on a recording medium by use of a head. A current calculation related to a current and an observer calculation related to a...
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...
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...
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...
7106537 Disk drive using a timer to arbitrate periodic serial communication with a power driver  
A disk drive is disclosed comprising a microprocessor and a power driver for generating at least one actuator signal applied to the VCM actuator, wherein a serial communication circuit is used to...
7102847 Identification of laterally positioned servo bands employing differentiating characteristics of servo patterns  
In a tape having separate servo bands of patterns positioned laterally across the tape, the patterns of a separate servo band have at least one differentiating characteristic with respect to...
7092197 Rejection of power supply variations for gain error cancellation in pulse-width-modulated motor controllers  
A positioning driver ( 32 ) for a voice coil motor ( 22 ) in a disk drive system ( 10 ) is disclosed. Pulse-width-modulated prestage drivers ( 46 ) are coupled to power transistors ( 50 ) arranged...
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...
7088535 Off-track retry method in hard disk drive  
An off-track retry method for recovering data incorrectly read due to a read error caused by an off-track error in a disk drive. The off-track retry method includes extracting read gain...
7085084 Magnetic disk apparatus and servo pattern recording method therefor  
A magnetic disk apparatus and a servo pattern recording method therefor, enabling writing of servo signal with high quality, without being affected with ill influences due to fluctuation on a...
7082007 Method to achieve higher track density by allowing only one-sided track encroachment  
A disc drive includes a transducer having a separate element for writing information and a separate element for reading information to and from the disc. In a disc drive designated to read and...
7057843 Disk drive control circuit and method  
A servo control circuit provides seamless transition between seek and track modes while enabling both rapid seek mode operation and accurate tracking. The control circuit includes an...
7054094 Real-time automatic loop-shaping for a disc drive servo control system  
An apparatus and method for improving servo loop performance in a disc drive storage system are provided. The servo loop includes a voice coil motor actuator that moves the head in response to a...
Matches 1 - 50 out of 536 1 2 3 4 5 6 7 8 9 10 11 >