197854 ⎘
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor; Disposition or mounting of heads relative to record carriers with provision for moving the head into or out of its operative position or across tracks; Track change, selection or acquisition by displacement of the head across disk tracks Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
Sub-classes:DATA STORAGE DEVICE WITH ASSISTIVE BURSTS IN SERVO SECTORS
#2SYMMETRICAL MAGNETIC HEAD AND MAGNETIC MEDIA FOR USE WITH SUCH HEAD
#3MAGNETIC TAPE REUSE ACROSS PRODUCTS
#4DATA STORAGE DEVICE WITH FLEXIBLE LOGICAL TRACKS AND RADIUS-INDEPENDENT DATA RATE
#5Tape Heads Having Tiered Servo Readers
#6DATA STORAGE DEVICE WITH FLEXIBLE LOGICAL TRACKS AND RADIUS-INDEPENDENT DATA RATE
#7MAGNETIC DISK DEVICE AND REFRESH PROCESSING METHOD
#8Magnetic disk device and method
#9Data storage device with flexible logical tracks and radius-independent data rate
#10Removable disk clamp for read-write device in archival data storage library
#11Data storage device with soft on-disk activation of fine actuators
#12Removable disk clamp for read-write device in archival data storage library
#13Write timing for RRO field in a constant density servo system
#14Data storage device demodulating digital data based on number of servo stripes in servo frame
#15Write timing for RRO field in a constant density servo system
#16MAGNETIC DISK DEVICE AND WRITE RETRY PROCESSING METHOD
#17Magnetic disk device and write processing method
#18MANUFACTURING METHOD OF MAGNETIC DISK DEVICE AND MAGNETIC DISK DEVICE
#19Dual state actuators controlling for magnetic recording device
#20Calibrating elevator actuator for disk drive
#21Magnetic disk device and write processing method
#22Actuator assembly having dual sensors for detecting the vibration on magnetic disk device
#23Data-center drive with split-actuator that increases read/write performance via data striping
#24Actuator assembly having dual sensors for detecting the vibration on magnetic disk device
#25Magnetic disk controlling device capable of tracking different servo pattern frequencies
#26Magnetic tape device and head tracking servo method
#27Magnetic Recording Method
#28Method and apparatus for caching data in an solid state disk (SSD) of a hybrid drive that includes the SSD and a hard disk drive (HDD)
#29Magnetic disk device, controller, and method
#30Disk device with stopper for movable member
#31Magnetic tape device and head tracking servo method
#32Disk device with stopper for movable member
#33Write head offset for shingled magnetic recording (SMR) disk drives
#34Enlarged substrate for magnetic recording medium
#35Enlarged substrate for magnetic recording medium
#36DATA STORAGE DEVICE CONCURRENTLY CONTROLLING AND SENSING A SECONDARY ACTUATOR FOR ACTUATING A HEAD OVER A DISK
#37Enlarged substrate for magnetic recording medium
#38Adaptive disturbance rejection using dead zone filter
#39DISK DRIVE, CONTROL METHOD THEREOF, AND DRIVER IC
#40Magnetic disk device and determining method of crossing a zone boundary
#41Enlarged substrate for magnetic recording medium
#42Enlarged substrate for magnetic recording medium
#43Servo tracking using a single servo writing pass per track for multi sensors
#44Semiconductor integrated circuit and operating method for the same
#45Read channel sampling utilizing two quantization modules for increased sample bit width
#46Servo channel with equalizer adaptation
#47Adaptive guard band for multiple heads of a data storage device
#48Magnetic storage medium comprised of magnetic nanoparticles contained within nanotubes
#49Actuator driver
#50Plastic critical tolerance fit component
#51Dynamic guarding of a storage media
#52Disk storage device, controller of the same, controlling method performed by the same, and electronic device
#53Motor drive circuit
#54MAGNETIC RECORDING APPARATUS
#55Hard disk drive, method for estimating back electromotive force, and method for controlling velocity of head
#56Device for accessing address information in an optical disc
#57Magnetic and optical rotating storage systems with audio monitoring
#58Reducing the obstruction of air flow through a bypass channel associated with a disk drive using an electrostatic pass-by filter
#59INK EJECTION DEVICE EMPLOYING CORRUGATED THERMAL ACTUATOR
#60Log-structured file system for disk drives with shingled writing
#61Disk drive and error-recovery processing method
#62VCM driver and PWM amplifier
#63Quiet retraction system
#64Method of determining the gain of a BEMF amplifier and relative control circuit of an induction electric motor
#65METHOD AND APPARATUS FOR OFFSET CONTROL IN A DISK DRIVE
#66Apparatus and method for adjusting a feed-forward signal for seek control during a seek operation
#67System and method of current shaping control for retract
#68METHOD OF DETECTING POSITION OF HEAD AND STORAGE APPARATUS
#69HEAD POSITIONING CONTROL METHOD, MAGNETIC DISK APPARATUS AND FEEDBACK CONTROL METHOD
#70Data storage apparatus
#71Efficient method to detect disk write errors
#72Method and apparatus for offset control in a disk drive
#73Correcting a track pitch error with a subsequent servo-write pass
#74MOUNTING METHOD FOR STORAGE MEDIUM
#75High aspect ratio motion limiter of a microactuator and method for fabrication
#76Discontinuous mode back EMF measurement
#77VCM driver and PWM amplifier
#78Corrugated thermal actuator
#79Angular and radial location determination in a control system
#80Data storage device
#81Magnetic disk apparatus and magnetic head control method
#82Magnetic disk drive with head retraction control
#83REDUNDANT DATA ON HARD DRIVE
#84Overmolded motor hub
#85Outer actuator arm constrained layer dampers
#86Mapping defects on a data wedge basis
#87Detecting head-disk contact during off-track operations
#88Selectively inhibiting transducer output responsive to detected jerk
#89STORAGE DISK DRIVING APPARATUS FOR DRIVING A STORAGE DISK AND A CASE THEREFOR
#90Head position control device and medium storage device
#91Method and apparatus for controlling the movement of a head in a disk drive
#92Multiple sinusoidal seek servo system for reducing seek acoustics and seek time in hard disk drives
#93Self-tuning settle controller in hard disk drives
#94Two degree of freedom position control method, two degree of freedom position control device, and medium storage device
#95Control device, storage device, storage medium, servo data demodulation method, repeatable velocity error measuring device, and computer product
#96Feedforward controller and methods for use therewith
#97Back electromotive force (BEMF) calibration method, method of controlling unloading of disk drive apparatus using BEMF calibration method, and disk drive apparatus using the same
#98High bandwidth data transfer to and from rotating data storage devices
#99Magnetic and optical rotating storage systems with audio monitoring
#100Magnetic and optical rotating storage systems with audio monitoring
#101Magnetic and optical rotating storage systems with audio monitoring
#102Head stack assembly having a head gimbal including a recessed flexure and hard disk drive including the same
#103Reducing the obstruction of air flow through a bypass channel associated with a disk drive using an electrostatic pass-by filter
#104Reducing the obstruction of air flow through a bypass channel associated with a disk drive
#105Methods and apparatuses for measuring VCM BEMF at a VCM control update rate
#106Method for manufacturing a magnetic head arm assembly (HAA)
#107Control device and storage device
#108Feedforward controller and methods for use therewith
#109Actuator bearing having non-uniform ball spacing
#110Magnetic disk drive and a loading/unloading method
#111Magnetic disk drive with controlled transducer movement during a seek
#112Adaptively adjusting seek function control parameters based on off-track write events
#113Disk drive and control method therefor
#114Differential voice coil motor control
#115On-chip compensation for a fully differential voice coil motor control
#116HARD DISK DRIVE DEVICE AND METHOD OF ASSEMBLING THE HARD DISK DRIVE DEVICE
#117Method of controlling movement of a transducer and disk drive using same
#118Off track write protection using filtered position error signal
#119Disk drive that controls heater current according to rotational speed
#120Storage apparatus, seek control method and program
#121Magnetic disk devices with data recording areas set separately for each device
#122Optical information recording apparatus
#123Magnetic head and disk X-Y test assembly with optimized arrangement for skew angle
#124Method of coupling a voice coil motor to a base plate of a hard disk drive
#125Magnetic disk drive with head retraction control
#126Quiet movie playback for entertainment PC
#127Control system of motors for rotating a disk and for positioning heads of a mass storage disk device
#128Adaptive voltage-mode controller for a voice coil motor
#129Carriage arm assembly for locating magnetic head, and magnetic disk apparatus using the same
#130Motor drive and magnetic disc apparatus
#131Control circuit for information storage device
#132Driving method
#133Optical pickup and optical disc apparatus provided with the same
#134Staurosporine derivatives for hypereosinophilic syndrome
#135Optical disc drive focusing apparatus
#136Disk drive apparatus
#137Yoke for voice coil motor in recording disk drive
#138Method of forming a support structure
#139Motor driver and magnetic disc apparatus
#140Spindle speed control using feed-forward estimation in a hard disk drive
#141Carriage arm assembly for locating magnetic head, and magnetic disk apparatus using the same
#142Hard disk drive device and method of assembling the hard disk drive device
#143Manufacturing method of a disk drive unit
#144Bearing mechanism for head used in magnetic disk drive and magnetic disk drive having the same
#145Device for accessing address information in an optical disc
#146Disk drive, and actuator and head actuator assembly
#147Connection structure for actuator and flexible printed circuit of hard disk drive
#148Head stack assembly incorporating a pivot assembly having solid lubrication
#149Method, medium, and apparatus controlling track seek in a recording and/or reproducing apparatus
#150High bandwidth data transfer to and from rotating data storage devices
#151Arm chamfer for comb type actuator in rotating disk storage device and carriage assembly
#152Flexible data TPI in hard disk drives
#153Generalized sinusoidal trajectory for seek servomechanism of hard drives
#154Magnetic disk storage system
#155Disk drive device
#156Apparatus and method to improve read/write speed of disk drive system
#157Servo controller in magnetic disk drive
#158Magnetic head device
#159Information recording and reproducing apparatus with power supply voltage monitoring function
#160Data storage device and data storage device control
#161Data recording system with servo pattern having pseudo-random binary sequences
#162Acquiring values of back electromotive force for an electric motor
#163Recording disk drive
#164Positioner for positioning head on a disk
#165Carriage arm assembly for locating magnetic head, and magnetic disk apparatus using the same
#166Thermal actuators
#167Actuator assembly and rotating disk storage device with efficient voice coil shape
#168Endcap for reducing airflow excitation of head gimbal assembly
#169Variable frequency chevron in printed media reference pattern to improve servo demodulation
#170Track zero determination method used in data storage system and disk drive using the same
#171Data storage device with support for wiring structure portion to suppress fluttering
#172System and method for optimizing track spacing across a stroke
#173Disk apparatus
#174Method and apparatus for head control, and disk-drive apparatus
#175Method and apparatus mapping logical tracks in a disk drive for optimizing track seek time
#176Spindle motor and recording disk driving device comprising the same
#177Method and apparatus for compensating for torque change in seek servo
#178Magnetic disk devices with data recording areas set separately for each device
#179Master medium for magnetic transfer and magnetic disk and magnetic disk drive
#180System module
#181Acceleration sensor and disk drive employing it
#182Information recording medium
#183Actuator with dynamic characteristic and a four section VCM coil and disk drive having the same
#184Storage medium and method for actuator movement control
#185Distributed damper for data storage devices
#186Deceleration of head in disc drive according to a desired deceleration profile
#187Log-structured file system for disk drives with shingled writing
#188System and method for writing HDD depending on direction of head skew
#189Enhancing optical density
#190Laser-welded actuator assembly
#191Digital actuator control and method
#192Optical disc drive focusing apparatus
#193Selecting physical cylinders in a disc drive employing discs with pre-written servo patterns
#194Motor torque variation compensation
#195Method and system for reducing power consumption in a rotatable media data storage device
#196Direct detection of coil resistance
#197Magnetic disk apparatus
#198Spindle motor for hard disk drives
#199Multi-sector read offset recovery
#200Data storage device employing staggered servo wedges to increase capacity
#201Hard disk access using multiple actuators
#202Multi-actuator storage device access using logical addresses
#203Data storage device capable of overriding a servo command to avoid an overcurrent condition
#204Multi-controller data storage devices and methods
#205Calibrating elevator actuator for disk drive
#206Disc locked clock-based servo timing
#207Head with multiple readers configured for reading interlaced magnetic recording tracks
#208Sensor circuit supporting multiple transducers with dedicated and shared terminals
#209Data storage drive with low-latency ports coupling multiple servo control processors
#210Data storage device comprising extended servo burst field over part of a disk surface
#211Disturbance compensation for dual-stage servo system using vibration sensor
#212Bidirectional shingled magnetic recording in a heat-assisted magnetic recording device
#213Single writer interlaced magnetic recording
#214Anti-reflection waveguide for heat-assisted magnetic recording
#215Data storage device concurrently controlling and sensing a secondary actuator for actuating a head over a disk
#216Data storage device executing retry operation by buffering signal samples at different radial offsets
#217Disk drive slider with sense amplifier for coupling to a preamp through a supply/bias line and a read signal line
#218Electronic system with media maintenance mechanism and method of operation thereof
#219Data management for data storage device with different track density regions
#220Data storage device comprising slew rate anti-windup compensation for microactuator
#221Sector-based write operation
#222Reducing acoustic noise in a disk drive when exiting idle mode
#223Disk drive actuating first head microactuator while sensing signal from second head microactuator