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Match Document Document Title
7385777 Data storage device with heater, and control method therefor with timing control  
Embodiments of the invention reduce a possibility that a head will collide with a medium when the clearance between the head and the medium is adjusted by using a medium, and sufficiently reduce...
7382566 Magnetic disk protection mechanism, computer system comprising protection mechanism, protection method for magnetic disk, and program for protection method  
A mechanical transport device includes a system for transport; and a hard disk drive attached to the system. The hard disk drive comprises a magnetic recording disk to record data, a head to read...
7382563 Storage apparatus, and control method and program  
Upon obtaining a detection signal of a shock sensor that detects a shock applied to an apparatus for output, a write disabling unit disables writing by a head on a medium over a predetermined time...
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...
7375917 Idle seek calibration method for magnetic disk drive and magnetic disk drive with an intermission calibration  
When an idle seek operation of a magnetic disk drive is executed under a velocity control utilizing a back electromotive force of a VCM actuator, the accuracy of the velocity control is...
7372660 Disc storage system with adaptive PID control  
A disc drive controller circuit for an actuator receives reference data indicating a desired actuator position “θ d ”, error data indicating a difference “e” between the desired actuator...
7369349 Data storage device with heater, and control method therefor involving different control modes  
Embodiments of the invention reduce a possibility that a head will collide with a medium when the clearance between the head and the medium is adjusted by using a medium, and sufficiently reduce...
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...
7362539 Disk drive and method of controlling the same  
Embodiments of the invention provide a disk drive capable of preventing the deterioration of performance. In one embodiment, a disk drive includes a disk medium; a head capable of performing a...
7362538 Torque constant correction method in multiple sinusoidal seek servo and disk drive using the same  
A disk drive control method and apparatus. In particular, a torque constant correction method and apparatus in a disk drive using a multiple sinusoidal seek servo scheme. The torque constant...
7362534 System for detecting a change in head-to-disk contact status in a disk drive  
A disk drive includes a rotatable storage disk, an actuator motor, a slider that magnetically interacts with the storage disk, and a drive circuitry. A portion of the slider moves between a first...
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...
7352527 Disk drive that balances seek speed and seek acoustics  
A disk drive selects seek speed and seek acoustics based on a history of seek requests from a host computer. The history of seek requests can include time intervals between seek requests, seek...
7349173 Self-tuning settle controller in hard disk drives  
A hard disk drive with a voice coil motor controlled by a circuit. The circuit provides a driving current to the voice coil motor to move a head of the drive in a seek routine. The seek routine...
7342739 Method, medium, and apparatus compensating for torque variations based on temperature  
A method, medium, and apparatus controlling a hard disk drive, and particularly, embodiments include methods, media, and apparatuses compensating for torque variations with respect to temperature...
7339761 Method for wedge time shift calibration in a disk drive  
A method is disclosed for identifying wedge time shift zones on a magnetic disk of a disk drive. The disk drive further includes a spindle motor for rotating the disk at an operating speed in...
7333289 Magnetic recording and reproducing apparatus, method of controlling the same, magnetic recording medium, and stamper for manufacturing magnetic recording medium  
A magnetic recording and reproducing apparatus and a method of controlling the same, capable of increasing the output of a position control signal and performing a precise positioning control of a...
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...
7324300 Head position control method, head position control device and disk device  
A head position control device controls the position of a head with respect to a disk where post code is assigned to a servo frame. Servo frames of a disk is constituted by a servo frame not having...
7324299 Disk drive that positions a head at multiple head-to-disk spacings  
A disk drive having a drive housing, a storage disk that is rotatably coupled to the drive housing, and a slider assembly that includes a head and a slider mover. The head reads data from the...
7321477 Disk control apparatus, disk control method, and computer product  
A disk control apparatus controls a disk driving unit that performs read/write of data with a head. A vibration detecting unit detects a vibration of the disk driving unit. A disk control unit...
7317591 Servo control for magnetic disk drive  
Embodiments of the invention provide a magnetic disk drive that exhibits excellent overall stability of a feedback control system even when the preset frequency for a peak filter significantly...
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...
7310195 System and method for adjusting head-to-disk spacing in a disk drive  
A disk drive includes a drive housing, a storage disk, a slider and a drive circuitry. The storage disk has an inner and an outer diameter. The slider includes a read/write head and a slider mover...
7304819 Method for writing repeatable runout correction values to a magnetic disk of a disk drive  
A method is disclosed for writing repeatable runout (RRO) correction values to a disk of a disk drive. The disk has distributed position information in a plurality of embedded servo sectors. The...
7301722 Wave torque retract of disk drive actuator  
A disk drive actuator circuit adapted to retract a head assembly when a capacitor discharges energy to the voice coil. This voltage may be modulated to deliver peak torque to get the actuator over...
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,...
7298574 Servo writing a disk drive using correction values that attenuate phase error propagation  
Servo writing a disk of a disk drive is disclosed. A phase locked loop (PLL) is synchronized to first sectors previously written on a first track, and second sectors are written to a second track...
7295396 Magnetic disk drive  
Embodiments of the present invention reduce noise and residual vibration during random access operation of a magnetic disk drive. The magnetic disk drive which executes each instruction from an...
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...
7289291 Disk drives and methods allowing for super silent seeks  
A disk drive includes a disk, a head, an actuator, and a servo controller. The servo controller controls a movement of the actuator based on a super silent seek profile to cause the actuator to...
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....
7286316 Method and data storage device for writing patterns onto recording disk  
Embodiments of the invention efficiently conduct servo corrections for preventing error propagation during SSW. In an example of the present invention, a servo position signal generator generates a...
7280309 Access performance adjusting method and storage apparatus  
An access performance adjusting method is adapted to a storage apparatus having a storage to prestore a skew quantity that is used to shift a data write starting position of each track of a...
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...
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...
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...
7274530 Logical mapping for improved head switching between corresponding tracks in a data handling device  
In a data handling system having a radially-dependent track incongruity between data surfaces, at least some tracks are logically mapped so that tracks on different data surfaces correspond with...
7274527 Method for optimizing dynamic stroke in the self servo-write process  
Methods in accordance with embodiments of the present invention can be applied to determine a width of a data stroke along a rotatable medium of a data storage device. In one embodiment, the width...
7268969 Repeatable timing mark position error correction in self-servowrite  
The periodic component of a timing mark position error of a self-servo write pattern on a disk of a disk drive is determined based on measurements that are made of the timing mark position error at...
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...
RE39809 Hard sectoring circuit and method for a rotating disk data storage device  
An apparatus for providing sector location pulses to a controller of a rotating disk data storage device having a counter clocked in proportion to the disk rotation rate and an accumulator for...
7265933 Disk drive computing repeatable run out while actuator arm is pressed against crash stop  
A disk drive is disclosed comprising a voice coil motor (VCM) for rotating an actuator arm about a pivot in order to actuate a head over a disk. The disk is rotated by a spindle motor, and a...
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...
7259534 Method for controlling spindle motor by time length for passing through defect  
A method of use a defect measure to control spindle motor is described. A system gets the defect situation from a CD by referring a maximum time of pass through the defect and a total time of pass...
7253989 Disk drive compensation of bias imparted by a flex circuit cable utilizing a dual bias curve estimation scheme  
A disk drive comprising an actuator including a head, a disk, and a processor connected to the actuator by a flex circuit cable. The processor under the control of a program to: apply a control...
7253981 Disc drive with reduced write latency  
A disc drive with a disc having multiple concentric data tracks. A track start point is rotationally displaced by a track skew time relative to a track start point of an adjacent concentric data...
7245452 Disk drive with altitude detection via analysis of non-repeatable runout components  
A controller for a disk drive measures track misregistration, extracts non-repeatable runout from measured track misregistration, determines one or more components of non-repeatable runout at...
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...
7230784 High bandwidth data transfer to and from rotating data storage devices  
A method of transferring data of one or more rotatable data storage devices includes but is not limited to rotating the at least one rotatable data storage device; transferring the data between a...
Matches 1 - 50 out of 737 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >