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7382570 Dynamically controlling seek profile in an acceleration tracking seek controller  
Methods of controlling seeking of a transducer that is adjacent to a rotatable disk in a disk drive are disclosed. The methods may include accelerating the transducer radially across the rotatable...
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...
7369352 Apparatus, medium, and method with seek servo control considering temperature change  
An apparatus, medium, and method to control a disk drive, and in particular, an apparatus, medium, and method controlling a disk drive to perform a seek mode at an optimum state with respect to an...
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...
7359141 Servo control method, apparatus using the same, and recording medium having program for executing the method  
The sequential seek method includes calculating a seek length by comparing a cylinder number of a current track with a cylinder number of a target track; checking if the seek length corresponding...
7359140 Method and apparatus of acceleration-based track seeking servo control of disk drive  
A method and apparatus directed to acceleration-based track-seeking servo control of a disk drive, which minimize jerk generated at the start and end of track seeking, thereby reducing mechanical...
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...
7349171 Method for measuring actuator velocity during self-servo-write  
A system comprises a positioning module, a frequency measuring module, a simulation module, and a control module. The positioning module positions an actuator arm adjacent to a track to read...
7333292 Seek servo control method for adapting to supply voltage variation and disk drive using the same  
A seek servo control method and device for a disk drive device for performing seek servo control according to a variation in a power supply voltage for the disk drive. The seek servo control method...
7315432 Track-seek control method of HDD and recording medium suitable for the same  
A seek control method of smoothly changing to a coast mode and a deceleration mode in a track-seek control device according to a multi-sinusoidal acceleration trajectory, a recording medium...
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...
7289290 Method of controlling track seek servo in disk drive and apparatus therefor  
A method of controlling a track seek servo in a hard disk drive and an apparatus therefor. A method of controlling a track seek servo includes moving a transducer to a track with an acceleration...
7287315 Apparatus for measuring slider mounting position in magnetic head, and magnetic head manufacturing system using the measurement apparatus  
The present invention provides a measurement apparatus for obtaining a suitable position on a suspension where a more miniature magnetic head slider is to be mounted to the suspension, the...
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...
7259933 Velocity control system for an actuator assembly  
A method for generating a velocity command for an actuator assembly is provided. The actuator assembly includes an actuator arm, which is to move over a plurality of surfaces. The method begins by...
7253581 Data storage device, motor control device, and motor control method  
Embodiments of the invention provide a way to accurately detect the position of a spindle motor. In a spindle motor startup process according to one embodiment, a parameter setup section acquires...
7248429 Adaptive settling control method and apparatus in track seek mode of disc drive  
A settling control method and apparatus perform an improved settling control regardless of a seek distance when a disc drive track seek control operation is performed. An adaptive settling control...
7248428 Method, medium, and apparatus controlling track seek in a recording and/or reproducing apparatus  
A method, medium, and apparatus controlling a hard disk drive, and more particularly, a method, medium, and apparatus controlling a track seek of a hard disk drive, where the hard disk drive...
7248427 Method and apparatus for reducing velocity errors when writing spiral servo information onto a disk surface  
The present invention is directed to a method and apparatus for reducing velocity errors when writing spiral servo information onto a disk surface of a disk drive. In one embodiment, a servo track...
7215503 Time linear arrival for velocity mode seeks  
A method, computer program product, and apparatus for controlling the arrival of a disc drive actuator arm assembly using a time-linear arrival profile are disclosed. A reference velocity is...
7209304 Systems, apparatus, and methods to determine thermal decay characterization from an equalized signal-to-noise ratio of a magnetic disc drive device  
The thermal decay of data written to a magnetic mass storage medium is determined by measuring and analyzing the time-domain equalized-signal-to-noise ratio (ESNR) and equalized...
7208898 Near time-optimal jerk trajectory for positioning a control object  
Method and apparatus for control object manipulation from an initial position to a final position. A jerk control profile describes a near time-optimal jerk trajectory for the control object and...
7203028 Settling servo control method and apparatus for hard disc drive and method and apparatus for estimating acceleration constant of voice coil motor actuator suitable for the settling servo control method and apparatus  
A fast settling servo control method and apparatus for a hard disc drive and a method and apparatus estimate an acceleration coefficient of a voice coil motor (VCM) actuator suitable for the...
7199966 Disk drive adjusting seek profile for variable seek times to reduce power dissipation  
A disk drive is disclosed comprising a disk having a plurality of tracks, a head actuated over the disk, and a voice coil motor for seeking the head from a first track to a second track. A first...
7110214 Disk drive to implement a seek operation utilizing a deceleration velocity profile that mathematically models BEMFs  
Disclosed is a disk drive including an actuator having a coil, a head attached to the actuator, and a disk including at least a first track and a second track, and a processor for controlling...
7110213 Positioner for positioning head on a disk  
A drive current output unit outputs a drive current to an actuator, for moving a head to an intended position on a disk. A drive current adjusting unit adjusts the drive current based on a speed of...
7082010 Method and apparatus for reducing seek acoustics in a disk drive using feedback during large current transitions  
A method and apparatus for reducing seek acoustics in a disk drive using feedback during large current transitions is provided. A desired transition profile, which uses feedback, is followed in...
7079350 Circuit and method for controlling the parking and unparking of a read-write head  
A control circuit controls a motor assembly having a coil and a movable arm. The control circuit includes a drive circuit that is coupled to the coil and that generates a drive signal in response...
7064919 Disk storage apparatus  
In a disk storage apparatus having an actuator for loading/unloading a magnetic head with respect to a magnetic disk, a voltage signal generated when the actuator is driven is detected by a voltage...
7054790 Method and apparatus for storage device performance measurement  
Method for measuring performance of a storage device including rotatable media, for storing data to and/or retrieving data from said media via one or more data buffers. The measurement method...
7054099 Methods and systems for moving a read/write head to a velocity and position where it is useful to switch from a deceleration phase to a settling phase of a seek operation  
Improved deceleration control for a disk drive is provided. A deceleration profile is selected based on a present velocity (v i ), a present position (x i ) and a BEMF constant associated with a...
7054098 Disk drive employing asymmetric acceleration/deceleration pulses for acoustic noise reduction during unlatch  
A disk drive is disclosed comprising a disk, an actuator arm, a head connected to a distal end of the actuator arm, and a voice coil motor (VCM) for rotating the actuator arm about a pivot to...
7035042 Fast positioning of disk drives and other physical systems  
A method useful to change a system's output from one value to another within a prescribed time-interval in an optimal manner using optimization criteria such as minimal time (e.g., to increase...
7031100 Motor torque constant variation compensation  
Method and apparatus for compensating for a decrease in the torque constant of an actuator motor in a data storage device. An actuator supports the head adjacent a data recording surface on which a...
6995945 Head positioning system, disk drive apparatus using the same, and head positioning method  
A head positioning system includes: a positioning mechanism section 1 for positioning a head 12 ; a position controller 2 for detecting a head position signal x to output a position control...
6995944 Head positioning control method for a storage device and head positioning control device  
A head positioning method and device positions a head which reads disk-type storage medium at a specified location, and accurately estimates estimates a bias value during settling control. A disk...
6987636 Adjusting track density over disk radius by changing slope of spiral tracks used to servo write a disk drive  
A method and apparatus is disclosed for adjusting the track density over the disk radius by changing the slope of spiral tracks used to servo write a disk drive. A plurality of spiral tracks are...
6977794 Asymmetric seek velocity profile to improve power failure reliability for rigid disk drive with ramp  
A disk drive having a control system which adjusts seek velocity profiles is disclosed. The seek velocity profile is adjusted based on the direction of the seek and the location of the target...
6967811 Disk drive having first and second seek operating modes for controlling voice coil motor temperature rise  
A disk drive comprising a first seek operating mode to move the actuator over a seek distance D in a seek time T 1 , using a first seek profile for minimizing T 1 , wherein for a first repetitive...
6961205 Magnetic disk apparatus  
A seek controller corresponds to a velocity control system which produces a target value based upon a target track, a present position, and a remaining distance from a commencement of a seek...
6961204 Head position control method and disk storage device  
A head position control method controls the speed of the head using the position and the speed detected from the servo information on the disk and directly detects the head speed. The speed...
6950272 Method and apparatus for the acoustic improvement of the pulsed current method for controlling the velocity of a transducer head  
A method and apparatus for reducing the acoustic output of a computer disk drive during a load or unload operation are provided. According to the invention, a pulse train having pulse widths that...
6940685 Voltage-mode drive for driving complex impedance loads  
A method of driving an electrical load having a complex electrical impedance, such as a voice-coil motor controlling the position of a read/write head in a data storage disk drive system, comprises...
6940684 Disk device and seek control method  
When a head passes over a track with a projected item in a seek operation, the CPU delays a seek start time to conduct the seek by changing a period of time from a seek start position to a position...
6937431 Matching peak velocities of acceleration and deceleration seek profiles in a disc drive  
A seek operation is performed by identifying a seek length of the seek operation and selecting a representation of a deceleration position-velocity profile based on the seek length. Successive...
6937430 Robust triple-mode compensator for hard disk drives with dynamic friction  
Friction existing between any two surfaces having relative motion is nonlinear, multiform, and is difficult to model. Nonlinear friction in the actuator pivot of a hard disk drive (HDD) limits the...
6937429 Magnetic disk storage apparatus and method for controlling magnetic disk storage apparatus  
In a magnetic disk storage apparatus, when power supply is stopped, a magnetic head can be retracted safely and quickly so as not to be damaged. There are provided a back electromotive a force...
6937428 Reducing actuator arm oscillation during settle mode in a disc drive servo system  
An apparatus and method for compensating actuator arm oscillation induced by resonance mode excitation during a seek in a disc drive data handling system. The actuator arm supports a head adjacent...
6930853 Adaptive seek control for maximum performance with minimal filter corruption  
By dynamically adjusting the maximum voice coil motor driving current produced by an amplifier in a disc drive, amplifier saturation may be reduced, while still maintaining optimal current to...
6917489 Apparatus and method for performing seek-servo routine of hard disk drive  
A seek-servo apparatus and method used by a hard disk drive is capable of making the actual position of a head correctly follow the target position of the head irrespective of time delay. The...
Matches 1 - 50 out of 304 1 2 3 4 5 6 7 >