Matches 51 - 100 out of 187 < 1 2 3 4 >
Match Document Document Title
6600699 Apparatus for searching of recorded information  
To provide a disk unit wherein a prompt search is enabled even if the recorded time of one track is long, if the total recorded time of one track is below five minutes, a search mode is set to a...
6590735 Continuously adaptive seek deceleration profiling  
A method for adapting a control system governing the swing of an actuator arm to the actual deceleration capacity of an attached servomechanism, comprising: maximally accelerating the actuator arm;...
6580581 Recovery of lateral position of a servo system with respect to longitudinal servo bands of a magnetic tape  
A servo system and method position a head laterally with respect to magnetic tape longitudinal defined servo bands arranged in a longitudinally shifted pattern for identification, and separated by...
6578106 Data storage system adapted to select an operational state with corresponding performance levels and acoustic noise levels based on a system profile  
The present invention may be regarded as a data storage system and a method of controlling the acoustic noise generated by a storage drive of a data storage system. The data storage system includes...
6560658 Data storage device with quick and quiet modes  
Techniques are provided herein for reducing vibrations in various modes of a dynamic system. One such technique comprises incorporating vibration limiting and sensitivity constraints into a partial...
6549364 Optimization method and apparatus for a generalized fourier seek trajectory for a hard disk drive servomechanism  
A method and apparatus for moving a transducer across a disk surface in accordance with generalized Fourier seek trajectories for position, velocity, and acceleration control. The generalized...
6545838 Self tuning model reference controller in a disc drive  
Method and apparatus for moving a head of a disc drive from an initial position to a destination position on a recording surface of a rotatable disc by generating and applying a model reference...
6507451 Seek control method and system using stored velocity-vs-position data  
During a sampling interval, a disk-drive seek controller receives a digital sample of actuator drive current and a head-assembly position signal from a drive system and estimates a one-sample...
6504670 Method and apparatus for reducing oscillations excited during a seek operation in a disk drive  
Disk drive access times are reduced by including at least one cancellation impulse in a voice coil motor input signal to effectively cancel oscillations caused by natural resonances in an actuator...
6490120 Servo gain optimization using a variable convergence factor  
Apparatus and method for optimizing a gain of a disc drive servo circuit, the gain used to control the magnitude of current applied by the servo circuit to a voice coil motor to position a head...
6490121 Accelerated servo control calculations method and apparatus for a disc drive  
Apparatus and method which provide accelerated servo control value calculations for a control processor controlling an actuator maintaining a head adjacent a rotatable disc f a disc drive. A...
6465981 Adaptive anti-windup method and apparatus for disc drive servo control  
A method and apparatus are provided for positioning a head over a disc in a disc drive while maintaining servo loop stability. The apparatus includes an actuator-head assembly having a large-scale...
6456452 Feed forward compensation for repeatable head position error in a disc drive  
Method and apparatus for reducing repeatable runout signals in a servo position error (SPE) signal of a disc drive actuator. During track following, a measurement estimate is obtained through the...
6449117 Reducing acoustic noise using a current profile during initial stages of a disc drive seek  
Apparatus and method for reducing the generation of acoustic noise in a disc drive. A seek is carried out to move a head from an initial track to a destination track on a corresponding disc surface...
6441988 Method and apparatus for reducing acoustic noise in a hard disk drive  
A hard disk drive which moves a transducer across a disk surface so that the transducer has an essentially sinusoidal acceleration trajectory. The transducer may be integrated into a slider that is...
6429997 Speed profile selecting means for a recording and reproducing apparatus  
A disk device has a head for recording and reproducing data to and from a disk-shaped recording medium. A carriage for supporting the head is provided. A driver is included for moving the carriage...
6396653 Apparatus and method for reduction of idle-mode acoustics in a disc drive  
An apparatus and method for minimizing audible noise in disc drives during idle periods uses a low-noise velocity profile and/or low noise position profile to govern the movement of a seeking...
6369973 Disk device with temperature calculation section for calculating temperature change and difference  
The disk device of this invention includes: a disk driving section for rotating a disk; a head for recording and/or reproducing information on and/or from the disk; a head moving section for moving...
6369972 Temperature monitoring method of a disk drive voice coil motor from a traveled distance  
A method for controlling the current applied to a voice coil motor (VCM) prevents overheating of a coil in the VCM. The method includes the steps of defining an acceleration interval for measuring...
6314473 System for removing selected unwanted frequenices in accordance with altered settings in a user interface of a data storage device  
Techniques are provided herein for reducing vibrations in various modes of a dynamic system. One such technique comprises incorporating vibration limiting and sensitivity constraints into a partial...
6310743 Seek acoustics reduction with minimized performance degradation  
A method of controlling an actuator in a disc drive to perform a seek operation prior to a read operation is disclosed. A radial distance between the initial track and the target track is...
6243226 Apparatus and method for digital servocontrol in a data storage system using disk recording media  
The present invention relates to a servo control apparatus of a disk recording system and particularly to a servo control apparatus and method which are capable of controlling position of a head...
6222696 Head unlatch controlling method and arrangement in magnetic disk drive  
In a head unlatch controlling method and arrangement in a hard disk drive head unlatch controlling method, a head unlatch operation is performed in an open loop mode, using a predetermined current...
6195222 Disk drive with seek profile selection based on a queued vs. non-queued environment  
A disk drive and method of optimizing data access time by selecting a seek profile and/or settle criteria based on a queued or non-queued environment. The disk drive includes an actuator and a...
6178060 Current profile shaping to reduce disc drive seek time variation and acoustic noise generation  
Apparatus and method for reducing the generation of acoustic noise in a disc drive. A seek is carried out to move a head from an initial track to a destination track on a corresponding disc surface...
6148240 Method and apparatus for performing an open-loop current shaping for seeking acoustics reduction in a disk drive  
Methods and apparatus for reducing overall seeking acoustics in a head-disk apparatus are disclosed. In accordance with one aspect of the present invention, a method for reducing overall seeking...
6118616 Digital servo control method for controlling a head driver for moving a head to a target track  
The present invention relates to a servo control apparatus of a disk recording system and particularly to a servo control apparatus and method which are capable of controlling position of a head...
6111720 Method and apparatus for providing separate read/write velocity curves  
A computer disk drive unit having a control system that uses a separate velocity profile for read seeks and for write seeks is disclosed. Appropriate velocity profiles are provided according to...
6101065 Disk drive with seek profile selection based on read/write operation  
A method for reducing data access time in a disk drive. The disk drive includes an actuator and a servo controller. The servo controller commands the actuator to perform a seek from a current...
6084742 Drive control apparatus for a disk drive  
A processing unit for effecting speed control in a drive control apparatus includes a storing unit having a first table which stores discrete values having exponential intervals, and a second table...
6078453 Method and apparatus for optimizing the servo read channel of a hard disk drive  
A method of deriving optimum read channel parameters for use in reading servo sector data from a disk drive having a head mounted on an actuator, a read channel including a preamplifier, a disk...
6072649 Constant density recording method and system for headless format in hard disc driver  
A method of and a system for efficiently using split information stored in an unnecessary data sector, thereby reducing unnecessary data. The system includes first registers respectively adapted to...
6054833 Disk drive having improved head-velocity control, and method therefor  
A disk drive has a servo controller that regulates the velocity of a data-transducing head as the head is moved between a parked position and a data-transducing position within the drive. The head...
6011668 Method and apparatus for gain calibration in a disk drive servo control system and disk drive recording apparatus with gain calibration function  
A method of gain calibration capable of providing the better performance and stability in a servo control system of a disk drive recording apparatus (hard disk drive) by the measurement and...
5978752 Model validation algorithm for characterizing parameters and uncertainty in a disc drive  
A system and method validate a model used in implementing a model-based servo controller in a disc drive. A nominal model is first constructed. The nominal model is augmented with an uncertainty...
5973871 Disk drive adaptable for multiple operating voltages  
A disk drive system that functions at various different power supply voltage levels includes a reset generator for resetting the disk drive in response to a predetermined reset condition dependent...
5936789 Off-track tester for testing MR head and method of testing the same  
An off-track characteristics tester for testing an off-track characteristics of an MR head, according to the present invention, comprises spiral scan type read-out unit for reading out a test data...
5936792 Positioning adaptive control method and positioning device as well as information storage device  
A positioning adaptive control method and positioning device which allow rapid positioning of a head by speed-controlling a seek operation in an information storage device such as a magnetic disk...
5907450 Pre-read learning digital servo-control device  
A pre-read learning digital servo-control device has a digital servo-control device for controlling the speed and/or position of a controlled object. A corrective control input for a (n+1)-th trial...
5901009 Reduced seek acoustic noise direct access storage device  
A disk drive with reduced seek acoustic noise and a method for implementation, without any additional hardware or mechanical modifications to the actuator includes a filter such that servo-loop...
5895500 Data processing system with reduced look-up table for a function with non-uniform resolution  
A data processing system with a look-up table means for implementing a transfer function with non-uniform resolution comprises a memory to store a plurality of function data; an input to receive...
5880902 Method and apparatus for adaptively calibrating disk drive performance based on real time performance monitoring  
An adaptive technique for calibrating a disk drive based on real time measurements. The invention includes a sensor for measuring a performance characteristics of a disk drive, a control circuit...
5835302 Compensating for variations in torque capability of voice coil motors  
A method for compensating for position and component induced variations in the acceleration and deceleration capabilities of a voice coil actuator in a disc drive, comprising the steps of dividing...
5825581 Magnetic disk drive where seek speed depends on atmospheric pressure and seek direction  
A magnetic disk drive, which controls the seek and positioning of a magnetic head for recording and reproducing data to a specific position on the magnetic disk in accordance with the servo data...
5760992 Method for carrying out seeks in a hard disc drive to limit the generation of acoustic noise  
A method for carrying out seeks of a transducer between tracks of a disc drive to limit acoustic noise arising from changes in the acceleration of the actuator which supports the transducer. The...
5726825 Method for carring out seeks in a hard disc drive to limit the generation of acoustic noise  
A method for carrying out seeks of a transducer between tracks of a disc drive to limit acoustic noise arising from changes in the acceleration of the actuator which supports the tansducer. The...
5696646 Disk apparatus for monitoring error by setting timeout time upon seek  
Seek operation of a seek control section is monitored by an error monitoring section, and when a seek operation does not end normally, the control is forcedly switched over to fine control by the...
5677808 System and method for controlling a seek operation in a disk drive  
A disk drive, comprising a storage medium having data tracks for storing data, a spindle motor mounting the storage medium for rotation, an interactive element for reading information from and...
5675558 Seeking control apparatus and method for disk drives, using slew-rate limit for control output  
The purpose of the present invention is to provide a method and an apparatus for seeking-control for disk drives, in which (i) the step current waveform at the start of speedup or at the switching...
5668680 Time optimal control of a disc drive actuator with vibro-acoustic constraints  
A method for optimizing the demand velocities in a disc drive velocity profile using both time and vibro-acoustic constraints. An accurate, high-order dynamic model of the disc drive is formulated...
Matches 51 - 100 out of 187 < 1 2 3 4 >