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7388726 |
Dynamically adjustable head disk spacing slider using thermal expansion
A disk drive includes a slider assembly and a controller that directs current to the slider assembly to dynamically adjust the head-to-disk spacing. In one embodiment, the slider assembly includes...
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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...
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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...
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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...
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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...
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7136258 |
Rotational recording apparatus and control method
A technique for adaptively and stably updating the feed forward value required to drive the head of a rotational recording apparatus. A trajectory of a target position is generated for each seek...
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7136256 |
Head positioning control method for a storage device and head positioning control device
A head positioning method and device positions a head which reads a disk-type storage medium at a specified location, and accurately estimates a bias value during settling control. A disk device...
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7116515 |
Method and apparatus for compensating for torque change in seek servo
A method and apparatus to compensate for a difference between an actual torque constant and a modeling torque constant used for servo design in a disc drive. The method has operations of:...
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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...
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7061714 |
Disk drive modifying estimated seek times for a rotational position optimization algorithm based on change in estimated seek time parameter
A disk drive is disclosed comprising a disk, a head, and a voice coil motor (VCM) for actuating the head over the disk. The disk drive executes a rotational position optimization (RPO) algorithm to...
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7031095 |
Servo controller method and apparatus for high tracks per inch hard disk drives using a delay accomodating state estimator
The invention applies to servo controllers for at least the voice coil motor of a hard disk drive. Today, many control algorithms require 80 to 90 percent of the sampling period to complete their...
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6995946 |
Temperature compensation of seek profiles in data storage devices
Methods relating to compensating a pre-defined seek profile for use in a data storage device, such as a disc drive, to manage the internal temperature of the device are disclosed. One embodiment...
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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...
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6927935 |
Method and apparatus for head positioning using servo control in a disk drive
There is disclosed a disk drive using a disk medium in which a non-servo range exists. In order to position a head at a target track, a CPU executes a seek operation by normal velocity control...
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6909576 |
Method, system, and program for generating control signals to perform a seek operation
Provided are a method, system, and program for initializing a storage device. A pulse response profile is determined for a storage system in response to a series of signals generated to seek to a...
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6907499 |
Interrupting disc write operations to service read commands
Systems and methods in a disc drive improve data transfer performance by interrupting disc write operations to service read commands.
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6903897 |
Performance of a rotary actuator in a disk drive
A method for improving the performance of a rotary actuator in a disk drive, the rotary actuator comprises a voice coil motor (VCM) characterized by a torque parameter, the disk drive comprises a...
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6898039 |
Positioning control device for two-stage actuator
In a positioning control device for a two-stage actuator having a coarse-movement actuator and a fine-movement actuator, a notch filter having a cutoff frequency fn is provided to a coarse-movement...
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6879460 |
Magnetic recording disk drive
A magnetic recording disk drive can prevent the deterioration of the head off-track characteristics and the reduction of the drive performance even when an erase band asymmetry resulting from a...
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6873490 |
Control object positioning using jerk, current and time optimized control profiles
Method and apparatus for moving a control object, such as a data transducing head in a data storage device, from an initial position to a destination position. A base generation term describes a...
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6850386 |
Control object positioning using an optimum jerk profile to reduce excitation of mechanical resonances
A method for positioning a control object using an optimum jerk profile to reduce excitation of mechanical resonances. A base set of control profiles is selected to describe jerk, acceleration,...
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6850385 |
Repeated servo runout error compensation in a disc drive
An apparatus and associated method are disclosed for compensating for repeated servo runout error in a disc drive. The disc drive includes a disc on which servo information is arranged as a...
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6831809 |
Rotary recording apparatus and method of controlling the apparatus
A control arrangement having a feedforward system and a feedback system, a control model for generating reference position data from a feedforward control signal is separated into an original...
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6809896 |
Power-efficient seek operations in hard disk drive
An adaptive maximum seek velocity clipping technique is employed in a disk drive to reduce head movement power requirements. Separate maximum seek velocities are established for respective...
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6809491 |
Positioning control method
A position of an object is controlled based on a distance YS until the object is stopped, a target velocity VS of the object, acceleration time ta for accelerating the object, deceleration time td...
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6791785 |
Disk drive with efficient coil temperature estimation
A controller for a disk drive that accesses a look up table having a plurality of thermally characterized values corresponding to a plurality of seek operations. For each seek operation, the...
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6768610 |
Microactuator servo system in a disc drive
A method and apparatus position a plurality of data heads relative to a plurality of surfaces of at least one disc in a disc drive. One of the plurality of data heads corresponds to each of the...
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6762571 |
Sinusoidal feed-forward seek with adaptive acoustic level constraint
A method and apparatus for controlling acoustic noise generated by a seek operation in a disc drive by using a feedback control system to control the seek operation. The feedback control system is...
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6754036 |
Automated tuning of disc drive seek profile
Methods and systems in a data storage device selectively employ a seek time array and/or a seek time list to accurately predict a time required for a seek operation to move a transducer in the data...
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6744590 |
Seek trajectory adaptation in sinusoidal seek servo hard disk drives
A method, apparatus, and computer program product for a hard disk drive servomechanism. In one embodiment, the apparatus comprises a disk which has a surface, a spindle motor that rotates the disk,...
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6738220 |
Servo settling by utilization of a bias torque offset value which depends on the memory of previous seek operations
A disk drive control system that compensates for mechanical bias torques present in disk drives. A transducer, commonly referred to as a head, is attached to an actuator arm that is subjected to...
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6728061 |
Head position control method, control device for disk device and disk device
The present invention relates to a head positioning method and device for positioning a head to read information from disk media at prescribed positions using a rotary actuator, in which...
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6724564 |
Seek distance dependent variable max VCM seek current to control thermal rise in VCM's
A disk drive and methods for preventing a coil in a voice coil motor from overheating due to the application of excess current. The disk drive comprises a servo control system. The servo control...
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6704159 |
Automatic acoustic management system for a disc drive
A method of implementing an automatic acoustic management feature for a disc drive includes receiving an acoustic/performance compromising factor from a host, tuning disc drive performance by...
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6690529 |
Disk storage device and parameter transfer method
A hard disk controller (HDC) receives a request an operation to retrieve, read, or write data using a magnetic disk. An MPU determines the contents of the received request, and transfers to an IC...
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6687081 |
Disk drive using seek profile to enhance fly height control
A disk drive uses seek profile manipulation to provide enhanced transducer fly height control. The maximum seek velocity that is used during a seek operation is made dependent upon, among other...
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6674606 |
Method and apparatus to normalize the acceleration constant
A method and apparatus for normalizing the acceleration constant used by a servo control system in a disc drive are disclosed. The method and apparatus involve performing a test seek and summing...
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6636377 |
Method of tuning feed-forward control in a disk drive
A method of tuning a servo control system in a disk drive that implements seeks using a the feed-forward command effort signal u ffwd and a PES reference signal r that were designed to be...
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6628579 |
Storage apparatus
A learning control unit is provided between a feedback calculating unit and a driving unit. When a period for one medium rotation period is assumed to be T L , an unknown drive current function...
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6624964 |
Method and apparatus for reducing seek acoustics in disk drives for AV systems
Method for performing seek operations in a disk drive including at least one data disk having multiple concentric data tracks thereon, and a transducer radially moveable relative to said data...
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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...
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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;...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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