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| Number | Title | Issue Date |
| 8107187 | Transitioning between modes of control for motor of recording device The present disclosure includes systems and techniques relating to control of recording devices, such as disk drives. Systems and techniques can include controlling a motor to actuate a head about a surface of a rotating recording medium, switching from a first mode... | 01/31/2012 |
| 8072704 | Energy-saving operation of a storage device A computer implemented method is disclosed, for energy-saving operation of a storage device with a read/write head. The method includes monitoring workload of the storage device, calculating current mean workload and adjusting seek speed of the read/write head of th... | 12/06/2011 |
| 7995305 | Calibrating voice coil motors Methods, systems, and apparatus, including computer program products, are described for calibrating voice coil motors. In one aspect, a method is provided that includes seeking toward an outer diameter of a machine readable medium from a target servo track to a blan... | 08/09/2011 |
| 7839600 | Disk drive employing data-based basis function expansion for tuning seek servo loop A method of tuning a seek operation of a disk drive is disclosed, the disk drive comprising a disk, an actuator arm, a head coupled to a distal end of the actuator arm, a voice coil motor (VCM) for rotating the actuator arm about a pivot, and a closed loop servo sys... | 11/23/2010 |
| 7787211 | Back electromotive force (BEMF) calibration method, method of controlling unloading of disk drive apparatus using BEMF calibration method, and disk drive apparatus using the same A method of calibrating a parameter to measure the back electromotive force (BEMF) of a voice coil motor (VCM), and a method and apparatus to use the calibrating method to perform unloading control. The calibration method includes: reading servo data and measuring a... | 08/31/2010 |
| 7589931 | Method, apparatus, and storage medium for controlling track seek servo in disk drive, and disk drive using same Provided are a method, apparatus, and storage medium for controlling a track seek servo in a disk drive. Thus, a transducer is moved to a target track using a transformed Proximate-Time Optimal Servo (PTOS) velocity trajectory in which an acceleration duration is sy... | 09/15/2009 |
| 7580219 | Controlling seeks using non-linear switching curves Controlling seeking of a transducer includes accelerating the transducer to a seek velocity, generating a linearized switching curve defining a position and velocity of the transducer at which deceleration should begin, and controlling the velocity of the transducer... | 08/25/2009 |
| 7570452 | Two degree of freedom position control method, two degree of freedom position control device, and medium storage device In a position control device based on a current observer control for performing two degree of freedom control, calculation accuracy is improved using a fixed point processor. For a target position trajectory and position error, which are inputs of a two degree of fr... | 08/04/2009 |
| 7551391 | System and method for controlling head velocity by demodulating servo information A control device demodulates servo information read from a storage medium of a storage device via a head. A velocity demodulating unit demodulates a moving velocity of the head based on the servo information. A velocity correcting unit corrects the moving velocity, ... | 06/23/2009 |
| 7477476 | Trajectory control profile with non-zero initial velocity Various embodiments are generally directed to moving a control object using a sine-based trajectory profile with an initial non-zero velocity. ... | 01/13/2009 |
| 7471486 | Disk drive estimating seek time according to a seek profile and a variance group A disk drive is disclosed which receives a plurality of access commands from a host, where each access command identifies a target track. The access commands are stored in a command queue, and for each command in the command queue, a seek length is computed correspo... | 12/30/2008 |
| 7457076 | Head seek control method suppressing vibrations and rotatary recorder/reproducer In seek control for a head of a rotary recorder/reproducer, the seek time is reduced with noise reduced while utilizing a driving force of an actuator effectively. In one embodiment, when a microprocessor generates a control signal for a drive current given to an ac... | 11/25/2008 |
| 7430093 | Seek control method of hard disk drive, recording medium storing method and hard disk drive adopting method The present invention relates to a hard disk drive performing a seek control method using a multi-sinusoidal wave acceleration profile, where the seek control method is capable of coping with a variation in a voice coil motor driving current due to variances in a pe... | 09/30/2008 |
| 7430089 | Data storage device and write processing method for data storage device A data storage device executes sector guarantee processing at an unexpected power supply disconnection. The sector guarantee processing can be accurately performed even if the fluctuation of power supply voltage during normal operation is high. The voltage of the po... | 09/30/2008 |
| 7420765 | Seek control apparatus, seek control method and storage apparatus A seek control apparatus for performing a seek control of a head comprises an MCU that acquires control information corresponding to the externally indicated data length out of the control information stored in a storage section storing the control information for s... | 09/02/2008 |
| 7397630 | 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 position and a velocity of the head are made based on reproduced servo infor... | 07/08/2008 |
| 7394613 | Control device, disk device, and seek orbit generation method A waveform generator generates an acceleration orbit, a velocity orbit, and a position orbit from the seek time. Each orbits multiplied by respective gains, whereupon the orbits are synthesized by a first adder. The resulting composite orbit is multiplied by a seek ... | 07/01/2008 |
| 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 disk from an initial track on the rotatable disk toward a destination... | 06/03/2008 |
| 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 deteriorated due to temperature variation of the VCM. To eliminate this disadvan... | 05/20/2008 |
| 7372660 | Disc storage system with adaptive PID control A disc drive controller circuit for an actuator receives reference data indicating a desired actuator position “θd”, error data indicating a difference “e” between the desired actuator position and a sensed actuator position “θ”, and adaptiv... | 05/13/2008 |
| 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 operational temperature. A seek servo control method considering temp... | 05/06/2008 |
| 7369346 | Method for retracting head upon interruption of power, and disk drive employing the method A charge and discharge controller causes an capacitor to be charged by a power supply to a disk drive, and causes the capacitor to discharge when a power supply monitor detects the interruption of power to the disk drive. Upon detection of the interruption of power,... | 05/06/2008 |
| 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 correction method includes: performing a test seek routine for torque const... | 04/22/2008 |
| 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 to a cylinder number is equal to or smaller than 2; calculating a seek... | 04/15/2008 |
| 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 velocity signal is filtered to acquire a vibration signal. The vibrati... | 04/15/2008 |
| 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 noise of the disc drive while shortening track-seek time. In the metho... | 04/15/2008 |
| 7352523 | Ramp unload in disc drives Embodiments of the present invention provide for apparatus and methods for performing unload operations, including enabling read/write heads to reach a desired velocity at the ramp. Embodiments of the present invention are particularly beneficial for handheld produc... | 04/01/2008 |
| 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 lengths of seek requests, locations of seek requests, a backlog of seek r... | 04/01/2008 |
| 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 spirals that are prewritten using current of a predetermined frequency. The... | 03/25/2008 |
| 7349174 | Soft sensor for operating shock in a disc drive A method of preventing a write operation to a disc in a disc drive during a shock event without the use of a separate shock sensor comprises steps of monitoring an actuator voice coil motor (VCM) control plant output signal, generating an actuator voice coil motor (... | 03/25/2008 |
| 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 includes: detecting a supply voltage for the disk drive; and adjusti... | 02/19/2008 |
| 7330328 | Random number generation using back electromotive force (BEMF) values Method and apparatus for generating a random number, such as for use in a security protocol to control access to a data processing system. A processor generates the random number in relation to a back electromotive force (BEMF) value. The BEMF value is preferably ob... | 02/12/2008 |
| 7327103 | Driver and method for control of voice coil motor in disk drive A driver for a voice coil motor in a disk drive includes a sensor that provides a sense current by sensing a coil current in the voice coil motor, a comparator that provides an error current by determining a difference between a command current and the sense current... | 02/05/2008 |
| 7319652 | Controlling optical pickup of optical disk drive by detecting change of sampling signals taken from a motor drive signal A drive current or a drive voltage is controlled corresponding to change of load by sampling the drive current or drive voltage of a motor to move an optical pickup and then detecting change of the sampling signal as change of the optical pickup when it is moved. Mo... | 01/15/2008 |
| 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 suitable for the same, and an HDD adopting the same. The method includes: ca... | 01/01/2008 |
| 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 upper device to move a magnetic head from a start track to an end track ... | 11/13/2007 |
| 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 position and a velocity of the head are made based on reproduced servo infor... | 11/06/2007 |
| 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 perform a super silent seek in which an acoustic output due to the movem... | 10/30/2007 |
| 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 trajectory generated by a convolution operation, a rate of change of ac... | 10/30/2007 |
| 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 apparatus including a front camera having a photographing optical axis within... | 10/30/2007 |
