Abstract: A method and apparatus to safely repress disturbances from being applied to a system from the surroundings in which the system is used. The method of adaptively repressing disturbances includes estimating frequency components of a disturbance applied to a system in a user environment; and optimizing parameter values determining characteristics of a disturbance compensating servo control loop including a disturbance observer, based on the estimated frequency components of the disturbance.

Abstract: An adaptive spindle motor startup method includes applying an internal driving voltage to a disk drive, sensing an internal temperature of the disk drive, and controlling the startup of a spindle motor by adjusting a startup factor related to a startup current applied to the spindle motor corresponding to the sensed temperature. Thus, the delay of time to reach a target rotation rate is prevented in the spindle motor in an extreme environment, for example at temperatures lower or higher than 25° C. The overall startup time is efficiently optimized through the improvement of the startup method of the spindle motor.

Abstract: A method used in a disk drive system for compensating a frequency component affecting servo control performance. The method includes detecting a frequency component affecting a servo control output in a disk drive/head during a manufacturing process and storing the detected frequency component in a nonvolatile memory device. A frequency component is read from a nonvolatile memory device corresponding to a selected head each time the disk drive is turned on by a user. A parameter value of a filter is determined by using a servo control circuit of the disk drive to suppress the read frequency component.

Abstract: 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 compensates for a gain distortion and a phase delay caused by a notch filter and a VCM driver using a sinewave acceleration trajectory. According to the method of controlling a track seek of a hard disk drive, an ideal sinewave for obtaining a position y*(n), a velocity v*(n), and an acceleration a*(n), according to a sinewave acceleration trajectory, and a sinewave indicating a gain distortion and a phase delay may be integrated and a VCM driving current u(n) can be generated by the integrated sinewave for compensating for gain distortion and phase delay, compensating for a value C(j2?f) of the gain distortion and the phase delay caused by the notch filter and the VCM driver.

Abstract: Provided are an apparatus and method for controlling a motor which compensates for a mechanical tolerance of the motor in a case where a feedback sampling frequency increases in order to more precisely control a brushless DC motor. The apparatus for compensating the mechanical tolerance of the brushless DC motor includes: a speed controller calculating a speed error that is a difference between a motor speed measured in control sections and a reference speed using a back electromotive force generated by the motor, and generating a motor control input signal using the speed error of the control section; a moving average calculator calculating a moving average value of the motor control input signals in a predetermined moving average section including recently generated motor control input signal whenever the motor control input signals are generated; and a motor driver generating an electric current for driving the motor corresponding to the moving average value.

Abstract: A noise-resistive, burst-mode receiving apparatus including a voltage control signal generator for multiplying a frequency of a system clock signal and generating a voltage control signal having a level that corresponds to the multiplied frequency; a reset signal generator for delaying an irregular input signal in the unit of a packet, in response to the voltage control signal, performing an exclusive OR operation on the delayed and input signals, and outputting the result as a reset signal; a clock signal generator for generating a signal having a level that is changed at the middle point of each bit included in the packet as a recovered clock signal in response to the reset signal and the voltage control signal and outputting the recovered clock signal; and an output buffer for buffering the input signal and outputting the buffered signal as recovered data in response to the recovered clock signal.

Abstract: The resonance of a hard disk drive using a notch filter is suppressed by detecting a resonance frequency after a far distance search is conducted, in a state in which the notch filter is disabled, and storing the detected resonance frequency as a start frequency, determining a coefficient of the notch filter to correspond to the start frequency and enabling the notch filter, detecting a resonance frequency after a far distance search is conducted, in a state in which the notch filter is enabled, and storing the detected resonance frequency as a target frequency, and changing the coefficient of the notch filter to correspond to the target frequency.

Abstract: 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 temperature change in controlling a disk drive may includes determining a seek time considering a given seek length and operational temperature change in a seek mode, and generating position, velocity, and acceleration trajectories to move a transducer according to the determined seek time.

Abstract: 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 adjusting a seek time according to a track seek length based on the detected supply voltage.

Abstract: 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 compensates for a gain distortion and a phase delay caused by a notch filter and a VCM driver using a sinewave acceleration trajectory. According to the method of controlling a track seek of a hard disk drive, an ideal sinewave for obtaining a position y*(n), a velocity v*(n), and an acceleration a*(n), according to a sinewave acceleration trajectory, and a sinewave indicating a gain distortion and a phase delay may be integrated and a VCM driving current u(n) can be generated by the integrated sinewave for compensating for gain distortion and phase delay, compensating for a value C(j2?f) of the gain distortion and the phase delay caused by the notch filter and the VCM driver.

Abstract: A hardware device for executing conditional instructions out-of-order and the execution method. An architecture is provided, enabling the hardware device such as a processor supporting the conditional instruction and a computer system to execute the instruction out-of-order. To this end, a conditional execution buffer is provided, and a register of a destination operand of the conditional instruction is renamed to another register. Hence, the hardware device using the conditional instruction can carry out the out-of-order execution, and the execution speed of the hardware device can be greatly improved.

Abstract: 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 variations in a seek servo operation, compensating for differences between modeling torque constants, used for servo designing, and actual torque constants. The method includes controlling gain of a seek control loop to vary depending on a torque constant temperature compensation value corresponding to a measured temperature of the hard disk drive, the seek control loop generating a seek driving current to be applied to a voice coil in the seek mode.

Abstract: A packet forwarding system to transfer packets through a plurality of interfaces by reading out information for the packet forwarding beforehand includes a packet processor that organizes and processes data to be transferred into packets, a packet memory storing the organized packets, a plurality of interfaces respectively transferring the packets stored in the packet memory depending on destinations of the packets, and a packet forwarding manager managing an packet information to transfer the packets through the plurality of the interfaces, respectively, and to control transfer of the packets immediately through a corresponding interface of the plurality of the interfaces by reading out the packet information before the packet forwarding. Accordingly, the fast packet forwarding is realized by processing the packet information read and the actual packet forwarding in parallel.

Abstract: A noise-resistive, burst-mode receiving apparatus including a voltage control signal generator for multiplying a frequency of a system clock signal and generating a voltage control signal having a level that corresponds to the multiplied frequency; a reset signal generator for delaying an irregular input signal in the unit of a packet, in response to the voltage control signal, performing an exclusive OR operation on the delayed and input signals, and outputting the result as a reset signal; a clock signal generator for generating a signal having a level that is changed at the middle point of each bit included in the packet as a recovered clock signal in response to the reset signal and the voltage control signal and outputting the recovered clock signal; and an output buffer for buffering the input signal and outputting the buffered signal as recovered data in response to the recovered clock signal.