Abstract: Various illustrative aspects are directed to a data storage device comprising one or more disks; an actuator arm assembly comprising one or more actuator arms, and configured to position the one or more actuator arms over disk surfaces of the one or more disks; one or more fine actuators, disposed on the one or more actuator arms; and one or more processing devices. The one or more processing devices are configured to: output a driver current to the one or more fine actuators, wherein the one or more processing devices are configured to rate limit a rise of the driver current over time during an activation of the driver current to within a selected rate limit of current rise over time.

Abstract: A first sequence of operations corresponding to an error recovery process of a memory sub-system is determined. A value corresponding to an operating characteristic of the memory sub-system is determined. The value is compared to a threshold level corresponding to the first sequence of operations to determine whether a condition is satisfied. In response to satisfying the first condition, a second sequence of operations corresponding to the error recovery process is executed.

Abstract: This disclosure provides for host-controller cooperation in managing NAND flash memory. The controller maintains information for each erase unit which tracks memory usage. This information assists the host in making decisions about specific operations, for example, initiating garbage collection, space reclamation, wear leveling or other operations. For example, metadata can be provided to the host identifying whether each page of an erase unit has been released, and the host can specifically then command each of consolidation and erase using direct addressing. By redefining host-controller responsibilities in this manner, much of the overhead association with FTL functions can be substantially removed from the memory controller, with the host directly specifying physical addresses. This reduces performance unpredictability and overhead, thereby facilitating integration of solid state drives (SSDs) with other forms of storage.

Abstract: The present disclosure relates to a critical point locking method of servos, including: computing a current target deviation according to a target position and an actual position, computing a variation value according to the current target deviation and a previous target deviation, determining whether the variation value being greater than a constraint value, modifying the current target deviation according to the current target deviation and a predetermined value upon determining the predetermined condition being satisfied, configuring the modified current target deviation as a current controlling deviation, and driving the servo to move toward the target position according the current controlling deviation. As such, the servo may lock the position for 360 degrees, the locking stroke of the servo may be improved, and the application of the servo may be enlarged.

Abstract: A data storage device is disclosed comprising a disk comprising a plurality of tracks, a head, and an actuator configured to actuate the head over the disk. An adjusted seek time is determined to seek the head from a first track to a second track, and an adjusted coast velocity and an adjusted coast time of the seek is determined based on the adjusted seek time and a power consumption of the seek when a driving current applied to the actuator is substantially constant during at least one of an acceleration time and a deceleration time of the seek.

Abstract: A disk drive is disclosed comprising a head actuated over a disk, wherein a bootstrap spiral track is written on the disk. While servoing on the bootstrap spiral track at least one circular reference track is written on the disk. A velocity profile is adjusted in response to the circular reference track, and a plurality of spiral tracks are written to the disk in response to the velocity profile.

Abstract: An operation device includes a rotational operation element, an angular velocity detection portion detecting an angular velocity of a rotational operation on the rotational operation element, and a playback speed information computation portion calculating, when the angular velocity detected by the angular velocity detection portion is in a first velocity range including an angular velocity of 0, playback speed information according to the detected angular velocity through a first functional computation and when the angular velocity detected by the angular velocity detection portion is in a second velocity range, which is a range higher than the first velocity range, playback speed information according to the detected angular velocity through a second functional computation, and outputting the calculated playback speed information.

Abstract: A reproduction device of a recording medium and a method for operating the same are disclosed. The reproduction device of a recording medium comprises a recording medium loading unit loading the recording medium, and inputting and/or outputting data of the recording medium; a main board provided with a central processing unit implementing reproduction of the recording medium in accordance with an input signal or a previously set program; and a key operation unit directly connected with a loader of the recording medium loading unit. Accordingly, the sub application processing open and/or close of the recording medium loading unit is actuated after a power supply of the reproduction device is turned, whereby the time required to detach or insert the recording medium from or to the reproduction device can be reduced.

Abstract: The present invention discloses a 3-phase brushless DC motor controller, which comprises: a unit for generating a PWM signal; an ADC for converting a back electromotive force (BEMF) signal from an analog form into a digital form; a synchronization and extraction unit operating in synchronization in part with the PWM signal for extracting the digital BEMF signal to obtain a corresponding ZCP signal; and a unit for judging whether a commutation operation is to be performed according to a change of the corresponding ZCP signal. A wait instruction and a delay instruction help to accurately acquire the digital BEMF signal.

Abstract: A system includes a control module configured to generate a first signal to control a speed of an actuator arm of a rotating storage device. An estimating module includes a first filter configured to generate a first filtered output based on the first signal. A second filter is configured to generate a second filtered output based on the speed of the actuator arm. The estimating module is configured to estimate a force to move the actuator arm based on (i) the first filtered output and (ii) the second filtered output. The first filter and the second filter include infinite impulse response (IIR) filters of Pth order, where P is an integer greater than 1.

Abstract: In an optical pickup driving mechanism using a stepping motor, a feeding operation of an optical pickup can be stabilized even in a broad operating temperature environment. In executing an optical axis correction feeding operation in response to an amount of lens shift of an objective lens of an optical pickup, a stepping motor controlling portion drives a stepping motor in a microstep drive mode to move a base of the optical pickup in a radial direction of an optical disk.

Abstract: A track-jump control system and method are provided. The track-jump control system applied in an optical disc drive comprises a signal generator, a protection device, a velocity estimator, and a controller. The signal generator receives the signal from the PUH and generates a tracking signal and a position signal. The protection device receives the position signal and when the position signal represents the PUH pass a predetermined position of the optical disc, the protection device generates a protection signal. The velocity estimator estimates the velocity of the PUH according to the tracking signal, and then generates a velocity signal. The controller receives the velocity signal and the protection signal, protects the velocity signal according to the protection signal, and generates a control signal to control the track-jump according to the protected velocity signal.

Abstract: A system includes a control module and an estimating module. The control module controls a speed of an actuator arm when the actuator arm moves from a parked position to an edge of a rotating storage medium and generates an arm control signal. The estimating module estimates a force to move the actuator arm based on the arm control signal and the speed, and generates an estimated force signal that adjusts the arm control signal.

Abstract: A motor control method for rotating an optical disc to be accessed by an optical head includes steps of: providing an increasing power to rotate a motor at increasing speed when a seeking operation of the optical head is performed; and interrupting the increasing power when a jumping operation of the optical head is performed.

Abstract: In an optical pickup driving mechanism using a stepping motor, a feeding operation of an optical pickup can be stabilized even in a broad operating temperature environment. In executing an optical axis correction feeding operation in response to an amount of lens shift of an objective lens of an optical pickup, a stepping motor controlling portion drives a stepping motor in a microstep drive mode to move a base of the optical pickup in a radial direction of an optical disk.

Abstract: An optical disk apparatus is disclosed which can suppress excessive reduction of recording speed on the inner side of a disk and that can assure quick response of accessing operation.

Abstract: The present invention relates to optical disc drives including a carriage which is movable radially of an optical disc and an objective lens which is supported on the carriage movably in radial directions of the disc for formation and placement of a beam spot on the disc. The invention aims at reducing minute vibration of the objective lens during a seek control stably and reliably. According to the present invention, the minute vibration of an objective lens (104) is reduced by moving the objective lens (104) at a relative speed of zero with respect to a carriage (101) during the seek operation, based on a TZC signal which indicates that the beam spot has crossed over a track in an optical disc (2). In this control, a position of the objective lens (104) in the carriage (101) right before starting the seek operation is detected and stored in a memory (802). Then, a position of the objective lens (53) in the carriage (101) is detected during the seek operation.

Abstract: A servo system with a multi-track seek algorithm with an acceleration clamp is presented. The multi-track seek algorithm detects zero crossings in a tracking error signal, counts the number of zero crossings to form a count, and calculates a reference velocity from the count. The algorithm also determines a time period between successive zero crossings, calculates a velocity from the time period, calculates a difference signal between the reference velocity and the velocity, and adjusts the control signal so that the velocity follows the reference velocity. The reference velocity can follow a velocity profile with acceleration portions, coasting portions, and deceleration portions which move an optical pick-up unit from a starting position to a target position. The acceleration of an optical pick-up unit is clamped during the multi-track seek operation.

Abstract: Optical disc drives designed for reduced power consumption switch the supply voltage in three stages between first, second, and third power supplies. The reduction in power consumption that is possible in the focusing and tracking drive circuits with three stage switching control is limited. This drive apparatus enables further reductions in power consumption. A drive output tracking signal is generated according to the drive conditions of the focusing or tracking drive circuit. The drive output tracking signal is applied to the drive circuit power supply, and the power supply is controlled according to the drive output tracking signal. A power supply change detector detects sudden changes in the drive output tracking signal, and inputs the detection signal to the DSP controlling the entire system. The DSP determines whether to improve the power supply response by comparison with predetermined conditions, and returns the result to the power supply.

Abstract: A method for controlling a stepping motor in an optical storage system and for achieving a short seek with the stepping motor is disclosed. The optical storage system comprises a pick-up head and object lens, wherein the object lens is movably installed on the pick-up head. The method includes determining a number of steps that the stepping motor should rotate; moving the object lens toward a target track; and utilizing the stepping motor to move the pick-up head toward a target position according to the number of steps that the stepping motor should rotate.

Abstract: The present invention provides an optical disc apparatus capable of rotating an optical disc with high speed while enabling reduced current consumption. The optical disc apparatus comprises a spindle motor for rotating the optical disc and a thread motor for driving an optical pick-up. When a command is received while the spindle motor is driven, a controller delays operation of the thread motor for a predetermined duration to allow operation of the spindle motor rather than immediately activating the thread motor. After the predetermined duration has elapsed, the controller activates the thread motor and halts the operation of the spindle motor. The predetermined duration may be either a fixed value or a variable value established so as to become smaller as rotation speed of the optical disc increases.

Abstract: A method for determining the position of a pick-up head involves retrieving the respective parameter values relating to the linear velocity and angular velocity of the pick-up head at a certain place on the optical disk, and then calculating the ratio of the parameter value of the linear velocity to the parameter value of the angular velocity. Since the ratio is linearly correlated with the distance between the pick-up head and the center of the optical disk, the absolute position of the pick-up head can be determined, as far as its whereabouts is concerned.

Abstract: The present invention is provides a method and apparatus for slip protection of DVD-RAM drive's seek control, comprising a slip end velocity controller, a re-seek controller, and a slip detector. Among them, the slip end velocity controller is used for providing a first control signal to direct a driver to control the slip end velocity of the optical head while seeking. The re-seek controller is capable of providing a second control signal to the seek controller for directing the seek controller to control the driver driving the optical head for re-seeking. The slip detector is used for receiving the TE signal sent from the preamplifier to determine if the optical head is slipping and to switch the input signal of the driver.

Abstract: The present invention discloses a system for speed error compensation. A predetermined speed signal subtracts a feedback speed signal to generate a speed error signal, and a microprocessor receives the speed error signal and outputs a calculated result. A feedback controller receives the calculated result and generates a first tracking control effort signal. A feedforward controller receives the speed error signal and generates a second tracking control effort signal according to a DC steady state error in the speed error signal. An optical head module moves at an actual speed determined by the total of the first tracking control effort signal and the second tracking control effort signal. A gain controller generates the feedback speed signal according to an actual speed signal detecting from the actual speed.

Abstract: In track jumping operation, an acceleration/deceleration pulse generation portion measures the TE signal amplitude during track jumping, and modifies the acceleration/deceleration time of the acceleration/deceleration pulse according to the measured amplitude to drive a tracking actuator. Also, the acceleration/deceleration pulse generation portion measures the movement time from the start of acceleration until a certain location is reached, and modifies the peak value of the deceleration pulse according to the measured time to drive the tracking actuator.

Abstract: A method and related apparatus for data accessing of an optical disk drive. The optical disk drive has a motor for rotating an optical disk and a pickup head. The pickup head is capable of writing data onto the optical disk according to a write-in clock. The method includes: when the pick-up head is seeking to a target position and a rotation speed of the motor is still being adjusted and unstable, making the pickup head slide back and forth within a predefined range, and making the pickup head slide toward the target position when the rotation speed of the motor becomes stable.

Abstract: A method for controlling an optical pickup head of an optical processing apparatus is provided. A first lead-lag compensator is disabled and a second lead-lag compensator is enabled when the optical pickup head switches from a following mode to a seeking mode. Then, an initial operating factor of the second lead-lag compensator is determined according to a last input value and a last output value of the first lead-lag compensator. An initial kick force of the actuator in the seeking mode is calculated by realizing the last input value and the last output value of the first lead-lag compensator immediately before the first lead-lag compensator is disabled. Finally, the optical pickup head is actuated to perform a seeking operation with the initial kick force.

Abstract: Provided are a method and apparatus for canceling noise from a track cross signal, a method for controlling an optical disc drive, an optical disc drive, and an optical disc reproducing apparatus. The method for removing noise from a track cross signal includes (a) removing noise from the track cross signal by binarizing the track cross signal with reference to hysteresis set values that are determined according to a command speed for a tracking actuator; and (b) removing glitch noise from the binarized track cross signal based on a predetermined time value. Accordingly, it is possible to effective remove noise to obtain information regarding the precise speed and position of a desired track.

Abstract: An apparatus to remove periodic disturbances in a recording medium having large eccentricity and deflection mass includes an actuator to change a position of a pickup in response to a combination of first and second compensation signals, an error detector to detect an error between positions actuator and the recording medium, a first compensator to receive the detected error and to output the first compensation signal that the actuator uses to actuate the pickup along the recording medium in upper and lower directions, and right and left directions; and a second compensator to output the second compensation signal from which the disturbance has been removed, to combine the compensated error and previous first and second compensation signals, and to filter the combined result at a predetermined bandwidth.

Abstract: A method for long seeking control of an optical read/write head is disclosed. The optical read/write head includes a sled moved by a sled motor, and a lens mounted on the sled and moved by a lens actuator, and said method includes steps of determining a velocity profile according to a desired travel distance of the optical read/write head; detecting an instant velocity and an instantaneous position of the optical read/write head at a certain time spot; comparing the instant velocity with a target velocity corresponding to the instantaneous position according to the velocity profile; modifying velocities of the sled and the lens according to the comparing result; and dynamically adjusting a position of the lens in the sled. An apparatus for long seeking control of an optical read/write head is also disclosed.

Abstract: A method and apparatus for canceling noise from track cross signal includes binarizing the track cross signal with reference to at least two reference values, and removing noise from the binarized track cross signal based on a command speed according to which a tracking actuator moves a pickup. Accordingly, it is possible to remove noise from a track cross signal so as to obtain information regarding precise speed of track searching or position on the track, irrespective of the searching speed.

Abstract: A data player or a method in which a reading and/or writing head is positioned according to anyone of 3 methods or combinations thereof: Calculating a desirable speed curve to position the head from a first to a second position and adjust the speed of the head's movement to the desirable speed, calculating and outputting an amount of energy to a driving mechanism to move the head a determined number of steps, increasing the power applied to a driving mechanism until the head is moved for one step. The positioning may additionally be used to perform coarse positioning while the head is positioned on a track of a data medium using a fine positioning mechanism.

Abstract: A disk apparatus includes a DSP (digital signal processor), and the DSP controls respective circuit components under instructions of a MCU. During a track jump, a DSP core detects a zero-cross cycle of a TE (Tracking Error) signal just before. If a detected zero-cross cycle is delayed than a target value, the DPS core applies an acceleration pulse of a first predetermined level to a driver, and if the zero-cross cycle is faster than the target value, the DPS core applies a deceleration pulse of a second predetermined level to the driver, whereby an objective lens can be controlled to move at approximately constant speed between adjacent tracks. However, if the zero-cross cycle is considerably delayed than the target value, the DSP core forestalls a reverse rotation of a moving direction of the objective lens against the disk by greatly accelerating the objective lens. Therefore, the number of tracks to have been jumped is not to be counted erroneously.

Abstract: A disk drive apparatus is disclosed for stabilizing a track jumping operation of an objective lens. The disk drive apparatus includes a detection section for detecting the direction that object lens is being moved by a tracking operation, and a discrimination section for discriminating the direction of the track jumping operation. A track jump movement then performed based on the detection of movement and discrimination of the track jump operation. Therefore, the track jump is stabilized without being influenced by the movement of the objective lens by the tracking operation.

Abstract: An optical disk device starts movement of a thread in a track-on state, and releases the track-on state when the thread moves by a certain amount, and gives a driving kick signal to an actuator. The movement of the thread and actuator can be placed in sufficiently good balance so that failure of track jump is prevented, thereby improving the reliability of the device body and suppressing the cost-up of the device body.

Abstract: A CPU compares a detected moving speed with a previously set reference moving speed and when the detected moving speed is smaller than the reference moving speed, controls to increase a motor driving voltage VM to be supplied to a motor and when the detected moving speed is larger than the reference moving speed, controls to decrease the motor driving voltage VM to be supplied to the motor 4.

Abstract: For reproducing information recorded on an optical disc, a pickup is used to detect a target track on the disc through an optical beam. In carriage servo control, movement of the pickup is servo-controlled in the radial direction of the optical disc. In this control, a tracking error signal is produced by a preamplifier. A pulse signal is produced, in which the period of the pulse signal is set to a constant amount corresponding to the accuracy of movement of the pickup. The duty ratio of the pulse signal is changed based on characteristic of the error signal, so that a changed pulse signal is produced. The changed pulse signal is multiplied by the tracking error signal, so that a carriage control signal is produced. The carriage control signal is supplied to a carriage motor by a driver, so that the pickup is moved.

Abstract: A brake signal generating circuit and method for improving the efficiency of a lens brake in an optical disc reproducing system are provided.

Abstract: a data player or a method in which a reading and/or writing head is positioned according to anyone of 3 methods or combinations thereof: Calculating a desirable speed curve to position the head from a first to a second position and adjust the speed of the head's movement to the desirable speed, calculating and outputting an amount of energy to a driving mechanism to move the head a determined number of steps, increasing the power applied to a driving mechanism until the head is moved for one step. The positioning may additionally be used to perform coarse positioning while the head is positioned on a track of a data medium using a fine positioning mechanism.

Abstract: The invention provides an adaptive brake force setting system. Every time when a pickup head with a predetermined mass crosses a plurality of recording tracks in an optical recording media, the system is used for selling brake force to make the pickup head stop from a predetermined initial brake position to a target recording track. The system comprises a detecting module and an estimating module. The detecting module is for detecting a final velocity and an acceleration of the pickup head when the pickup head arrives at the initial brake position. The estimating module is for, according to the final velocity and the acceleration, using a predetermined brake force estimating process to estimate the brake force exerted on the pickup head at each time for making the pickup head stop to the target recording track in a predetermined braking time. Therefore, the pickup head stop exactly to the target-recording track.

Abstract: A tracking access control method for an optical storage medium drive is used for reading data stored in an optical storage medium. The optical storage medium drive has a sled capable of sliding in a radial direction of the optical storage medium. The method is capable of exerting a brake force on the sled according to a sliding speed of the sled relative to the optical storage medium when the sled is located at an intermediate position in a sliding course from an initial position to a target position on the optical storage medium.

Abstract: A magneto-optical recording medium processing apparatus of the present invention limits, via a predetermined current limiting means, the bias current applied to a bias coil during seek, when a seek current is applied to a carriage. In accordance therewith, it is possible to reduce the peak of the sum current, which is the total of the seek current and the bias current, and the current consumption of the entire apparatus can also be curbed. Current limiting means, for example, sets a bias current that is smaller than the specified value of the bias current required at media access time, and sets a bias current value such that the total of the seek current and bias current does not exceed an allowable current.

Abstract: The present invention provides an optical disk device that reduces a track lead-in time associated with a seek time. A switching means 50 includes a multiplier A 11 for multiplying an output of a speed control means 5 by &agr; and a multiplier B 12 for multiplying an output of a position control means 6 by (1−&agr;), and an adder 13 for adding an output of the multiplier A 11 and an output of the multiplier B 12 to output a result of the addition as control input to an actuator driving means 8. At the time of movement of an optical pickup 3 toward a target track, the multiplier factor &agr; for the multipliers A 11 and B 12 is set at 0, thereby performing control of the actuator driving means 8 by means of the position control means 6.

Abstract: Creation of the electronic invention is the result of an individual's natural progression to create a digital photo album from archived CDs containing digital photo images. The invention will only read images that are within an inserted CD. It will be approximately the size of a hand-held photo album. This simple electronic device will display only common formatted images that are on a CD (eg, jpg). A scroll feature will display any image on the CD. Displayed images on the product's screen can also be outputted to a television set. Output will be controlled by the invention. Product will also be rechargeable. Patent will explore necessary accessories based on function. Device will be autonomous; it will not be attached to a computer.

Abstract: A track jump apparatus for accessing an optical record medium and the position detection method thereof. The track jump apparatus moves the light spots of the laser beam from the current track to the object track. The track cross velocity and position are stably and precisely controlled during the track jump operation. When pulling in, the track cross velocity is controlled within the control band of the track servo loop, and the stability of the track servo loop is not affected. With track position detection, the apparatus adopts a hybrid track detection method, which generates the track position according to the linear area of a tracking error signal and a focus sum signal.

Abstract: In a scanning apparatus, a scanning spot is moved along a path from one track to another track of the information carrier, the scanning spot is accelerated in a first stage of the movement and decelerating in a second stage of the movement. Initially during the movement a displacement of the scanning spot is derived from a first and a second position signal. The velocity of the scanning spot is estimated during movement along the path. After the estimated velocity of the scanning spot exceeds a first predetermined value during the first stage of the movement, the displacement of the scanning spot is derived from the first position signal and independent from the second position signal, during movement along the path. After the estimated velocity has decreased below a second predetermined value during the second stage of the movement, the displacement of the scanning spot is again derived from both the first and the second position signal, during movement along the path.

Abstract: After an optical disk drive is powered on, a predetermined force is provided to a sled motor. When the predetermined force is provided, a duration of the pickup head module sliding from an inner region to an outer region of an optical disk is measured. A correction coefficient is obtained from the ratio of the measured duration and an ideal duration. Thereafter the force of the sled motor is corrected by the correction coefficient. This reduces differences of reading/writing time among individual optical disk drives.

Abstract: When a lens 4a reaches a position which is a half track short of an objective track in a track jump, a servo processor 7 conducts a braking operation of an amount corresponding to the movement velocity of the lens 4a at the timing when the lens crosses the immediately preceding track. The movement velocity of the lens 4a is detected from the period of a tracking error signal. Therefore, a phenomenon in which a braking operation is not effective and the lens overshoots the objective track is prevented from occurring, and a track-on in the objective track can be surely attained.

Abstract: The invention provides an adaptive brake force setting system. Every time when a pickup head with a predetermined mass crosses a plurality of recording tracks in an optical recording media, the system is used for selling brake force to make the pickup head stop from a predetermined initial brake position to a target recording track. The system comprises a detecting module and an estimating module. The detecting module is for detecting a final velocity and an acceleration of the pickup head when the pickup head arrives at the initial brake position. The estimating module is for, according to the final velocity and the acceleration, using a predetermined brake force estimating process to estimate the brake force exerted on the pickup head at each time for making the pickup head stop to the target recording track in a predetermined braking time. Therefore, the pickup head stop exactly to the target-recording track.

Abstract: A method for controlling an optical pickup head of an optical processing apparatus is provided. A first lead-lag compensator is disabled and a second lead-lag compensator is enabled when the optical pickup head switches from a following mode to a seeking mode. Then, an initial operating factor of the second lead-lag compensator is determined according to a last input value and a last output value of the first lead-lag compensator. An initial kick force of the actuator in the seeking mode is calculated by realizing the last input value and the last output value of the first lead-lag compensator immediately before the first lead-lag compensator is disabled. Finally, the optical pickup head is actuated to perform a seeking operation with the initial kick force.