Abstract: In an information recording medium, positions of pits are modulated in a direction intersecting a direction of reading of pits, so that a predetermined information is recorded. In this information recording medium, the whole of the predetermined information or a part of the predetermined information is randomized through the used of spread spectrum.

Abstract: In one embodiment the method includes reading speed information from a specific area of the recording medium. The speed information includes one or more speed flags to indicate whether a corresponding speed is applicable to the recording medium. A first speed flag for a first recording speed lower than a second recording speed is set to be dependent on a second speed flag for the second recording speed. Data is recorded on a main data area of the optical recording medium based on the read speed information.

Abstract: A recording method for an optical disk drive is implemented as follows. First, at least one of the level of the focusing error signal, the level of the tracking error signal, a wobble synchronization pattern loss, the error rate of demodulating a wobble signal, the frequency of buffer under-run occurrence, the temperature of the drive, the wobble jitter and the level of write power is detected. If at least one detected value exceeds the preset value, the recording will be ceased. Then, the rotation speed of the optical disk drive is decreased, and the recording is resumed with the decreased rotation speed. If at least one of the temperature of the drive, the wobble jitter and the estimated write power exceeds the reset value before recording starts, the rotation speed of the optical disk drive is decreased before recording.

Abstract: Embodiments of methods and systems for controlling access to information stored on memory or data storage devices are disclosed. In various embodiments, fluid-mediated modification of information or access to information is utilized. According to various embodiments, data storage devices designed for rotating access are described which include rotation-activated fluid control mechanisms.

Abstract: A method and apparatus for writing data to a rewritable ultra-speed disc using an optimum pulse at a write speed of the disc, based on Absolute Time in Pre-groove (ATIP) information. The method includes: reading a disc code from the disc; determining a write speed of the disc from the read disc code; and writing data to the disc. The writing is at the determined write speed and according to a write strategy when the write strategy for the lead-in area is determined to be present, and is according on a default write strategy when the write strategy for the lead-in area is determined not to be present.

Abstract: An information storage medium includes areas of disk-related information having disk-related information to record or reproduce data with respect to the information storage medium, wherein the disk-related information includes common disk-related information and changeable parameter information, and the areas of the disk-related information are arranged according to information about the changeable parameter information.

Abstract: Method and device for generating a control voltage for a position actuator of a disk drive system for displacing a lens of a pick-up unit to a given X-position. The actuator is operated by an open loop control system. First, parameters of the control system are calibrated so that the control system produces a control voltage (Va) from an input position signal (Xact setp). Then, the control voltage is processed in a feed forward system for generating a processed control signal (Va_p) which is fed to the position actuator for displacing said lens to the X-position. A Z-value corresponding to the axial distance of the lens from a calibrated axial position and a temperature of the pick-up unit are measured. The position actuator operates according to the formula: Xdc=Va_p*K(Temp,Z)/(R(Temp)* C(Temp,Z)) in which: Xdc=position signal for said given position Va_p=Va processed K=property of ‘actuator’ 21: Newton/Ampere R=resistance of ‘actuator’ coil C=Spring constant in Newton/meter.

Abstract: A method of recording disc control information in a recordable optical disc including at least one recording layer is provided. Writing speed information and per writing speed write strategy are included in disc control information. The specified disc control information can be uniformly applied to efficiently cope with the record/playback of the optical disc. In configuring disc control information within a management area of an optical disc, the method includes recording a plurality of recording speed informations and a plurality of write strategies respectively associated with corresponding recording speeds within the disc control information wherein one of the recording speed informations is a basic recoding speed information.

Abstract: A method and system for controlling the spin rate of an optical device. A device driver provides notification that media has been inserted into the optical device. A control service determines the format of information on the media. The spin rate of the optical device is locked or unlocked based on the format.

Abstract: The disclosure pertains to a scratch effect controller for use by a disk jockey, wherein at least one electromagnet creates the slippage tension or friction effect between the user manipulated disc, which includes a vinyl-like surface thereby simulating a vinyl record, and the rotatable or fixed platter. The strength of the electromagnet is variable so as to create a variable slippage tension or friction effect.

Abstract: There is provided a disk apparatus adapted to allow the rotational frequency of an optical disk to reach a predetermined rotational frequency soon for shifting to a reproducing operation, when setting up the rotation of the optical disk, even if the optical disk may have a large weight. The change in the rotational frequency of an optical disk is detected at a predetermined time interval; the rotational acceleration of the optical disk is calculated based on the detected change in the rotational frequency of the optical disk at the predetermined time interval; it is determined whether or not the weight of the optical disk is greater than that of a reference optical disk based on the difference between the calculated rotational acceleration of the optical disk and the rotational acceleration of the reference optical disk; and the driving voltage of a spindle motor is increased if it is determined that the weight of the optical disk is greater than that of the reference optical disk.

Abstract: The invention relates to a device (9, 109) and a method (501) for determining a critical rotation speed of an optical data carrier (1) at which a critical deflection of said optical data carrier (1) may occur in said device (9, 109), an apparatus (209) and a method for monitoring a condition of an optical data carrier (1), an apparatus (309) and a method for reading data from and/or writing data to an optical data carrier (1), and a device (409) and a method for generating a reference signal to be used for determining a critical rotation speed of an optical data carrier (9).

Abstract: The present invention aims to obtain a position control device which, even if the range within which a mechanical part can be pulled in for position control is narrow, enables quickly stabilizing the pull-in operation.

Abstract: A recording method for an optical disk drive is implemented as follows. First, at least one of the level of the focusing error signal, the level of the tracking error signal, a wobble synchronization pattern loss, the error rate of demodulating a wobble signal and the frequency of buffer under-run occurrence is detected. If at least one detected value exceeds the preset value, the recording will be ceased. Then, the rotation speed of the optical disk drive is decreased, and the recording is resumed with the decreased rotation speed.

Abstract: An optical disc reproducing apparatus includes: a decode processing circuit configured to generate decoded data by decoding encoded data read out from an optical disc such that the decoded data is written into a buffer memory, and to output a write signal to indicate a data rate when the decoded data is written in the buffer memory. A data processing circuit converts the decoded data read out from the buffer memory into an output data, and outputs a read signal to indicate a data rate when the decoded data is read out from the buffer memory. An optical disc rotation control circuit controls a number of rotations of the optical disc based on the write signal and the read signal.

Abstract: A disk drive controls the rotational speed of a disk to an appropriate value. A system controller of the drive stores data read from a disk and read-ahead data into buffer memory. A time interval ti at which the buffer memory becomes full is measured, and the time interval ti is compared with a predetermined lower limit value t1 and a predetermined upper limit value t2. When a relationship of ti>t2 stands, rotational speed is increased. When a relationship of ti<t1 stands, control is performed in such a way that the rotational speed is decreased so as to achieve t1?ti?t2.

Abstract: The present invention relates to a method for determining the rotation frequency of an optical recording medium driven at a constant linear velocity, and to an apparatus for reading from and/or writing to optical recording media using this method. According to the invention, the method includes the steps of: determining the number of tracks relative to a reference position on the optical recording medium based on the current subcode or sector information; and calculating an approximate value for the rotation frequency from the determined number of tracks.

Abstract: A method for recording control information on a recording medium. The method includes generating control information for controlling recording/reproducing data on/from the recording medium. The control information includes a first speed information indicating a maximum recording speed, a second speed information indicating a minimum recording speed, and a third speed information indicating one or more basic recording speeds. The third speed information represents whether each of the basic recording speeds are applicable to the recording medium or not. Thereafter, the method calls for recording the control information on a specific area of the recording medium.

Abstract: When the magnitude of a traverse signal exceeds a predetermined level, the value of a microstep drive signal is changed by one microstep angle so that the rotation angle of the stepping motor changes in a rotation direction in which the magnitude of the traverse signal decreases. A determination is made as to whether or not the magnitude of the traverse signal becomes a predetermined level or less. When the magnitude of the traverse signal does not become the predetermined level or less, the magnitude of the microstep drive signal is returned to the pre-change value and the value of the microstep drive signal is incremented by an additional microstep angle so that the rotation angle of the stepping motor changes in a rotation direction in which the magnitude of the traverse signal decreases.

Abstract: A method for recording/reproducing data on/from a recording medium. The method provides for reading/recording speed information from a specific area of the recording medium, where the recording speed information includes a first information indicating a maximum recording speed, a second information indicating a minimum recording speed, a third information indicating a predetermined recording speed different from the maximum or minimum recording speed, and a fourth information indicating a basic recording speed. Thereafter, the method provides for recording/reproducing the data on/from the recording medium according to the reading/recording speed information.

Abstract: A default gain table stores values of loop gain of a spindle motor control unit predetermined for each number of media. A loop gain setting unit detects the number of media, reads out a loop gain corresponding to the detected number of media from the default gain table and sets it in the spindle motor control unit. A loop gain measuring unit measures the loop gain of the spindle motor control unit during a test in the manufacturing process, adjusts it into an optimum loop gain, and stores it as a default lop gain in the apparatus.

Abstract: A velocity calculator performs high-order calculations of servo frame velocities of a storage media, particularly tape and disk. The velocity calculator employs a servo frame indexing module for generating a first-order preceding servo frame velocity signal indicative of a first-order calculation of a preceding servo frame velocity including a first-order preceding servo frame error term based on first-order current servo frame velocity signal indicative of a first-order calculation of a current servo frame velocity including a first-order current servo frame error term. The velocity calculator further employs a velocity estimating module for generating a higher-order current servo frame velocity signal indicative of a second or higher order velocity calculation of the current servo frame velocity including a higher-order current servo frame error term based on the first-order preceding servo frame velocity signal and the first-order current servo frame velocity signal.

Abstract: An apparatus and a method for memory access of sharing the address and the data buses used in multi-media player, comprising at least one SDRAM, storing the large data and as a buffer in high speed; at least one flash memory, storing the programs, the user's defaults and firmware, wherein the address and data pins of the SDRAM and the flash memory are coupled with a same bus respectively, and SDRAM and flash memory are not accessed at the same time; a memory interface, connecting the address bus and data bus shared by the SDRAM and flash memory. The memory interface further comprises an arbiter, deciding which one of the access requests is executed according to the request priority. It is noticed that only one of the SDRAM or the flash memory can be accessed at one time.

Abstract: A method for compensating for a position error in an optical disc drive (ODD) is provided. The method compensates for a position error generated by a step error associated with a motor which moves an optical pickup unit across a surface of an optical disc. Error data associated with each step of the motor is stored in a memory unit of the ODD, and compensation for the related position error is accomplished by compensating for a track-direction movement of an actuator. The method is particularly useful when conducting a label-printing operation, in that it allows the label printing operation to be performed without generating position errors, gaps, or overwrites on a label surface of the disc, thus enhancing the quality of a label-printing operation and the resulting label.

Abstract: There is provided an information recording medium having a plurality of recording layers (layer L0, layer L1) for recording information. At least one of the recording layers (layer L0, layer L1) has a management information area where recording speed management information defining the maximum possible recording speed when recording information is recorded.

Abstract: A method is disclosed for adjusting the rotational speed of a disk player based on a calculated variable. The method increases the rotational speed of the disk player when the calculated variable is greater than a first threshold and decreases the rotational speed of the disk player when the calculated variable is less than a second threshold.

Abstract: In one embodiment the method includes reading speed information from a specific area of the recording medium. The speed information includes one or more speed flags to indicate whether a corresponding speed is applicable to the recording medium. A first speed flag for a first recording speed lower than a second recording speed is set to be dependent on a second speed flag for the second recording speed. Data is recorded on a main data area of the optical recording medium based on the read speed information.

Abstract: A recording method for an optical disk drive is implemented as follows. First, at least one of the level of the focusing error signal, the level of the tracking error signal, a wobble synchronization pattern loss, the error rate of demodulating a wobble signal, the frequency of buffer under-run occurrence, the temperature of the drive, the wobble jitter and the level of write power is detected. If at least one detected value exceeds the preset value, the recording will be ceased. Then, the rotation speed of the optical disk drive is decreased, and the recording is resumed with the decreased rotation speed. If at least one of the temperature of the drive, the wobble jitter and the estimated write power exceeds the reset value before recording starts, the rotation speed of the optical disk drive is decreased before recording.

Abstract: The disclosure pertains to a scratch effect controller for use by a disk jockey, wherein at least one electromagnet creates the slippage tension or friction effect between the user manipulated disc, which includes a vinyl-like surface thereby simulating a vinyl record, and the rotatable or fixed platter. The strength of the electromagnet is variable so as to create a variable slippage tension or friction effect.

Abstract: An optical disc drive that can carry out recording data to an optical disc such as a format procedure of the optical disc in a relatively short time is provided. An optical disc drive 1 has a rotation driving mechanism for rotating a loaded optical disc 2 at any one of multiple rotational speed (rotation number) levels, an optical pick-up 3 capable of moving in a radial direction of the loaded optical disc 2 to overwrite information (data) onto the optical disc 2 by emitting a laser beam thereto, and an optical pick-up moving mechanism including a sled motor 7 for moving the optical pick-up 3 in the radial direction of the optical disc 2. In a case that the optical disc 2 is a blank disc having no recording history, i.e., in a case of a first recording procedure of the optical disc 2, the optical disc drive 1 carries out recording at a recording speed higher than the highest recording speed for overwriting.

Abstract: The information medium of the present invention is provided with a lead-in region and a data region in which information signals can be recorded, wherein the lead-in region has a recordable portion in which information signals can be recorded. An identifier I1 specifying a recording speed that can be adopted when recording information signals to the data region is provided in the recordable portion of the lead-in region, increasing the precision with which the recording speed is specified.

Abstract: An optical disk apparatus which varies a rotational speed of an optical disk through use of a sound volume controller. A controller of the optical disk apparatus causes a sound volume controller to act as a rotational speed controller upon receipt of a READ command from a host apparatus. The controller detects a set position of the sound volume controller on the basis of a signal output from the same and controls a spindle motor in accordance with a detected position, thereby changing a rotational speed of said optical disk. When wind sound or the like, of the optical disk is obtrusive for the user, the user can diminish noise by means of decreasing the rotational speed through actuation of the sound volume controller.

Abstract: An optical disc drive includes a spindle motor, a control unit, and a detection device. The spindle motor is adapted for rotating an optical disc. The control unit controls rotation of the spindle motor. The detection device is coupled to and is controlled by the control unit to detect the rotation speed change rate of the spindle motor within a predetermined time period, to determine if the change rate detected thereby is smaller than a predetermined reference value, and to generate an output signal received by the control unit to indicate that the spindle motor has reached a state where the rotation speed thereof is stable when the change rate detected by the detection device is smaller than the predetermined reference value.

Abstract: A storage apparatus rotates an optical recording medium at two or more kinds of rotational speeds. The rotational speed is decreased when a read or write margin becomes less than or equal to a first predetermined value or, when a frequency of generation of a servo abnormality of a tracking servo and/or a focus servo is greater than or equal to a first predetermined frequency. On the other hand, the rotational speed is increased when the read or write margin becomes greater than or equal to a second predetermined value or, when the frequency of generation of the servo abnormality of the tracking servo and/or the focus servo is less than or equal to a second predetermined frequency.

Abstract: In a recording material, physical characteristic information of the recording medium, and more specifically, material information representing the material of the disc, is recorded. Accordingly, a recording apparatus and a reading apparatus easily and accurately determine the physical characteristics of the disc, thereby making it possible to provide suitable setting for performing an operation.

Abstract: In an optical recording system, according to a wobble sync signal obtained from a wobble signal associated with a physical track of a recording medium being recorded with input data by a recording module operated in a default constant angular velocity (CAV) recording mode, operation of the recording module can be switched from the CAV recording mode to a constant linear velocity (CLV) recording mode by a mode control switch. The mode control switch is forced to switch operation of the recording module to the CLV recording mode when result of a comparison between a write clock signal generated from the wobble sync signal when the recording module is operated by the mode control switch in the CAV recording mode, and a threshold signal corresponding to a threshold recording speed in the CAV recording mode indicates that the recording mode should be switched to the CLV recording mode but the mode control switch still keep the recording module staying in the CAV recording mode.

Abstract: An error correction circuit for determining an error in rotational speed of a recordable disk of a disk drive includes a sinusoidal error calculation portion adapted to generate a true oscillation error signal, and a summation portion adapted to combine the true oscillation error with a spindle error signal to generate a total error signal. The sinusoidal error calculation portion is adapted to generate a new true oscillation error based on the total error signal.

Abstract: An integrated circuit (IC) for controlling a rotating data storage device comprises a drive module that is implemented by the integrated circuit and that at least one of processes data, stores data and controls operation of the rotating storage device. An audio monitoring module is implemented by the integrated circuit, communicates with the drive module and analyzes audio signals that are based on noise generated by the rotating storage device during operation.

Abstract: A control system for a rotating data storage device, comprises a drive printed circuit board (PCB). A drive module is arranged on the drive PCB and at least one of processes data, stores data and controls operation of the rotating storage device. An audio monitoring module communicates with the drive module and analyzes audio signals that are based on noise generated by the rotating storage device during operation.

Abstract: Within a disk recording/reproducing apparatus for improving a transfer rate when recording/reproducing, and an alternation process method for a disk for it, for recording or reproducing information onto/from an optical disk 100, while conducting a alternation on a defect block within a user data recording area into an alternation area, a controller 500 determines an alternation destination where data of an alternation origin are recorded therein, or a drive speed during the alternation process, upon basis of the position of the alternation origin on the optical disk, when conducting the alternation process.

Abstract: A digital audio signal reproducing device includes a system processor, a first rotation disk, a second rotation disk, a first sensor, a second sensor, and a lighting assembly. The first sensor detects rotation speed and direction of the first rotation disk to output a first control signal. The second sensor detects the second rotation disk being pressed to output a second control signal. When the first control signal and the second control signal are outputted to the system processor simultaneously, the lighting assembly is controlled by the system processor to perform a first blinking mode, and when only the first control signal is outputted to the system processor, the lighting assembly is controlled by the system processor to perform a second blinking mode.

Abstract: The present invention relates to a recording speed determining method of a disk device. The present method, when data record is requested from a host through an interface, a disk device can receive size information about data to be recorded and/or the present time from the host, and determine a recording speed of a disk to be suitable for the received size information and/or for a time zone where the device is located. The disk device can determine such data size and time zone information internally. Thus, it is possible to reduce a noise that is caused from disk rotation if the size of data to be recorded is small or when a noise is felt relatively big. Further, it is possible to determine a data recording speed in accordance with a data size.

Abstract: A rotating recording device, such as an electron beam recorder, is provided with a dual encoder arrangement. A first encoder is employed as a spindle motor controller and located at a first end of a spindle. A second encoder is mounted at a turntable adjacent to a recording surface and used as a position, velocity or clock source for recording the pattern on the substrate. Eccentricity of the mounting of the second encoder is measured against the more accurately mounted spindle control encoder and compensated by a digital clock generating system using a digital phase locked loop.

Abstract: A temperature sensor (131) detects a temperature of a spindle motor (121) of a rotary drive unit (120) for rotating a disk-shaped recording medium (1), and a temperature information acquiring unit (134A) acquires the temperatures as temperature information. An eccentricity detector (132) detects a drive voltage level, and an eccentricity information acquiring unit (134B) acquires the drive voltage level as eccentricity information. When a determining unit (134C) determines that the temperature is higher than a predetermined temperature or that the drive voltage level is higher than a predetermined voltage, a servo controller (133) switches a rotation mode from constant liner velocity to constant angular velocity. That enables stable information processing over a long time with a simple strucure for constant linear velocity.

Abstract: The present invention relates to a method of searching for a recordable position of a writable disk, the method comprising the steps of (a) reading data recording information of the writable disk, the data recording information indicating a position of a last track recorded and a recordable position for data to be recorded; (b) examining whether or not an area after the recordable position indicated by the read data recording information has recorded data; and (c) determining whether to change the recordable position to another position for new input data based on the examination result.

Abstract: When user data fails to be recorded in an address of a user data area, the same data is recorded in an address of a spare area. Information indicating that the data for the address of the user data area is recorded in the address of the spare area is registered in a DL that is loaded in a buffer memory, and the information is recorded in a currently-valid DL area of DMA1. As similar thereto, the information is recorded in a currently-valid DL area of DMA2. If the recording fails, the DL is alternatively recorded in another DL area of the same DMA2. Thereafter, DDSs of DMA2 are deleted, and then, without changing information of the number of times of updating the DDSs, only the staring address of the DL of the DDSs is updated. According to the updating method, it is possible to shorten the time required for updating management information of a medium in an information recording/reproducing apparatus.

Abstract: A speed control method used in an optical disk drive for recording data onto an optical disk includes the following steps: detecting an allowable maximum recording speed of the optical disk and an allowable minimum recording speed of the optical disk, calculating a rotation speed of the optical disk according to the allowable maximum recording speed of the optical disk at an outermost region of the optical disk, calculating a critical position of the optical disk according to the allowable minimum recording speed at the rotation speed, and recording data onto the optical disk at the allowable minimum recording speed between an initial data position of the optical disk and the critical position of the optical disk.

Abstract: An optical disk recording apparatus includes a first comparator, a second comparator, a third comparator, a selection circuit, a control voltage generator, a voltage control oscillator, and a control circuit. The first comparator compares frequency-divided signals to output an error signal. The second and third comparators compare a signal pre-recorded on an optical disk and the frequency-divided signal to output an error signal and a frequency differential signal. The selection circuit selects any one of the error signals to output the signal selected. The control voltage generator generates a control voltage from the signal from the selection circuit. The voltage control oscillator generates and outputs the write reference clock signal having a frequency corresponding to the control voltage from the control voltage generator. The control circuit controls operations of the selection circuit according to the frequency differential signals.

Abstract: The present invention discloses a method of controlling rotating speed of an optical drive. After a plurality of reading requests are issued by a host, the rotating speed of a spindle motor is increased if the time interval between any two reading requests is less than a first time period and the total duration time of issuing these reading requests is more than a second time period.

Abstract: A disk apparatus (10) includes an optical lens (14). A seek operation is performed by moving the optical lens in a radius direction of a recording surface of a magnetooptical disk (40). When the seek operation is being operated, a TE signal detection circuit (26) generates a TE signal based on a laser beam reflected from the recording surface, and applies a generated TE signal to a DSP (34) via an A/D converter (32a). The DSP detects a peak level of the TE signal and a level change amount of the TE signal in a unit time, and generates a tracking actuator control voltage based on the detected peak level and the level change amount. A moving speed of the optical lens is controlled by a generated tracking actuator control voltage.