Abstract: The present disclosure relates to a method for controlling zero-return of a servo of a robot, and a servo and a robot with enhanced zero-return. The method includes: outputting an activation command to a motor, and reading a default zero-point of the motor (w1) and a default zero-point of an output shaft of the speed reducer (w2). The output shaft of the motor (w1) is driven to return until the default zero-point of the output shaft of the speed reducer (w2) is the same with the current position of the output shaft of the speed reducer (w4) in response to the default zero-point of an output shaft of the speed reducer (w2) being not the same with the current position of the output shaft of the speed reducer (w4).

Abstract: An encoding method generates an encoded sequence by performing encoding of a given coding rate according to a predetermined parity check matrix. The predetermined parity check matrix is a first parity check matrix or a second parity check matrix. The first parity check matrix corresponds to a low-density parity check (LDPC) convolutional code using a plurality of parity check polynomials. The second parity check matrix is generated by performing at least one of row permutation and column permutation with respect to the first parity check matrix. An eth parity check polynomial that satisfies zero, of the LDPC convolutional code, is expressible by using a predetermined mathematical formula.

Abstract: A processor includes a plurality of packed data registers, a decode unit, and an execution unit. The decode unit is to decode a three-dimensional (3D) Morton coordinate conversion instruction. The 3D Morton coordinate conversion instruction to indicate a source packed data operand that is to include a plurality of 3D Morton coordinates, and to indicate one or more destination storage locations. The execution unit is coupled with the packed data registers and the decode unit. The execution unit, in response to the decode unit decoding the 3D Morton coordinate conversion instruction, is to store one or more result packed data operands in the one or more destination storage locations. The one or more result packed data operands are to include a plurality of sets of three 3D coordinates. Each of the sets of the three 3D coordinates is to correspond to a different one of the 3D Morton coordinates.

Abstract: A system, device, and method for recording audio with the character and sonic benefits of a genuine analog recording is disclosed. More specifically, an electro-mechanical-software controlled closed loop analog signal processor (“CLASP”) system which is comprised of a CLASP unit containing firmware, a latency detection module, and CLASP hardware display and controls. The CLASP system further comprises CLASP software operably running on a digital audio workstation (“DAW”) which is also in operable communication with the CLASP unit. The CLASP unit is also in operable communication with an analog recordable medium. An analog audio signal is recorded on the analog recordable medium, which may consist of a coated tape, cup, cylinder, drum, or disk, and then immediately played back and routed to the DAW via an analog to digital converter, thus providing for digitally recorded analog audio. The CLASP system may also include converters and a mixing console.

Abstract: An optical disc device includes an optical pickup and a controller. The optical pickup is configured to emit light to an optical disc and detect the light reflected on the optical disc. The controller is configured to perform adjustment of at least one of spherical aberration, focus balance and lens tilt of the optical pickup based on a reproduction signal corresponding to the light detected by the optical pickup. The controller is further configured to perform the adjustment based on a level of the reproduction signal of adjustment-use recording. The controller is further configured to perform re-adjustment after performing subsequent adjustment-use recording in response to the level of the reproduction signal of the adjustment-use recording being at or below a specific threshold after the adjustment.

Abstract: According to one embodiment, a circuit for generating a signal has an amplifier, first and second detection circuits, first and second A/D converters, and a digital signal processing circuit. The amplifier amplifies an electric signal corresponding to an intensity of a reflected light from an optical disc. The first detection circuit detects an upper envelope of an output signal from the amplifier, and outputs an upper envelope signal. The second detection circuit detects a lower envelope of an output signal from the amplifier, and outputs a lower envelope signal. The first A/D converter converts the upper envelope signal into a first digital signal. The second A/D converter converts the lower envelope signal into a first digital signal. The digital signal processing circuit performs calculation processing of the first and the second digital signals, and outputs a signal for controlling reproduction of data recorded on the optical disc.

Abstract: The optical disc comprises a substrate layer, a read-only data layer having a pit/land data structure including user data and control data arranged in tracks on the substrate layer, and a nonlinear layer with a super-resolution structure disposed on the data layer, wherein the control data are correctly readable only by including a reverse rotation of the disc. The control data include in particular a protection code for the disc, for example a copy protection code, so that the user data of the disc are only readable after reading of the control data.

Abstract: The invention provides a driving circuit for a voice coil motor. In one embodiment, the driving circuit includes a logic circuit, a digital-to-analog converter, and an output circuit. The logic circuit generates a series of samples of a digital output signal according to a digital input signal, wherein the samples of the digital output signal sequentially alter from a first input value of the digital input value to a second input value of the digital input signal according to an alteration pattern determined by a mode selection signal. The digital-to-analog converter converts the digital output signal to an analog output signal. The output circuit generates a driving current signal according to the analog output signal for driving the voice coil motor.

Abstract: An optical disc device and information recording/reading method for an optical disc in which a recording layer is formed through volume recording by aligning recording tracks, which hold information, in a homogenous recording region that does not internally have a layer defining a recording position. The information recording method includes a step in which a first recording layer forming a complex recording layer is formed by forming a recording track while recording information by focusing a main beam at a predetermined depth position in the recording region, and a step in which a second recording layer forming the complex recording layer is formed by forming a recording track while recording information by focusing the main beam at a depth position that is separated from the first recording layer in a depth direction by a depth offset greater than ? of a wavelength of the main beam.

Abstract: A method of controlling a tracking error balance in an optical disc apparatus, and the optical disc apparatus are discussed. In an embodiment of the present invention, when a tracking error balance for writing is controlled, a beam power that is appropriate for the writing characteristics of an optical disc is applied. The beam power can be determined based on the Manufacturer Identifier (MID) of the optical disc and writing power information for different MIDs. The beam power can be determined to be a value of 20 to 50% of the prestored writing power for the MID of the optical disc.

Abstract: Method and apparatus for compensating for differences in translation path geometries of transducers used to access a data storage medium. A compensation profile is generated in relation to radial error between a first translation path geometry of a first transducer and a different, second translation path geometry of a second transducer. A control circuit directs the first transducer to write data to a rotatable data storage medium in relation to the compensation profile to emulate the second translation path geometry. In some embodiments, the control circuit comprises a data signal clock generator, a motor rotation clock generator, and a transducer radial translation clock generator. A nearest pulse detector identifies a closest clock signal pulse to a once-per-revolution (OPR) rotational reference, and the control circuit adjusts a frequency of the associated clock signal coincident with the closest pulse.

Abstract: Compatibility information embedded in an optical medium modifies actions allowed by predetermined non-compatible optical disc drives on the optical medium, such as optical disc drives that may suffer damage if certain actions are performed on the optical medium. For instance, a compatibility engine of the optical disc drive applies compatibility information read from an optical medium to determine restrictions to impose on the use of the optical medium, such as restricting the optical disc drive from writing to the optical medium, reading from the optical medium or performing any operations until an update to the optical disc drive firmware is performed either automatically or by display of a compatibility user interface at an information handling system associated with the optical disc drive. In one embodiment, the compatibility information identifies incompatible optical disc drives and firmware versions by unique identifiers.

Abstract: An optical disk drive includes a non-volatile memory. The optical disk drive is booted based on driving information stored in the non-volatile memory. When a write command is received from a host, the optical disk drive stores data to be recorded in an optical medium in the non-volatile memory and then writes the data in the optical medium independent of the host.

Abstract: Provided is a computer system including: a computer running as a DB server; a storage system including a plurality of disk drives for storing data; and a management module, in which: at least one of the plurality of disk drives stores data of a DB schema written by the computer; the management module specifies the DB schema to be accessed based on a received query, transmits, to the storage system, an instruction to copy at least a portion of the data of the specified DB schema from the disk drive to a memory, and transmits, to the storage system, an instruction to control an rpm of the disk drive that stores the data of the specified DB schema; and the storage system controls the rpm of the disk drive based on the instruction. Accordingly, power consumption of the storage system can be reduced even if installed disks increase in number.

Abstract: To provide an information record controlling apparatus which can move and record recorded information more efficiently, and more efficiently administrate move and record. In the information recording and reproducing apparatus 1, CPU 2 administrates and controls recorded information, which is constituted by a plurality of information units. Further, the CPU 2 controls move and record of the recorded information, which are carried out with respect to each of the information units, on the basis of reproduction able and disable information with respect to each of the information units.

Abstract: An information recording apparatus is for recording user data and recording management data onto an information recording medium being provided with: a first recording layer; and a second recording layer, each of the first recording layer and the second recording layer having a user data area to record therein at least the user data and a recording management area to record therein at least the recording management data for managing recording of the user data, the information recording apparatus is provided with: a recording device for dividing the recording management area into a plurality of recording management segments and for recording the recording management data into at least one of the plurality of recording management segments; and a first controlling device for controlling the recording device to dispose each of the plurality of recording management segments in a single recording layer.

Abstract: An optical disk apparatus which can carry out tilt control using a signal of a focus control system so as to improve the recording/reproducing performance of an optical disk. The optical disk apparatus includes a motor which rotates the optical disk, an optical pickup which reads at least information from the optical disk being rotated by the motor, a first memory which uses information of a rotation angle of the optical disk from the optical pickup as an address, a second memory which stores an offset by which information stored in the first memory should be shifted and then read, and a control portion which reads the information stored in the first memory after shifting the information by the offset stored in the second memory and which carries out tilt control using the read information.

Abstract: The present invention sets forth a method and a system for calibrating optimized power of an optical pick-up unit of an optical disk drive. The system comprises a micro-processor, and a signal processor. The micro-processor coupled to the optical pick-up unit sets an initial power corresponding to an optical disk, and calculates a predetermined number of power levels to cover the range of the initial power for performing a recording procedure. The signal processor coupled to the micro-processor determines whether a servo state failed during optimized power calibration, and calculates recording performance of each power level. The signal processor transmits the servo state and the recording performance to the micro-processor for determining the optimized power.

Abstract: A recording apparatus is provided with: a recording device for recording a data pattern onto a recording medium provided with a user data area; a first controlling device for controlling the recording device to record the data pattern for adjusting the recording condition into an area portion which is outer than an end on an outer side of a recording-scheduled area portion and in which the data pattern is scheduled to be recorded; a reading device for reading the data pattern recorded by the control of the first controlling device, thereby obtaining a read signal; a measuring device for measuring jitter of the read signal; an adjusting device for adjusting a recording condition such that the jitter satisfies a desired condition, and a second controlling device for controlling the recording device to start the recording into the recording-scheduled area portion by using the recording condition adjusted by the adjusting device.

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: Provided are an optical disk drive and an advertisement/service system using the same. The optical disk drive includes an optical disk storage unit, an Internet link storage unit, and a controller. The optical disk storage unit stores or reproduces contents using an optical disk. The Internet link storage unit stores an Internet link in an inside and is executed as a virtual optical disk when the optical disk is not presentpresentontroller controls the optical disk storage unit and the Internet link storage unit, and controlling an access to be made, subject to the Internet link storage unit. The service system using the optical disk drive includes a user terminal, an optical disk service network, and a network connecting the user terminal and the optical disk service network. The user terminal includes an optical disk drive configured to allow an Internet link.

Abstract: An information reproducing method includes the steps o of reading information from an information medium that is rotated, and determining a rotation velocity of the information medium on the basis of a data transfer rate based on a specification of a read request.

Abstract: A first light source 1a emits a first light flux with a first wavelength. A second light source 1b emits a second light flux with a second wavelength that is different from the first wavelength and a third light flux with a third wavelength that is different from the first wavelength and the second wavelength. A collimator lens 6, a first objective lens 9, and a second objective lens 10 collect the first to third light fluxes as converged light on an optical disc. A first composite photodetector 13 detects the reflected light fluxes from the optical disc. The first composite photodetector 13 includes a first quartered light-receiving unit 13a that receives a light flux obtained by reflection of at least one light flux from among the first to third light fluxes from the optical disc and a second quartered light-receiving unit 13b that receives a light flux obtained by reflection of the remaining light fluxes from the optical disc.

Abstract: A system, apparatus, device, and method for recording sounds and music with the character and sonic benefits of a genuine analog tape recording is disclosed. More specifically, an electro-mechanical-software controlled closed loop analog signal processor (“CLASP”) system, which is comprised of a digital audio workstation (“DAW”) resident on a host computer and is in operable communication with a CLASP unit or device is disclosed. The CLASP unit, which contains firmware, is also in operable communication with a tape recorder transport which is comprised of a tape mechanism transport and a control unit. In one embodiment, an analog audio signal is recorded on an analog tape and then immediately played back and routed to the DAW via an analog to digital converter, thus providing for digitally recorded analog audio. Typically, after the analog recorded signal is played back, it is erased from the tape which generally continues to cycle.

Abstract: A reproduction apparatus includes a storage part which stores a plurality of items of contents data; reproduction means for reproducing contents in any one of reproduction modes including a normal reproduction mode that reads the contents data stored in the storage part in a predetermined order for reproduction, and a recommend mode that selects one part of the contents data stored in the storage part as a recommended piece of music for reproduction; and reproduction mode control means for changing the reproduction mode in the reproduction means to the recommend mode when a predetermined recommend mode changing condition is satisfied.

Abstract: A recording or reproduction apparatus is disclosed which optimizes a standby state for recording or reproduction of a cartridge disk and can achieve rapid restoration of recording action upon ejection. A shutter close mode wherein a recording medium in a cartridge recording medium is not driven by a driving section and a shutter mechanism is closed can be maintained as one of modes during a loading process of the cartridge recording medium to achieve a dust preventing effect, a collision preventing effect with a head and a power saving effect while the cartridge recording medium is in a standby state. If a request to discharge the cartridge recording medium is issued, then the successive changeover from a drive on mode to a drive off mode shutter close mode eject mode is controlled using individual commands for the modes.

Abstract: A servo control apparatus includes: a drive section that applies a thrust to move a driven object; a storage section that stores a control circuit output initial value; an approaching control section that moves the driven object toward a target position; an error signal detection section that detects an error signal varying according to a difference between the position of the driven object and the target position; a start position calculation section that calculates a start position of a servo control process; an arrival detection section that detects whether the driven object reaches the start position; a control circuit initial value calculation section that calculates a control circuit initial value of a control system and supplies it to a control circuit of the control system; and a servo control starting section that starts the servo control process when detecting that the driven object has reached the start position.

Abstract: In a content reproducing system (1), which includes: a program judging unit (31) that judges whether or not a BD-J program being executed is a continuing program when an eject operation for a BD is detected during reproduction control in which reproduction of a content is controlled by execution of the BD-J program; and a reproduction control management unit (21) that causes the reproduction control performed by the BD-J program to be stopped if the BD-J program is not the continuing program and performs switching to the reproduction control for the content based on any one of media excluding the BD (41), the reproduction control based on execution of the continuing program is continued if the BD-J program is the continuing program.

Abstract: An information reproducer (1) includes a element (15) for reproducing content data, a first setting element (20) for setting first loop reproduction unit data, a conversion element (20) for generating conversion data by dividing or elongating/contracting a plurality of unit beat data each corresponding to one beat included in first loop reproduction unit data, a second setting element (20) for setting second loop reproduction unit data where (i) the reproduction period is substantially identical to that of the first loop reproduction unit data, and (ii) a beat appears at a timing synchronous with that of a beat appearing in the first loop reproduction unit data by combining the conversion data, and a element (20) for controlling the reproduction element to perform loop reproduction of the first loop reproduction unit data and the second loop reproduction unit data.

Abstract: In an optical disk recording method of recording data onto a recordable optical disk which includes a data zone where data is recorded and a management data zone where management data indicating the recorded part of the data zone is recorded, an extended management data zone in which the management data is to be recorded is set in the data zone in response to an extension instruction.

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 apparatus for controlling a maximum rotational speed of a recording medium, are discussed. The method according to an embodiment of the present invention includes determining an imbalance error of the recording medium, and variably setting a maximum rotational speed of the recording medium based on the determined imbalance error.

Abstract: An information recording apparatus is for recording user data and recording management data onto an information recording medium being provided with: a first recording layer; and a second recording layer, each of the first recording layer and the second recording layer having a user data area to record therein at least the user data and a recording management area to record therein at least the recording management data for managing recording of the user data, the information recording apparatus is provided with: a recording device for dividing the recording management area into a plurality of recording management segments and for recording the recording management data into at least one of the plurality of recording management segments; and a first controlling device for controlling the recording device to dispose each of the plurality of recording management segments in a single recording layer.

Abstract: A reproducing apparatus includes a storage unit having a plurality of content data stored therein, a reproducing unit reading out the content data stored in the storage unit and reproducing the read content data, and a driving unit driving a predetermined driven unit according to the content of the content data reproduced in the reproducing step. The reproducing unit has two reproduction modes, that is, a normal reproduction mode in which the content data stored in the storage unit are reproduced in a predetermined order and a recommend mode in which some of the content data stored in the storage unit are selected as recommended music files and the selected content data are reproduced. When the reproducing unit operates in the recommend mode, the driving unit drives the driven unit more quickly than in the normal reproduction mode.

Abstract: An information reproducing method includes the steps o of reading information from an information medium that is rotated, and determining a rotation velocity of the information medium on the basis of a data transfer rate based on a specification of a read request.

Abstract: A system and method for controlling the position of an optical head of a disc during high speed recording. In one embodiment of the method, an optical disc has a plurality of tracks. The method comprises implementing CLV recording by said optical drive, determining a wobble signal based on address information contained in said plurality of tracks of said optical disk and determining a wobble clock signal based on said wobble signal. The method further comprises decoding said wobble clock signal by a decoder, said decoder to provide a sync clock signal to an encoder loop circuit, said sync clock signal based on said wobble clock signal generating an encoder clock signal using said encoder loop circuit. In addition, the method comprises comparing said sync clock signal to said encoder clock signal to provide a position command to position the optical head of said optical drive.

Abstract: An optical disc has a security feature in the form of an RFID tag that communicates with a voltage controlled optical modifier layer in the optical disc. In the presence of an interrogation signal, the RFID tag allows the optical disc to be used normally by outputting a voltage to the optical modifier layer. In the absence of an interrogation signal, the optical modifier layer prevents a laser from reading from or writing on the optical disc. Other embodiments are also disclosed.

Abstract: An optical disc has a security feature in the form of an RFID tag that communicates with a voltage controlled optical modifier layer in the optical disc. In the presence of an interrogation signal, the RFID tag allows the optical disc to be used normally by outputting a voltage to the optical modifier layer. In the absence of an interrogation signal, the optical modifier layer prevents a laser from reading from or writing on the optical disc. Other embodiments are also disclosed.

Abstract: A method and apparatus for recording information with improved capabilities of suitably updating numerous setting items addressing the change in recording velocity of an optical disc caused during information recording. The method for recording on the surface of the optical recording disc by a laser beam emanated from a light source, comprises, in case when a recording velocity changes during an operation of recording information, the step of selecting setting items out of a plurality of items, in which the setting items may affect to a degrade recording quality with the change in the recording velocity and the plurality of items are used for determining the shape of pulsating laser beam; identifying a set of the items to be updated including the setting items; and updating the set item by item to values suitable for the present recording velocity at a predetermined time interval while continuing the operation of recording information.

Abstract: A device for controlling zero-return of an opto-mechanical system of an optical disc drive is provided. The opto-mechanical system has an optical pickup head for reading data from an optical disc. The zero-return controlling device includes a servo system, a stepper motor driver chip and a signal detecting unit. The servo system issues a triggering signal when the optical disc is loaded. The stepper motor driver chip issues a stepper motor driving signal to the stepper motor in response to the triggering signal. The stepper motor is driven to rotate in response to the stepper motor driving signal. The signal detecting unit is used for detecting the magnitude of the stepper motor driving signal. A suspending signal is issued from the signal detecting unit to the stepper motor driver chip to stop the stepper motor if the magnitude of the stepper motor driving signal exceeds a threshold value.

Abstract: A detachable optical driver includes a detachable box, a signal import and export device installed in the detachable box, a playing platform; and an encoding/decoding module connecting to and positioned inside the playing platform for being able to export said data to a display facility. The detachable optical driver is a modulized design by enhancing a media playing platform with detachable various functions, such as CD-ROM, CD-RW, DVD-ROM, DVD-RW, DVD-Dual and digital camcorder, home gateway, media database and so on. When the reading device of the optical drive malfunctions, only that malfunctioned reading device needs to be changed.

Abstract: The present invention relates to determining a data writing speed for writing data on a medium (112, 40, 50), using a predetermined writing power, comprising writing a test data sequence on the medium using a first data writing speed (step 204), reading the written test data sequence from the medium (step 206), determining a written data error measure for the written test data sequence (step 210), and selecting a lower second data writing speed if the written data error measure is higher than a written data error threshold (steps 212, 216). It also relates to writing data on a medium, using a data writing speed, comprising writing data on a first part (56) of the medium (50, step 312), using the first data writing speed, and writing data on a second part (54) of the medium (50, step 314), using a speed related to the second data writing speed.

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 reproduction apparatus is provided which reproduces, from a hologram recording medium on which digital data are recorded as an element hologram formed from interference fringes generated by interference of imaged data of the digital data as object light with reference light, the digital data. If a synchronization signal recorded in advance in a predetermined region of the hologram recording medium is detected successfully, then it is decided that the tracking state with regard to the element hologram is favorable. In this instance, signal processing is performed the image picked up from the element hologram to reproduce the digital data.

Abstract: The invention discloses a method for operating an optical drive for e.g. a CD, DVD, HD-DVD or a BD disk. More specifically, the invention may improve the signal to noise ratio (SNR) and/or the carrier to noise ratio (CNR) during readout from an optical carrier by an optical drive by applying a low pass filter on a signal comprised in a data channel or an auxiliary channel of the optical drive. The low pass filter has a bandwidth frequency (f0) that is dependent on the tangential linear speed (v1) of the light beam (5) on the optical carrier. Thus, the present invention provides a dynamic way of setting the bandwidth of a low pass filter in the data channel, or an auxiliary channel. The present invention also relates to a corresponding optical drive.

Abstract: A signal gain control method and system for use in optical disc drives to prevent undesirable saturation occurrences in circuit operations. The method includes fetching a preset reading front monitor diode signal and a preset gain controlling signal for reading; generating a front monitor diode signal by a front monitor diode signal conversion circuit; calculating a gain controlling signal based on the preset gain controlling signal for reading, the preset reading front monitor diode signal, and the front monitor diode signal by a signal processor; adjusting a gain for detection signals according to the gain controlling signal by a gain adjustment unit; and generating control signals according to the adjusted detection signals by a pre-amp module.

Abstract: According to the invention, an optical disc reproducing apparatus includes a housing for: a reading section which reads data recorded on an optical disc, a data storing section and a reproducing section which reproduces the stored data. A reference discal unit outside the housing rotates at a pre-determined reference rotational speed and direction. An operation discal unit mounted on the reference discal unit, may rotate at a desired speed and direction. A detection discal unit is coupled with the operation discal unit, to rotate in sync with the operation discal unit. First and second detecting sections detect a rotational speed and direction of the detection discal unit and the reference discal unit, respectively. A control section determines the rotational speed and direction of the detection discal unit based on detected results and controls the reading section, the storing section and the reproducing section, thereby performing a desired data reproduction.

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: One embodiment includes providing control information, wherein the control information includes one or more recording speed flags indicating respectively whether one or more recording speeds are applicable to each of the recording layers. The control information also includes write strategy information depending on each of the applicable recording speeds, and the control information is recorded on a specific area of the recording medium.

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.