Abstract: An encoder encodes the captured real-time data into a program stream. A disk authoring transforms the program stream into a disk file format. A disk writer records the disk file format on an optical disk, wherein the disk writer further includes at least two recording speeds. A buffer temporarily stores the program stream or the disk file format during the disk writer stopping the recording action. A sending-path controller notified by the disk writer to switch the data flow between the disk authoring or the disk writer and the buffer, wherein the sending-path controller also can notify the disk writer to switch the recording speeds.

Abstract: Systems and methods are provided for caching media data to thereby enhance media data read and/or write functionality and performance. A multimedia apparatus, comprises a cache buffer configured to be coupled to a storage device, wherein the cache buffer stores multimedia data, including video and audio data, read from the storage device. A cache manager coupled to the cache buffer, wherein the cache buffer is configured to cause the storage device to enter into a reduced power consumption mode when the amount of data stored in the cache buffer reaches a first level.

Abstract: A ring buffer region is divided into a plurality of ring regions. Information is recorded in (or reproduced from) the ring regions from one end of the ring buffer region to the other end of the ring buffer region and from the other end to the one end in the predetermined order. The predetermined order is determined such that the recording (or reproducing) takes place skipping over at least one ring region every time.

Abstract: An information reproducing apparatus in which the compressed information read from a disc is written to the memory, the written compressed information is read out in the order of writing and is supplied to an expansion device to obtain reproduced information. Writing of the compressed information to the memory is stopped when the amount of compressed information written to the memory increases to a first predetermined amount and writing of the compressed information to the memory is restarted when the amount of compressed information written decreases to a second predetermined amount which is smaller than the first predetermined amount and which is an amount corresponding to the compression ratio of the compressed information. The rotation speed of a spindle motor during a writing interruption period is lower than that during a writing period.

Abstract: A continuity maintaining part restarts recording of data onto the optical disk after pause of recording occurring due to buffer under-run, in such a manner that continuity with information recorded immediately before the occurrence of the pause occurred is maintained. A counting part counts the number of times of operation of the continuity maintaining part during the recording of the information onto the optical disk. A display part displays the number of times of operation of the continuity maintaining part counted by the counting part.

Abstract: An information recording device includes a buffer memory, a buffer management unit and a phase adjusting unit. The buffer memory temporarily stores data to be written in a recording medium. The buffer management unit starts writing the data in the recording medium if a size of the data stored in the buffer memory exceeds a first predetermined size, and suspends writing the data in the recording medium if the size of the data stored in the buffer memory becomes less than a second predetermined size. Additionally, the phase adjusting unit starts adjusting a phase error between a signal synchronous to the data and a signal synchronous to a location on the recording medium when the buffer management unit starts writing the data in the recording medium, and finishes adjusting the phase error so that the phase error becomes substantially zero before the buffer management unit suspends writing the data in the recording medium.

Abstract: An optical disk recording and reproducing apparatus comprise, a buffer circuit which receive and store data and output the stored data, an EFM modulation circuit which receive data output from the buffer circuit, adding a frame synchronous signal and sub-code data, subjecting these items of data to the EFM modulation to create record data, a buffer remaining amount control circuit for detecting the remaining amount of data stored in the buffer circuit, a record control circuit for conducting the control for temporarily suspending the recording operation to the optical disk at an arbitrary position of the main data of the record data excluding the frame synchronous signal and the sub-code data in the case where the detection result of the remaining amount of data in the buffer remaining amount control circuit corresponds to the state in which the buffer underrun is generated.

Abstract: A magneto-optical disc 1, for example, that is storage media in which information is stored, is rotated by a spindle motor 2. Reflected light from the magneto-optical disc 1 is detected by an optical head 3 and a detected signal is supplied to a servo circuit 4, which then makes servo operations. Further, upon reproducing operation, information is read out from the detected signal detected from the magneto-optical disc 1. Of the thus read out information, a reproduced RF (radio frequency) signal is processed in a decoding fashion such as modulation by a decoder 6 and written in a buffer memory area of a nonvolatile memory 8 composed of a suitable memory such as an MRAM (magnetic random-access memory). Furthermore, written data is transferred to a codec (coder and decoder) decoder 10 under control of a memory controller 9, in which transferred data is expanded and processed in a reproduced signal processing fashion, thereby resulting in an output digital signal being formed.

Abstract: A recording medium has first and second areas on which first and second information signals are recorded respectively. The first information signal has a size Ya. The second information signal has a size Yb. A head operates for reproducing the first and second information signals from the first and second areas of the recording medium and transmitting the reproduced first and second information signals on a time sharing basis and at a predetermined constant transfer rate Rp while moving between the first and second areas of the recording medium. A buffer memory operates for receiving the first and second information signals from the head at the predetermined constant transfer rate Rp, for temporarily storing the first and second information signals, and for outputting the first and second information signals at first and second transfer rates Ra and Rb respectively. The first and second transfer rates Ra and Rb are lower than the predetermined constant transfer rate Rp.

Abstract: A recording medium has first and second areas on which first and second information signals are recorded respectively. The first information signal has a size Ya. The second information signal has a size Yb. A head operates for reproducing the first and second information signals from the first and second areas of the recording medium and transmitting the reproduced first and second information signals on a time sharing basis and at a predetermined constant transfer rate Rp while moving between the first and second areas of the recording medium. A buffer memory operates for receiving the first and second information signals from the head at the predetermined constant transfer rate Rp, for temporarily storing the first and second information signals, and for outputting the first and second information signals at first and second transfer rates Ra and Rb respectively. The first and second transfer rates Ra and Rb are lower than the predetermined constant transfer rate Rp.

Abstract: A recording medium has first and second areas on which first and second information signals are recorded respectively. The first information signal has a size Ya. The second information signal has a size Yb. A head operates for reproducing the first and second information signals from the first and second areas of the recording medium and transmitting the reproduced first and second information signals on a time sharing basis and at a predetermined constant transfer rate Rp while moving between the first and second areas of the recording medium. A buffer memory operates for receiving the first and second information signals from the head at the predetermined constant transfer rate Rp, for temporarily storing the first and second information signals, and for outputting the first and second information signals at first and second transfer rates Ra and Rb respectively. The first and second transfer rates Ra and Rb are lower than the predetermined constant transfer rate Rp.

Abstract: A recording medium has first and second areas on which first and second information signals are recorded respectively. The first information signal has a size Ya. The second information signal has a size Yb. A head operates for reproducing the first and second information signals from the first and second areas of the recording medium and transmitting the reproduced first and second information signals on a time sharing basis and at a predetermined constant transfer rate Rp while moving between the first and second areas of the recording medium. A buffer memory operates for receiving the first and second information signals from the head at the predetermined constant transfer rate Rp, for temporarily storing the first and second information signals, and for outputting the first and second information signals at first and second transfer rates Ra and Rb respectively. The first and second transfer rates Ra and Rb are lower than the predetermined constant transfer rate Rp.

Abstract: A method, apparatus, and medium for processing data in a Read Only Memory (ROM) drive. The data processing method includes: a ROM drive detecting, buffering, and decoding data at a target location on an optical recording medium; if one of data detection, data buffering, and data decoding fails, checking a CLV speed of the optical recording medium, adjusting a CAV speed of the optical recoding medium, and retrying data detection, data buffering, and data decoding; and if data detection, data buffering, and data decoding are performed successfully, transmitting the decoded data to the host computer. Therefore, it is possible to improve the quality of a ROM drive, by preventing the deterioration of data readability and error generation caused by speed deterioration of the ROM drive, from defects of an optical recording medium.

Abstract: A recording medium has first and second areas on which first and second information signals are recorded respectively. The first information signal has a size Ya. The second information signal has a size Yb. A head operates for reproducing the first and second information signals from the first and second areas of the recording medium and transmitting the reproduced first and second information signals on a time sharing basis and at a predetermined constant transfer rate Rp while moving between the first and second areas of the recording medium. A buffer memory operates for receiving the first and second information signals from the head at the predetermined constant transfer rate Rp, for temporarily storing the first and second information signals, and for outputting the first and second information signals at first and second transfer rates Ra and Rb respectively. The first and second transfer rates Ra and Rb are lower than the predetermined constant transfer rate Rp.

Abstract: This invention comprises additional recording means for recording the data in a predetermined position on an optical disk, then reproducing the data recorded in the predetermined position, and not only detecting the end of the predetermined position but also recording the data again from an unrecorded area following the end and power control means for controlling the recording power in recording the recording data, on the basis of the result of the reproduction in the additional recording.

Abstract: A continuous burn process of a storage medium, performed when the buffer is buffer under run, is disclosed. Whether the data buffer is buffer under run is firstly detected. If buffer under run is to occur to the data buffer, the currently written data block is an incomplete data block. The incomplete data block includes at least a synchronous frame and an incomplete data frame, which is the last data to be burned. The write operation is paused then. When the data in the data buffer reaches a predetermined amount, a new data is written into a superimposed data region of the incomplete data frame. The data in the data buffer is then continuously burned into the subsequent data frame adjacent to the incomplete data frame.

Abstract: A method is provided for controlling a play speed in an optical disc device in which the current play speed is rapidly lowered when the address information of an optical disc such as a CD or DVD is abnormally detected under the condition in which the transfer rate of data temporarily stored in a buffer is a basic speed 1×, and in a sequential play mode for sequentially reading and reproducing A/V data recorded on the optical disc, thereby being capable of efficiently preventing discontinuous reproduction of A/V data caused by the repetition of pause and play operations during the sequential play operation.

Abstract: A real-time reproduction determination unit determines whether or not AV data recorded in recording areas on an optical disc can be reproduced in a real-time manner. If the AV data recorded on the optical disc cannot be reproduced in a real-time manner, a compile simulation unit and a compile execution unit respectively select extents from the AV data recorded on the optical disc and relocate the extents to a relocation area.

Abstract: An information reproducing apparatus for reproducing information recorded on an optical disc. A pickup reads the information, and a track buffer memory temporarily accumulates the information therein. A control micro computer start reproducing the information. Then, the computer stops reproducing while accumulating the information in the memory when stop of the reproduction is requested from an external portion during the reproduction. Further, the computer outputs the information accumulated in the memory to resume reproducing it.

Abstract: A contents data reproducing apparatus that continuously reproduces pieces of music without producing a soundless state between music pieces is provided. When a pickup 2 finishes reading of reproducing object piece of audio data, a microcomputer 10 stops writing of the audio data into a storage unit 4 and makes the pickup move to a front of the next reproducing object piece of audio data to start reading of the next reproducing piece of audio data. Then, when a result in a level detection unit 7 shows that the level of the next reproducing object piece of audio data is higher than the reference level, then, writing of the next reproducing object piece of audio data, which is read by the pickup 2, into the storage unit 4 is started. An audio data conversion unit 8 reads the audio data stored in the storage unit 4 and reproduces it.

Abstract: A power saving system of an optical recording/reproducing apparatus is provided. The optical recording/reproducing apparatus includes a temporal memory which stores reproduced data or recording data in a cyclic data storage stage and from which the stored data is read out for reproduction or recording in a cyclic data readout stage following the data storage stage. The power saving system saves part of power consumed in the apparatus in the data storage stage in a record mode of operation and in the data readout stage in a reproduce mode of operation.

Abstract: A storage unit with shockproof function and accessing method thereof is provided. The storage unit includes a storage media, a speed sensing device or a vibration sensing device and a control unit. The storage unit is capable of operating in an environment with strong vibration and avoiding most read/write errors at a reduced production cost.

Abstract: An information recording apparatus that records information on a recording medium includes a write unit performing a write operation on the recording medium in which data continuity is maintained at an ending and an beginning point of writing information to the recording medium, a stop instruction unit instructing a temporary stop of the write operation during the write operation, a restart instruction unit instructing a restart of the write operation, and a write stop/restart control unit controlling the write unit to stop performing the write operation in response to an instruction of the temporary stop by said stop instruction unit and controlling the write unit to restart performing the write operation in response to an instruction of the restart by the restart instruction unit.

Abstract: To provide an optical disk recording apparatus capable of signal recording onto a disk using a laser emitted from an optical pick-up. Signals temporarily stored in the buffer RAM (10) are read, and recorded onto a disk (1). When the amount of signal data in the buffer RAM (10) decreases below a predetermined amount as signals are read therefrom while the read signals are recorded onto the disk (1), the signal recording onto the disk (1) is suspended. When the amount of signal data in the buffer RAM (10) increases to the predetermined amount, the signal recording onto the disk (1) is resumed. The number of occurrences of signal recording suspension and resumption due to the shortage of signals in the buffer RAM (10) is counted.

Abstract: A method and device for retrieving data in low-power is provided. More specifically, it relates to a method and device for minimizing power consumption while retrieving the continuous media data from a disk drive for the purpose of real-time playback. The data reproducing device reproduces multimedia data by a determined playback strategy after it computes power consumption values according to various playback strategies and retrieves data from a storage medium by a playback strategy having the least power consumption by means of comparing respective power consumption values.

Abstract: An optical disc apparatus includes a pause circuit for pausing data encoders upon receiving a pause signal so that a write operation may be paused without writing dummy data, thereby maintaining data succession. The optical disc apparatus also includes a circuit for accurately determining a write start location by referring to previously written data. A processor generates a pause signal when the amount of data in the optical drive apparatus data buffer is low, and removes the pause signal when additional data from a host is received. The processor may also automatically reduce the write speed of the optical disc apparatus upon a pause condition, thereby preventing the necessity for excessive pausing.

Abstract: An optical disc apparatus includes a pause circuit for pausing data encoders upon receiving a pause signal so that a write operation may be paused without writing dummy data, thereby maintaining data succession. The optical disc apparatus also includes a circuit for accurately determining a write start location by referring to previously written data. A processor generates a pause signal when the amount of data in the optical drive apparatus data buffer is low, and removes the pause signal when additional data from a host is received. The processor may also automatically reduce the write speed of the optical disc apparatus upon a pause condition, thereby preventing the necessity for excessive pausing.

Abstract: An optical disc apparatus includes a pause circuit for pausing data encoders upon receiving a pause signal so that a write operation may be paused without writing dummy data, thereby maintaining data succession. The optical disc apparatus also includes a circuit for accurately determining a write start location by referring to previously written data. A processor generates a pause signal when the amount of data in the optical drive apparatus data buffer is low, and removes the pause signal when additional data from a host is received. The processor may also automatically reduce the write speed of the optical disc apparatus upon a pause condition, thereby preventing the necessity for excessive pausing.

Abstract: When recording and reproduction are performed at the same time, if a system controller detects that an amount of data accumulated in a buffer memory exceeds a predetermined value, the system controller stops data reading from an optical disk 109 temporarily and records data accumulated in the buffer memory continuously to the optical disk. Then, an image is prevented from becoming abnormal when a reproduction position catches up to a recording position. Further, a system controller monitors a zone in an optical disk, to which recording is performed and controls a motor at an appropriate revolution number for the recording to the zone. Further, reproduction is performed by maintaining the revolution number. Then, even if the recording position and the reproduction position belong to different zones in a recording medium, a transition time from recording to reproduction is prevented from becoming long.

Abstract: A method for storing information, in particular audio signals, received via radio, in particular broadcast radio, the received information being written to a first memory, where the information stored in the first memory is overwritten by newly received information, preferably no later than when the memory capacity of the first memory is exceeded by the sum of the information stored in the first memory, and where in response to a record command all or part of the information present in the first memory is transferred into a second memory. As a result, even when playback of information which is of interest to the user has already begun, the latter can nevertheless record the entire information unit, for example the whole piece of music, part of which has already been played back, in its entirety right from the beginning.

Abstract: A method for managing buffers in an apparatus adapted for writing program portions onto and reading the program portions from a digital program disk comprises the steps of: filling a first buffer with encoded program portions at a first bit rate; filling a second buffer with the encoded program portions; supplying the encoded program portions from the second buffer for decoding; and, establishing an initial complementary fullness of the first and second buffers using an excess bit rate capability of the apparatus related to the first bit rate. The first bit rate is a constant bit rate slower than one-half of a maximum bit rate of the apparatus. An apparatus for implementing the method comprises a controller for recording the program portions onto alternate segments of the track, for initiating complementary operation of record and track buffers and for maintaining the complementary operation.

Abstract: An optical disk drive unit comprises, a target register for storing positional data on an optical disk for target data recorded in the optical disk, a comparator for comparing positional data on the optical disk for the read out data with the positional data stored in the target register, a delay circuit for delaying the data reproduced, and a buffer access circuit for carrying out control for starting transfer of data to a buffer RAM from output data of the delay circuit when it is detected that both positional data are coincident with each other by the comparator.

Abstract: When recording and reproduction are performed at the same time, if a system controller detects that an amount of data accumulated in a buffer memory exceeds a predetermined value, the system controller it stops data reading from an optical disk 109 temporarily and records data accumulated in the buffer memory continuously to the optical disk. Then, an image is prevented from becoming abnormal when a reproduction position catches up to a recording position. Further, a system controller monitors a zone in an optical disk, to which recording is performed and controls a motor at an appropriate revolution number for the recording to the zone. Further, reproduction is performed by maintaining the revolution number. Then, even if the recording position and the reproduction position belong to different zones in a recording medium, a transition time from recording to reproduction is prevented from becoming long.

Abstract: The present invention relates to a method and apparatus that can control data recording speed such as in an optical disk device. Based on a number of occurrences of recording failure such as buffer underrun, a method and apparatus can either reduce a data recording speed or dynamically changes the speed to a pre-defined speed while recording input data onto a writable optical disk. Therefore, even if a user-selected data recording speed is higher than the transfer rate of the external input data, the data recording speed can be controlled to efficiently complete a data recording operation or operate at a more desired data recording speed.

Abstract: The optical disk player is capable of correctly restarting to write data. Data protection means returns an optical pick-up from an interruption address to a synchronization starting address. The data protection means reads data from the synchronization starting address to the interruption address at a reading velocity equal to a former writing velocity. The data protection means restarts writing data from the interruption address if a phase of data read is synchronized with a phase of data to be written. The data protection means returns the optical pick-up to the synchronization starting address and reads data from there to the interruption address at a reading velocity slower than the former writing velocity so as to synchronize the phases if the synchronization is failed.

Abstract: An optical disc apparatus includes a pause circuit for pausing data encoders upon receiving a pause signal so that a write operation may be paused without writing dummy data, thereby maintaining data succession. The optical disc apparatus also includes a circuit for accurately determining a write start location by referring to previously written data. A processor generates a pause signal when the amount of data in the optical drive apparatus data buffer is low, and removes the pause signal when additional data from a host is received. The processor may also automatically reduce the write speed of the optical disc apparatus upon a pause condition, thereby preventing the necessity for excessive pausing.

Abstract: A method comprises utilizing an optical disk drive to manage defects on an optical disk. When a targeted block is defective, the method writes all data in an original packet to an alternative packet without temporarily storing the data in a memory of the optical disk drive, thereby saving memory resources.

Abstract: An optical disk recording apparatus has recording mechanisms which record data in an optical disk while a synchronizing code is inserted into the data at a certain interval, and a system controller which controls so as to resume recording at a position P short of several bytes to the synchronizing code when a data capacity in a data buffer is not more than a first predetermined capacity and then to resume the recording from the suspended position when the data capacity revives to not lower than a second predetermined capacity. The precise synchronizing code can be recorded in such a manner that the synchronizing code is not recorded at the time of recording resumption when recording operation is unstable, and the synchronizing code is recorded besides stabilization of the recording operation after data of several bytes is recorded.

Abstract: A method used in a CD-R/W drive for coordinating the writing and reading speeds of a CD-R/W drive is disclosed. With the aid of the method, the writing speed of the CD-R/W drive is able to be adjusted, and thus a more stable writing operation is obtained. In the method, if the time(s) that the buffer has been cleaned up is/are not larger than the predetermined value, the CD-R/W drive will write data to the CD-ROM at its highest speed. On the contrary, if the time(s) that the buffer has been cleaned up is/are larger than the predetermined value, the CD-R/W drive will slow down stepwise from the current speed to a lower speed. To accomplish the invention, the CD-R/W drive is either controlled by computer programs or by a programmably pre-written control chip that is installed in a control circuit inside the CD-R/W drive itself.

Abstract: A recording medium has first and second areas on which first and second information signals are recorded respectively. The first information signal has a size Ya. The second information signal has a size Yb. A head operates for reproducing the first and second information signals from the first and second areas of the recording medium and transmitting the reproduced first and second information signals on a time sharing basis and at a predetermined constant transfer rate Rp while moving between the first and second areas of the recording medium. A buffer memory operates for receiving the first and second information signals from the head at the predetermined constant transfer rate Rp, for temporarily storing the first and second information signals, and for outputting the first and second information signals at first and second transfer rates Ra and Rb respectively. The first and second transfer rates Ra and Rb are lower than the predetermined constant transfer rate Rp.

Abstract: An information recording apparatus that records information on a recording medium includes a write unit performing a write operation on the recording medium in which data continuity is maintained at an ending and an beginning point of writing information to the recording medium, a stop instruction unit instructing a temporary stop of the write operation during the write operation, a restart instruction unit instructing a restart of the write operation, and a write stop/restart control unit controlling the write unit to stop performing the write operation in response to an instruction of the temporary stop by said stop instruction unit and controlling the write unit to restart performing the write operation in response to an instruction of the restart by the restart instruction unit.

Abstract: The invention provides an optical disk recording and reproduction method which suppresses a drop of the throughput of an optical disk apparatus by retrying caused by a read error. A control section of an optical disk apparatus controls, if a read error occurs upon reading out of data from a first address of an optical disk by an optical head section, the optical head section to perform retrying of reading out from the first address. Each time retrying is performed, the control section records the number of times of retrying into a memory. Then, if reading out from the first address is performed successfully, then the control section reads out the number of times of retrying from the memory. If the number of times of retrying exceeds a prescribed number of times then the control section secures an alternative second address in place of the first address on the optical disk.

Abstract: A data recording speed control apparatus and method for recording a data on an optical recording medium are disclosed.

Abstract: When an optical disk apparatus 1 determines that it is timing of switching a recording layer for reading data from one recording layer to the other recording layer with respect to an optical disk 10, regardless of the amount of data stored in buffer memory 6 at this point in time, the optical disk apparatus 1 moves a pickup head 2 in a radial direction of the optical disk 10, and acquires a waveform of a tracking error signal, and also moves an objective lens in a direction going toward the optical disk 10, and acquires a waveform of a focus error signal, and readjusts tracking servo gain and focus servo gain based on these signal waveforms.

Abstract: During an operation to change the recording speed, an optical pickup (3) is retracted so as to play back a signal that has already been recording onto a disc D. A synchronization signal obtained from the signal that is played back by the optical pickup (3) and a recording reference signal are synchronized, and the recording operation is resumed from a recording interrupted position. The position where the optical pickup (3) is to be retracted is set on the basis of the time required to change the recording speed. Also, a rotational speed change operation for a spindle motor (1) for rotationally driving a disc D and the retract operation for the optical pickup (3) are performed concurrently.

Abstract: A method for adjusting the write speed of a data recording device and apparatus thereof. First, the recording media is written to at a write speed, during which the number of buffer underrun events is counted. Then, the write speed is adjusted according to the number of buffer underrun events until writing is finished.

Abstract: An apparatus records main information and sub information onto an information recording medium, which has a main recording area and a sub recording area. The apparatus is provided with an receiving device that receives the main information input from the external source; an accumulating device that accumulates the main information received by the receiving device; a recording device that records the main information and the sub information to the main recording area and the sub recording area, respectively; and a controller that determines whether or not an amount of the main information accumulated in the accumulating device is smaller than a predetermined amount, and that controls the recording device.

Abstract: An optical disk reproduction apparatus comprising a microcomputer (7) for resuming reading data from an optical disk (1) when buffering to a memory (6) is interrupted, a continuous data detector (55) for dividing first data buffered in the memory (6) before the buffering interruption and second data read out in accordance with an instruction from the microcomputer (7) into “n” groups, respectively, and detecting whether the first data and the second data are in coincidence for each group, and a buffering resumption request generating circuit (56) for instructing a timing of buffering resumption on the basis of a result of the continuous data detector (55).

Abstract: A method for controlling the speed of a spindle motor of an optical information reproducing apparatus is provided. The method determines whether a data quantity of a buffer memory is sequentially larger than a first predetermined quantity during a period of read operation. If yes, the spindle motor is decelerated to a predetermined speed. The method also determines whether the data quantity of the buffer memory is sequentially less than a second predetermined quantity during a period of read operation. If so, the spindle motor is accelerated to a predetermined speed. The method according to the invention can automatically tune the speed of the spindle motor to a suitable speed to eliminate the noise that normally accompanies faster operation without lowering the information reproducing efficiency of the optical information reproducing apparatus.

Abstract: An optical disc apparatus includes a pause circuit for pausing data encoders upon receiving a pause signal so that a write operation may be paused without writing dummy data, thereby maintaining data succession. The optical disc apparatus also includes a circuit for accurately determining a write start location by referring to previously written data. A processor generates a pause signal when the amount of data in the optical drive apparatus data buffer is low, and removes the pause signal when additional data from a host is received. The processor may also automatically reduce the write speed of the optical disc apparatus upon a pause condition, thereby preventing the necessity for excessive pausing.