Abstract: In one embodiment, one or more control units may store a position tracker associated with a first window of memory blocks and allow a first processing unit to write data within the first window. The control units may receive, from a second processing unit, a request for reading data with a memory-reading address, compare the memory-reading address to a first starting address of the first window, and prevent the second processing unit from reading the data when the memory-reading address is greater than or equal to the first starting address of the first window. The control units may store, when the data writing process is complete, an updated position tracker of a second window of memory blocks and allow the second processing unit to read the data based on a determination that the memory-reading address is less than a second starting address of the second window.

Abstract: A flash memory controller includes a read-only memory, a microprocessor and a buffer memory, wherein the buffer memory includes a data temporary storage area having continuous addresses. When the flash memory controller receives data from a host device, the microprocessor determines whether there is enough space between the last stored data in the data temporary storage area and an end address of the data temporary storage area to store the entire content of the data. If there is not enough space between the last stored data in the data temporary storage area and the end address to store the entire content of the data, the microprocessor directly stores the data from a starting address in the data temporary storage area, without writing any part of the data to the area before the end address of the data temporary storage area.

Abstract: According to one embodiment, a monitoring unit of a magnetic disk device monitors a supply voltage supplied to a plurality of actuators by a first threshold value at which power supply by back electromotive force of a motor is started, and a second threshold value that is larger than the first threshold value. In a case where the supply voltage is lower than or equal to the second threshold value and is higher than the first threshold value, a controller interrupts execution of processing of reading/writing data to a magnetic disk in at least one of the actuators according to a predetermined condition based on execution status of the processing in the actuators.

Abstract: A network device includes a transfer buffer having a plurality of memory banks, and a transfer buffer controller configured to perform a first number of write operations to write processed packets into a memory bank of the transfer buffer, monitor occupancy of the transfer buffer, and when occupancy of the transfer buffer is at least equal to a threshold, perform a predetermined number of read operations during each memory cycle, and when occupancy of the transfer buffer is less than the threshold, perform a second number of read operations, greater than the predetermined number, during each memory cycle. The device concurrently performs multiple read operations and multiple write operations in a single cycle using a plurality of ports. The buffer controller distributes data among the memory banks by allocating write addresses to keep memory occupancy substantially uniform among the memory banks, thereby freeing ports to allow performance of read operations.

Abstract: A computer determines an intrinsic read speed and an intrinsic write speed associated with a first disk and a second disk. The computer receives a request to read a portion of data, wherein the portion of data is stored redundantly on both the first and second disk. The computer identifies a first latency associated with reading the portion of data from the first disk, where the first latency is based on at least the intrinsic read speed and the intrinsic write speed associated with the first disk. The computer identifies a second latency associated with reading the portion of data form the second disk, wherein the second latency is based on at least the intrinsic read speed and the intrinsic write speed associated with the second disk. The computer determines that the first latency exceeds the second latency. The computer selects the second disk to read the portion of data.

Abstract: A digital camera includes an image sensor unit, a display that displays an image photographed by the image sensor unit, and a photographing guide generating unit that displays a photographing guide on the display when the image sensor unit obtains a stereo image or a panoramic image. The photographing guide generating unit displays, on the display as the photographing guide, an aiming mark that displays a fixed point positioned substantially at the center of the display and a guide mark that is a fixed point in the image photographed by the image sensor unit and has a length necessary for the stereo image or the panoramic image in a moving direction of the digital camera on a screen. Then, it is possible to provide an imaging apparatus capable of stably moving the imaging apparatus upon photographing a panoramic picture.

Abstract: A processing unit performs a method including controlling a reading-out of data from a first storage medium at a predetermined read-out data rate to produce inputted data, and controlling a compression of the inputted data to produce first compressed data of a first compressed format. The method includes controlling a storage of the first compressed data in a second storage medium at a faster writing data rate than the predetermined read-out data rate, controlling a reading-out of second compressed data of a second compressed format from the second storage medium, and controlling a decompression of the second compressed data to produce decompressed data. The method also includes controlling simultaneously the storage of the first compressed data in the second storage medium, the reading-out of the second compressed data from the second storage medium, and audibly reproducing the decompressed data. The first compressed format is different from the second compressed format.

Abstract: Aspects of the disclosure provide a method. The method includes receiving regional quality information of a region on a storage medium, and adjusting a fill level threshold of a buffer based on the regional quality information. The fill level threshold is used to trigger filling the buffer with data read from the region.

Abstract: Aspects of the disclosure provide a method. The method includes receiving regional quality information of a region on a storage medium, and adjusting a fill level threshold of a buffer based on the regional quality information. The fill level threshold is used to trigger filling the buffer with data read from the region.

Abstract: An information reproduction device sets, from among a plurality of estimated rotation speeds previously estimated, a set rotation speed in accordance with request-specification information specifying a piece of data requested by an external device and a specified rotation speed specified by the external device for a disc-shaped storage medium storing data, rotates the storage medium at the set rotation speed, reads out data from the storage medium at a readout speed that is determined by the set rotation speed of the storage medium, stores the data in a data storage section, and supplies, from among the stored data, the piece of data corresponding to the request-specification information to the external device.

Abstract: A testing device for testing read performance of a disc drive, includes a receiving unit, a cache and a detecting unit. The receiving unit receives images obtained by the disc drive. The cache temporarily stores the received images. The detecting unit detects the number of the images in the cache and generates a detecting signal to indicate that there is an abnormity if the number of the images in the cache is less than a preset value. A test method for testing read performance of disc drive is also provided.

Abstract: Example embodiments provide various techniques for playing data from an optical media drive. The optical media drive may detect certain media access information for use in accessing optical media. This media access information is stored a non-volatile memory. The optical media drive then retrieves the media access information from the non-volatile memory once the optical media drive is reactivated after deactivation. The optical media drive may then read from the optical media using the provided media access information.

Abstract: A processing unit performs a method including controlling a reading-out of data from a first storage medium at a predetermined read-out data rate to produce inputted data, and controlling a compression of the inputted data to produce first compressed data of a first compressed format. The method includes controlling a storage of the first compressed data in a second storage medium at a faster writing data rate than the predetermined read-out data rate, controlling a reading-out of second compressed data of a second compressed format from the second storage medium, and controlling a decompression of the second compressed data to produce decompressed data. The method also includes controlling simultaneously the storage of the first compressed data in the second storage medium, the reading-out of the second compressed data from the second storage medium, and audibly reproducing the decompressed data. The first compressed format is different from the second compressed format.

Abstract: Provided is an orbiting memory capable of suppressing residual deviation even when a phase difference is caused between a signal to be compensated and information stored in a memory to be fed back and a disc device using the orbiting memory. The disc device includes: an adder to which a signal (s10) to be compensated and having a cyclic frequency component such as a control system error signal is inputted; and a feed back signal system for successively updating and storing an output signal of the adder for each cycle in a memory and inputting one-cycle information stored in the memory to the adder.

Abstract: A reproducing system reproduces data recorded on an optical record carrier. The system includes a light source driver unit that modulates and controls a light output by a light source, such as a laser, in order to read data from an optical record carrier. The system is configured to operate in two modes: a reading mode and a light source lifetime extension mode. During the reading mode, the light source generates a continuous light output while data is read from the optical record carrier. During the light source lifetime extension mode, the light source generates a pulsed light output which may provide continued tracking and focus of the light on the optical record carrier, even when no data is being read from it.

Abstract: A buffer control system for generating a buffered signal having reduced buffer delay time between playback of tracks includes a controller module for providing an end target and for selection of a servo data signal corresponding to a desired track; a compare circuit coupled to the servo data signal for comparing a timestamp of the servo data signal to the end target, and asserting an end match signal when the timestamp of the servo data signal matches the end target; and a data buffering unit for storing the servo data signal as stored data to fill a capacity of an internal memory, and streaming out the buffered signal from the stored data in the internal memory when the capacity has reached a predetermined level; wherein the controller module is for updating selection of the servo data signal according to a next desired track upon assertion of the end match signal.

Abstract: An information-processing apparatus includes a processing unit that compresses inputted data to produce compressed data of a first compressed format. The information-processing apparatus also includes a storage unit that stores the compressed data in a storage medium. The processing unit decompresses data, stored in the storage medium, of a second compressed format to produce decompressed data. Further, the processing unit controls the storage unit to store the compressed data of the first compressed format in the storage medium while the processing unit simultaneously decompresses the data, stored in the storage medium, of the second compressed format and reproduces the decompressed data. The first compressed format is different than the second compressed format.

Abstract: An information recording apparatus such as an optical disc that can avoid an unrecordable condition between a power-on operation and an available state for recording thereby to solve a problem that an image taking chance is missed in a recording step, wherein its constitution is such that: receiving a command to turn on the apparatus after switching, a system controller drives a power-supply circuit to activate a drive controller and a memory controller; if the optical disc is not replaced while in power-off operation by a sub-battery, the system controller issues a request for high-speed activation, based on information stored in an EEPROM, to the drive controller, and drives plural drive control units one after another thereby to establish an activation period confirmedly, allowing the memory controller to accept a request for a recording start from the system controller without waiting for a report of activation completion to be issued by the drive controller.

Abstract: A disk drive and an information processing system optimizes the number of rotations of a disk. Data read from a disk and previously-read cache data are temporarily stored in buffer memory. When a total amount of cache data achieved during a given period of time T1 or an average amount of the same is equal to or less than a threshold value X1, a system controller controls the number of rotations in an increasing manner, thereby optimizing the number of rotations. When a total amount of cache data achieved during a given period of time T2 (T1<T2) or an average amount of the same is equal to or greater than a threshold value X2, a system controller controls the number of rotations in an decreasing manner, thereby optimizing the number of rotations.

Abstract: Example embodiments provide various techniques for playing data from an optical media drive. The optical media drive may detect certain media access information for use in accessing optical media. This media access information is stored in a memory that is configured to retain the media access information after the optical media drive is deactivated. The optical media drive reads the data from an optical media and this data is transferred to a buffer until, with reference to some threshold parameter, the optical media drive is deactivated. The optical media drive may be reactivated in reference to another threshold parameter and the media access information is thereafter retrieved from the memory. The optical media drive may then read from the optical media using the provided media access information.

Abstract: A recording method, particularly suitable for use in a digital video-camera, is described according to which a digital signal (10), deriving from the encoding of an audio-video signal is temporarily stored in a buffer (11) and from there recorded in a dual layer DVD (12) in successive recording intervals (22) or packets. The start/stop of a recording interval is normally controlled according to the level (15) of filling of the buffer. The digital signal is partitioned in portions that need to be entirely recorded on one single layer, and this triggers the need for a layer jump independently from the level of filling of the buffer. In order to avoid starting a layer jump with the buffer already partly filled, and therefore having a short non-recording interval (23) when time is mostly needed for calibrations, it is proposed to adjust the resolution in the encoding of the audio-video signal so as to have the buffer close to empty when the layer jump occurs.

Abstract: An object of this invention is to provide an optical disc controller and an optical disc drive system which reduce the proceeding time for supplementing data that is deficient at the time of writing to the optical disc. The present invention relates to an optical disc controller and a optical disc drive system. An optical disc controller includes an interface circuit, a buffer, a memory manager, an ECC circuit, a modulation circuit, and an operation processor. The memory manager has a control register part, a copy transfer controller, and a buffer controller. The control register part further includes a copy sector number setting register for taking out and holding information of plural sector numbers of deficient data from a control signal of the operation processor. The copy transfer controller successively conducts copy transfer process for plural sector numbers based on the sector number information.

Abstract: The present invention provides a control method of an optical disc drive, including the steps of: (a) entering a writing state; (b) checking if a reading command for requesting recorded data is received, wherein when the reading command is not received, then continuing a writing process, and when the reading command is received, then going to step (c); (c) interrupting the writing process; (d) switching to a reading state; (e) reading the recorded data according to the reading command; and (f) switching to the writing state.

Abstract: A recording device is equipped with an input unit for inputting information data, a memory for storing the input information data, a writing unit for reading the information data stored in the memory, and writing the information data read from the memory on a disk-like recording medium having plural recording layers, and a control unit for changing a writing procedure by the writing unit, in accordance with a difference between a writing position on the disk-like recording medium by the writing unit and a position on the disk-like recording medium where the recording layer is to be transitioned, coming to a predetermined value.

Abstract: A recording medium includes a plurality of signal recording layers. A head reproduces two information signals from respective places in the recording medium on a time sharing basis. The reproduced signals are stored in a buffer memory before being outputted therefrom at first and second transfer rates respectively. The reproduced signals are transmitted from the head to the buffer memory on a time sharing basis and at a third transfer rate higher than the first and second transfer rates. Information amounts of the respective reproduced signals continuously transmitted from the head to the buffer memory are decided on the basis of a given relation among parameters including intra-layer seek times and inter-layer seek times related to the head, and the first, second, and third transfer rates.

Abstract: A playback device for playback of a media stream stored on a storage medium, the device includes a controller for controlling the reading, buffering and playback of the media stream. During playback, a buffer is filled by a reader and emptied by a playback unit. At each buffer, filling a buffer refilling time, i.e., the moment when the buffer will be empty and thus has to be refilled, is calculated. After each buffer filling, the storage medium can change to standby mode till buffer refilling is to occur. Thus, power consumption by the storage medium is minimized. The buffer refilling time depends on the total consumption time and the buffer filling period. The total consumption time is determined depending on playback mode control information. The buffer filling period is calculated depending on information about the retrieval of the media stream or an estimation of the buffer filling period is made.

Abstract: A device seamlessly records real-time information on a record carrier in a track on a recording layer via a beam of radiation. The device has a real-time information buffer and an interface for transfer of real-time information and commands between a source and the recording means. While recording the real-time information, the device detects (42) an inability to write information on the record carrier for a period exceeding (43) a local realtime information buffering capacity of the real-time information buffer. If so, a stop command is sent (44) to the source for temporarily interrupting the transfer of real-time information. After the device detects that said inability has ended (45), a resume command is sent (46) to the source for resuming the transfer of real-time information. Hence seamless recording is provided without a need for a large buffer, in particular in the event of a layer jump when recording on a multilayer optical disc.

Abstract: A standard reproduction model for ensuring real time reproducing on a disk-shaped information recording medium, includes a pickup (102) that reads the real time data from the information recording medium, a buffer memory (103) that temporarily stores the real time data read by the pickup, and a decoding module (104) that reads the real time data from the buffer memory (103) and processes the read real time data. An access time Tacc of the standard reproduction model is expressed by the following formula, Tacc=A·dN+Trev+B where dN is a difference in rotational speed of the disk-shaped information recording medium, Trev is a rotation waiting time at a target access position, A and B are constants.

Abstract: A recording apparatus includes a write unit to write information data read from a memory by irradiating a disk medium with a beam in accordance with the information data, and a control unit to, upon the amount of information data stored in the memory reaching a threshold, instruct the write unit to start writing of the information data. In response to the write instruction, the write unit reads the information data stored in the memory and writes the read information data onto the disk medium while it is rotating. Upon the amount of information data in the memory decreasing to a predetermined value, the write unit stops reading and writing of the information data from the memory and onto the disk medium. The control unit sets a value of the threshold in accordance with the number of times the write unit has performed writing of the information data.

Abstract: A method for playing a fast rolling music disc is provided. A music disc is read at an accelerated rate and played at a standard rate by discretely buffering data blocks into a ping pong buffer. Playing of a first data block stored in the first buffer, and buffering of a second data block into the second buffer are concurrently executed. When the playing of the first data block is concluded, the playing order of the first buffer and the second buffer are interchanged, and the concurrent playing and buffering step is repeated. Such that the second data block is played in the second buffer while a third data block is buffered into the first buffer. Discreteness between the second data block and the first data block is dependent on a skipping ratio, and the skipping ratio is dependent on the accelerated rate.

Abstract: An optical disk writing apparatus maintaining appropriate write power in real time with a simple configuration includes a buffer for recording data, a binarization circuit supplying data to the buffer, an LD writing data recorded in the buffer onto a DVD disk, a detector reading out from the DVD disk a signal representing data written by the LD at an arbitrary time during a period starting from when the amount of data recorded in the buffer and not yet written onto the DVD disk becomes zero until the amount of data reaches a predetermined number of ECC blocks, and a servo processor correcting an error in the data read out by the detector for every data amount susceptible to error correction at one time, evaluating the writing of the LD using the corrected signal, and controlling the energy density to be employed in writing data onto the DVD disk by the LD according to its own evaluation.

Abstract: Blu-Ray reading and writing methods are provided. In a reading procedure, a first plurality of recording frames are sequentially read from a Blu-Ray disc and stored in a memory array along a first direction to assemble a first LDC block comprising a plurality of data lines arranged along a second direction. A second plurality of recording frames are simultaneously read and stored in the memory array along the second direction to assemble a second LDC block comprising a plurality of data lines arranged along the first direction while the data lines in the first LDC block are sequentially decoded and output.

Abstract: Disclosed is a playback device capable of audio playback with little or no interruption. Yet, there is no need of increasing the memory capacity of the playback device and sacrificing the usability of the playback device. The playback device stores, to its internal memory, identification information of audio data stored on a recording medium such as an optical disc, and specifying information specifying the storage location of the identification information. The playback device sequentially stores the audio data to a remaining area of the memory. The audio data stored in the memory is supplied for playback.

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: Disclosed herein is an information recording/reproducing apparatus that includes a first and a second recording/reproducing modules, a buffer memory to store information temporally, and a control module that switches between a first mode and a second mode when the information is dubbed from the first recording/reproducing module to the second recording/reproducing module. In the first mode, information in the first recording/reproducing module is reproduced and stored in the buffer memory. In the second mode, the information stored in the buffer memory is recorded in the second recording/reproducing module. The apparatus further includes a temperature detecting module. Depending on the temperature detected by this module, the apparatus changes the movement of the second recording/reproducing module in the first mode and the movement of the first recording/reproducing module in the second mode.

Abstract: A data recording method for an optical disk drive is implemented by the following steps. First, one or more data blocks are encoded and recorded sequentially, and it detects if a buffer under run occurs. If a buffer under run occurs, the recording does not stop immediately until at least the main data of the data block being currently recorded have been recorded completely. Afterwards, it restarts to encode and record from the data block next to the data block where the recording stops. Moreover, the recording also can stops if a servo error is detected, and the data restart to encode and record from the data block where the recording stops or at least one data block preceding the data block where the recording stops.

Abstract: In a conventional method for preventing a collision between a lens and an optical disc which uses a control system similar to the servo control of the optical disc, it is feared that, when there is no need to apply the servo, the collision prevention method may not perform its function satisfactorily. In an optical disc device that operates with a part of its functions suspended for reduced power consumption, the conventional method is not enough to avoid the collision between the lens and the optical disc. By arranging the lens/disc collision prevention mechanism independently operable, it is possible to prevent the collision between the lens and the disc even during the operation with limited functions.

Abstract: A coder codes an information signal. A rate controller controls a coding rate of the coder in accordance with complexity of the information signal. The rate controller controls a coding amount per unit time in the coding process so that an average value of the coding amount can be approximate to an average rate. The coded data is temporarily memorized in a temporary memory unit and processed by an information processing unit such as a recorder and a transmitter. The information processing unit measures an information processing rate in processing the information. The rate controller adjusts the average rate so that the average rate is lower than the information processing rate measured by the information processing unit, or the rate controller compares a threshold value of a used amount of the temporary memory unit which is previously set and an actually used amount of the temporary memory unit and reduces the average rate when the used amount exceeds the threshold value.

Abstract: When “buffer under run” (BUR) occurs during recording of a visible image on an optical disk, recording operation is interrupted. As in the case of type A, when BUR1 occurs after data have been transferred through an integral multiple of one revolution, data are recorded continuously from a reference angle position without host device discarding data. As in the case of type B, when BUR2 occurs after data have been transferred in a value which is other than the integral multiple of one revolution, data corresponding to a duration from the position where BUR occurs to the start of the next revolution are discarded, data are continuously recorded from the reference angle position. Thereby, rendering can be spliced in a visually-smooth manner.

Abstract: An optical disk apparatus which records data on the basis of a predetermined minimum amount of recording data. Recording data supplied from an external device is stored in a buffer memory and then encoded and recorded on an optical disk. The data is recorded in units of one ECC block (sixteen sectors). When the buffer memory has a free space corresponding to data amount of less than one ECC block, a system controller supplies a request for data in a data amount of the free space to the host device to store data corresponding to one ECC block in the buffer memory, as a result of which data filling by means of access to the optical disk is prevented.

Abstract: An information recording and reproducing apparatus (S) is provided with: a first reproducing device (11) for reproducing audio information from a first information record medium (DK), in which the audio information is recorded; a recording device (28) for recording the reproduced audio information into a second information record medium (HD); a second reproducing device (28) for reproducing the audio information recorded in the second information record medium; and a controlling device (6) for setting a recording speed when recording the audio information into the second information record medium and a reproducing speed when reproducing the audio information from the second information record medium such that the recording speed is equal to or higher than the reproducing speed, and controlling the second reproducing device and the recording device so as to perform reproducing the recorded audio information from the second information record medium at the set reproducing speed in parallel to recording the audi

Abstract: An information recording apparatus is provided with: a recording device for recording information onto an information recording medium; a detrack detecting device for detecting occurrence of detrack during the recording of the information; and a controlling device for controlling the recording device to return to a location where the detrack has occurred and restart the recording if the occurrence of the detrack is detected.

Abstract: Provided is an information recording apparatus including: a memory for storing image pickup data; a recording circuit for intermittently recording the image pickup data stored in the memory on a disc-like medium from the memory; a setting circuit for setting an ejection mode of the disc-like medium; and a control circuit for ejecting the disc-like medium without recording the image pickup data stored in the memory on the disc-like medium when a first ejection mode is set by the setting circuit. The apparatus enables to immediately remove a disk-like medium.

Abstract: A control circuit and a control method of controlling a rotation frequency of a spindle in an optical disc drive, the control circuit comprising: a spindle controller, electrically coupled to the spindle, for driving the spindle to rotate an optical disc according to a rotation control signal; a detector, electrically coupled to the spindle controller, for detecting the rotation frequency and for generating detecting signals; a frequency-adjusting module, electrically coupled to the detector, for adjusting at least one of the detecting signals to reduce a rotation frequency difference between detecting signals; a signal selector, electrically coupled to the frequency-adjusting module, for receiving output signals generated from the frequency-adjusting module and then outputting the rotation control signal.

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: An optical disk unit includes the following: a storage part temporarily storing data to be written to an optical disk; a processing part processing the data; an encoder part modulating and outputting the processed data; a writing control part controlling writing of the data to the optical disk; and a writing command part detecting an occurrence of a state of suspension of supply of the data to the storage part and providing an operation command to the writing control part in accordance with the detection result. In the case of suspending the writing of the data to the optical disk, the writing control part causes the processing and encoder parts to stop accessing the storage part by setting the processing and encoder parts in a wait state after the processing and encoder parts access the storage part, and causes the storing of the data in the storage part to be stopped.

Abstract: High-rate writing of data recorded on a CD into a hard disk drive (HDD) is performed while reproducing data read out of the CD at the standard bit rate prescribed for the CD. PCM data corresponding to a playback time of 10 seconds, for example, is read out of a CD and stored in a memory. The data is read out of the memory at appropriate timing and outputted after being converted into an analog audio signal by a D/A converter. In parallel, data for writing is read out of the CD in succession to reading of the data for playback and stored in the memory. The data read out of the memory is coded and compressed by an encoder and then stored in the memory. The compressed data is read out of the memory in units of a certain amount suitable for writing in an HDD and then written in the HDD.

Abstract: In order to perform simultaneous recording of a plurality of pieces of real time data, a large capacity of buffer memories were required. In addition, it was difficult to reproduce data which was recorded by a different apparatus. The present invention has an objective of providing an information recording medium, a simultaneous recording method, and an information recording and reproduction apparatus which guarantee simultaneous recording. The simultaneous recording is guaranteed by reproducing data in each of areas having at least a minimum size fulfilling the simultaneous recording condition which allows for the number of access operations which is twice the number of pieces of real time data to be recorded, and when the data amount in the buffer is empty, switching the current recording operation to another recording operation to continue recording.

Abstract: A standard reproduction model for ensuring real time reproducing on a disk-shaped information recording medium, includes a pickup (102) that reads the real time data from the information recording medium, a buffer memory (103) that temporarily stores the real time data read by the pickup, and a decoding module (104) that reads the real time data from the buffer memory (103) and processes the read real time data. An access time Tacc of the standard reproduction model is expressed by the following formula, Tacc=A·dN+Trev+B where dN is a difference in rotational speed of the disk-shaped information recording medium, Trev is a rotation waiting time at a target access position, A and B are constants.

Abstract: A data writing control device enables quickly writing data to optical discs. A reading process unit 62a, 62b reads data in predetermined read units from a storage device (hard disk drive 14) that has a head and stores the data. A storage unit (buffers 63a and 63b) has a storage area for storing the read units of data read by the reading process unit 62a, 62b. A writing process unit 64a, 64b acquires data stored in the storage area of the storage unit in write units, which are smaller than the read units, and supplies the acquired write units of data to an optical disc drive which is connected as a peripheral device.