JP2005174372A - Data recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data recording apparatus which can stably write data to a recording medium. <P>SOLUTION: The data recording apparatus is provided with an image memory 9 for storing inputted data therein, a recording medium (HDD) 11 having a storage capacity greater than that of the image memory 9, an ATA controller 10 for transferring data which are stored in the image memory 9 to the HDD 11 and storing the data thereon, a camera shake detection circuit 5 for detecting vibration applied to the HDD 11, an integration circuit 8 for counting a vibration duration time based on the vibration detection by the camera shake detection circuit 5, and an image transform circuit 7 for compressing data stored in the image memory 9 with compressibility based on the vibration duration time counted by the integration circuit 8. In accordance with the vibration detection by the camera shake detection circuit 5, data transfer from the image memory 9 to the HDD 11 is prohibited by the ATA controller 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a data recording apparatus comprising a memory for storing input data, a recording medium having a larger storage capacity than the memory, and transfer control means for transferring the data stored in the memory to the recording medium for storage. About.

2. Description of the Related Art Conventionally, there is a digital video camera that records captured video data on a recording medium as a data recording apparatus that stores input data in a memory and then transfers the data to a recording medium for recording. In recent years, an increasing number of digital video cameras perform digital signal processing of video data and record it on a recording medium such as a hard disk drive (hereinafter referred to as a hard disk) or an optical disk. In such a digital video camera, the captured video data is often converted into an MPEG (Motion Pictures Expert Group) format or the like to compress the data amount (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-322221

  When using a digital video camera, vibrations due to camera shake may occur because the device is supported by hand. When image data is recorded on the hard disk, if vibration occurs due to camera shake or the like, there is a problem in that normal recording cannot be performed due to the position of the head or pickup inside the hard disk being displaced.

  As a method of avoiding this problem, a vibration sensor is provided in the hard disk, and writing of video data is stopped on the hard disk side while vibration is detected. For example, when a vibration sensor is provided near the disk and the vibration sensor detects vibration, the current supplied to the head is stopped to prevent data from being erroneously written to the sector.

  However, the vibration sensor inside the hard disk is used for processing inside the hard disk, and generally cannot be used outside the hard disk. Therefore, when data writing is stopped on the hard disk side due to vibration detection, it cannot be immediately detected from the outside of the hard disk that writing is stopped internally. For example, when write stop processing is performed on the hard disk side that detects vibration, post-processing is performed such as writing again inside the hard disk or notifying the transfer control device outside the hard disk of a write error. In the meantime, the transfer control device cannot transfer data to the hard disk normally.

  As described above, when vibration occurs due to camera shake or the like, video data cannot be normally transferred and recorded on the hard disk during the hard disk writing stop time and post-processing time due to vibration. There is a problem that a lack occurs.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a data recording apparatus capable of stably writing data to a recording medium even when vibration occurs. And

  Another object of the present invention is to provide a data recording apparatus that can reduce power consumption of the recording medium and prevent damage to the recording medium due to vibration.

  In addition, the present invention provides a data recording apparatus capable of quickly transferring data stored in a memory to secure a free space when the prohibition of data transfer is canceled and to prepare for the next occurrence of vibration. For other purposes.

  Another object of the present invention is to provide a data recording apparatus capable of performing data transfer at high speed when the prohibition of data transfer is released.

  Another object of the present invention is to provide a data recording apparatus that can prevent data loss by suppressing memory overflow when vibration continues for a long time.

  A data recording apparatus according to the present invention includes a memory for storing input data, a recording medium having a larger storage capacity than the memory, and the data stored in the memory to the recording medium at a time interval longer than the data input interval. A data recording apparatus comprising a transfer control means for transferring and storing the data comprises a vibration detection means for detecting vibration applied to the recording medium, wherein the transfer control means detects vibration detected by the vibration detection means when performing data transfer. Data transfer is prohibited when the level is equal to or higher than a predetermined level, and then data transfer is performed when vibration becomes less than the predetermined level.

  In the data recording apparatus according to the present invention, the transfer control means determines a data size to be transferred from the memory to the recording medium, performs data transfer in the determined data size unit, and the vibration becomes less than the predetermined level. When performing the data transfer, if the total data size of the data stored in the memory exceeds the data size, the data transfer is performed continuously in a plurality of times.

  In the data recording apparatus according to the present invention, the transfer control means determines a data size to be transferred from the memory to the recording medium, performs data transfer in the determined data size unit, and the vibration becomes less than the predetermined level. When performing the data transfer, if the total data size of the data stored in the memory exceeds the data size, the data size is changed to the total data size or more to perform the data transfer It is characterized by.

  The data recording apparatus according to the present invention comprises a time measuring means for measuring a vibration duration based on vibration detection by the vibration detecting means, and data stored in the memory at a compression rate based on the vibration duration time measured by the time measuring means. Compression means for compressing.

  A data recording apparatus according to the present invention includes a memory for storing input data, a recording medium having a larger storage capacity than the memory, and transfer control means for transferring the data stored in the memory to the recording medium for storage. In the data recording apparatus comprising: a vibration detecting means for detecting vibration applied to the recording medium; a time measuring means for measuring a vibration duration based on vibration detection of the vibration detecting means; and a vibration continuation time measured by the time measuring means. Compression means for compressing data stored in the memory at a compression rate based on the data, and the transfer control means is configured to prohibit data transfer from the memory to the recording medium in response to detection of vibration by the vibration detection means. It is characterized by being.

  In the present invention, the vibration applied to the recording medium is detected by the vibration detecting means. The transfer control means prohibits the data transfer when the vibration detected by the vibration detecting means when attempting to transfer the data is above a predetermined level, and thereafter transfers the data when the vibration falls below the predetermined level. I do. For example, when the recording medium is provided with a function of stopping data writing when vibration exceeds the predetermined level, recording is performed from the memory by the transfer control means during the period when the recording medium stops data writing due to vibration. Since data transfer to the medium is prohibited, the occurrence of a write error can be prevented.

  Data transfer from the memory to the recording medium can be performed in a unit data size with a time interval, transferred at a predetermined time interval, or always (without a time interval). Data transfer with unit data size or at a predetermined time interval can reduce the power consumption of the recording medium rather than always performing transfer, and recording by vibration such as by retracting the head during periods when transfer is not being performed. The medium can be prevented from being damaged.

  In the present invention, the transfer control means determines the unit data size to be transferred from the memory to the recording medium, and transfers the data together with a time interval below the determined unit data size. When data transfer is performed when vibration is less than the predetermined level, if the total data size of the data stored in the memory is larger than the unit data size, the transfer control means divides the data continuously into a plurality of times. Do. When the prohibition of data transfer due to vibration continues for a long time, the total data size of the data stored in the memory increases and may exceed the unit data size, but the data transfer is performed continuously in multiple times As a result, free memory space can be secured quickly.

  In the present invention, the transfer control means determines the unit data size to be transferred from the memory to the recording medium, and transfers the data together with a time interval below the determined unit data size. When the data is transferred when the vibration is less than the predetermined level, if the total data size of the data stored in the memory is larger than the unit data size, the transfer control means sets the unit data size to be equal to or larger than the total data size. Change and transfer data. When the prohibition of data transfer due to vibration continues for a long time, the total data size of the data stored in the memory increases and may exceed the unit data size, but the unit data size is changed to the total data size or more By transferring data, the free memory capacity can be quickly secured.

  In the present invention, the vibration continuation time is measured by the time measuring means based on the vibration detection by the vibration detecting means. Further, the data stored in the memory is compressed by the compression means at a compression rate based on the measured vibration duration time. For example, if prohibition of data transfer due to vibration continues for a long time, the total data size of data stored in the memory may increase, and the free space may become insufficient. In such a case, when the vibration continuation time reaches a predetermined time, the compression means increases the data compression rate to reduce the data size after compression per unit time, thereby reducing the decrease rate of the free space of the memory. Let

  According to the present invention, when the vibration is above a predetermined level, the data transfer from the memory to the recording medium is prohibited, so that the recording medium such as a hard disk stops writing in response to the internal vibration detection. Data transfer can be stopped to prevent occurrence of a writing error and data loss when vibration occurs. Even when vibration occurs in the middle, data can be stably written to the recording medium.

  According to the present invention, the power consumption of the recording medium can be reduced by not always performing the data transfer, and the recording medium can be prevented from being damaged due to vibration by retracting the head during a period when the transfer is not performed. .

  According to the present invention, when the transfer prohibition is canceled, if the total data size of the data stored in the memory is larger than the unit data size of the transfer, the data transfer is performed continuously in a plurality of times. The data stored in the memory can be quickly transferred to secure free space and be prepared for the next occurrence of vibration.

  According to the present invention, when the transfer prohibition is canceled, if the total data size of the data stored in the memory is larger than the unit data size of the transfer, by performing the data transfer by increasing the unit data size, The data stored in the memory can be quickly transferred to secure a free space and be prepared for the next occurrence of vibration. Further, when the transfer unit data size is increased, since a transfer command or the like only needs to be performed once, data transfer can be performed at a higher speed than dividing into multiple times.

  According to the present invention, by compressing data at a compression rate based on the vibration duration time, the data compression rate when vibration continues for a long time is increased, the data size after compression per unit time is reduced, and the memory The rate of decrease in free space can be reduced. Data overflow can be prevented by suppressing memory overflow.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
FIG. 1 is a block diagram showing a configuration example of a digital video camera (data recording apparatus) according to the present invention. In FIG. 1, 1 is a lens, 2 is an iris, 3 is an image sensor, 4 is a camera signal processing circuit, 5 is a camera shake detection circuit, 6 is a camera shake correction circuit, 7 is an image conversion circuit, 8 is an integration circuit, and 9 is an image memory. Reference numeral 10 denotes an ATA (Advanced Technology Attachment) controller, and 11 denotes a hard disk drive (hereinafter referred to as HDD).

  The optical image that has passed through the lens 1 is adjusted in light quantity by an iris 2 and converted into an electrical signal by an imaging device 3 such as a CCD (Charge Coupled Device). The converted electrical signal is sent to the camera signal processing circuit 4 and subjected to processing such as matrix conversion and gamma conversion to generate digital video data (hereinafter referred to as video data). The generated video data is sent to the camera shake detection circuit 5 and the camera shake correction circuit 6.

  The camera shake detection circuit (vibration detecting means) 5 detects camera shake based on continuously input video data. For example, camera shake can be detected by comparing the previous and next frames with respect to image frames of a predetermined time interval constituting the video data and detecting the amount of motion (vector amount) between the previous and next frames. Further, vibrations applied to the HDD (recording medium) 11 can be detected by detecting camera shake (motion amount). The detected motion amount is sent to the camera shake correction circuit 6, the integration circuit 8, and the ATA controller 10.

  The camera shake correction circuit 6 corrects the video data according to the detected amount of motion, reduces the influence of camera shake, and improves the image quality. The corrected video data is sent to the image conversion circuit 7. Further, the integration circuit (time measuring means) 8 compares a preset reference amount (predetermined level) with the detected amount of motion (vibration amount), and the time during which the amount of motion is equal to or greater than the reference amount ( (Vibration duration) is counted. Further, the integrating circuit 8 compares the vibration duration time with a predetermined time set in advance, and sends a signal to the image conversion circuit 7 when the vibration duration time reaches the predetermined time.

  The image data corrected for camera shake is converted into an image format (moving image format) such as an MPEG format by an image conversion circuit (compression unit) 7. The video data converted into the MPEG format is compressed, and the data size is smaller than the video data before conversion. For moving picture compression such as MPEG format, the compression rate can be changed by changing the bit rate (bps) or thinning out image frames, for example. The image conversion circuit 7 basically compresses video data at a constant bit rate (a constant compression rate). When a signal is received from the integration circuit 8, a lower bit rate (a higher compression rate) is set. ). The converted video data is stored in an image memory (memory) 9.

  The ATA controller (transfer control means) 10 writes data to the HDD (recording medium) 11 or reads data from the HDD 11 according to the ATA interface standard, and performs data transfer between the image memory 9 and the HDD 11. In general, the data transfer procedure according to the ATA interface standard is as follows.

  When information such as the size of data to be transferred from the image memory 9 to the HDD 11, the recording position, and the transfer speed is transmitted from the ATA controller 10 to the HDD 11 side and then a transfer command is transmitted to the HDD 11 side, the data is transferred to the ATA controller 10. A built-in DMA (Direct Memory Access) controller transfers data from the image memory 9 to the HDD 11 side while synchronizing with a signal output from the HDD 11 side. The HDD 11 records the transferred data, and returns a transfer end signal to the ATA controller 10 when the recording is completed.

  In this embodiment, the HDD 11 conforming to the ATA interface standard is assumed. However, for example, the ATA controller and the HDD 11 can be changed to conform to other interface standards such as SCSI (Small Computer System Interface). . Further, an optical disk writing drive compatible with DVD-R or DVD-RW can be used instead of the HDD 11. When using an optical disk writing drive, the ATA controller 10 may be changed to one corresponding to the optical disk writing drive as necessary. As described above, the recording medium for recording the video data is not limited to the HDD 11, and the ATA controller 10 can use one according to the recording medium.

  When video data in the NTSC (National Television System Standard Committee) format is converted (compressed) into the MPEG2 format, the data size per second is about several mega to several tens of megabits. Further, the data size per second that can be recorded in the HDD 11 is about several tens to several hundreds of megabits. Accordingly, the data recording speed of the HDD 11 has a sufficient margin, and it is possible to accumulate a certain amount of video data in the image memory 9 and transfer the accumulated video data to the HDD 11 at a time interval. For example, if the data size of video data per second is 8 megabits and the data that the HDD 11 can record per second is 80 megabits, the video data of 80 megabits (10 seconds) is transferred to the HDD 11 in about 1 second. Can be recorded. In this case, the capacity of the image memory 9 is larger than 80 megabits.

  The ATA controller normally transfers the image data stored in the memory 9 together with a unit data size or a predetermined time interval as described above, and transfers them to the HDD 11 for recording. Further, the ATA controller gives a predetermined command to put the HDD 11 in an idling state while the video data is not transferred to the HDD 11. Here, the idling state is a state in which the head in the HDD 11 is moved to a retreat area to put it in a standby state, which can reduce power consumption and reduce the risk of disk damage due to impact.

  FIG. 2 is a diagram showing an outline of temporal displacement of the total data size of the video data stored in the image memory 9 described above. The data transfer period in the figure represents a period from when the ATA controller 10 issues a transfer command to when a transfer end signal is returned. The memory usage in the figure represents the total data size of the video data stored in the image memory 9. As shown in FIG. 2, after the data transfer is completed, when the video data is accumulated and the memory usage increases and reaches a predetermined amount (below the unit data size) or when a predetermined time elapses, the ATA controller 10 The video data stored in the image memory 9 are collectively transferred to the HDD 11 and the free space of the image memory 9 is secured. Although not shown, during the data transfer period, the ATA controller 10 issues a predetermined command so as to be in an idling state.

  When vibration does not occur, the transfer and recording of video data and the idling state are repeated as described above. However, the ATA controller (transfer control means) 10 compares the reference amount (predetermined level) set in advance with the vibration amount (motion amount) detected by the camera shake detection circuit 5, and the vibration amount is greater than the reference amount. In this case, data transfer to the HDD 11 is prohibited. The ATA controller 10 prohibits the transfer if the data transfer exceeds the reference amount at the timing of issuing the transfer command described above, and issues the transfer command when the vibration amount becomes less than the reference amount thereafter. That is, the issue timing of the transfer command is delayed until the vibration becomes equal to or less than the reference amount. The reference amount is set in advance based on a vibration amount serving as a reference for the HDD 11 to stop data writing according to the detection result of the internal vibration sensor, and is set to a value that is the same as or slightly smaller than the reference vibration amount, for example. Is set.

  FIG. 3 is a diagram showing an outline of timing change of data transfer due to the above-described vibration generation. The amount of vibration in the figure represents the amount of vibration detected by the camera shake detection circuit 5, and the transfer prohibition period in the figure represents a period in which data transfer is prohibited when the vibration amount exceeds the reference amount. ing. The explanation of the data transfer period and the memory usage in the figure is the same as in FIG. 2, but the broken line portion of the data transfer period is originally the timing for data transfer, but the data transfer is prohibited by vibration Represents. As shown in the figure, when the vibration amount is greater than or equal to the reference amount, the ATA controller 10 prohibits the issuance of a transfer command and postpones the vibration amount until the vibration amount drops below the reference amount.

  By shifting the issuance of a transfer command during vibration generation (vibration amount ≧ reference amount) to after vibration reduction (vibration amount <reference amount), data transfer is not performed when writing is stopped in the HDD 11, and video Occurrence of a data write error can be prevented. Thus, even when vibration occurs in the middle, video data can be stably written, and loss of video data when vibration occurs can be prevented.

  The unit data size when data is transferred from the image memory 9 to the HDD 11 is basically constant, and the ATA controller 10 collects the video data below the unit data size and transfers it with a time interval. When the vibration continues for a long time, the total data size stored in the image memory 9 also increases, and the total data size stored in the image memory 9 may exceed the unit data size. In this case, the ATA controller (transfer control means) 10 executes the data transfer continuously in a plurality of times. Alternatively, instead of continuously executing the data transfer in a plurality of times, the ATA controller 10 changes the unit data size to twice or more and then executes the data transfer. When the unit data size is changed, data transfer is faster because only one command issuance is required. However, there is a case where the unit data size has an upper limit and cannot be changed.

  FIG. 4 is a diagram showing an outline of a data transfer timing change when vibration generation continues for a long time. The description of the vibration amount, the transfer prohibition period, the data transfer period, and the memory usage capacity in the figure is the same as in FIG. In the example of the figure, data transfer for two times is prohibited by vibration, and after the vibration amount is reduced below the reference amount, data transfer is performed twice by the ATA controller 10. By performing data transfer twice in succession, it is possible to quickly secure free space and prepare for the next vibration.

  Further, when data transfer from the image memory 9 to the HDD 11 is prohibited during the occurrence of vibration, the total data size stored in the image memory 9 increases and free space decreases as the vibration duration time increases. There is a possibility of over. In the present invention, when the vibration continuation time reaches a predetermined time, a signal is sent from the integration circuit 8 to the image conversion circuit 7, and the image conversion circuit 7 reduces the compression rate of the video data by reducing the MPEG bit rate. Increase and decrease the data size after compression per unit time. The predetermined time is set based on the bit rate of the video data and the capacity of the image memory 9.

  FIG. 5 is a diagram showing an outline of changing the compression rate of the video data described above. The explanation of the vibration amount, the transfer prohibition period, the data transfer period, and the memory usage amount in the figure is the same as that in FIG. A point A in the figure represents the timing at which a signal is sent from the integration circuit 8 to the image conversion circuit 7. In the example of the figure, data transfer for three times is prohibited by vibration, and after the vibration amount is reduced below the reference amount, data transfer is performed three times by the ATA controller 10.

  However, if the compression rate is not changed, video data may be lost due to the overflow of the image memory 9 as indicated by the alternate long and short dash line. However, the image conversion circuit 7 performs the compression rate according to the signal from the integration circuit 8. Is increased halfway (point A), the data size is reduced, the overflow of the image memory 9 is prevented, and no video data is lost. Note that after three consecutive data transfers, the image memory 9 has enough free space, so that the image conversion circuit 7 receives, for example, a continuous data transfer completion notification from the ATA controller 10, or After obtaining the free space in the image memory 9 and confirming that the free space is greater than or equal to a predetermined value, the compression rate is restored.

  In this embodiment, the vibration detection based on the motion amount (vector amount) of the video data has been described as an example. However, as another method, the vibration detection is performed by the angular velocity sensor provided in the lens 1 portion or the like. The applied vibration can be detected by any vibration detection method. FIG. 6 is a block diagram illustrating a configuration example of a digital video camera (data recording apparatus) that detects vibration with an angular velocity sensor. In FIG. 6, an angular velocity sensor 15 is provided instead of the camera shake detection circuit 5 of the digital video camera shown in FIG. However, the angular velocity sensor 15 is connected to the camera shake correction circuit 6, the integration circuit 8, and the ATA controller 10, and sends a vibration detection signal to the camera shake correction circuit 6, the integration circuit 8, and the ATA controller 10. However, it is more advantageous in terms of size and cost to detect vibration based on video data in an image processing circuit portion such as a camera shake detection circuit than to add a vibration detection sensor such as an angular velocity sensor.

  In the embodiment described above, data transfer from the image memory 9 to the HDD 11 is prohibited when the vibration amount exceeds the reference amount, but data transfer is performed when vibration is detected (vibration amount> 0). It is also possible to prohibit it. In the present embodiment, the video data is transferred from the image memory 9 to the HDD 11 with a predetermined size unit or at a predetermined time interval with a time interval. However, the ATA controller 10 always transfers the video data stored in the image memory 9. It is also possible to transfer to the HDD (recording medium) 11 (without leaving a time interval). In particular, when using a recording medium such as a DVD-R or DVD-RW whose data writing speed is slower than that of a hard disk, it is preferable to always transfer data from the image memory 9 to the recording medium.

  In the present embodiment, the compression rate is changed when the vibration duration time reaches a predetermined time. However, the used capacity or the free capacity of the image memory 9 is monitored by the image conversion circuit 7, and the used capacity or It is also possible for the image conversion circuit 7 to change the compression rate when the free capacity reaches a predetermined capacity. The amount of video data stored in the image memory 9 is substantially proportional to the duration of vibration, and a rough value can be found from the duration of vibration, but it is more accurate to monitor the used capacity or free capacity of the image memory 9. The value is better understood.

  Further, the compression rate can be changed in stages. For example, it is possible to increase the compression rate when the vibration duration time reaches the first predetermined time, and further increase the compression rate when the vibration duration time reaches the second predetermined time. The data recording apparatus is not limited to recording video data, and can record audio data or image data such as JPEG.

It is a block diagram which shows the structural example of the digital video camera (data recording device) which concerns on this invention. It is a figure which shows the outline of the time displacement of the total data size of the video data memorize | stored in an image memory. It is a figure which shows the outline of the timing change of the data transfer by vibration generation. It is a figure which shows the outline of the timing change of the data transfer when vibration generation continues for a long time. It is a figure which shows the outline of a change of the compression rate of video data. It is a block diagram which shows the structural example of the digital video camera (data recording device) which detects a vibration with an angular velocity sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens 2 Iris 3 Image pick-up element 4 Camera signal processing circuit 5 Camera shake detection circuit 6 Camera shake correction circuit 7 Image conversion circuit 8 Accumulation circuit 9 Image memory 10 ATA controller 11 HDD
15 Angular velocity sensor

Claims (5)

A memory for storing inputted data, a recording medium having a larger storage capacity than the memory, and a transfer control means for transferring the data stored in the memory to the recording medium at a time interval longer than the data input interval and storing it. In a data recording device comprising:
Comprising vibration detecting means for detecting vibration applied to the recording medium;
The transfer control means prohibits data transfer when the vibration detected by the vibration detection means when performing data transfer is equal to or higher than a predetermined level, and thereafter performs data transfer when the vibration falls below the predetermined level. A data recording apparatus characterized by being configured.   The transfer control means determines the data size to be transferred from the memory to the recording medium, performs data transfer in units of the determined data size, and stores the data in the memory when the vibration is transferred below the predetermined level. 2. The data recording apparatus according to claim 1, wherein when the total data size of the processed data exceeds the data size, data transfer is performed continuously in a plurality of times.   The transfer control means determines the data size to be transferred from the memory to the recording medium, performs data transfer in units of the determined data size, and stores the data in the memory when the vibration is transferred below the predetermined level. The data transfer is performed by changing the data size to be equal to or greater than the total data size when the total data size of the processed data exceeds the data size. Data recording device. A time measuring means for measuring a vibration duration based on vibration detection of the vibration detecting means;
4. The data recording apparatus according to claim 1, further comprising: a compression unit that compresses data stored in the memory at a compression rate based on the vibration duration time measured by the time measurement unit. In a data recording apparatus comprising a memory for storing input data, a recording medium having a larger storage capacity than the memory, and transfer control means for transferring the data stored in the memory to the recording medium for storage.
Vibration detecting means for detecting vibration applied to the recording medium;
Clocking means for timing the vibration duration based on the vibration detection of the vibration detection means;
Compression means for compressing data stored in the memory at a compression rate based on the vibration continuation time measured by the time measuring means, and the transfer control means is adapted to detect a vibration from the memory in response to detection of vibration by the vibration detecting means. A data recording apparatus configured to prohibit data transfer to a computer.

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