JP2003274363A - Data recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the restorability in reproduction of data recorded on a recording medium by properly selecting retry processing as to an image data recording device which selects skip recording processing and drop recording processing as the retry processing in case of a failure in writing processing of MPEG-based encoded image data to a recording medium. <P>SOLUTION: A data kind decision circuit 21 decides a data kind and a data importance deciding circuit 22 decides that the data has high importance according to the data kind when the data include at least one of an SH (sequence header) and an I picture and low importance when not. Then a retry processing selecting circuit 16 selects the skip recording processing for high-importance data and the drop recording processing for low-importance data. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording apparatus for performing a retry process when a process of writing coded data such as MPEG compressed image data to a recording medium fails. In particular, the present invention relates to a measure for increasing the recoverability when reproducing recorded data.

[0002]

2. Description of the Related Art For example, in an image data recording apparatus for recording image data on a recording medium, as shown in FIG. 9, image data input from an external device 240 such as a host computer to an interface section 230 is After being converted into a modulation code of a predetermined modulation method by the modulation / demodulation circuit 150, it is input to the signal processing circuit 140 and temporarily stored in the recording processing buffer 200. Then, by the writing process of the signal processing circuit 140, the data in the recording processing buffer 200 is converted into an optical signal, and the optical head 130 irradiates the recording medium 110 with laser light. At this time, the recording medium 110 is the motor 12 controlled by the motor drive circuit 190.
When the optical signal is 0, the optical signal is rotationally driven so that each block area on the recording medium 110 is sequentially irradiated.

In such an image data recording device,
When recording image data having a particularly large amount of information on the recording medium 110 having a small storage capacity, it is essential to perform high-efficiency coding (data compression) on the image data. In order to meet such a demand, a high-efficiency coding method using a time-series correlation of image data has been proposed. As an example thereof, MPEG (Moving Picture E) is proposed.
xpert Group) method.

By the way, when image data is sequentially written in the recording medium 110 by the image data recording device,
The writing process may fail due to fingerprints, scratches, dust, etc. on the recording medium 110. Then, when it fails, a write retry process is performed, and such a retry process includes a skip recording process and a drop recording process.

The skip recording process is, when it is detected that recording is impossible during writing of data, the target block area of the writing process is determined to be the unrecordable area 71, as shown in FIG. It is a retry process of skipping and skipping, and performing the writing process again for the next block area.

In this retry process, no loss occurs in the capacity of the recording medium in the case of a system in which the number of blocks and the number of sectors are equal, but it is more than necessary if one block is data composed of a plurality of sectors. Since it occupies a large area, the loss of media resources is large. If the skip recording process is repeated too many times, the reproduction process is performed in parallel while the non-recordable area is skipped when the image data is reproduced. The capacity is extremely reduced or approaches the sky.
In order to avoid such a situation, the system performs processing such as reducing the transfer rate of the playback data so that the playback buffer is not emptied as much as possible. Since the amount of information decreases, the quality of reproduced data during reproduction is likely to be lost. Therefore, as described below, the drop recording process is also used.

As shown in FIG. 5, the drop recording process means that even if the system side recognizes that a certain block area is the unrecordable area 71, it is forcibly written to the unrecordable area 71. This is a retry process for performing an embedded process, in which case an ECC process (error correction process) is performed during data reproduction.
By the error correction by, the recorded data can be restored to the normal state as much as possible. In the case of this recording process, it is possible to prevent the reproduction data buffer from becoming empty, but there is a limit to the error correction by the ECC process, and the recorded data may be completely normal depending on the recording state and the amount of errors included. It is impossible to restore the normal state.

Therefore, in the conventional image data recording apparatus,
When the write success / failure determination circuit 170 determines that the write processing of the signal processing circuit 140 has failed, the retry number determination circuit 180 determines whether or not the number of consecutive skip processing times reaches the allowable number, and the retry processing is performed. Selection circuit 16
A value of 0 selects the skip recording process when the number of consecutive skip processes is less than the allowable number, and selects the drop recording process when the number of consecutive skip processes reaches the allowable number.

[0009]

However, in the case of the conventional image data recording apparatus, when the image data writing process fails, the retry process is mechanically performed based on the number of consecutive skip recording processes. Since it is selected, it is added to an intra-frame coded image (hereinafter referred to as I picture) of a group of pictures (hereinafter referred to as GOP) which is data of a certain unit of motion picture, or to the GOP. A sequence header (hereinafter referred to as SH) may be lost, and as a result, there is a drawback in that high reconstructibility cannot be obtained when reproducing image data recorded on a recording medium.

The present invention has been made in view of the above points, and its main purpose is to perform skip recording processing or drop recording processing when writing processing of encoded data such as image data to a recording medium fails. In a data recording device that is configured to select multiple retry processes such as a process, the retry process can be properly selected by improving the selection criteria of the retry process, and thus the resilience during reproduction is improved. Thus, it is to be able to write data in the recording medium.

[0011]

In order to achieve the above object, in the present invention, the degree of importance at the time of data restoration is determined, and the retry process is selected based on the determination result, so that the reproduction is performed. The data can be written to the recording medium so that the resilience of the data can be improved.

Specifically, according to the first aspect of the present invention, a writing processing means for sequentially performing the writing processing of the encoded data and the writing processing of the writing processing means are performed on the recording medium. For each time, the write success / failure determination means for determining whether or not the write processing is successful, and the data recorded in the recording medium for the data to be written by the write processing means are restored at the time of reproduction. And a retry process selecting unit that selects the retry process of the write process failure data performed by the write processing unit based on the determination result of the importance determining unit. To Then, when the write success / failure determination unit determines that the write process has failed, the write processing unit performs the retry process selected by the retry process selection unit and writes the write process failure data to the recording medium. It is assumed that it is configured as follows.

According to a second aspect of the present invention, in the first aspect of the present invention, the retry process selecting means reproduces the record data written in the recording medium when the importance degree determining means determines that the data is of high importance. The retry process for high resilience is selected so that the resilience is high and the data transfer speed is low. On the other hand, when the data is judged to be low in importance by the importance determination means, it is written in the recording medium. It is assumed that the retry process for high-speed transfer is selected so that the recoverability at the time of reproducing recorded data is low and the data transfer rate is high.

According to a third aspect of the present invention, in the second aspect of the present invention, a retry is performed to determine whether or not the number of consecutive high resilience retry processes performed by the write processing means is less than a preset allowable number. A number of times determining means is provided. Then, the retry processing selection means, based on the determination result of the retry number determination means, when the number of continuous high-restoreability retry processing is less than the allowable number, the data determined to have low importance by the importance determination means. However, it is assumed that the retry process for high resilience is selected.

According to the invention of claim 4, in the invention of claim 2, the retry processing for high resilience considers the recording target area on the recording medium for which the data writing processing has failed as an unrecordable area, and the recording is performed. It is assumed that the skip recording process is performed by performing the writing process in the recording target area immediately after the unusable area.

According to a fifth aspect of the invention, in the second aspect of the invention, the high-speed transfer retry process is a drop recording process for forcibly performing a writing process on a recording target area on a recording medium for which the data writing process has failed. Suppose

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows the configuration of an image data recording apparatus according to Embodiment 1 of the present invention. This recording apparatus records an image data signal encoded by the MPEG system on a recording medium. Used to write to.

First, the MPEG system will be described. In this system, the redundancy in the time axis direction is first reduced by taking the difference between frames of the video signal, and then the discrete cosine transform (DCT) or the like is performed. An image data signal is efficiently encoded by reducing the redundancy in the spatial axis direction using an orthogonal transformation method. In the MPEG system, a moving image of a certain unit, that is, several images is GOP (group of
This is called a "picture" and independent reproduction can be performed for each GOP. Then, in order to enable random access to the GOP in the moving image sequence, as shown in FIG. 2, each GOP 32 has SH31 (sequence header).
Is added. Initial data necessary for reproduction by the composite device, such as image size and pixel aspect ratio, are stored in the SH 31. And the compounder
G specified from the encoding information (bit stream)
By detecting SH31 of OP32 and starting compounding from GOP32, reproduction can be performed from the middle of the moving image sequence.

The image data in the GOP 32 is made up of three types of I picture 33, P picture 34 and B picture 35, and the image signal of each frame is encoded as any type of picture data.

The I picture 33 is an intra-frame coded image and is provided to ensure independence of GOP. In this I picture 33, all macroblocks are intra-frame coded.

The P picture 34 is an inter frame predictive (Inter frame Predictive) coded image, and a prediction residual signal having an I picture 33 that belongs to the past in time as a predicted image is coded. It is generated by In this P picture 34, intraframe coding and interframe coding can be selected for each macroblock. The B picture 35 is a bidirectional prediction (Bi
A predictive residual signal, which is a predictive image that is a predictive image that is a past I picture 33 to a P picture 34, is encoded. As shown in FIG. 3, the macroblock type in the B picture 35 includes intraframe coding that does not use the preceding and following predictions, forward prediction coding that is predicted from a past reproduced image, and prediction from the future. There is an inverse predictive coding that is performed and an interpolative predictive coding that uses both forward and backward prediction.
That is, the P picture 34 and the B picture 35 are generated based on the I picture 33.

The image data recording device is connected to an external device 24 such as a host computer for outputting image data to be recorded, and the data output from the interface part 23 is modulated by a predetermined modulation method. A modulation / demodulation circuit 15 for converting into a code, a signal processing circuit 14 for writing the data output from the modulation / demodulation circuit 15 to the recording medium 11, and a recording process for temporarily storing the data input to the signal processing circuit 14. Buffer 20, an optical head 13 for converting the data in the recording processing buffer 20 into an optical signal and irradiating the recording medium 11 with a laser based on the writing processing of the signal processing circuit 14, and the optical head 13 from the optical head 13. A recording medium 11 is rotated by a motor 12 so that an optical signal is sequentially emitted from the recording medium 11. Based on the output signal from the chair unit 23, a motor drive circuit 19 for driving the motor 12 it is provided.

The recording processing buffer 20 is internally divided into a plurality of blocks, and data is sequentially accumulated in each block. As an example, a case where the inside is divided into two blocks, buffer A and buffer B, will be described. While writing the data in the buffer A, the next data is stored in the buffer B. When the data writing process of the buffer A is normally completed, the buffer B is switched to and the writing process of the buffer B is continuously performed. During the process of writing the data in the buffer B, the buffer A is cleared and the data is accumulated again. Such an operation is repeated. Further, in this recording device, a write success / failure determination circuit 17 for determining whether or not the write processing by the signal processing circuit 14 is successful, and a case where the write success / failure determination circuit 17 determines that the write processing has failed. In addition, a retry process selection circuit 16 for selecting one of a skip recording process and a drop recording process is provided as a retry process for data that has failed in the writing process.

Specifically, the write success / failure determination circuit 17 includes:
Information on the reflective index of refraction in the block area obtained by irradiating a certain block area of the recording medium 11 with an optical signal of data is input from the optical head 13, and the write success / failure determination is performed. The circuit 17 determines whether or not the writing process to the block area has been normally completed depending on whether or not the reflection refractive index is within a predetermined value range.

The skip recording process and the drop recording process selected by the retry process selection circuit 16 will be described. In the skip recording process, as shown in FIG.
When it is determined that recording is not possible during the process of writing data to a certain block area on the recording medium 11, the block area is determined to be the unrecordable area 71 and skipped.
The data writing process is performed again on the immediately following block area (the block area to the right of the unrecordable area 71 in the figure). On the other hand, in the drop recording process, when it is also determined that the recording is impossible during the data writing process, as shown in FIG.
The writing process of the data is forcibly performed. The signal of the retry process selected by the retry process selection circuit 16 is input to the signal processing circuit 14, and the signal processing circuit 14 receives the signal.
Performs a retry process based on the selection result.

In the present embodiment, the data type determination circuit 21 for determining the type of data stored in the recording processing buffer 20 and the importance of the data based on the determination result of the data type determination circuit 21. A data importance degree determination circuit 22 for determining the degree is provided, and the retry process selection circuit 16 determines the data importance degree determination circuit 22 when the write success / failure determination circuit 17 determines that the write processing has failed. The retry process is selected based on the result.

Specifically, the recording processing buffer 20 is
The data stored in each block is divided into a plurality of blocks, and the data type of each data is determined by the data type determination circuit 21. Here, the data type is S
There are four: H31, I picture 33, P picture 34, and B picture 35.

The data type determination circuit 21 determines the type of data in the following procedure. First, the data is SH3
1 or GOP 32 is determined. When it is determined to be GOP32,
It is determined whether it is the I picture 33, the P picture 34, or the B picture 35. As the determination method, after the start code (code value: 000001B8) of the GOP data is searched by the bit stream, GO
PSC (Picture Start C) in P data
ode, code value: 00000100), and reads 3-bit data 10 bits backward from there. This 3
Bit data is a PCT (Picture Codi)
ng Type). The code of the I picture 33 is
It is “001”, and the code of the P picture 34 is “01”.
0 ”, and the code of the B picture 35 is“ 011 ”.

After the determination of the data type in the recording processing buffer 20 is completed, the data importance degree determination circuit 22 gives priority to the importance degree for each data type. Specifically, from the highest priority, SH3
1, I picture 33, P picture 34, B picture 35
(SH> I picture> P picture> B picture) is prioritized. As an example, I
When the picture 33 and the P picture 34 are mixed, the data is considered to have high priority, and the importance is determined to be high. That is, all of this buffer is regarded as the data of the I picture 33.
However, since the head of the block does not always store the determinable part of the picture type, the type of the immediately preceding data for which the writing process was successful is referred to. Then, when the data is a data type having a high priority, it is considered that the data currently held is also a data having a high priority. In this way, the importance of the data is determined. Based on this determination result, the retry process selection circuit 16 selects the skip recording process for the data determined to have high importance, and selects the drop recording process for the data determined to have low importance. To do.

Next, the operation of the image data recording apparatus configured as described above will be described. The image data is transferred from the external device 24 such as a host computer to the interface unit 2.
The signal is input via the signal processing circuit 3, converted into a modulation code of a predetermined modulation method by the modulation / demodulation circuit 15, and then input to the signal processing circuit 14. Then, after being stored in a block of the recording processing buffer 20, the signal is converted into an optical signal by the optical head 13 by the writing processing of the signal processing circuit 14 and written as recording data in the target block area on the recording medium 11.
At this time, the write success / failure determination circuit 17 determines the success / failure of the writing process.

On the other hand, the data in the recording processing buffer 20 is first processed before the writing processing to the recording medium 11 is performed.
The data type determination circuit 21 determines the data type,
Subsequently, based on the data type, the data importance level determination circuit 22 determines the importance level during data reproduction.
The determination result of the data importance degree determination circuit 22 is input to the retry process selection circuit 16.

When the write success / failure determination circuit 17 determines that the write processing is unsuccessful, the recording processing buffer 20 does not clear the stored data and retains it as it is. Further, the retry processing selection circuit 16 selects the retry processing based on the determination result of the data importance degree determination circuit 22. After that, the signal processing circuit 14 executes the retry process selected by the retry process selection circuit 16.

Therefore, according to the present embodiment, the type of the data stored in the recording processing buffer 20 is determined by the data type determination circuit 21, and based on the determination result, the data is the SH 31 and the I picture 33. The data importance determination circuit 22 determines whether or not the data has at least one of the above, and when the write processing fails, the retry processing selection circuit 16 determines that the importance is high. Since the skip recording process is selected for data and the drop recording process is selected for less important data, each data of SH31 and I picture 33 can be recorded on the recording medium 11 almost certainly. Therefore, it is possible to record the image data on the recording medium 11 so that the image data can be reproduced with high resilience.

Incidentally, in the case of this embodiment, SH3
1, I picture 33, P picture 34, B picture 35
Of the four data types, the SH 31 and the I picture 33 are set to have a high degree of importance. Therefore, at the time of reproduction, as shown in FIG.
The I picture 33 will almost certainly be used.

In the above embodiment, SH31, I
Of the four data types of the picture 33, the P picture 34, and the B picture 35, the SH 31 and the I picture 33 are set to have a high degree of importance. However, for example, the P picture 34 is added as the data of a high degree of importance. This may be done, and as a result, during reproduction, as shown in FIG. 6B, the I picture 33 and the P picture 34 are almost certainly used even in the worst case.

Further, in the above embodiment, the case of the image data recording dedicated apparatus for recording only the image data has been described, but the present invention is applicable to the image data recording / reproducing apparatus having the reproducing function. You can also

(Second Embodiment) FIG. 7 shows the arrangement of an image data recording apparatus according to the second embodiment of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals.

In this embodiment, the retry processing selection circuit 1
When the number of times the skip recording process is selected is counted by 6, it is determined whether the count value has reached the allowable continuous number N, and when the writing success / failure determination circuit 17 determines that the writing process is successful. A continuous retry process determination circuit 18 for clearing the count value is provided.

When the write success / failure determination circuit 17 determines that the writing has failed, the retry process selection circuit 16 skips the recording process for the data determined by the data importance degree determination circuit 22 to have high importance ( (See Figure 4)
In addition to selecting, the retry processing is selected based on the determination result of the continuous retry processing determination circuit 18 for the data determined to have low importance by the data importance determination circuit 22.

An allowable continuous number setting circuit 25 for changing the allowable continuous number N of the continuous retry processing judging circuit 18 is provided. The number of consecutive times N can be changed.

Specifically, the retry process selection circuit 16
Selects the skip recording process when the count value of the continuous retry process determination circuit 18 is less than the allowable continuous number N (count value <N), while the count value has reached the allowable continuous number N (count value When ≧ N), the drop recording process (see FIG. 5) is selected. However, when the drop recording process is selected, the signal processing circuit 14 increases the number of error corrections in order to improve the capability of the error correction process when writing the data in the unrecordable area.

That is, when the data recorded on the recording medium 11 is reproduced by the image data reproducing apparatus, the reproducing process is performed in parallel with the process for searching the recorded data area. Therefore, the retry process is selected. There is a risk that the reproduction processing buffer of the image data reproducing apparatus will become empty, and an allowable continuous number setting circuit 25 is provided to cope with such a situation. As a basis for setting, the allowable continuous number N is N = (reproduction buffer data holding time) /
(Time required to find the data recording part). The reproduction buffer data holding time is the time (buffer capacity / data transfer rate) required from the buffer full state of the reproduction data until the reproduction buffer becomes empty by the reproduction processing. In this way, the allowable continuous number N is obtained.

Based on such a premise, in the first embodiment,
While skip recording processing is selected only for data with high importance, in the present embodiment, in addition to this, when the number of continuous skip recording processes is less than the allowable continuous number N, data with low importance (for example, B picture 3
Regarding 5), the skip recording process is selected so that the problem at the time of reproduction can be improved. That is,
In consideration of a situation in which the data transfer rate is likely to decrease during reproduction if the skip recording process continues too much during recording, the retry process is selected based on two pieces of information, the data importance and the number of continuous skip recording processes. By doing so, problems in reproducing recorded data are less likely to occur.

Next, the retry process selection process in the image data recording apparatus configured as described above will be described with reference to FIG. Note that, here, a case will be described in which the image data stored in the block of the recording processing buffer 20 is data other than SH31.

In step S1, the data input from the modulation / demodulation circuit 15 to the signal processing circuit 14 is stored in one block of the recording processing buffer 20.

In step S2, the recording processing buffer 2
The data type determination circuit 21 determines the type of data stored in the 0 block.

In step S3, the data type determination circuit 2
Based on the determination result of No. 1, it is determined whether the data includes the I picture 33 and has high importance, or whether the data includes only the data other than the I picture 33 and has low importance. When it is determined that the data is of high importance, the process proceeds to step S4. On the other hand, when it is determined that the data is of low importance,
Move to step S5.

In step S5, the continuous retry process determination circuit 18 determines whether or not the count value of the continuous skip recording process count is less than the allowable continuous count N (count value <N). When the count value is less than the allowable consecutive number N, the process proceeds to step S4. on the other hand,
When the count value has reached the allowable continuous number N, the process proceeds to step S6.

In step S4, the retry process selection circuit 16 selects the skip recording process, and the retry process selection process is completed.

On the other hand, in step S6, the retry recording selection circuit 16 selects the drop recording processing, and with this, the retry processing selection processing ends.

Therefore, according to the present embodiment, in addition to selecting the skip recording process when the writing process of highly important data fails, the continuous number of skip recording processes is less than the allowable continuous number N. In some cases, even if the data is of low importance, the skip recording process is selected, so that the reproduction process buffer becomes empty and the data transfer rate becomes slow when the image data reproducing device reproduces the recorded data. While avoiding the situation, it is possible to obtain the effect of improving the restoration property during data reproduction.

Moreover, since the allowable continuous number setting circuit 25 can change the allowable continuous number N,
When the capacity of the reproduction processing buffer and the data transfer rate of the image data reproducing apparatus used for reproducing the recorded data are known, the allowable continuous number N can be adjusted accordingly, and thus the above-mentioned effect can be efficiently achieved. You can get well.

[0054]

As described above, according to the present invention,
When the process of writing the data to the recording medium fails, the retry process is selected based on the importance of the resilience when reproducing the data, so that the resilience when reproducing the data can be improved. it can.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a data recording device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a structure of image data compressed according to the MPEG standard.

FIG. 3 is a diagram additionally showing arrangement of image data in an encoding process and a decoding process on a recording medium in MPEG compression.

FIG. 4 is a diagram showing an arrangement of data on a recording medium by skip recording processing.

FIG. 5 is a diagram showing an arrangement of data on a recording medium by a drop recording process.

FIG. 6 is a diagram showing a case where only I pictures are used during reproduction (a) and a case where I pictures and P pictures are used (b).

FIG. 7 is a diagram corresponding to FIG. 1 showing a configuration of an image data recording device according to a second embodiment of the invention.

FIG. 8 is a flowchart showing a selection process at the time of retry.

9 is a diagram corresponding to FIG. 1 showing the configuration of a conventional image data recording device.

[Explanation of symbols]

11 recording media 14 signal processing circuit (writing processing means) 16 Retry process selection circuit (retry process selection means) 17 Write success / failure determination circuit (write success / failure determination means) 18 Continuous retry process determination circuit (continuous process determination means) 22 Data importance judging circuit (importance judging means) 31 SH (highly important data) 33 I picture (highly important data) 34 B picture (low importance data) 35 P pictures (low importance data)

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Claims (5)

[Claims] 1. A writing processing means for sequentially performing writing processing of encoded data on a recording medium, and each time the writing processing of the writing processing means is performed, the writing processing is successful. Write success / failure determining means for determining whether or not, and importance of determining the importance of restoring the data recorded on the recording medium at the time of reproduction, with respect to the data subjected to the write processing by the write processing means. The write processing means includes a determining means and a retry processing selecting means for selecting a retry processing for writing the data of the write processing failure to the recording medium again based on the determination result of the importance degree determining means. When the write success / failure determination unit determines that the write process is unsuccessful, the retry process selected by the retry process selection unit is performed to write the write process failure data to the recording medium. A data recording device having the following configuration. 2. The data recording apparatus according to claim 1, wherein the retry process selecting means restores the data recorded on the recording medium at the time of reproduction when the importance determining means determines that the data has a high importance. While the retry processing for high resilience is selected, in which the data transfer rate at the time of reproduction becomes low and the data transfer rate at the time of reproduction becomes low, when the importance degree of the data is determined to be low by the importance degree determining means, the data recorded on the recording medium The data recording device is configured to select a retry process for high-speed transfer, which has a low restoration property during reproduction and a high data transfer speed during reproduction. 3. The data recording device according to claim 2, wherein it is determined whether or not the number of consecutive high resilience retry processes performed by the writing processing unit is less than a preset allowable number of times. And a retry process selecting unit, based on the determination result of the retry count determining unit, when the number of consecutive high-restoreability retry processes is less than the allowable number, the importance determining unit determines the importance level to be low. A data recording device configured to select a retry process for high resilience with respect to data determined to be. 4. The data recording apparatus according to claim 2, wherein the retry processing for high resilience regards the recording target area on the recording medium for which the data writing processing has failed as an unrecordable area, and the unrecordable area. The data recording apparatus is characterized in that it is a skip recording process of performing a writing process in a recording target area immediately after. 5. The data recording apparatus according to claim 2, wherein the high speed transfer retry process is a drop recording process for forcibly performing a writing process on a recording target area on a recording medium for which the data writing process has failed. A data recording device characterized by the above.