JP2001023295A - Data recording method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a decrease in recording capacity, an increase in power consumption, etc., by reducing generation of fragmentation. SOLUTION: Referring to a capacity of audio data DA of the music for dubbing to be reproduced from CD 21 and record information of MD 31 (information on unrecorded parts and recorded parts), the device judges whether or not MD 31 has an unrecorded part thereon enough to continuously record all of the audio data DA of the music for dubbing. When MD 31 has such an unrecorded part, the audio data DA are continuously recorded on the unrecorded part. In such a manner, the generation of fragmentation is decreased. Therefore, the increase of the number of necessary overhead areas between the recorded part and new recording part and the decrease of recording capacity can be suppressed. Moreover, since the head is decreased in the movement of being shifted to succeeding points at the time of recording and reproducing, the power consumption related to the servo system can be suppressed. Moreover, troubles such as data break-off can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a data recording method and a data recording device for recording digital data on a disk-shaped recording medium. Specifically, when there is an unrecorded portion on the disk-shaped recording medium in which all of the recorded digital data can be continuously recorded, recording digital data is recorded in the unrecorded portion, thereby reducing the occurrence of fragmentation and reducing the recording capacity. The present invention relates to a data recording method and a data recording device in which a decrease and an increase in power consumption are suppressed.

[0002]

2. Description of the Related Art Conventionally, for example, an MD (mini-disc) has been known as a disc-shaped recording medium. At the time of dubbing for recording digital audio data reproduced from, for example, a CD (compact disc) on the MD, recording is usually started from the innermost unrecorded portion.

[0003]

As described above, in the case where the recording is started from the innermost unrecorded portion, the capacity of digital audio data reproduced from the CD is limited to the innermost portion. If the recording capacity is larger than the recording capacity of the unrecorded part, the digital audio data is recorded in two or more unrecorded parts, and fragmentation occurs.

[0004] For example, consider the case where the recording state of the MD is as shown in FIG. 4A. In this case, from the inner circumference to the outer circumference, an unrecorded portion having a length of α [s], a recorded portion (track 1) having a length of β [s], and an unrecorded portion having a length of γ [s] ,
There is a recorded portion (track 2) having a length of θ [s] and an unrecorded portion having a length of η [s].

[0005] The MD in the recording state as shown in FIG.
[s] length (α−Δ <ε <α + γ−3Δ, γ−Δ <ε,
The case where the track 3 of ε <η−Δ) is formed will be described. In this case, as shown in FIG.
Recording is started from the beginning of the unrecorded portion having a length of [s], and α-Δ
Recorded to the length of [s], and then recorded part (track 1)
The head is moved to the next unrecorded portion having the length of γ [s] while leaving an overhead area having the length of Δ [s] before the portion, and then after the recorded portion (track 1), Δ [s Start recording while leaving an overhead area of length ε-α +
Record up to the length of Δ [s]. Here, the overhead area having a length of Δ [s] is provided in order to prevent erasure of recorded data by tracing the recorded portion with a high laser power when the recorded portion and the new recorded portion are adjacent to each other. Corresponding to the physical spacing required.

Next, an MD in a recording state as shown in FIG.
And the length of υ [s] (γ−ε + α−4Δ <υ <α−
The case of forming the track 4 of Δ, γ-2Δ <υ) will be described. In this case, as shown in FIG. 4C, γ−ε +
Recording is started in a state where an overhead area having a length of Δ [s] is left behind a recorded portion (track 3) in an unrecorded portion having a length of α-2Δ [s], and γ−ε + α−4Δ [s ] And then move the head to the next unrecorded part of η [s] length with the overhead area of Δ [s] left before the recorded part (track 2) Then, recording is started in a state where an overhead area having a length of Δ [s] is left behind the already recorded portion (track 2), and υ−γ + ε−α + 4Δ
Record up to [s] length.

In an MD in a recording state as shown in FIG. 4C,
Logically, a recorded portion has a length of β + θ + ε + υ [s], and an unrecorded portion has a length of η−υ + γ-ε + α-5Δ [s].

As described above, when the fragmentation occurs, the number of overhead areas having a length of Δ [s] increases, which causes a problem that the recording capacity decreases. In addition, when the fragmentation occurs as described above, it is necessary to move the head to a continuation destination during recording or reproduction, and there is a problem that power consumption of the servo system increases.

Further, as described above, when fragmentation occurs, it is necessary to move the head to the continuation destination during recording or reproduction, but when the memory capacity of the data buffer is small, the buffer memory overflows or underflows when the head moves. There is a possibility that the recording data and the reproduction data are interrupted due to a flow. In addition,
The overflow and underflow described above can be prevented by increasing the memory capacity of the data buffer, but the apparatus becomes expensive this time.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a data recording method and the like capable of reducing the occurrence of fragmentation and suppressing a decrease in recording capacity and an increase in power consumption.

[0011]

A data recording method according to the present invention is a data recording method for recording recording digital data on a disk-shaped recording medium, comprising: a first step of acquiring a recording digital data capacity; A second step of retrieving recording information of the disc-shaped recording medium, a capacity of the recording digital data obtained in the first step,
A third step of determining whether or not there is an unrecorded portion capable of continuously recording all of the recorded digital data on the disc-shaped recording medium with reference to the recording information of the disc-shaped recording medium searched in the second step; When it is determined that there is an unrecorded portion that can be continuously recorded in the third step and the third step,
The fourth step of recording the recording digital data in the unrecorded portion and the third step determine that there is no unrecorded portion that can be continuously recorded. And a fifth step of recording the recording digital data.

Further, a data recording method according to the present invention is characterized in that:
What is claimed is: 1. A data recording apparatus for recording recorded digital data on a disc-shaped recording medium, comprising: a data capacity acquiring unit for acquiring a capacity of the recorded digital data; a recording information retrieving means for retrieving recording information of the disc-shaped recording medium; The capacity of the recorded digital data acquired by the acquisition means,
Judging means for judging whether or not there is an unrecorded portion capable of continuously recording all of the recorded digital data on the disc-shaped recording medium by referring to the recording information of the disc-shaped recording medium searched by the recorded information searching means. When the determination unit determines that there is an unrecorded portion that can be continuously recorded, the recording digital data is recorded in the unrecorded portion, and the determination unit determines that there is no unrecorded portion that can be continuously recorded. Data recording means for recording the recorded digital data in the unrecorded portion of the disk-shaped recording medium having the largest recording capacity.

In the present invention, when recording digital data is to be recorded on a disk-shaped recording medium, the capacity of the recording digital data is obtained, and the recording information (unrecorded portion and recorded portion) of the disk-shaped recording medium is obtained. Information) is performed. When the recorded digital data is, for example, digital audio data of one or a plurality of music pieces reproduced from a CD, the above-mentioned capacity can be obtained from TOC (Table Of Contents) information recorded on the CD. When the disc-shaped recording medium is an MD, the UTOC (User Table) recorded on the MD is used.
Of Contents) information is retrieved.

An unrecorded portion capable of continuously recording all of the recorded digital data on the disc-shaped recording medium with reference to the capacity of the recorded digital data thus obtained and the recording information on the disc-shaped recording medium. It is determined whether or not there is. When there is an unrecorded portion that can be continuously recorded, the recording digital data is recorded in the unrecorded portion. On the other hand, when there is no unrecorded portion that can be continuously recorded, the recording capacity of the disc-shaped recording medium is the largest unrecorded portion. The recording digital data is recorded in the recording unit.

As a result, the occurrence of fragmentation is reduced. For example, when the disc-shaped recording medium is an MD, the increase in the number of overhead areas described above can be suppressed, and a decrease in the recording capacity can be suppressed. Also,
Moving the head to the continuation destination during recording or reproduction is reduced, and power consumption related to the servo system is suppressed. In addition, the head is less likely to be moved to the continuation destination during recording or reproduction, and even if the memory capacity of the data buffer is small, the buffer memory may overflow or underflow, causing interruption of the recorded data or reproduction data. Less.

There may be a case where there are a plurality of unrecorded portions which can be continuously recorded. For example, when a disk-shaped recording medium is to be recorded and reproduced in a constant linear velocity system, the recording digital data is recorded in the outermost unrecorded portion of the plurality of unrecorded portions. . Thereby, the angular velocity of the disk-shaped recording medium required at the start of recording / reproduction can be made slower than in the case where recording is performed on the inner peripheral side.
Therefore, the operation can be started in a short time at the time of recording or reproduction, and the power consumption at the time of reproduction can be reduced at the time of recording.

When there are a plurality of unrecorded portions which can be continuously recorded, the recording digital data is recorded, for example, in the unrecorded portion having the smallest recording capacity among the plurality of unrecorded portions. As a result, an unrecorded portion having a large recording capacity can be kept as it is, and the occurrence of fragmentation at the time of subsequent recording can be reduced.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an audio system 10 as an embodiment. The audio system 10 includes a CD unit 20 for handling a CD (compact disc), an MD unit 30 for handling an MD (mini-disc), and a system controller 40 for controlling the operation of the entire system. The MD is recorded and reproduced by a constant linear velocity method. The system controller 40 includes an operation unit 41 for the user to perform various operations on the CD unit 20 and the MD unit 30, and a system state, a user operation state, and the like.
A display unit 42 composed of a quid crystal display is connected.

In FIG. 1, the CD section 20 and the M
Regarding the inside of the D section 30, for the sake of simplicity,
Only the part relating to the dubbing operation of recording the digital audio data DA reproduced from the CD by the D unit 20 on the MD by the MD unit 30 is shown.

The CD section 20 will be described. The CD 21 is rotated by a spindle motor 22. The operation of the spindle motor 22 is controlled by a servo circuit 23 so that the CD 21 rotates at a constant linear velocity during reproduction. The reproduction of the CD 21 is performed using an optical head 24 using a laser beam. This optical head 24
The operations such as focus, tracking, and seek are controlled by the servo circuit 23.

A reproduction signal output from the optical head 24 is supplied to a reproduction processing circuit 25, and the reproduction processing circuit 2
In step 5, the reproduced signal is subjected to digital demodulation, error correction, and other processing to obtain digital audio data DA. The operations of the reproduction processing circuit 25 and the servo circuit 23 described above are controlled by the system controller 40, respectively. Although not described above, the TOC information reproduced from the CD 21 is supplied to the system controller 40 through the reproduction processing circuit 25. Thus, the system controller 40 can grasp the data capacity of each music piece recorded on the CD 21.

The MD section 30 will be described. The MD 31 is rotated by a spindle motor 32. The operation of the spindle motor 32 is controlled by a servo circuit 33 so that the MD 31 rotates at a constant linear speed during recording or reproduction. Further, recording on the MD 31 is performed in cooperation with the laser beam from the optical head 34 and the magnetic head 37 (recording by a magnetic field modulation method). The reproduction of the MD 31 is performed using the optical head 34. Optical head 3
The operations such as focus, tracking, and seek of 4 are controlled by the servo circuit 33.

The digital audio data DA obtained by the reproduction processing circuit 25 of the CD section 20 is supplied to a recording processing circuit 35 via a buffer memory 38.
In the recording processing circuit 35, processing such as data compression, error correction coding, and digital modulation is performed on the digital audio data DA to obtain a recording signal. The recording signal is supplied to the magnetic head driver 36, and is supplied to the MD 31. Be recorded. The operations of the recording processing circuit 35 and the servo circuit 33 described above are performed by the system controller 40, respectively.
Is controlled by In addition, U reproduced from the MD 31
The TOC (User Table Of Contents) information is supplied to the system controller 40 through a reproduction processing circuit (not shown). Thereby, the system controller 40
Can search the state (recording state) of the unrecorded part (recorded area that has not yet been recorded) and the recorded part (recorded area that has already been recorded) of the MD 31.

Next, using the flowchart of FIG.
In the audio system 10 of FIG. 1, the control operation of the system controller 40 when an instruction to dub a predetermined song (one or more songs) from the CD 21 to the MD 31 by an operation of the operation unit 41 by the user will be described. I do.

First, in step ST1, the TO of the CD 21 is
By referring to the C information, the recording data capacity of the music piece instructed to be dubbed (hereinafter referred to as “dubbing music piece”) is obtained. Next, in step ST2, the UTOC of MD31
With reference to the information, the recording information of the MD 31 (information of the unrecorded part and the recorded part) is searched.

Next, in step ST3, in step ST1
By referring to the recording data capacity obtained in step ST2 and the recording information of MD31 retrieved in step ST2, it is determined whether or not an unrecorded portion capable of continuously recording all of the digital audio data DA of the dubbing music exists in MD31. judge. If there is an unrecorded portion that can be continuously recorded, step ST4
If there is no unrecorded portion that can be continuously recorded, the process proceeds to step ST5.

In step ST4, the optical head 34 and the magnetic head 37 of the MD section 30 are moved to the start position of the corresponding unrecorded section, and thereafter, the operation proceeds to step ST6. Also,
In step ST5, the optical head 34 and the magnetic head 37 of the MD unit 30 are moved to the start position of the unrecorded portion having the maximum recording capacity, and then the process proceeds to step ST6. In this case, if there is an adjacent recorded part, the start position is naturally set so that an overhead area having the length of Δ [s] described above is provided between the adjacent recorded part. . In step ST4, when there are a plurality of unrecorded portions that can be continuously recorded, the unrecorded portions are moved to the start position of the outermost unrecorded portion among the plurality of unrecorded portions.

In step ST6, the CD unit 20 controls the CD2
The reproduction of the dubbing music is started from 1 and the MD unit 3
At 0, recording on the MD 31 is started. In this case, in the CD section 20, a reproduction signal obtained from the optical head 24 is supplied to the reproduction processing circuit 25, and the reproduction processing circuit 25
The digital audio data Da of the dubbed music is output. In the MD section 30, digital audio data DA of dubbed music output from the CD section 20 is supplied to a recording processing circuit 35, and a recording signal output from the recording processing circuit 35 is supplied to a magnetic head driver 36. Thereby, the magnetic head 37 and the optical head 34
A recording signal is recorded on the MD 31 by the cooperation of the laser beams from the optical disc.

Next, in step ST7, the C
From D21, it is determined whether or not the reproduction of the dubbed music has been completed. This determination is made based on well-known subcoding information reproduced from the CD 21 and supplied from the reproduction processing circuit 25 to the system controller 40. If the reproduction of the dubbed music has not been completed, in step ST8, the MD3
It is determined whether the recording position of No. 1 has reached the recorded portion.
This determination is made based on address information obtained from a pre-groove formed in the MD 31 as is well known. In this case, in order to provide an overhead area with the length of Δ [s] described above between the recorded portion and the recorded portion, a position that is Δ [s] before the recorded portion is actually set as the arrival determination position. .

If the recording position of the MD 31 reaches the recorded part before the reproduction of the dubbed music from the CD 21 ends, in step ST9, the reproduction operation of the CD part 20 is temporarily stopped, and the reproduction of the MD part 30 is stopped. The recording operation is temporarily stopped, and thereafter, the process returns to step ST1. Then, while obtaining the remaining recording data capacity of the above-mentioned dubbed music, the recording information of the MD 31 is searched in step ST2, and the above-mentioned operation after step ST3 is repeated.

If the reproduction of the dubbed music from the CD 21 is completed in step ST7, the process proceeds to step ST10, in which the reproduction operation in the CD unit 20 is stopped, and the recording operation in the MD unit 30 is stopped. In ST11, the UTOC information of the MD 31 is changed in accordance with the recording state, and the control operation ends.

As described above, in the present embodiment, the digital audio data DA of the dubbed music reproduced from the CD in the CD section 20
At the time of dubbing to be recorded in D31, it is determined whether or not there is an unrecorded portion in the MD31 in which all of the digital audio data DA of the dubbed song can be continuously recorded. Of the digital audio data DA.

Therefore, the occurrence of fragmentation is reduced, the increase in the number of overhead areas can be suppressed, and the decrease in recording capacity can be suppressed. In addition, the head is less likely to be moved to the continuation destination during recording or reproduction, and power consumption related to the servo system can be suppressed. Also, during recording or reproduction, the head is less likely to move to the continuation destination, and even if the memory capacity of the data buffer is small,
It is less likely that the buffer memory will overflow or underflow, causing breaks in the recorded data or reproduced data.

For example, consider the case where the recording state of the MD is as shown in FIG. 3A. In this case, from the inner circumference to the outer circumference, an unrecorded portion having a length of α [s], a recorded portion (track 1) having a length of β [s], and an unrecorded portion having a length of γ [s] ,
There is a recorded portion (track 2) having a length of θ [s] and an unrecorded portion having a length of η [s].

The MD in the recording state as shown in FIG.
[s] length (α−Δ <ε <α + γ−3Δ, γ−Δ <ε,
The case where the track 3 of ε <η−Δ) is formed will be described. In this case, the track 3 having the length of ε [s] is MD
Can be continuously recorded in the unrecorded portion having the length of η [s] on the outermost side of Therefore, as shown in FIG. 3B, recording is started in a state where an overhead area having a length of Δ [s] is left behind a recorded portion (track 3) in an unrecorded portion of η [s], and recording is performed to the end. I do. At this time, after this track 3,
An unrecorded portion having a length of η-ε-Δ [s] remains.

Next, the MD in the recording state as shown in FIG.
And the length of υ [s] (γ−ε + α−4Δ <υ <α−
The case of forming the track 4 of Δ, γ-2Δ <υ) will be described. In this case, the track 4 having the length of this [s]
Can be continuously recorded in the unrecorded portion having the length of α [s] on the innermost side. Then, as shown in FIG. 3C, α [s]
From the beginning of the unrecorded part of the length to the end through the recording. At this time, after track 4, α-υ
An unrecorded portion having a length of [s] remains.

In the MD in the recording state as shown in FIG. 3C,
Logically, a recorded portion has a length of β + θ + ε + υ [s], and an unrecorded portion has a length of η−υ + γ−ε + α−Δ [s].

As described above, in the operation example of the present embodiment described with reference to FIGS. 3A to 3C, the occurrence of fragmentation is suppressed as compared with the conventional operation example described with reference to FIGS. 4A to 4C. You can see that Further, in the operation example according to the present embodiment, since the occurrence of fragmentation is suppressed as described above, the number of overhead areas is reduced, and the recording capacity of the unrecorded portion is 4Δ as compared with the conventional operation example. Just getting more.

In this embodiment, when there are a plurality of unrecorded portions in the MD 31 where all the digital audio data DA of the dubbed music can be continuously recorded,
The digital audio data DA of the dubbed music is recorded in the outermost unrecorded portion of the plurality of unrecorded portions. Therefore, the angular velocity of the MD 31 required at the start of recording / reproduction can be made slower than that at the time of recording on the inner peripheral side, so that the operation can be started in a short time at the time of recording or reproduction, and the reproduction can be started at the time of recording. Power consumption at the time can be reduced.

It is to be noted that the unrecorded portion capable of continuously recording all of the digital audio data DA of the dubbed music is an MD.
When there are a plurality of the dubbed songs, the digital audio data DA of the dubbed song is recorded in an unrecorded portion having the smallest recording capacity instead of recording the digital audio data DA of the dubbed song in the outermost unrecorded portion. It may be. In this case, an unrecorded portion having a large recording capacity can be kept as it is, and there is an advantage that occurrence of fragmentation at the time of subsequent recording can be reduced.

In the above-described embodiment, the present invention is applied to the audio system 10 in which the digital audio data DA of the dubbed music reproduced by the CD unit 20 is recorded by the MD unit 30. Needless to say, the present invention can be similarly applied to other recording systems for recording digital data on a disk-shaped recording medium such as an optical disk or a magnetic disk.

[0042]

According to the present invention, when there is an unrecorded portion in which all of the recorded digital data can be continuously recorded on the disk-shaped recording medium, the recorded digital data is recorded in the unrecorded portion. Can be reduced. Therefore, for example, when the disc-shaped recording medium is an MD, it is possible to suppress an increase in the number of overhead areas required between the already-recorded portion and the new-recorded portion, and to suppress a decrease in the recording capacity. In addition, the head is less likely to be moved to the continuation destination during recording or reproduction, and power consumption related to the servo system is suppressed. In addition, it is less necessary to move the head to the continuation destination during recording or playback,
Even if the memory capacity of the data buffer is small, it is less likely that the buffer memory overflows or underflows and the recording data and the reproduction data are interrupted.

When there are a plurality of unrecorded portions which can be continuously recorded, and when the disk-shaped recording medium is to be recorded and reproduced by the constant linear velocity method, the outermost one of the plurality of unrecorded portions is used. By recording the recorded digital data in the unrecorded area on the side, the angular velocity of the disk-shaped recording medium required at the start of recording / reproduction can be made slower than when recording on the inner circumference, and the recording / reproduction time can be reduced. The operation can be started in a short time, and the power consumption during recording and reproduction can be reduced.

When there are a plurality of unrecorded portions that can be continuously recorded, the recording digital data is recorded in the unrecorded portion having the smallest recording capacity among the plurality of unrecorded portions, thereby reducing the recording capacity. A large unrecorded portion can be kept as it is, and the occurrence of fragmentation at the time of subsequent recording can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a main configuration of an audio system according to an embodiment.

FIG. 2 is a flowchart showing a control operation of a system controller during dubbing.

FIG. 3 is a diagram for explaining an operation example in the embodiment when a new recording unit is added to an MD in a predetermined recording state.

FIG. 4 is a diagram for explaining a conventional operation example when a new recording unit is added to an MD in a predetermined recording state.

[Explanation of symbols]

10 audio system, 20 CD section, 2
DESCRIPTION OF SYMBOLS 1 ... CD (compact disk), 22 ... Spindle motor, 23 ... Servo circuit, 24 ... Optical head, 25 ... Reproduction processing circuit, 30 ... MD part,
31 ... MD (mini disk), 32 ... spindle motor, 33 ... servo circuit, 34 ... optical head, 35 ... recording processing circuit, 36 ... magnetic head driver, 37 ... .Magnetic head, 38... Buffer memory

Claims (6)

[Claims] 1. A data recording method for recording recording digital data on a disk-shaped recording medium, comprising: a first step of acquiring a capacity of the recording digital data; and a step of retrieving recording information of the disk-shaped recording medium. Step 2, the capacity of the recording digital data acquired in the first step, and the recording information of the disc-shaped recording medium retrieved in the second step, with reference to the disc-shaped recording medium. A third step of determining whether or not there is an unrecorded portion where all of the recorded digital data can be continuously recorded; and determining that there is an unrecorded portion which can be continuously recorded in the third step. At this time, there is a fourth step of recording the recording digital data in the unrecorded portion, and there is no unrecorded portion that can be continuously recorded in the third step. When constant, the data recording method characterized by having a fifth step of recording capacity of the disc-shaped recording medium to record the recording digital data to the maximum of the unrecorded portion. 2. The disk-shaped recording medium is recorded and reproduced in a constant linear velocity system. In the fourth step, when there are a plurality of unrecorded portions that can be continuously recorded, the plurality of unrecorded portions are 2. The data recording method according to claim 1, wherein the recording digital data is recorded in the outermost unrecorded portion of the unrecorded portions. 3. In the fourth step, when there are a plurality of unrecorded portions that can be continuously recorded, the recorded digital data is stored in an unrecorded portion having the smallest recording capacity among the plurality of unrecorded portions. The data recording method according to claim 1, wherein the data is recorded. 4. A data recording apparatus for recording recording digital data on a disk-shaped recording medium, comprising: a data capacity acquisition unit for acquiring a capacity of the recording digital data; and a recording apparatus for retrieving recording information on the disk-shaped recording medium. Information retrieval means; the capacity of the recording digital data acquired by the data capacity acquisition means; and the recording information of the disc-shaped recording medium retrieved by the recording information retrieval means. Determining means for determining whether or not there is an unrecorded portion where all of the recorded digital data can be continuously recorded; and The recorded digital data is recorded in the unrecorded area, and when the determination means determines that there is no unrecorded area that can be continuously recorded, the data is recorded. Data recording apparatus recording capacity of disk-shaped recording medium; and a data recording means for recording the recording digital data to the maximum of the unrecorded portion. 5. The disk-shaped recording medium is recorded and reproduced in a constant linear velocity system, and when there are a plurality of unrecorded portions which can be continuously recorded, the data recording means includes a plurality of unrecorded portions. 5. The data recording apparatus according to claim 4, wherein the recording digital data is recorded in an outermost unrecorded portion of the unrecorded portions. 6. When there are a plurality of unrecorded portions which can be continuously recorded, the data recording means records the digital data in an unrecorded portion having the smallest recording capacity among the plurality of unrecorded portions. The data recording apparatus according to claim 4, wherein the data recording is performed.