JPH07153196A - Recording and reproducing device for optical disk data - Google Patents

Abstract

PURPOSE:To record/reproduce data of a magneto-optical disk format in/from an optical disk in which a CD-ROM format can be written by discriminating a recording format and recording/reproducing data after conversion processing is performed in accordance with the recording format. CONSTITUTION:A recording format of data is discriminated based on a mode number in a header or existence of a mode number or the like by the combination of an interface 14, a CPU 53, a system controller 26, a CIRC decoder 49 and the like, at the time of recording/reproducing. Successively, after appropriate format conversion processing is performed in accordance with the contents of discriminated recording format, recording/reproducing of data is performed. Therefore, specific data SSDin of a magneto-optical disk format inputted from an input terminal 13 is recorded/reproduced in/from a magneto-optical disk 35 in which a CD-ROM format can be written.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a magneto-optical (MO) disk for recording data (hereinafter referred to simply as data MO
Or called a data MO disc. ) Data and CD-R
It relates to mutual use with OM format data.

[0002]

2. Description of the Related Art Conventionally, for example, there is no format compatibility between a data MO as a rewritable optical disc and a CD-ROM as a read-only optical disc.
It was unthinkable that the data recorded in each of them would be easily transferred to each other.

Here, the concept of mutual entry of data will be described. As shown in FIG. 6, let us consider a state in which the CD-ROM reproducing apparatus 1 and the data MO recording / reproducing apparatus 2 are connected so as to be able to communicate with each other, for example, via a SCSI interface.

In FIG. 6, the data reproduced from the CD-ROM by the CD-ROM drive 4 (CLV system and continuous servo system) under the control of one host computer 3 is stored in, for example, another host computer. The data MO drive 6 (which is a CAV system and a sample servo system) which operates under the control of No. 5 receives and records (writes) in the data MO, and the data MO drive 6 reproduces the recorded data from the data MO. Processing (reading) on the other host computer 5 and vice versa, under the control of the other host computer 5, data MO
The data reproduced from the data MO by the drive 6 is a CD-
One host computer 3 that controls the ROM drive 4
It is possible to perform the processing of reproducing (reading) on the one host computer 3 that is received.

In particular, recently, a CD-R having a large recording capacity
The spread of OM has progressed considerably, and this CD-ROM
In addition to recording the data reproduced from the data MO as described above, a hard disk or a write-once optical disk (WO (write once) type disk, which is a CD-
It is expected that there will be a large demand for the purpose of recording on an R or a CD-WO) and reproducing it, or vice versa.

[0006] Conventionally, in order to cope with such an application, for example, a hard disk whose one sector is 512 bytes has a CD.
When porting ROM data (2352 bytes for one sector), the data in units of 2352 bytes is recorded by a so-called soft sector concept, for example, recording in 5 sectors of a hard disk. I could only do that.

In addition, the data on the hard disk is recorded on the CD-R.
In order to reproduce on the host computer which controls the OM drive, the structure was further complicated. That is, after converting the data on the hard disk and the data on the CD-ROM by an authoring system, the data is once written on a magnetic tape, so-called solid. Next, the solid-written magnetic tape is reproduced by a magnetic tape reproducing machine, a synchronizing signal and a header are added thereto, the header and the data are scrambled, and then EFM-modulated. This EFM
A glass master is laser-exposed with the modulated data, a stamper is created, and a stamping process is performed using this stamper to create a CD-ROM. By reproducing the CD-ROM thus created by the host computer controlling the CD-ROM drive, as a result, the data on the hard disk is recorded on the CD-RO.
It was supposed to be played by M drive.

However, in the conventional technique of porting data according to the soft sector concept described above, a disk created according to the soft sector concept, in the above example, the hard disk, has a long data access time. ,
There is a problem that the use efficiency of the disk, in other words, the usable recording capacity becomes small.

In addition, in the prior art involving the porting of data mediated by a solid magnetic tape, one disk,
For example, it takes a considerable amount of time to reproduce the data on the hard disk on the host computer that controls the CD-ROM drive, and since the device is a large-scale device, it is almost impossible for general users to use. There was a problem.

The inventors of the present application describe a technique for solving such a problem in the specification or the drawing of Japanese Patent Application Laid-Open No. 5-216317 filed by the present applicant. According to this technology,
A CD can be easily electrically driven without the above-mentioned problems.
It becomes possible to record the data recorded in the ROM or the like on the data MO disk or the like.

As described above, the concept of mutual access is such that the CD-ROM reproducing device 1 or the like is connected to the data MO recording / reproducing device 2 or the like, and conversely, the data MO recording / reproducing device 2 or the like is connected to the CD-ROM. There are two cases in which the player can get into the playback device 1, but it is said that mutual getting in is possible even when the player is going in either direction. In this sense, the technique described in Japanese Patent Laid-Open No. 5-216317 is the above-described mutual data loading technique, which enables the data MO recording / reproducing device 2 or the like to enter the CD-ROM reproducing device 1. Can be said.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in connection with such a technique, and is a technique related to the above-described data interleaving technique, for example, data in the data MO format is converted into the CD-ROM format. It is an object of the present invention to provide an optical disk data recording / reproducing apparatus capable of recording and / or reproducing on a writable optical disk.

[0013]

According to the present invention, data recording / reproducing means for recording and / or reproducing data on / from an optical disc and a first recording block unit having a data area other than a sync signal data area are divided. Being the first
Recording format for identifying whether the data is in the second recording format or is in the second recording block having a sync signal data area and a data area other than the sync signal. When recording and / or reproducing on the optical disc, the recording format identifying means identifies whether the data is in the first recording format or the second recording format. After that, the data recording and / or reproducing means records and / or reproduces the data.

According to the present invention configured as described above,
The following configurations are also included.

A. First configuration: The data reproduced by the data reproducing means is received from an external first optical disk (for example, a data MO), and an internal writable second optical disk (for example, CD-
In an optical disk data recording device having a data writing means for writing to a ROM format writable optical disk, the recording format of the first optical disk is divided into first recording block units having a data area other than the sync signal data area. The recording format of the second optical disk is divided into second recording block units having a sync signal data area and a data area other than the sync signal data area. Optical disk data recording device.

B. Second configuration: a first recording format data having a data area other than the sync signal data area and divided into first recording blocks, a sync signal data area, and a data area other than the sync signal In an optical disk data recording device, which is supplied with data in a second recording format divided into two recording blocks and writes the writable optical disk, is the supplied data in the first recording format? An optical disk data recording device comprising: a format identification means for identifying whether or not it is a second recording format; and a data writing means for performing signal processing according to the identified format and writing it on the optical disk. C. Third configuration Data recorded in a first recording format divided into first recording blocks having a data area other than the sync signal data area, or a sync signal data area and a data area other than the sync signal In an optical disk data reproducing apparatus for reproducing data from an optical disk on which data recorded in a second recording format divided by a second recording block having Has and
After the data discriminating means discriminates whether the recording format of the data read from the optical disc by the data reproducing means is the first recording format or the second recording format, the discrimination result format In accordance with the above, the optical disk data reproducing apparatus is characterized in that the data reproducing means performs signal processing of the read data to reproduce the data.

[0017]

According to the present invention, the recording format identification means (this recording format identification means is, for example, in FIG. 1, mainly the interface 14 and the CPU 53 at the time of recording, and mainly at the time of reproduction, the CIRC decoder. 49 and the system controller 26 are applicable),
At the time of recording and / or reproducing, after discriminating between the data in the first recording format and the data in the second recording format, the data recording / reproducing means records and / or reproduces the data. I am trying to do it. Therefore, the first recording block unit having the data area other than the synchronization signal data area is divided into the first recording block units.
A second recording format data, or a sync signal data area and a data area other than the sync signal
It is possible to record and / or reproduce the data on the optical disc in the second recording format divided into the recording block units.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the drawings referred to below,
Components corresponding to those shown in FIG. 6 are designated by the same reference numerals.

FIG. 1 shows the structure of an optical disk drive to which an embodiment of the present invention is applied.

This optical disk drive has three input terminals 11 to 13 and three output terminals 21 to 23.

An analog audio signal SAin is supplied to the input terminal 11. For example, a host computer 3 (see FIG. 6) to which a CD-ROM drive 4 (see FIG. 6) is connected is connected to the input terminal 12, and the host computer 3 and the host computer for the optical disc drive in the example of FIG. 1 are connected. CD-based on a first recording format, which will be described later, via (not shown)
ROM data Din is supplied. In the input terminal 13,
For example, a host computer 5 (see FIG. 6) to which a data MO drive 6 (see FIG. 6) is connected is connected, and the host computer 5 and the host computer (not shown) for the optical disk drive of this FIG. 1 example are connected. Via three different types of data (SSD in 1, S in
Any one data (hereinafter, referred to as specific data) SSDin of SDin2 and SSDin3) is supplied.

An analog audio signal SAout appears at the output terminal 21. The output terminal 22 has a CD-R
The OM data Dout appears. The output terminal 23 has three types of data (SSDin1, SSDin2, Sin) specified above.
SDin3) any one specific data SSD
3 types of specific data (SSDout1,
1 out of SSDout2, SSDout3)
Two specific data SSDout appear.

Digital data input / output terminals 12, 13,
An interface 14 including a SCSI interface, a SCSI controller, a buffer memory, a buffer memory controller and the like is connected to 22 and 23.

The audio signal SAin is converted into digital audio data through the 16-bit A / D converter 15 and supplied to the fixed contact 17b of the switch 17, for example. The CD-ROM data Din is the interface 14
Through the CD-ROM layered ECC encoder 25
After the error correction code is added through the fixed contact 17
is supplied to c. The specific data SSDin is supplied to the fixed contact 17d through the interface 14.

The common contact 17a of the switch 17 is switched by a control signal from the system controller 26. Therefore, the common contact 17a is connected to the input terminal 1
The recording data Drec, which is one of the data corresponding to the signals / data supplied to 1 to 13, is supplied.

The recording data Drec is a well-known CIR.
It is supplied to the magnetic head driver 31 through the C (error correction code) encoder 27 and the EFM encoder 28, and is also supplied to the LD (laser diode) driver 32.

In this case, the output signal of the LD driver 32 is supplied to the optical pickup 33, so that the laser light L from the laser diode LD constituting the optical pickup 33 has an optical path (not shown) and an objective lens. 34
Through a CD-ROM format MO (magneto-optical) disk 35. In addition, the magnetic head driver 3
The output signal of 1 is the recording magnetic head (magnetic overwrite h
ead) 36, the recording magnetic head 36
The magnetic signal from the disk is supplied to the MO disk 35. By the cooperation of the optical pickup 33 and the recording magnetic head 36, a recording (writing) operation is performed on the rotating MO disk 35.

Although the rewritable MO disk 35 is used in this embodiment, the CD-R (C
D-WO), a write-once disc that can be written only once may be used instead.

The MO disk 35 is the spindle motor 4
It is rotated by the CLV (constant linear velocity) method by 1, and its linear velocity is 1.2 to 1.4 m / s. CD in this sense
-It can be said that it corresponds to the ROM format. Therefore, the optical disc drive of the example of FIG. 1 can also reproduce the CD-ROM itself.

In the recording groove of the MO disk 35, a pre-groove meandering at regular intervals is formed in advance over the entire circumference thereof, and at the same time, this pre-groove is modulated by a carrier signal to start from the start point of the disk. An address is formed. It is possible to record based on this address. The data that can be recorded on one MO disk 35 includes audio signals SAin, CD-
It is possible to record any one of the data corresponding to each of the ROM data Din and the specific data SSDin or a combination thereof. Further, it is not limited to the so-called one-stroke writing, and it is also possible to record at a random position based on the above address.

The reflected light of the laser light L emitted from the optical pickup 34 from the MO disk 35 is the objective lens 34.
Then, the light is applied to a photodetector 42 such as a split diode through an optical path (not shown), converted into an electric signal, and supplied to an RF amplifier 43 having a calculation circuit for performing calculations such as addition and subtraction. The intensity of the laser light L at the time of reproduction is made smaller than the intensity of the laser light L at the time of recording.

The focus error signal and the tracking signal from the RF amplifier 43 are supplied to the servo control circuit 44. The servo control circuit 44 creates a focus control signal, a tracking control signal, and a sled control signal based on the reference command data from the system controller 26 and supplies the focus control signal, the tracking control signal, and the sled control signal to the optical pickup 33, and also supplies the motor control signal to the motor driver 45. Is supplied to the spindle motor 41 through.

With such a feedback circuit configuration, known focus, tracking, and sled servo control are performed on the optical pickup 33, respectively.
In addition, speed servo control is performed on the spindle motor 41.

The RF output from the RF amplifier 43
The signal is converted into reproduction data Dread through the well-known EFM decoder 48 and CIRC decoder 49, and is supplied to the common contact 18a of the switch 18. This switch 18
Is also a decode signal of the CIRC decoder 49 (reproduction data D
read) is switched by a control signal from the system controller 26.

When the reproduction data Dread is audio data, the fixed contact 18b and the 16-bit D / A are used.
It is supplied to the output terminal 21 through the converter 51. Also,
When the reproduction data Dread is CD-ROM data, the fixed contact 18c, the CD-ROM layered ECC
It is supplied to the output terminal 22 through the decoder 52 and the interface 14. Further, when the reproduction data Dread is the specific data SSDout, the fixed contact 18d
And the output terminal 23 through the interface 14.

A CPU 53 corresponding to SCSI or the like is connected to the interface 14 so that the contents of data passing through the interface 14 can be specified and the like.
6. The system controller 26 is a CPU
The switches 17 and 1 based on the content specified by 53 and the switching result of the audio / data changeover switch 54 and the content of the data (CIRC decode signal = reproduction data Dread) actually read from the MO disk 35.
8 is automatically switched to an appropriate position. The CPU5
If the content is other than the content specified in 3, switch 17, 1
If the configuration is changed so that 8 is switched to the audio side, the audio / data changeover switch 54 can be omitted.

Next, the operation of the above-described embodiment will be described mainly in relation to mutual loading of data. As mentioned above,
Since the MO disk 35 is in the CD-ROM format, the recording / reproducing operation for the CD-ROM data Din and Dout can be performed without any problem.

The recording / reproducing operation for the audio signals SAin and SAout is also performed on the mini disk (MD:
One frame is 24 bytes in the CLV method, which will be described later.
The same recording / reproducing operation can be performed for a recording block unit (one sector is 98 frames).

However, the specific data SSDin corresponding to the data MO or the like which does not follow the CD-ROM format,
Regarding the recording / reproducing operation with respect to SSDout, as described in the section of the prior art, it is impossible to interleave data as it is. Therefore, description will be given below of enabling the recording / reproducing operation of the data with respect to the MO disk 35 of the CD-ROM format of the specific data SSDin and SSDout.

First, the recording format of the CD-ROM will be described.

FIG. 2A shows the physical format (recording format) of the mode 1 of the CD-ROM, and FIG. 2B shows the CD-RO.
Each of the M format 2 physical formats indicates one recording block unit (one sector in this case).

In mode 1, an error detection code EDC of 4 bytes (hereinafter referred to as B if necessary), an error correction code ECC composed of a parity P (172 bytes) and a parity Q (104 bytes), and these The difference from mode 2 is that there is an 8-byte space that takes all zeros between.

Mode 1 with error correction code ECC etc.
Is used for the purpose of computational work that requires a high reliability, and the mode 2 without error correction / detection code is used for a relatively low demand for the error rate such as image information and audio information. These may be mixed and used in one CD-ROM.

Each recording block (hereinafter, one recording block,
It is called one recording block unit or recording block unit. )
In this case, encoding processing is performed in units of 24 bytes, and 98 frames are accommodated. Therefore, 2352 bytes of data are recorded in one recording block.

As shown in FIG. 2, the head of the above-mentioned 2352 bytes (one recording block), in other words, the top 12 bytes in the reading direction is used as a synchronization signal, and the next 4 bytes are used as a header. The user data is 2048 bytes in mode 1 and 2336 bytes in mode 2. To protect the sync signal, all the remaining data of the sync signal, that is, 2340 bytes, is scrambled by the M sequence. Since it is possible to record different data in units of recording blocks in this 2340 bytes, the header and the other area, in other words, the area other than the sync signal data area are collectively referred to as the data area DR.

After all, the physical format (recording format) of the CD-ROM is 12 per recording block.
It can be said that it is composed of a byte sync signal data area SD and a 2340 byte data area DR other than the sync signal data area SD. The physical format (recording format) of the CD-ROM includes the above-mentioned mode 1.
There is a mode 0 other than the mode 2. In the mode 2, the mode part in the header is the code of the mode 0 and the 2340 bytes of the user data area are all 0 in the mode 2. . Therefore, even in this mode 0, it can be said that one recording block is composed of the synchronization signal data area SD of 12 bytes and the data area DR of 2340 bytes other than the synchronization signal data area SD.

The above explanation is based on the recording format of the CD-ROM (a sync signal data area SD of 12 bytes per one recording block and 2 bytes other than this sync signal data area SD).
First composed of a data area DR of 340 bytes
Recording format).

Next, the recording / reproducing operation will be described for the case where the recording block unit of the specific data SSDin is (1) 2352 bytes, (2) 2340 bytes, and (3) 2336 bytes. .

(1) When the recording block unit of the specific data SSDin is 2352 bytes, that is, the specific data SS
When Din is the specific data SSDin1

FIG. 3 shows the recording format of the specific data SSDin1 supplied to the input terminal 12. In FIG. 3, the data of each byte is data D0, D in the recording direction of the arrow from the upper left to the lower right in the figure.
1, ... D15, D16, ... D2047, UD (UN DEF
INED; undefined), ..., CRC (error detection code) 1,
... CRC8, E (error correction code) 1, 1, ... E1
They are arranged in the order of 6 and 16.

One recording block unit is 2352 bytes (16 bytes × 147 codewords).

In this case, the CD-ROM format M
Since one recording block unit of the recording format of the O disk 35 is also 2352 bytes as shown in FIG.
The 12-byte sync signal and 4-byte header in the D-ROM mode cannot be used together.

Therefore, as shown in FIG. 4, data D recorded in codeword number i = 3 to 130 in FIG.
0 to D2047 are moved to codeword numbers i = 2-129, and the leading 12 of the codeword number i = 130 in FIG.
The same 12-byte sync signal as the recording format of the CD-ROM is inserted in the byte, and the same 4-byte header as in the recording format of the CD-ROM is added to the 16th byte from the 13th byte for recording. A so-called format conversion process is performed for recording. This format conversion processing is performed by the buffer memory in the interface 14, the controller of the buffer memory, and the CPU 53.
It is done in collaboration with.

The sync signal and the header to be inserted in the code word i = 130 are not the data of the mode 0 to the mode 2 of the CD-ROM format, but the sync signal and the header unique to the specific data SSDin. May be inserted. Alternatively, the synchronization signal and the address during sub-coding in the recording format of a general CD (compact disc) may be inserted.

Of course, at the time of reproduction, the interface 14
The synchronization signal and the header inserted in step 3 may be removed and the specific data SSDout1 having the same recording format as the specific data SSDin (see FIG. 3) may be output from the output terminal 22. This processing is also performed by the cooperation of the buffer memory in the interface 14, the controller of the buffer memory, and the CPU 53.

(2) When the recording block unit of the specific data SSDin is 2340 bytes, that is, the specific data SS
When Din is the specific data SSDin2

This recording format is the first 1 in the recording format of the specific data SSDin1 in FIG.
Nothing is recorded in the 2-byte data D0 to data 11, or, for example, all 0s are recorded, and the data E16 from the next data D12 to the last 2352nd byte in FIG. 16 in total 2340 bytes (2352 bytes minus the first 12 bytes)
The information is recorded in the format.

In this case, by the same operation as in FIG.
The data D0 to D2047 recorded in the code word number i = 3 to 130 in FIG. 3 is moved to the code word numbers i = 2 to 129 in FIG. 4, and the top 12 of the code word number i = 130 in FIG. The sync signal of the recording format of the CD-ROM is inserted in the byte, and the header of the recording format of the CD-ROM is added to the 4th byte from the 13th byte to the 16th byte for recording.

As a header to be inserted in the codeword i = 130, a unique (dedicated) header to the specific data SSDin may be inserted. Or
You may make it insert the address in the sub-coding in the recording format of a general CD.

Of course, at the time of reproduction, the interface 14
The synchronization signal and the header inserted in step 2 are removed, and the specific data SSDout2 having the same recording format as the specific data SSDin2 described above may be output from the output terminal 22.

(3) When the recording block unit of the specific data SSDin is 2336 bytes, that is, the specific data SS
When Din is specific data SSDin3

This recording format is a recording format in which the number of codewords is 146, as shown in FIG. One recording block unit is 2336 bytes (1
6 bytes x 146 codewords).

In this case, similarly to FIG. 4, the code word number i = 12 in FIG.
A 16-byte area of codeword number i = 130 is provided in front of 9, and a sync signal of the recording format of the CD-ROM is inserted into the first 12 bytes of the area, and the 16th byte starts from the 16th byte.
The header of the recording format of the CD-ROM may be attached (inserted) to the 4th byte and recorded. However, of the header information, the mode information is
For example, a mode other than modes 0, 1, and 2, for example, mode 3 is recorded so as to be identified.

Of course, at the time of reproduction, the interface 14
The sync signal and the header information inserted in step 3 may be removed and the specific data SSDout3 having the same recording format as the specific data SSDin3 (see FIG. 5) may be output from the output terminal 22.

As described above, according to the above-described embodiment, the interface 14, C can be used at the time of recording and / or reproducing.
Based on the mode number (whether it is mode 1, mode 2, etc., or the presence or absence of mode number) in the header, etc., by the recording format identification means configured by a combination of the PU 53, the system controller 26, the CIRC decoder 49, etc. After identifying the data recording format, the data is recorded and / or reproduced after performing an appropriate format conversion process according to the content of the identified recording format.

Therefore, the recording block unit of the specific data SSDin, which is the data in the second recording format having the data area other than the sync signal data area, is (1) 2
352 bytes, (2) 2340 bytes, and
(3) Recording and / or reproduction processing can be performed in any case of 2336 bytes. Of course, when the identified recording format is the data according to the first recording format having the sync signal data area such as the CD-ROM data Din, the data is recorded on the MO disk 35 without any problem, and (or ) Replay processing can be performed.

Therefore, it is possible to record and / or reproduce the specific data SSDin of the data MO format, which is conventionally incompatible in the recording format, on the writable MO disc 35 of the CD-ROM format. The effect that data can be easily transferred to each other is achieved.

In other words, the effect that the data of another format, for example, the data MO format can be utilized by the MO disk 35 of the CD-ROM format is achieved.

The present invention is not limited to the above-described embodiments, and it goes without saying that various configurations can be adopted without departing from the gist of the present invention.

[0070]

As described above, according to the present invention, the recording format identifying means is the data in the first recording format or the data in the second recording format at the time of recording and / or reproducing. After it is identified, the data recording / reproducing means records and / or reproduces the data. Therefore, data in the first recording format divided in the first recording block unit having a data area other than the sync signal data area, or a sync signal data area and a data area other than the sync signal The effect that the recording and / or reproducing process of the data in the second recording format divided into two recording block units can be performed on the optical disc is achieved.

Specifically, for example, data of the data MO format can be recorded and / or reproduced on a writable optical disc of the CD-ROM format, for example, and format compatibility is achieved. The effect of being able to easily interoperate with data that does not have any is achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc data recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2A is a diagram used for explaining a recording format (mode 1) of a CD-ROM. FIG. 3B is a diagram used for explaining the recording format (mode 2) of the CD-ROM.

FIG. 3 is a diagram provided for explaining a recording format of data MO.

FIG. 4 is a diagram used for explaining the operation of the example of FIG. 1 and for explaining the recording format related to FIG. 3;

5 is a diagram used for explaining the operation of the example of FIG. 1 and used for explaining another recording format related to FIG. 3. FIG.

FIG. 6 is a block diagram provided for explaining a concept of mutual entry of data.

[Explanation of symbols]

 14 Interface 26 System Controller 35 MO Disk 53 CPU Din, Dout CD-ROM Data SSDin, SSDout Specific Data

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location G11B 20/12 9295-5D 27/10 A 8224-5D

Claims (1)

[Claims] 1. A data recording / reproducing device for recording and / or reproducing data on an optical disc, and a first recording format divided into first recording block units having a data area other than a sync signal data area. And a recording format identification means for identifying whether the data is a data according to a second recording format divided into a second recording block unit having a sync signal data area and a data area other than the sync signal. When recording and / or reproducing on an optical disc, the recording format identification means identifies the data according to the first recording format or the data according to the second recording format, and then, Characterized by recording and / or reproducing data by the data recording / reproducing means Optical disk data recording and reproducing apparatus for.