JP2001202621A - Optical disk, method and device for recording and reproduction therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk with which an access operation is not made unstable. SOLUTION: A non-recording area 5 is provided on the outer peripheral side of a recording area 4 on an optical disk 1. Between the recording area 4 and the non-recording area 5 on the optical disk 1, a mark area 6 is provided. In this mark area 6, a recognizing mark area 6d is formed for recognizing the boundary of the recording area 4 and the non-recording area 5. Inside the mark area 6, first and second buffer areas 6b and 6c are respectively provided before and after the recognizing mark area 6d. The width of the first and second buffer areas 6d is set to the width of >=20 tracks and <=100 tracks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk, a recording method thereof, a recording apparatus thereof, a reproducing method thereof and a reproducing apparatus thereof. More specifically, the present invention relates to an optical disk having a recognition mark area behind a recording area, a recording method thereof, a recording apparatus thereof, a reproducing method thereof, and a reproducing apparatus thereof.

[0002]

2. Description of the Related Art An optical disk is a high-density information recording medium using a semiconductor laser, and reproduces information by utilizing a difference in the reflectance of a light beam between a recorded portion and an unrecorded portion.

An optical disc is provided with one or more "recording areas" in which a predetermined information signal is written.
An “unrecorded area” in which a new information signal can be written is provided on the outer peripheral side of the recorded area. In particular, when trying to reproduce an optical disk on which recording has been performed a plurality of times, it is necessary to know the number of recording areas on the disk. That is, it is necessary to detect the "final recording area" of the disk to be reproduced. In order to detect the final recording area of the disc to be reproduced in this way,
It is necessary to repeat the movement of the optical head to sequentially advance the recording area starting from the first recording area. However, it cannot be known whether the next recording area exists unless the optical head is moved to that position, and if the optical head moves to the unrecorded area, servo control cannot be performed and an abnormal state occurs. I fall.

For this reason, in an optical disk reproducing method described in Japanese Patent Laid-Open No. 6-349252, an address of a lead-out area of the recording area is read in a lead-in area at the head of the recording area, and the read-out is performed. Then, the optical head is moved to the next recording area by repeating the jump of one track or a plurality of tracks in the outer circumferential direction, and is moved to the unrecorded area during the jump of one track or the plurality of tracks in the outer circumferential direction. If it is determined that the optical head has reached the position, the optical head is returned to the inner peripheral side without turning on the tracking servo, thereby preventing a servo control from being performed in an unrecorded area and causing an abnormal state. .

However, in the method of reproducing an optical disk described in the above-mentioned publication, it is impossible to avoid that the optical head reaches an unrecorded area when detecting the "final recorded area", and the tracking servo cannot be performed. Since an operation of returning the optical head to the inner peripheral side without turning on is required, there is a problem that the "final recording area" cannot be detected efficiently.

Therefore, recently, immediately after the last data of the recording area, a recognition mark area for recognizing whether or not the subsequent area is unrecorded is provided, and the recognition mark area is determined by the behavior when the recognition mark area is accessed. A technique has been proposed in which the state of an area is detected to determine whether the area after the recognition mark area is an unrecorded area or a recorded area (whether or not the recorded area is the last recorded area). I have.
In this technique, when the recognition mark area cannot be normally accessed, the subsequent area is determined to be an unrecorded area. In this case, when accessing the recognition mark area, first, the lead-in data at the head of the recording area is accessed to determine the address of the lead-out area, and the address of the recognition mark area near the head is accessed. When a new information signal is written in an unrecorded area, a reproducible recording mark that does not cause a data error is recorded in the recognition mark area, and a new information signal is written after the area (new recording area) in which the information signal is newly written. A new recognition mark area is provided.

[0007]

However, in the above-described marking method, if the recognition mark area is provided immediately after the last data in the recording area, there is an access error when accessing the last data in the recording area. However, there is a possibility that the optical head may erroneously jump into the recognition mark area to make the access operation unstable. If the recognition mark area is provided immediately before the unrecorded area, the optical head may enter the unrecorded area when accessing the recognition mark area, causing a servo control failure and an abnormal state. Was. Further, when a subsequent recording area exists, the optical head may jump into the recognition mark area when accessing the first data, and the access operation may be unstable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and does not make the access operation unstable even when accessing the last data in the recording area. An optical disk which does not fall into an abnormal state when accessing the data, and which does not become unstable even when accessing the first data when a subsequent recording area exists, and a recording method therefor. It is an object of the present invention to provide a recording device, a reproducing method thereof, and a reproducing device thereof.

[0009]

In order to achieve the above object, an optical disk according to the present invention has a configuration in which an optical disk capable of recording user data includes a first area in which the user data is recorded and a first area. , A second area provided between the first area and the third area, wherein the second area is an area where the third area is an area in which the user data can be recorded. And a region provided before and after the recognition mark region and having a width of not less than 20 tracks and not more than 100 tracks, respectively.

[0010] The recording method for an optical disc according to the present invention is a recording method for an optical disc capable of recording user data, the recording method comprising: (a) recording the user data; Forming a
(B) forming a second region between the first region and the third region, wherein the step (b) comprises (b-
1) forming a recognition mark area including information indicating whether or not the third area is an area where the user data can be recorded, in the second area; (b-2)
Forming, in the second area, areas each having a width of not less than 20 tracks and not more than 100 tracks before and after the recognition mark area.

[0011] Further, a method of reproducing an optical disk according to the present invention is a method of reproducing an optical disk in which user data is recorded, wherein the optical disk has a first area in which the user data is recorded, and a first area in which the first area is recorded. A second area provided between the second area and the third area, wherein the second area includes information indicating whether the third area is an area where the user data can be recorded. A mark area, and areas provided before and after the recognition mark area, each having a width of 20 tracks or more and 100 tracks or less,
(A) searching the recognition mark area;
(B) detecting the state of the recognition mark area; and (c) determining whether the third area is an area in which the user data can be recorded based on the state of the recognition mark area. Determining step.

A first configuration of the optical disk recording device according to the present invention is an optical disk recording device capable of recording user data, wherein the recording device records the user data, Means for forming one area, and means for forming a second area between the first area and the third area, wherein the means for forming the second area includes the third area in the second area. Means for forming a recognition mark area including information indicating whether or not the area is an area in which the user data can be recorded; and, in the second area, at least 20 tracks before and after the recognition mark area. Means for forming an area having a width of 100 tracks or less.

Further, a first configuration of the optical disk reproducing apparatus according to the present invention is an optical disk reproducing apparatus in which user data is recorded, wherein the optical disk has a first area in which the user data is recorded, A second area provided between the first area and the third area, wherein the second area determines whether the third area is an area in which the user data can be recorded. A recognition mark area including information to be indicated, and areas provided before and after the recognition mark area, each having a width of 20 tracks or more and 100 tracks or less, wherein the playback device searches the recognition mark area; Means for detecting the state of the recognition mark area; and determining whether the third area is an area in which the user data can be recorded, based on the state of the recognition mark area. Characterized in that it comprises a stage.

A second configuration of the optical disk recording apparatus according to the present invention is characterized in that the optical disk according to the present invention is recorded.

Further, a second configuration of the optical disk reproducing apparatus according to the present invention is characterized by reproducing the optical disk of the present invention.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically with reference to embodiments.

FIG. 1 is a block diagram showing the configuration of an optical disk recording / reproducing apparatus according to one embodiment of the present invention, and FIG. 2 is a plan view showing the configuration of the optical disk according to one embodiment of the present invention.

In FIG. 1, 1 is an optical disk, 2 is an optical head, 3 is servo control means, 7 is recording signal control means,
Reference numeral 8 denotes access control means, 9 denotes mark control means, and 10 denotes address detection means. 1 and 2, 1
Is an optical disk, 4 is a recording area where information is recorded, 5 is an unrecorded area, 6 is a mark area, 6b is a first buffer area, 6
c is a second buffer area, and 6d is a recognition mark area.

As shown in FIG. 1, an optical head 2 is arranged near the disk surface of an optical disk 1 rotatable by a motor. The optical head 2 irradiates the optical disc 1 with a light beam spot, reads (reproduces) and writes (records) information on concentric or spiral information recording tracks, and detects servo signals. Further, the servo control means 3 maintains a light beam spot irradiated on the optical disc 1 from the optical head 2 on a designated information recording track by a servo signal from the optical head 2.

The access control means 8 sends the access information to the servo control means 3 based on the address information detected by the address detection means 10 from the information read from the information recording track. The optical head 2 is fed in the radial direction of the optical disk 1 by information from the servo control means 3, thereby accessing a specified information recording track.

An information signal (recording signal) to be written on the optical disk 1 is sent from the recording signal control means 7 to the optical head 2. Then, a light beam spot whose intensity is modulated in accordance with the recording signal is irradiated onto the information recording track of the optical disk 1, and thereby the recording area 4 is recorded on the optical disk 1.
Is formed. The reading of information on the information recording track is performed by irradiating the optical disc 1 with a light beam spot having a different intensity from that at the time of writing the information, and utilizing the fact that the reflectance of the light beam is different between the recorded portion and the unrecorded portion. Done.

After the recording of the recording area 4 is completed, the mark control means 9 sends a recording signal to the optical head 2 through the recording signal control means 7 based on the information from the address detection means 10, thereby providing a first signal. Of the buffer area 6b, the recognition mark area 6d, and the second buffer area 6c.

Here, the width of the first buffer area 6b is set to be equal to or larger than the access error when the last data 4a in the recording area 4 is accessed. For a general playback device,
Since the access error mainly due to the track count error and the accuracy of the brake control is several tens of tracks, the width of the first buffer area 6b is set to about 20 to 100 tracks. This means that the track pitch is 0.8 μm
Corresponds to 16 to 80 μm. Further, the width of the second buffer area 6c is set to be equal to or larger than an access error when the recognition mark area 6d is accessed or a slip amount due to a servo-off. In the case of a general reproducing apparatus, since both the access error and the slip amount are several tens of tracks,
The width of the second buffer area 6c is set to about 20 to 100 tracks. This corresponds to 16 to 80 μm when the track pitch is 0.8 μm. The width of the recognition mark area 6d is preferably 2 tracks or less, more preferably 0.45 to 1.1 tracks.

The recording of the first and second buffer areas (= lead-out areas) 6b and 6c is the same as the method and signal for recording normal data except that information indicating lead-out is recorded. Done by

FIGS. 1 and 2 show a state after the first recording. As shown in FIGS. 1 and 2, on the inner peripheral side of the optical disc 1, following a recording area 4 in which a predetermined information signal is written, a first buffer area 6b, a recognition mark area 6d, and a second Buffer region 6c is recorded. An unrecorded area 5 is provided following the second buffer area 6c. As described above, when the outer peripheral side of the second buffer area 6c is the unrecorded area 5, the recognition mark area 6d
(Approximately one round of the optical disk = approximately 0.8 μm) is in a state where no recording mark exists. The state in which the recording mark does not exist includes the first buffer area 6b, the recognition mark area 6d, and the second buffer area 6d.
This is realized by preventing the laser recording pulse from being emitted from the optical head 2 in a part corresponding to the recognition mark area 6d in a series of recordings following the buffer area 6c.
Then, the reproducing apparatus determines that the recording mark does not exist in the recognition mark area 6d, that the access to the recognition mark area 6d cannot be performed normally, or that the data in the recognition mark area 6d cannot be reproduced. By making the determination, it is determined that the recording area 4 is the final recording area. In this case, whether the recording mark exists in the recognition mark area 6d is determined by the RF output from the optical head 2.
It can be determined by checking the presence or absence of a signal.

An access command to the final data 4a of the recording area 4, the recognition mark area 6d, and the like is sent from the access control means 8 to the servo control means 3. The address information such as the mark area 6 read from the lead-in area 4b in the recording area 4 of the optical disk 1 by the optical head 2 is detected by the address detecting means 10. Further, a command to record the mark area 6 and a command to erase the recognition mark are sent from the access control means 8 to the mark control means 9. The mark control means 9 controls the recording signal control means 7 to control the recording of the mark area 6 and the erasure of the recognition mark based on the information from the access control means 8 and the address detection means 10.

When an unrecorded area 5 exists outside the recording area 4 of the optical disk 1 as shown in FIGS. 1 and 2, a new information signal is written in the unrecorded area 5. Can be. FIG. 5 shows this state, where 11 is a new recording area, 12b is a new first buffer area, 12d is a new recognition mark area, and 12c is a new second buffer area. In this case, the recognition mark area 6d
Is recorded with a reproducible recording mark 6a, a new recording area 11, a new first buffer area 12b, and a new recognition mark in a state where no recording mark exists, following the second buffer area 6c. An area 12d and a new second buffer area 12c are recorded, and at the same time, a reproducible recording mark 6a is recorded in the recognition mark area 6d. Also, a new second
A new unrecorded area 13 is provided following the buffer area 12c. As described above, the playback device has no recording mark in the recognition mark area, cannot access the recognition mark area normally, or
Since the final recording area is determined by determining that the data in the recognition mark area cannot be reproduced,
In this case, the recording area 11 is determined to be the last recording area in place of the recording area 4.

The laminated structure of the optical disc 1 includes a base material, a recording layer and a protective layer, a base material and a protective (dielectric) layer, a recording layer and a protective (dielectric) layer, and a base material and a protective (dielectric). Layers, recording layers, protective (dielectric) layers, reflective layers, etc. The recording layer of the optical disk 1 includes TeOx (0 <x <1), BiTeA
g-based, BiTeAl-based, BiTeAu-based, BiTePd
System, BiSbTe system, BiAsTe system, BiTeSn
System, BiTePt system, GeSbTe system, GeTeSe
, GeTeSn, InSe, etc. phase change recording materials, or cyanine, merocyanine, triphenylmethane, diarylethane, azo, quinone, squarylium, pyrylium, indophenol, etc. Dye materials mainly composed of azulenium, styryl, porphyrin, indigo, thioindigo, oxazine, indanthrene, metal-containing complex, anthraquinone, phthalocyanine, naphthalocyanine, condensed ring, etc. Is used. In this case, generally, elements of Groups III to VI of the periodic table are appropriately added to the phase change recording material, and the dye-based material is used as a property improving material as long as the effectiveness of the main component material is not impaired. , A metal complex, nitrocellulose, an acrylic resin, a polystyrene resin, a urethane resin, a leveling agent, an antifoaming agent, an anti-inflammatory agent, an ultraviolet absorber and the like. Writing information to the optical disk 1 is performed by the optical head 2 as described above.
This is performed by irradiating a light beam spot on the information recording track of FIG. 1 to induce a local thermal change or photochemical change due to light absorption in the recording layer.

Next, the operation of the optical disk recording / reproducing apparatus configured as described above will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of the recording / reproducing apparatus for an optical disk in one embodiment of the present invention, FIG. 4 is an explanatory diagram showing an access state of an optical head in one embodiment of the present invention, and FIG. FIG. 3 is an explanatory diagram showing a recording method on an optical disc in the embodiment.

First, an access command to the lead-in data in the lead-in area 4b of the recording area 4 is sent from the access control means 8 to the servo control means 3, and the information from the servo control means 3 causes the optical head 2 to move the optical disk 1 The optical head 2 accesses the lead-in data in the lead-in area 4b of the recording area 4 (step 101). Thereby, the address information of the recognition mark area 6d corresponding to the recording area is obtained (Step 102). Further, between the last data 4a of the recording area 4 and the recognition mark area 6d, a first buffer area 6b having a width equal to or larger than an access error when accessing the last data 4a of the recording area 4 is provided. Therefore, even if there is an access error when accessing the final data 4a of the recording area 4, the optical head 2 does not jump into the recognition mark area 6d (solid arrow in FIG. 4). The data 4a can be accessed stably.

Next, an access command to the address of the recognition mark area 6 d is sent from the access control means 8 to the servo control means 3, and the optical head 2 is fed in the radial direction of the optical disc 1 by the information from the servo control means 3. ,
The optical head 2 accesses the address of the recognition mark area 6d (step 103). As a result of accessing the address of the recognition mark area 6d, if the servo can be normally accessed without causing a servo disconnection or a data error,
It is determined that "the next recording area exists" (step 10).
4). In this case, the process returns to step 101 to access the lead-in data in the lead-in area of the next recording area, and steps 101 to 103 are repeated. As a result of accessing the address of the recognition mark area 6d, if a data error occurs and normal access is not possible, it is determined that "the recording area is the last recording area" (step 105). That is, it is determined that “the outer peripheral side of the recording area 4 is the unrecorded area 5” (the state of FIG. 5A). In this case, the recognition mark area 6
Since a second buffer area 6c having a width equal to or greater than an access error when the recognition mark area 6d is accessed or a slippage amount of a servo error is provided between the recording mark area 6d and the unrecorded area 5, the recognition mark area 6d is provided. When you access 6d,
Since the optical head 2 does not enter the unrecorded area 5 and the servo is skipped in the recognition mark area 6d, the optical head 2 is redrawn to the unrecorded area 5 (broken arrow in FIG. 4). 3) It is possible to prevent the optical head 2 from entering the unrecorded area 5. As a result, it is possible to prevent the servo control from being performed and falling into an abnormal state. The processing up to this point is common to reproduction-only devices.

If it is determined that the recording area is the last recording area as in step 105, it is further determined whether or not a new information signal is to be written in the unrecorded area 5 (step 106). When it is determined that a new information signal is to be written, a command for erasing the recognition mark is sent from the access control means 8 to the mark control means 9, and the mark control means 9 receives the information from the access control means 8 and the address detection means 10. The erasing control of the recognition mark is performed on the recording signal control means 7 based on the recognition mark, and as shown in FIGS. 5A and 5B, a reproducible recording mark 6a is recorded in the recognition mark area 6d. Is deleted (step 10
7). Next, an information signal to be written in the unrecorded area 5 is sent from the recording signal control means 7 to the optical head 2 and the information signal shown in FIG.
As shown in (b) and (c), an information signal is written in the unrecorded area 5 (a new recorded area 11 including a new lead-in area 11b is provided) (step 108).
Next, a command to record the mark area is sent from the access control means 8 to the mark control means 9, and the mark control means 9 controls the recording control of the mark area based on the information from the access control means 8 and the address detection means 10 by the recording signal control. Means 7
As shown in FIG. 5C, after the new recording area 11, new first and second buffer areas 12b,
12c is recorded, a new recognition mark area 12d in a state where no recording mark exists is formed (step 109), and a new unrecorded area 13 is provided after the second buffer area 12c. If it is determined that a new information signal is not to be written in the unrecorded area 5, the operation ends.

The reproduction of information after the recording of the plurality of recording areas 4 and 11 is completed as described above is performed as follows. That is, first, the optical head 2 is fed in the radial direction of the optical disk 1 by the information from the servo control means 3, and the recognition mark area is searched. Next, a light beam spot having a predetermined intensity is emitted from the optical head 2 onto the recognition mark area, and the state of the recognition mark area is determined. Next, a recording area where recording is completed is specified based on the determination result of the state of the recognition mark area. Then, the optical head 2 irradiates the specified recording area with a light beam spot having a predetermined intensity, thereby reproducing the information in the recording area.

In the above-described embodiment, when the subsequent recording area does not exist, the recognition mark area 6d is set to the state where the recording mark 6a does not exist (the state where the recognition mark exists), and the subsequent recording area does not exist. In this case, the recognizable mark is erased by recording a reproducible recording mark 6a in the recognizable mark area 6d, but the present invention is not necessarily limited to this method. For example, if there is no subsequent recording area, the recognition mark area 6d
A reproducible recording mark 6a is recorded in the recording mark 6a so that the recognition mark does not exist, and when a subsequent recording area exists, the reproducible recording mark can be reproduced by duplicatingly writing arbitrary data in the recognition mark area 6d. 6a may be rewritten to a non-reproducible recording mark. Here, the state where the recognition mark does not exist corresponds to the first buffer area 6.
This is realized by recording the same data in the recognition mark area 6d following b, and subsequently recording the second buffer area 6c. Double writing is performed by overwriting arbitrary data (usually, data obtained by encoding zero). In this case, the playback device determines that the access to the recognition mark area 6d can be normally performed or that the data in the recognition mark area 6d can be played back, so that the recording area 4 becomes the final recording area. Judge that there is.

The operation of the recording / reproducing apparatus for an optical disk in this case will be described below with reference to FIGS. Steps 101 to 103 are the same as those in the above-described embodiment (see FIG. 3), and thus description thereof will be omitted.

When a data error occurs as a result of accessing the address of the recognition mark area 6d and normal access cannot be performed, "the next recording area exists"
Is determined (step 104a). In this case, the process returns to step 101 to access the lead-in data in the lead-in area of the next recording area, and steps 101 to 103 are repeated. As a result of accessing the address of the recognition mark area 6d, if the servo can be normally accessed without any servo departure or data error, it is determined that the recording area is the last recording area (step). 105a). That is, it is determined that “the outer peripheral side of the recording area 4 is the unrecorded area 5” (FIG. 7A).
State).

When it is determined that "the recording area is the last recording area" as in step 105a, it is further determined whether or not a new information signal is to be written in the unrecorded area 5 (step 106a). When it is determined that a new information signal is to be written, a command for marking a recognition mark is sent from the access control means 8 to the mark control means 9, and the mark control means 9 receives the information from the access control means 8 and the address detection means 10. The marking control of the recognition mark is performed to the recording signal control means 7 based on FIG.
As shown in (b), a recording mark 6 which can be reproduced by writing arbitrary data in the recognition mark area 6d.
a is rewritten to a non-reproducible recording mark, and a recognition mark is recorded (step 107a). Next, an information signal to be written to the unrecorded area 5 is sent from the recording signal control means 7 to the optical head 2, and the information signal is written to the unrecorded area 5 as shown in FIGS. 7B and 7C ( A new recording area 11 including a new lead-in area 11b is provided) (Step 108a). Next, a command to record the mark area is sent from the access control means 8 to the mark control means 9, and the mark control means 9 controls the recording control of the mark area based on the information from the access control means 8 and the address detection means 10 by the recording signal control. This is done for the part 7, and FIG.
As shown in (c), after the new recording area 11, new first and second buffer areas 12b and 12c are recorded, and a reproducible recording mark is recorded in the recognition mark area (step 109a). ), A new unrecorded area 13 is provided after the second buffer area 12c. In this case, the reproducing device determines the final recording area by recognizing that the access to the recognition mark area can be normally performed or that the data of the recognition mark area can be reproduced. Therefore, the recording area 11 is determined to be the last recording area in place of the recording area 4. If it is determined that a new information signal is not to be written in the unrecorded area 5, the operation ends.

The reproduction of information after the recording of the plurality of recording areas 4 and 11 is completed as described above is performed as follows. That is, first, the optical head 2 is fed in the radial direction of the optical disk 1 by the information from the servo control means 3, and the recognition mark area is searched. Next, a light beam spot having a predetermined intensity is emitted from the optical head 2 onto the recognition mark area, and the state of the recognition mark area is determined. Next, a recording area where recording is completed is specified based on the determination result of the state of the recognition mark area. Then, the optical head 2 irradiates the specified recording area with a light beam spot having a predetermined intensity, thereby reproducing the information in the recording area.

In the above-described embodiment, the information signal is written in the unrecorded area 5 after the recognition mark is recorded on the information track in the recognition mark area 6d or after the recorded recognition mark is erased. However, the order is not necessarily limited to this order.
After the information signal is written in the information track, the recognition mark may be recorded on the information track in the recognition mark area 6d, or the recorded recognition mark may be erased.

In the above embodiment, the optical disk 1 provided with the single recording area 4 has been described as an example. However, the present invention is not necessarily limited to the optical disk having this configuration. The same effect can be obtained even with an optical disc having a plurality of recordings provided with the above recording area.

Further, in the above-described embodiment, the method of forming an unreproducible recording mark by using the method of double writing arbitrary data in the entire recognition mark area has been described as an example. The present invention is not limited to this. For example, a non-reproducible recording mark may be formed by a method of intermittent overwriting or a method of intermittently erasing a recording mark.

In an erasable recording / reproducing disc, the state of the recognition mark area corresponding to the final recording area,
And three states of the recognition mark area corresponding to the other recording areas: a state where no recording mark is formed, a state where a reproducible recording mark is formed, and a state where a non-reproducible recording mark is formed. Any two of them can be used.

[0043]

As described above, according to the present invention,
The access operation does not become unstable even when accessing the last data of the recording area, the abnormal state does not occur when the recognition mark area is accessed, and the subsequent recording area exists. In such a case, even when the first data is accessed, the access operation does not become unstable.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a configuration of an optical disc in one embodiment of the present invention.

FIG. 3 is a flowchart showing an operation of the optical disc recording / reproducing apparatus according to one embodiment of the present invention;

FIG. 4 is an explanatory diagram showing an access state of the optical head according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a recording method on an optical disc in one embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of another optical disk recording / reproducing apparatus according to an embodiment of the present invention;

FIG. 7 is an explanatory diagram showing a recording method on another optical disc in one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Optical head 3 Servo control means 4 Recording area 5 Unrecorded area 6 Mark area 6b First buffer area 6c Second buffer area 6d Recognition mark area 7 Recording signal control means 8 Access control means 9 Mark control means 10 Address Detecting means 11 New recording area 12b New first buffer area 12c New second buffer area 12d New recognition mark area 13 New unrecorded area

Claims (7)

[Claims] 1. An optical disk capable of recording user data, comprising: a first area on which the user data is recorded; and a second area provided between the first and third areas. The second area, a recognition mark area including information indicating whether the third area is an area in which the user data can be recorded, provided before and after the recognition mark area, An optical disk having an area having a width of not less than 20 tracks and not more than 100 tracks. 2. A recording method for an optical disk capable of recording user data, the recording method comprising: (a) recording the user data to form a first area; Forming a second area between the first area and the third area, the step (b) comprising: (b-1) recording the user data in the second area in the second area; Forming a recognition mark area including information indicating whether or not the recognition mark area is available; and (b-2) 20 tracks or more and 100 tracks in the second area before and after the recognition mark area, respectively. Forming an area having the following width: 3. A method for reproducing an optical disc on which user data is recorded, wherein the optical disc comprises a first disc on which the user data is recorded.
An area, and a second area provided between the first area and the third area, wherein the second area is an area in which the third area can record the user data. A recognition mark area including information indicating whether or not the recognition mark area is provided, and areas provided before and after the recognition mark area, each having a width of 20 tracks or more and 100 tracks or less, (a) searching the recognition mark area; (B) detecting the state of the recognition mark area; and (c) detecting the third state based on the state of the recognition mark area.
Determining whether or not the area is an area where the user data can be recorded. 4. A recording device for an optical disc capable of recording user data, wherein the recording device records the user data and forms a first area; Means for forming a second area between the second area and the area, wherein the means for forming the second area is an area where the third area can record the user data in the second area. Means for forming a recognition mark area including information indicating whether or not the information indicates whether or not the second area has a width of not less than 20 tracks and not more than 100 tracks before and after the recognition mark area. An optical disk recording device, characterized in that: 5. An apparatus for reproducing an optical disk on which user data is recorded, wherein the optical disk comprises a first optical disk on which the user data is recorded.
An area, and a second area provided between the first area and the third area, wherein the second area is an area in which the third area can record the user data. And a recognition mark area including information indicating whether the recognition mark area is provided. The playback apparatus searches for the recognition mark area. Means, means for detecting the state of the recognition mark area, and means for determining whether the third area is an area in which the user data can be recorded based on the state of the recognition mark area. An optical disk reproducing apparatus comprising: 6. An optical disk recording apparatus for recording the optical disk according to claim 1. 7. An optical disk reproducing apparatus for reproducing the optical disk according to claim 1.