JP3322832B2 - Optical disk recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical disk recording apparatus such as a CD-RW drive for recording data on an optical disk such as a CD-RW capable of re-recording data as a data recording medium.

[0002]

2. Description of the Related Art Data-recordable optical disks such as CD-Rs and optical disks capable of re-recording data such as CD-RWs record data in a recording area in a recording unit called a session. This session includes three areas: a lead-in area, a program area, and a lead-out area.

In the program area, data is recorded in data recording units called tracks or packets. In the lead-in area, the table of contents information (Table Of Contents: TOC) is recorded.

A method of recording data so that a plurality of sessions exist on one optical disk is called a multi-session recording method. In this multi-session recording method, each session is numbered in ascending order from 1, and is referred to as a first session, a second session,....

[0005] The optical disk recording apparatus determines whether or not the (n + 1) th session (n is a positive integer other than 0) exists on the optical disk based on information in the lead-in area of the nth session. are doing.

For example, when reproducing data from an optical disk on which data is recorded in a multi-session system, the first
We will examine the lead-in area sequentially from the session,
Whether or not the (n + 1) th session can exist outside the nth session is determined based on whether or not a flag indicating the existence of the (n + 1) th session is recorded in the lead-in area of the nth session.

If the flag indicating the existence of the (n + 1) -th session is not present in the lead-in area of the n-th session, the presence or absence of the lead-in area of the (n + 1) -th session can be checked. Even if there is a lead-in area in the (n + 1) session, the existence of the (n + 1) -th session is not recognized by the standard, and there is a possibility that data was recorded as not originally present, and the (n + 1) -th session was originally present. There is data that should not be present (for example, see Japanese Patent Application Laid-Open No. Hei 6-349068).
Reference).

That is, if the flag indicating the presence of the next session is recorded in the lead-in area of the nth session on the optical disk, the optical disk recording apparatus determines that the next (n + 1) th session exists. Thus, data can be recorded and reproduced.

When the flag is not recorded in the lead-in area of the n-th session, or when a flag indicating that there is no next session is recorded, the (n + 1) -th session does not exist. Therefore, data cannot be recorded and reproduced.

Therefore, by not recording the flag indicating the presence of the next session in the session of the optical disk (or recording the flag indicating that the next session does not exist), it is possible to make it impossible to add data to the optical disk. .

For example, data write-once optical disks such as CD-Rs are write-once, so once data is recorded in the lead-in area, re-recording (rewriting) cannot be performed thereafter. Therefore, by not recording the flag indicating the next session when recording the lead-in area, or recording the flag indicating that there is no next session, data cannot be additionally recorded thereafter. .

On the other hand, a CD-RW capable of re-recording data
Since the optical disk such as can rewrite data, it is possible to rewrite data by rewriting the lead-in area of the last session even after making the additional recording impossible.

[0013]

However, in the above-mentioned conventional optical disk recording apparatus, it is impossible to additionally write data on an optical disk such as a CD-RW on which data can be re-recorded. There was a problem that additional writing could not be performed again. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to enable data rewriting on a rewritable optical disk in which data cannot be additionally written.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an optical disc recording apparatus for recording and reproducing data in an optical disc on which data can be re-recorded in a multi-session manner. A final session rewriting means is provided for rewriting the content indicating that there is no session next to the session so that the next session exists.

An optical disk capable of re-recording data
Record and play back data in multi-session format for
It is preferable that the optical disc recording apparatus further includes means for rewriting the content indicating that the next session of the last session of the optical disc exists so that the next session does not exist. Further, when the remaining capacity of the recording area of the optical disk is less than one session, a means for inhibiting rewriting of the last session by the last session rewriting means may be provided.

An optical disk recording apparatus according to a first aspect of the present invention records and reproduces data on an optical disk on which data can be re-recorded by a multi-session method, and confirms that there is no session next to the last session of the optical disk. The content shown is rewritten so that the next session exists.

That is, when the flag indicating that the next session does not exist is recorded, the flag is rewritten to the flag indicating that the next session exists. When the flag indicating that the next session exists is not recorded, the next session is recorded. By writing the flag indicating the existence, it is possible to change the non-recordable state of the data re-recordable optical disk to the recordable state again.

Further, the optical disk recording apparatus according to the second aspect of the present invention is applicable to an optical disk capable of re-recording data.
The data is recorded and reproduced by the multi-session method, and the content indicating that the next session of the last session of the optical disc is present is rewritten so that the next session does not exist.

That is, when the flag indicating that the next session exists is recorded, the flag is rewritten to indicate that the next session does not exist, or the flag indicating that the next session exists is rewritten so as not to be recorded. Accordingly, it is possible to make the optical disc on which data can be re-recorded unrecordable from a recordable state.

Further, in the optical disk recording apparatus according to a third aspect of the present invention, when the remaining capacity of the recording area of the optical disk is less than one session, the rewriting of the last session is prohibited. Unnecessary additional recording when there is no area for configuring one session (at least the area for one track configuring the lead-in area, lead-out area, and program area) on a recordable optical disk Can be prevented.

[0021]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 2 is a block diagram showing a configuration of an optical disk recording apparatus according to one embodiment of the present invention.

This optical disk recording apparatus has a CPU, RO
As shown in FIG. 2, a spindle motor (hereinafter, referred to as "motor") 2 for rotating an optical disc 1 capable of re-recording (rewritable) data, such as a CD-RW, is realized by a microcomputer including an M, a RAM, and the like. And an optical pickup 3 on which a semiconductor laser is mounted to irradiate the recording area of the optical disk 1 with laser light L, and the optical pickup 3 is moved in the radial direction of the optical disk 1 in cooperation with a seek motor provided therein. A coarse movement motor 4 is provided.

A rotation control system 5 for controlling the rotation of the motor 2, a coarse motor control system 6 for controlling the drive of the coarse motor 4, an optical pickup control system 7 for controlling the optical pickup 3, A signal processing system 8 for transmitting / receiving a signal of data read by the pickup 3 and a signal of data to be written to a recording area of the optical disc 1;
And a controller 9 for performing control processing according to the present invention together with the control of the processing system 8.

Further, the controller 9 is connected to a host computer via an external interface 10 and sends out data read from the optical disk 1 to the host computer and receives data to be written on the optical disk 1 from the host computer.

Then, the optical pickup 3 is moved in the radial direction of the optical disk 1 while rotating the optical disk 1 by the motor 2, and a laser beam L is irradiated from the semiconductor laser of the optical pickup 3 onto a recording area on the recording surface of the optical disk 1. Then, data recording or reproduction is performed.

That is, the controller 9 or the like includes means for recording and reproducing data in a multi-session format on an optical disc on which data can be re-recorded, and contents indicating that there is no session next to the last session of the optical disc. It functions as a final session rewriting means for rewriting so that the next session exists.

[0027] Also, it functions as a means for rewriting the content indicating that the next session exists after the last session of the optical disk so that the next session does not exist. Further, when the remaining capacity of the recording area of the optical disk is less than one session, the function of the means for prohibiting the last session rewriting means from rewriting the last session is also performed.

FIG. 3 is a diagram showing an example of a data format when the optical disc 1 is in a state where additional recording is impossible in a multi-session. Each of the first to third sessions includes a lead-in area (indicated by “LI” in the figure), a program area (indicated by “P” in the figure), and a lead-out area (indicated by “LO” in the figure). It is composed of

Since the flag 11 indicating that the next session exists is recorded in the lead-in area of each of the first and second sessions, data is recorded for the second and third sessions. However, since the flag indicating that the next session exists is not recorded in the lead-in area of the third session, the fourth session cannot exist, and the data for the fourth session and thereafter cannot be read. Cannot be added.

In this optical disk recording apparatus, under the control of the controller 9, a flag indicating that the next session exists is written in the lead-in area of the third session, so that the fourth session is changed to exist. It is possible to make it possible to additionally write data after the fourth session.

If a flag indicating that the next session does not exist is recorded in the lead-in area, the flag is deleted and changed to indicate that the next session exists, thereby obtaining the fourth session. It is possible to add data after the session.

FIG. 4 is a diagram showing an example of a data format when the optical disc 1 is in a state where additional recording is possible in a multisession. In this case, the flag 11 indicating that the next session exists is recorded in the lead-in area of each of the first to third sessions.
In this state, it is possible to reproduce data for the sessions No. to No. 4 and additionally record data for the fourth session.

In this optical disk recording apparatus, under the control of the controller 9, the flag 11 indicating that the next session recorded in the lead-in area of the third session exists is deleted, or the next session does not exist. Overwriting with a flag indicating that the fourth session does not exist, thereby making it impossible to additionally write data after the fourth session.

FIG. 1 is a flowchart showing a process for changing the state of the optical disk recording apparatus in which data cannot be additionally recorded to a state in which data can be additionally recorded. In this processing, the optical disk can be additionally written by the controller 9 recording a flag indicating that the next session exists in the lead-in area of the last session of the recording area in step (indicated by “S” in the figure) 1 If this is the case, this process ends.

On the other hand, in step 1, it is determined that the optical disk cannot be additionally recorded because the flag indicating that the next session exists is not recorded and the flag indicating that the next session does not exist is recorded. Then, the process proceeds to step 2 where the lead-in area and the lead-out area are re-recorded so as to record a flag indicating that the next session exists in the lead-in area of the last session, and the optical disk is changed to a recordable state. , And this process ends.

In this way, by writing the flag indicating that the next session exists in the lead-in area of the last session of the optical disk 1, it is possible to make the optical disk 1 recordable.

FIG. 5 is a flowchart showing a process for changing the data-recordable state of the optical disk to the data-nonrecordable state in the optical disk recording apparatus. In this process, the controller 9 records in step 11 that the flag indicating that the next session exists in the lead-in area of the last session of the recording area is not recorded, and that the flag indicating that the next session does not exist is recorded. If it is determined that the optical disc cannot be additionally written, the process is terminated.

On the other hand, if it is determined in step 11 that the flag indicating that the next session exists is recorded, it is determined that the optical disk can be additionally recorded.
So that the flag indicating that the next session exists in the lead-in area of the last session will not be recorded.
Alternatively, the lead-in area and the lead-out area are re-recorded so as to record a flag indicating that the next session does not exist, and the optical disc is changed to a state in which additional recording is not possible, and this processing ends.

In this manner, by not writing the flag indicating that the next session exists in the lead-in area of the last session of the optical disk 1, it is possible to make the state where additional recording is impossible.

FIG. 6 is a flowchart showing a process of prohibiting a process of changing to a recordable state when the remaining amount of the data-disabled optical disc in the optical disc recording apparatus is small.

In this processing, the controller 9 determines whether or not the optical disc can be additionally recorded in step 21 as in the above-described processing. If additional recording is possible, this processing ends. And the remaining capacity of the optical disk is 1
It is determined whether or not it is less than the session, and if so, the process proceeds to step 23, where the lead-in area and lead-out area of the last session are re-recorded as described above so that the next session exists, and this processing is performed. Ends, but
If the condition is not satisfied, re-recording for changing to a recordable state is prohibited, and this process ends.

In this way, when the optical disk is changed from a state in which data cannot be additionally recorded to a state in which data can be additionally recorded, and when the remaining storage capacity is small, the process of changing to a state in which data can be additionally recorded is prohibited. Recording can not be performed.

The optical disk recording apparatus according to this embodiment prevents a next session from being present in the last session on a rewritable optical disk on which data is recorded in a multi-session system, that is, the optical disk cannot be additionally recorded. For the optical disc recorded as follows, the lead-in area and lead-out area of the last session are re-recorded and changed to be recordable so that the next session can exist, so that data is again written to the new session. The characteristics of a recordable and rewritable optical disk can be effectively utilized.

An optical disc recorded on a rewritable optical disc on which data has been recorded in a multi-session manner so that the next session can exist in the last session, that is, the optical disc can be additionally recorded. In contrast, by re-recording the lead-in area and lead-out area of the last session so that the next session cannot exist and changing the area to non-recordable, it is not possible to arbitrarily record data on the re-recordable optical Can be made possible.

Further, when the above-mentioned non-recordable state is made recordable, when the remaining capacity of the optical disk is less than one session, a re-recording operation for making the recordable is prohibited. However, useless re-recording such as changing to an optical disk on which data cannot be additionally written can be prevented.

The present invention can be easily applied not only to rewritable optical disks such as CD-RWs but also to other rewritable information media to which the concept of multi-session can be applied.

[0047]

As described above, according to the optical disk recording apparatus of the present invention, a rewritable optical disk in which data cannot be additionally recorded can be recorded again.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a process of changing the state in which data cannot be additionally recorded on an optical disc in the optical disc recording apparatus shown in FIG. 2 to a state in which data can be additionally recorded.

FIG. 2 is a block diagram showing a configuration of an optical disk recording device according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a data format when the optical disc shown in FIG. 2 is in a state where additional recording is impossible in a multi-session.

FIG. 4 is a diagram illustrating an example of a data format when the optical disc illustrated in FIG. 2 is in a state where additional recording is possible in a multisession.

FIG. 5 is a flowchart showing a process in the optical disc recording apparatus shown in FIG. 2 when changing a data recordable state of the optical disc to a data non-recordable state;

FIG. 6 is a flowchart showing a process for prohibiting a process of changing to a recordable state when the remaining amount of the optical disk on which data is not recordable is small in the optical disk recording device shown in FIG. 2;

[Explanation of symbols]

 1: Optical disc on which data can be re-recorded 2: Spindle motor 3: Optical pickup 4: Coarse motor 5: Rotation control system 6: Coarse motor control system 7: Optical pickup control system 8: Signal processing system 9: Controller 10: External interface 11: Flag

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 20/10-20/16 351 G11B ^7/ 00-7/013 G11B 27/00-27/10 G06F 3 / 06 G06F 12/14

Claims (3)

(57) [Claims] 1. An optical disc recording apparatus for recording and reproducing data in a multi-session system on an optical disc on which data can be re-recorded, wherein the next session indicates that there is no session next to the last session of the optical disc. An optical disc recording apparatus, comprising: a last session rewriting means for rewriting as existing. (2)For optical discs on which data can be re-recorded
Record and play back data in multi-session mode
In an optical disk recording device,  There is a session next to the last session of the optical disc
To indicate that the next session does not exist
An optical disc recording device provided with a rewriting means.
Recording device. 3. The optical disk recording apparatus according to claim 1, wherein when the remaining capacity of the recording area of the optical disk is less than one session, a means for inhibiting rewriting of the last session by the last session rewriting means is provided. An optical disk recording device, comprising: