JPH11185447A - Information recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the misrecognition of the position of a session to be recorded next when information is recorded again on a multisession optical disc from which information in its recording region is erased by a simple erasing method. SOLUTION: After a system controller 11 records user information on the track of the recording object session of a CD-RW disc 16 and the track management information of the session is recorded, the system controller 11 checks whether a simple erasing method by which only the track management information of the session of the leading end of a recording region is erased is applied to the disc or not and, if it is applied, erases the track management information of the next session.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD for recording and reproducing information on and from an optical disc such as a CD-R capable of additionally recording information and a CD-RW capable of recording and erasing information. The present invention relates to an information recording / reproducing device such as a RW drive device.

[0002]

2. Description of the Related Art Conventionally, an optical disk such as a CD-R capable of additionally recording information, and a CD-RW capable of recording and erasing information
C that records and reproduces information on optical disks such as
There was a D-RW drive device.

This CD-RW drive device divides the recording area of the optical disk as described above into a plurality of recording sections (each recording section is referred to as a "session"), and a series of data blocks is provided during each session. User information is recorded in units (each data block is referred to as a “track”).

Incidentally, an optical disk having a plurality of sessions formed in a recording area is transferred to a multi-session disk (Mul
ti Session Disc). Also, the size of each session is different, and one session contains one
One or a plurality of tracks can be recorded.

In each session, a track management information area (referred to as a "lead-in area") is formed in a head area located on the inner peripheral side of the optical disc, and the table of contents information is used as each track management information in the session. (Tabl
e Of Contents (TOC information).

The TOC information includes “track number (track No.)”, “start address of track”, “start address of next session” existing in the session.
Etc.

[0007] Further, the head address of the next session is allocated to one of the formats of the TOC information so that data can be added to the next session after the last session in which the information of the recording area of the optical disk is recorded. The CD-RW drive obtains the information of the next session by reading this pointer, and can record the information from the session.

[0008] A conventional CD-RW drive device records one or more tracks of user information for a recording target session when recording information on an optical disc, and thereafter is located on the inner peripheral side of the session. The TOC information is recorded in the lead-in area, and the user information recording processing for the session ends.

For example, the user information is recorded as track 1 in the session, the next information is recorded as track 2, and finally the TO information of tracks 1 and 2 is recorded in the lead-in area.
C information in the recording section end area (“Lead-out (Lea
d-Out) area), the recording section end information is recorded respectively, and the recording processing for the session is ended.

When erasing the user information recorded in the recording area of the optical disk, the user information is overwritten with an erasure pattern, thereby erasing the user information from the recording area in a pseudo manner.

The erasing method of the user information includes user information recorded on the optical disc, TOC information of track management information of all sessions, and an intermediate recording area (Program).
There are a complete erase (All Blank) method for erasing all information recorded in the memory area (PMA) and a simple erase (Minimary Blank) method for erasing only the PMA and the TOC information of the first session. The PMA is an area for temporarily storing TOC information such as a start address and an end address of a track.

FIG. 9 is a diagram showing an example of a recording format before and after erasing user information by the simple erasing method. According to the simple erase method, the erase pattern is overwritten on each of the PMA, lead-in area, and pre-gap area shown in (a), and as shown in (b), the PMA, lead-in area, and pre-gap area are overwritten. The user information is pseudo-erased while leaving the information of the other areas of each area (shaded area in the figure).

That is, in a conventional information recording / reproducing apparatus,
When the user information is erased from the multi-session disc by the simple erasing method, only the TOC information of the first session is erased, and the TOC information of the second and subsequent sessions remains without being erased. Could be regarded as an optical disk on which no information was recorded.

[0014]

However, in the conventional information recording / reproducing apparatus as described above, after the user information is erased from the multi-session disc by the simple erasing method, the second session which is not actually erased is deleted. There is a problem that the subsequent TOC information may make it impossible to correctly recognize the position of the session in which information is to be recorded next.

For example, when the size of the first session of the recording area of the optical disk is 100 megabytes (Mbyte), if the user information is erased by the simple erasure method, even if the information after the second session remains as it is, the simple erasure is performed. Thereafter, it can be regarded as an optical disk on which no information is recorded.

However, for the first session, 100 megabytes of information having the same capacity as before the erasure is recorded, and its T
If the start address of the next session is recorded in the OC information, the start address matches the start address of the second session that should have been erased, and the next time this optical disc is inserted, the first address that should have been erased Since two sessions of TOC information are reproduced, a session in which information is to be recorded next is erroneously recognized.

The present invention has been made in view of the above points, and when information is recorded again on a multi-session optical disc in which information in a recording area has been erased by a simple erasure method, the next information is recorded. It is an object to avoid erroneous recognition of the position of a session to be performed.

[0018]

In order to achieve the above object, the present invention divides a recording area of an optical disk on which information can be recorded and erased into a plurality of sessions, and divides each session into information on a track basis. In an information recording / reproducing apparatus that performs recording and reproduction of information, when information is recorded on an optical disk on which a simple erasure process for erasing only the track management information of the first session of the recording area is performed, the information is recorded on the track of the session to be recorded. After recording the user information and recording the track management information of the session, there is provided means for erasing the track management information of the next session.

When recording the track management information, it is determined whether or not the track management information for the next session is recorded. Only when the track management information for the next session is recorded, the track management information is recorded. Means for executing information erasure may be provided.

Further, when erasing the track management information of the next session, a predetermined number of blocks located at the beginning and the end of the area where the track management information is recorded are reproduced, and based on the reproduction result. It is more preferable to provide a means for determining whether or not the track management information recorded before the simple erasure processing exists.

According to a first aspect of the present invention, an information recording / reproducing apparatus divides a recording area of an optical disk on which information can be recorded and erased into a plurality of sessions, and records and reproduces information for each session in track units. When information is recorded on an optical disc that has been subjected to a simple erasure process of erasing only the track management information of the first session of the recording area in the information recording / reproducing apparatus performing the recording, the user information is recorded on the track of the recording target session. Then, after recording the track management information of the session, the track management information of the next session is deleted.

Therefore, after erasing the information in the recording area by the simple erasure method, each time information is recorded in the session, the previous track management information remaining in the next session is erased, so that the next session is deleted. Next, it can be determined that the session should record information, and user information can be recorded in that session.

Further, the information recording / reproducing apparatus according to a second aspect of the present invention, when recording the track management information, determines whether or not the track management information of the next session is recorded, and determines the track of the next session. Only when the management information is recorded, the track management information is deleted.

Therefore, when the previous track management information does not remain in the next session, unnecessary processing such as erasing the track management information is not required, and the erasing time can be reduced.

Further, in the information recording / reproducing apparatus according to the third aspect of the present invention, when erasing the track management information of the next session, predetermined information located at the beginning and end of the area where the track management information is recorded, respectively. A number of blocks are reproduced, and based on the reproduction result, it is determined whether or not the track management information recorded before the simple erasure processing exists.

Therefore, the recording position of the track management information of the session following the session in which the information was recorded after the simple erasure process was performed is shifted from the recording position of the track management information recorded before the simple erasure process was performed. Also, it is possible to reliably recognize whether or not the previous track management information is recorded.

[0027]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a CD-RW drive which is an embodiment of the information recording / reproducing apparatus of the present invention.

This CD-RW drive comprises a CPU 1, a flash ROM 2, a host interface (I / F) controller 3, a buffer manager 4, a dynamic R
AM (DRAM) 5, subcode operation controller 6, CD-ROM encoder 7, SRAM 8, C
D-ROM decoder 9, audio controller 10,
System controller 11, CD encoder 12, CD
It comprises a decoder 13, a servo 14, and a spindle controller 15, and records and reproduces data on and from a CD-RW disc 16.

The CPU 1 is a central processing unit (microcomputer) for controlling the operation of the entire CD-RW drive. The flash ROM 2 is a nonvolatile memory that can be erased and rewritten by the CPU 1. The host interface controller 3 controls communication between a host computer (not shown) and the CD-RW drive.
SI.

The buffer manager 4 is an LSI that controls the transfer of transfer data from the host computer and data read from the CD-RW disk 16. The dynamic RAM 5 is a buffer memory for temporarily storing transfer data from the host computer and data read from the CD-RW disk 16.

Subcode operation controller 6
Is an LSI for generating subcodes to be recorded on the CD-RW disc 16 and separating subcodes (SUBP, Q, R,..., W) read from the CD-RW disc 16. The CD-ROM encoder 7 uses a CD-R
This is an LSI that modulates OM data before writing it on the CD-RW disc 16.

The SRAM 8 is a memory for storing data such as program variables. The CD-ROM decoder 9
This is an LSI for demodulating the reproduced CD-ROM data.
The audio controller 10 plays music. The system controller 11 is an LSI that controls recording and reproduction of data on the CD-RW disk 16 and performs processing according to the present invention.

The CD encoder 12 is an LSI that modulates user data and subcodes so as to conform to a media standard before writing data to the CD-RW disc 16.
The CD decoder 13 is an LSI that separates data read from the CD-RW disk 16 into user data and subcodes and demodulates the data.

The servo 14 is an LSI for controlling servo such as focusing and tracking of laser light of an optical pickup (not shown) on the CD-RW disk 16. The spindle (motor) controller 15 is a CD-
This is an LSI that controls the rotation of a spindle motor (not shown) that rotates the RW disk 16.

That is, the system controller 11
Means for dividing a recording area of an optical disc capable of recording and erasing information into a plurality of sessions, and recording and reproducing information in track units for each session;
When recording information on an optical disc that has been subjected to a simple erasure process that erases only the track management information of the first session in the recording area, user information is recorded on the track of the session to be recorded, and the track management information of that session is recorded. After recording, the function of the means for erasing the track management information of the next session is performed.

When recording the track management information, it is determined whether or not the track management information of the next session is recorded. Only when the track management information of the next session is recorded, the track management information is recorded. It also functions as a means for executing information erasure.

Further, when erasing the track management information of the next session, a predetermined number of blocks located at the beginning and end of the area where the track management information is recorded are reproduced, and based on the reproduction result. It also serves as a means for determining whether or not the track management information recorded before the simple erase processing exists.

FIG. 2 is a diagram showing a multi-session disc format of a CD-RW disc. The recording area includes a PCA 20 for calibrating the recording power from the inner peripheral side, a program memory area (PMA) 21 for recording track information, and a plurality of sessions 22. Each session 22 is a first session, a second session,... From the beginning, and the size of each session is random, and varies depending on the number of tracks and the size of the tracks in each session.

The session 22 includes a track management information area (referred to as “Lead In Area”) 23, one or more tracks 24, and a recording section final area (“Lead Out Area (Lead Out Area)”).
Area) ”).

The lead-in area 23 records table of contents information (TOC information) in the subcode Q. The track 24 is an area for recording user information such as arbitrary file data and music data, and is a data group composed of at least 300 data blocks. Lead-out area 25
Is an area indicating the end of the session.

The sizes of the lead-in area 23 and the lead-out area 25 are determined. For example, the lead-in area of the first session is about 2 minutes and 30 seconds, and the lead-out area is about 1 minute and 30 seconds. . The lead-in area of the second session is about one minute, and the lead-out area is about 30 seconds.

In the lead-in area 23, TOC information of track information management data is recorded.
The track information in the session 22 can be obtained based on the C information. For example, when the user information is music data, the total number of tracks and the length of each track can be displayed in units of time on the display based on the TOC information.

The program area 26 is an area for recording user information, and is the start of the program area 26 from the first track (track 1) of the first session.
The start start address is 0 minutes 0 seconds 0 frames.

FIG. 3 is a diagram showing a format when information is recorded on a CD-RW disc by a track-at-once (Track At Once) method. CD-
Track 2 recorded on the recording area of the RW disc 16
4 includes a pre-gap (Pre Gap) section 30, a user data section 31, and a run-out block section 32.

The pre-gap section 30 is located at the head of the track, and is a block (link) block section 3 of one block.
It comprises a run-in block section 34 of 3 blocks, 4 blocks, and a gap data (Gap Data) section 35. The pre-gap portion 30 corresponds to a silent portion in the case of music data.

The link block section 33 is a block representing a joint between tracks. The run-in block section 34 is a block indicating the head of the track. The user data section 31 is an area for recording user information. The run-out block section 32 is a block consisting of two blocks, which means the end of the track.

Next, the processing of the CD-RW drive will be described. FIG. 4 is a flowchart showing processing when a CD-RW disc is mounted in the CD-RW drive. This processing is performed by the user
When the D-RW disc is inserted, the spindle motor is spun up in step (indicated by "S" in the figure) 1 to rotate the CD-RW disc at a predetermined rotation speed, and the process proceeds to step 2 where the optical pickup is used. The laser beam is irradiated on the recording surface of the disk to perform a focus process, and the process proceeds to step 3 to perform a tracking process for following a laser beam from an optical pickup along a track groove of the disk, and then to execute a track process on the disk. And the like to obtain information such as information.

In step 4, the lead-in area of the first session is read, and the flow advances to step 5 to determine whether or not TOC information has been recorded. If TOC information has not been recorded, the flow advances to step 13. The TOC track flag, which is a program variable, is set to "0" to record that the TOC information in the lead-in area of the first session has been erased. If the TOC information has been recorded in the lead-in area of the first session, the process proceeds to step 6 to acquire the track information and the start address (start address) of the next session.
Proceed to.

At step 7, the PMA is read. At step 8, it is determined whether PMA data is recorded. If PMA data is not recorded, step 1 is executed.
The program proceeds to step 4, sets the PMA track flag, which is a program variable, to "0", records that the PMA data of the PMA has been erased, and proceeds to step 10. Also, PMA
If data has been recorded, go to step 9
From the track information of the entire disc from step 1
Go to 0.

In step 10, the pre-gap portion of track 1 is read, and the flow advances to step 11 to determine whether gap data has been recorded. If no gap data has been recorded, the flow advances to step 15 to move to the program variable Is set to “0” to record that the gap data in the pre-gap portion has been erased,
Proceed to step 12. If the gap data has been recorded, the process directly proceeds to step S12.

In step 12, the TOC track flag, PMA track flag, and gap flag are all "0".
It is determined whether any one of them is not “0”, and the program variable MB (Minimally Blank) is determined.
(k Disc) flag is set to “0” to record that information has not been erased by the simple erasure process, and this process ends. If all are "0", the MB flag is set to "1" assuming that the information has been erased by the simple erase process, and this process is terminated.

In this way, the CD-RW disc P
MA, checking the presence / absence of data at three locations: the lead-in area of the first session, and the pre-gap portion of the first track, to check whether or not information has been erased by the Minimally Blank method. Can be.

FIG. 5 is a flowchart showing a process for closing a session on a CD-RW disc in the CD-RW drive. This process is performed on CD-
After recording the user information track in the session on the RW disc, the session is closed to enable the information to be reproduced by another device. In this process, the CD-RW disc is simply erased. If the information has been erased by the processing, the TOC information of the next session is erased.

In step 21, a close session command (Close Session Command) is sent from the host computer via the host I / F controller.
Upon receipt of d), the process proceeds to step 22 where TOC information such as "track start address information" and "information indicating whether or not to allow additional recording in the next session" is stored in the lead-in area of the session in which the user information is recorded. TOC pattern)
Is recorded, and the flow advances to step 23 to determine whether or not a write error has occurred.

If a write error is determined in step 23,
Proceed to step 28 to set an error code and terminate the execution of the close session command with an error. If not a write error, proceed to step 24 to record lead-out data in the lead-out area and proceed to step 25 to write Determine whether there is an error.

If a write error is determined in step 25,
Proceeding to step 28, an error code is set, and execution of the close session command is terminated with an error. If it is not a write error, the flow proceeds to step 26 to determine whether the MB flag is set to "1". If it is not set, the process is terminated as it is, but if it is not set, the process proceeds to step 27 to execute the data erasing process of the TOC information in the lead-in area of the next session, and ends this process.

That is, after the user information is recorded in the session of the CD-RW disc, if the MB flag obtained by the above-described mounting processing indicates that the information has been deleted by the simple deletion processing, the user information The TOC information is deleted from the lead-in area of the session next to the session in which is recorded.

In the data erasure processing of the TOC information in the next session, the data is not physically erased from the recording area, but is recognized as an erasure area by overwriting a preset erasure pattern.

In this manner, C that has been subjected to the simple erasure process
Even if the TOC information before the erasure remains on the D-RW disc, the TOC information is erased when the information is recorded, so that it is possible to avoid erroneous recognition of the track of the session in which the information is to be recorded next.

Next, in the above-described close session processing, when TOC information is not recorded in the lead-in area of the next session, the erasing processing is unnecessary. If the TOC information is deleted from the lead-in area of the next session every time data is recorded in the session, processing time is wasted.

Therefore, when the TOC information is not recorded in the lead-in area of the next session during the above-described closed session processing, the processing may be terminated without executing the erasing processing.

If the lead-in area of the session following the session recorded after the simple erasure processing is shifted from the old lead-in area before the simple erasure processing, whether the TOC information of the old lead-in area is recorded or not is determined. May not be recognized.

FIGS. 6 and 7 are recording format diagrams showing an example in which the old lead-in before erasing the user information and the new lead-in area after erasing are shifted by the simple erasing process.

For example, after performing a simple erasing process on the information in the format shown in FIG. 6A to erase the PMA, the lead-in area, and the pre-gap portion, as shown in FIG. When a first session having a capacity smaller than the size of the first session before the erasure is recorded, the position X of the lead-in area of the next session is shifted by only Z on the first session side from the position Y of the lead-in area before the erasure. It shifts.

Further, the information in the format shown in FIG. 7A is subjected to a simple erasing process to erase the PMA, the lead-in area, and the pre-gap portion. Then, as shown in FIG. When a first session having a capacity larger than the size of the first session before erasure is recorded, the position X 'of the lead-in area of the next session is shifted Z' behind the position Y 'of the lead-in area before erasure. It shifts.

Therefore, at the time of the above-mentioned closed session processing, the first predetermined block and the last predetermined block of the lead-in area of the next session are reproduced, and the previous TOC is read.
It is good to judge whether information is recorded.

FIG. 8 is a flowchart showing a TOC information erasing process for executing the erasing process only when the TOC information is recorded in the lead-in area of the next session. In this process, when the session in which the user information is recorded is closed, the erasure flag of the program variable is set to “0” in step 31 to clear it.
It is determined whether the B flag is set to "1".

The MB flag is set to "0" in the judgment of step 32
If so, it recognizes that the disc has not been subjected to the simple erasure process, and ends the close session process. If the MB flag is "1" in the determination at step 32, the disk is recognized as having undergone the simple erasure process, and the routine proceeds to step 33, where a predetermined number of heads of the lead-in area of the next session (for example,
(5 blocks) is reproduced, and the routine proceeds to step 34, where it is determined whether or not the TOC information is detected.

If the TOC information is detected in the step 34, the process proceeds to a step 37, where the erasure flag is set to "1". If the TOC information is not detected in the determination in step 34, the process proceeds to step 35 to reproduce the last predetermined number (for example, 5 blocks) of the lead-in area of the next session, and proceeds to step 36 to execute the TOC information. It is determined whether or not is detected.

If the TOC information is not detected in the judgment in step 36, it is judged that the user information is recorded, and this processing ends. When the TOC information is detected in the determination at step 36, the process proceeds to step 37 to set the erasure flag to "1", and proceeds to step 38 to determine whether the erasure flag is set to "1".

At the judgment of step 38, the erase flag is set to "1".
If is not set (when the erasure flag is "0"), this process is terminated. If it is set, the process proceeds to step 39, where the preset erasure pattern is overwritten in the lead-in area of the next session. Then, a process of erasing the previous TOC information recorded in the lead-in area is executed, and this process ends.

As described above, during the close session processing, the previous TO is stored in the lead-in area of the next session.
When the C information is not recorded, the erasing process is not performed, so that unnecessary processing time is not consumed. Further, by recording the session after the simple erasure process, even if the position of the lead-in area of the next session before and after the erasure process is shifted, the existence of the TOC information of the next session recorded before the erasure process can be correctly recognized. .

[0073]

As described above, according to the information recording / reproducing apparatus according to the present invention, when information is recorded again on a multi-session optical disc in which information in a recording area has been erased by the simple erasure method, Then, it is possible to avoid erroneous recognition of the position of the session where information is to be recorded.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a CD-RW drive which is an embodiment of an information recording / reproducing apparatus of the present invention.

FIG. 2 is a diagram showing a multi-session disc format of the CD-RW disc shown in FIG.

FIG. 3 is a diagram showing a format when information is recorded on the CD-RW disc shown in FIG. 1 by a track-at-once method.

FIG. 4 is a CD in the CD-RW drive shown in FIG.
It is a flowchart which shows the process at the time of mounting -RW disk.

FIG. 5 is a CD in the CD-RW drive shown in FIG.
It is a flowchart which shows the process at the time of closing a session with respect to -RW disc.

FIG. 6 is a diagram of a recording format showing an example in which an old lead-in before erasing user information in a simple erasing process and a new lead-in area after erasing are shifted.

FIG. 7 is a diagram of a recording format showing an example of a shift different from FIG. 6;

FIG. 8 is a flowchart showing a TOC information erasing process for executing the erasing process only when the TOC information is recorded in the lead-in area of the next session in the CD-RW drive shown in FIG.

FIG. 9 is a diagram showing an example of a recording format before and after erasing user information by a simple erasing method in a conventional information recording / reproducing apparatus.

[Explanation of symbols]

 1: CPU 2: Flash ROM 3: Host I / F controller 4: Buffer manager 5: DRAM 6: Subcode operation controller 7: CD-ROM encoder 8: SRAM 9: CD-ROM decoder 10: Audio controller 11: System controller 12: CD encoder 13: CD decoder 14: Servo 15: Spindle controller 16: CD-RW disc 20: PCA 21: PMA 22: Session 23: Lead-in area 24: Track 25: Lead-out area 30: Pre-gap part 31: User data section 32: run-out block section 33: link block section 34: run-in block section 35: gap data section

Claims (3)

[Claims] 1. An information recording / reproducing apparatus which divides a recording area of an optical disk capable of recording and erasing information into a plurality of sessions and records and reproduces information on a track basis for each session. When recording information on an optical disc that has been subjected to a simple erasure process for erasing only the track management information of the first session, user information is recorded on the track of the recording target session, and the track management information of that session is recorded. An information recording / reproducing apparatus further comprising means for erasing track management information for a next session. 2. The information recording / reproducing apparatus according to claim 1, wherein when the track management information is recorded, it is determined whether track management information of a next session is recorded,
An information recording / reproducing apparatus comprising means for executing erasure of track management information only when track management information of a next session is recorded. 3. The information recording / reproducing apparatus according to claim 2, wherein when erasing track management information of the next session, a predetermined number of tracks respectively located at the beginning and end of an area where the track management information is recorded. Play the block,
An information recording / reproducing apparatus comprising: means for determining whether or not track management information recorded before the simple erasure processing exists based on the reproduction result.