JP3384732B2 - Information recording / reproducing device - Google Patents

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 an optical disc such as a CD-R capable of additionally recording information and an optical disc such as a CD-RW capable of recording and erasing information. -It relates to an information recording / reproducing apparatus such as an RW drive apparatus.

[0002]

2. Description of the Related Art Conventionally, an optical disc such as a CD-R capable of additionally recording information, a CD-RW capable of recording and erasing information
C for recording and reproducing information on optical discs such as
There was a D-RW drive.

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

An optical disc in which a plurality of sessions are formed in the recording area is a multi-session disc (Mul).
ti Session Disc). Also, the size of each session is different, and 1 in 1 session.
Individual or multiple 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 circumference side of the optical disc, and table-of-contents information is provided as each track management information in the session. (Tabl
e Of Contents: TOC information) is recorded.

[0006] The TOC information is "track number (track No.)", "track start address", and "next session start address" existing in the session.
It consists of information such as.

Further, the start address of the next session is assigned to one of the formats of the TOC information so that data can be additionally written to the session next to the last session in which the information of the recording area of the optical disc is recorded. It is a pointer to be stored in a different location. By reading this pointer by the CD-RW drive device, the information of the next session can be obtained and the information can be recorded from that session.

[0008] The conventional CD-RW drive device records user information of one or a plurality of tracks in a recording target session at the time of recording information on an optical disc, and then is located on the inner circumference side of the session. The TOC information is recorded in the lead-in area, and the user information recording process for the session ends.

For example, the user information is recorded as a track 1 in the session, the next information is recorded as a track 2, and finally the TO of tracks 1 and 2 is recorded in the lead-in area.
The C information is recorded in the recording division end area (“lead-out (Lea
The recording section end information is recorded in each "d-Out) area", and the recording process to the session ends.

When erasing the user information recorded in the recording area of the optical disc, the user information is overwritten with an erasing pattern so that the user information is virtually erased from the recording area.

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

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

That is, in the 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. It could be regarded as an optical disc on which no information was recorded.

[0014]

However, in the conventional information recording / reproducing apparatus as described above, after the user information is erased on the multi-session disc by the simple erasing method, the second session which is not actually erased is used. There is a problem that the position of the session for recording the next information may not be correctly recognized depending on the TOC information thereafter.

For example, when the size of the first session of the recording area of the optical disc is 100 megabytes (Mbytes), if the user information is erased by the simple erasing method, the simple erasing will be performed even if the information of the second session and thereafter remains. The rest can be regarded as an optical disc on which no information is recorded.

However, 100 megabytes of information having the same capacity as before the erasure is recorded in the first session, and the T
If the start address of the next session is recorded in the OC information, that start address will match the start address of the second session that should have already been erased. Since the TOC information of two sessions is reproduced, the session in which the information should be recorded next is erroneously recognized.

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

[0018]

In order to achieve the above object, the present invention divides a recording area of an optical disc on which information can be recorded and erased into a plurality of sessions, and tracks information for each session in track units. In an information recording / reproducing apparatus that performs recording and reproduction of the information, when information is recorded on an optical disc that has been subjected to a simple erasing process of erasing only the track management information of the session at the beginning of the recording area, the track of the session to be recorded is recorded. After the user information is recorded, the track management information of the session is recorded, and then the track management information of the next session is erased.

Further, when recording the track management information, it is judged whether or not the track management information of the next session is recorded, and only when the track management information of the next session is recorded, the track management information is recorded. Means for erasing information may be provided.

Further, when the track management information of the next session is erased, a predetermined number of blocks located at the beginning and the end of the area in which the track management information of the next session is recorded are reproduced, and the reproduction is performed. It is more preferable to provide means for judging whether or not there is the track management information recorded before the simple erasing process based on the result.

An information recording / reproducing apparatus according to claim 1 of the present invention divides a recording area of an optical disc capable of recording and erasing information into a plurality of sessions, and records and reproduces the information in track units for each session. In the information recording / reproducing apparatus for performing the information recording, when the information is recorded on the optical disc which has been subjected to the simple erasing process for erasing only the track management information of the first session of the recording area, 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 erased.

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

Further, when recording the track management information, the information recording / reproducing apparatus according to claim 2 of the present invention judges whether or not the track management information of the next session is recorded, and the track of the next session is recorded. Only when the management information is recorded, the track management information is erased.

Therefore, when there is no previous track management information in the next session, it is not necessary to perform a wasteful process such as erasing the track management information, and the erasing time can be shortened.

Further, when erasing the track management information of the next session, the information recording / reproducing apparatus according to claim 3 of the present invention is arranged at the beginning and end of the area in which the track management information of the next session is recorded. A predetermined number of blocks respectively located are reproduced, and it is determined based on the reproduction result whether or not the track management information recorded before the simple erasing process exists.

Therefore, the recording position of the track management information of the session next to the session in which the information is recorded after the simple erasing process is deviated from the recording position of the track management information recorded before the simple erasing process. Also, it is possible to surely recognize whether or not the previous track management information is recorded.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing the 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 and a dynamic R.
AM (DRAM) 5, sub code 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 is composed of a decoder 13, a servo 14, and a spindle controller 15, and records and reproduces data on and from the CD-RW disc 16.

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

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

Subcode operation controller 6
Is an LSI for generating subcodes to be recorded on the CD-RW disc 16 and for separating subcodes (SUB P, Q, R, ..., W) read from the CD-RW disc 16. The CD-ROM encoder 7 is a CD-R
It 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
It is an LSI that demodulates reproduced CD-ROM data.
The audio controller 10 reproduces music. The system controller 11 is an LSI that controls recording / reproduction of data to / from the CD-RW disc 16, and performs processing relating to the present invention.

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

The servo 14 is an LSI for controlling servo such as focusing and tracking of laser light of an optical pickup (not shown) for the CD-RW disc 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
Etc., a means for dividing the recording area of an optical disc capable of recording and erasing information into a plurality of sessions, and recording and reproducing information for each session in track units,
When information is recorded on an optical disc that has been subjected to a simple erasing process that erases only the track management information of the first session of the recording area, user information is recorded on the track of the recording target session, and the track management information of the session is recorded. After recording, the track management information of the next session is erased.

When the track management information is recorded, it is judged whether or not the track management information of the next session is recorded, and the track management information is recorded only when the track management information of the next session is recorded. It also serves as a means for erasing information.

Further, when the track management information of the next session is erased, a predetermined number of blocks respectively located at the beginning and the end of the area in which the track management information of the next session is recorded are reproduced, and the reproduction is performed. It also serves as means for determining whether or not there is track management information recorded before the simple erasing process based on the result.

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 circumference 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 division final area ("Lead Out Area (Lead Out Area)").
Area) ") 25).

The lead-in area 23 records the 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 that indicates the end of the session.

The sizes of the lead-in area 23 and the lead-out area 25 are fixed. 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 1 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 time units on the display based on the TOC information.

The program area 26 is an area for recording user information, and is the beginning 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 frame.

FIG. 3 is a diagram showing a format when information is recorded on the CD-RW disc by the Track At Once system. CD-
Track 2 recorded on the recording area of the RW disc 16
Reference numeral 4 includes a pre-gap unit 30, a user data unit 31, and a runout block unit 32.

The pre-gap section 30 is located at the beginning of the track and is a block (Link) block section 3 of one block.
A run-in block unit 34 of 3 and 4 blocks and a gap data (Gap Data) unit 35 are included. The pre-gap section 30 corresponds to a silent section in the case of music data.

The link block section 33 is a block that means a track-to-track joint. The run-in block unit 34 is a block that means the beginning of a track. The user data section 31 is an area for recording user information. The run-out block section 32 is a block which is composed of two blocks and means the end of the track.

Next, the processing of this CD-RW drive will be described. FIG. 4 is a flowchart showing the processing when mounting the CD-RW disc in this CD-RW drive. This process is performed by the user
When the D-RW disc is inserted, the spindle motor is spun up in step 1 (indicated by "S" in the figure) to rotate the CD-RW disc at a predetermined number of revolutions, and the process proceeds to step 2 from the optical pickup. Focusing is performed by irradiating the recording surface of the disc with laser light, and the process proceeds to step 3 where after performing the tracking process of following the laser light from the optical pickup along the track groove of the disc, the track information of the disc is recorded. Etc. to obtain information such as.

In step 4, the lead-in area of the first session is read, and the process proceeds to step 5 to determine whether the TOC information is recorded. If the TOC information is not recorded, the process proceeds to step 13. A 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 is erased, and the process proceeds to step 7. If TOC information is 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, and then step 7
Go to.

At step 7, PMA is read, and then it proceeds to step 8 to judge whether PMA data is recorded. If PMA data is not recorded, step 1
4, the PMA track flag which is a program variable is set to "0" to record that the PMA data of the PMA has been erased, and the routine proceeds to step 10. Also, PMA
If the data is recorded, proceed to step 9 and PMA.
Get track information for the entire disc from step 1
Go to 0.

In step 10, the pre-gap portion of track 1 is read, and the process proceeds to step 11 to determine whether gap data is recorded. If the gap data is not recorded, the process proceeds to step 15 to program variables. , The gap flag is set to “0”, and it is recorded that the gap data in the pre-gap portion is erased.
Go to step 12. If the gap data is recorded, the process directly proceeds to step 12.

In step 12, the TOC track flag, PMA track flag and gap flag are all "0".
It is determined whether or not any of them is "0", and MB (Minimally Blan) which is a program variable.
(k Disc) flag is set to "0", the fact that information has not been erased by the simple erasing process is recorded, and this process ends. If all are "0", it is determined that the information has been erased by the simple erasing process, the MB flag is set to "1", and this process ends.

In this way, the P of the CD-RW disc is
The presence or absence of data at three locations of the MA, the lead-in area of the first session, and the pre-gap portion of the first track is checked to see whether or not information has been erased by the simple erase (Minimally Blank) method. You can

FIG. 5 is a flow chart showing a process for closing a session for a CD-RW disc in this CD-RW drive. This process is CD-
After the user information track is recorded in the session on the RW disc, the session is closed so that the information can be reproduced by another device. At this time, the CD-RW disc is simply erased. When 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 issued from the host computer via the host I / F controller.
When d) is received, the process proceeds to step 22 and TOC information (such as "track start address information""information indicating whether or not additional recording is possible in the next session") in the lead-in area of the session in which the user information is recorded ( (TOC pattern)
Is recorded, and it proceeds to step 23 to judge whether or not there is a write error.

If it is determined in step 23 that there is a write error,
The process proceeds to step 28, an error code is set, the execution of the close session command ends in error, but if there is no write error, the process proceeds to step 24, the lead-out data is recorded in the lead-out area, and the process proceeds to step 25 to write. Determine whether there is an error.

If the judgment in step 25 is a write error,
The process proceeds to step 28, an error code is set, and the execution of the close session command ends in error. However, if there is no write error, the process proceeds to step 26 to judge whether or not the MB flag is set to "1". If it is not set, the process is ended 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 of the lead-in area of the next session, and the process is ended.

In other words, if the MB flag obtained by the above-mentioned mount processing after the user information is recorded in the session of the CD-RW disc indicates that the information is erased by the simple erasing processing, the user information is The TOC information is erased from the lead-in area of the session following the session in which is recorded.

In the data erasing process of the TOC information in the next session, the data is not physically erased from the recording area, but the erase area is recognized by overwriting with a preset erase pattern.

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

Next, in the above-mentioned closed session processing, when the TOC information is not recorded in the lead-in area of the next session, the erasing processing is unnecessary, and for the CD-RW disc subjected to the simple erasing processing. If the TOC information is erased from the lead-in area of the next session every time data is recorded in the session, the processing time is wasted.

Therefore, when the TOC information is not recorded in the lead-in area of the next session during the above-mentioned closed session processing, it is preferable to end the processing without executing the erasing processing.

If the lead-in area of the session next to the session recorded after the simple erasing processing and the old lead-in area before the simple erasing processing are deviated, it is determined whether the TOC information of the old lead-in area is recorded. May not be recognized.

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

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

After erasing the PMA, the lead-in area, and the pre-gap portion by performing a simple erasing process on the information in the format shown in FIG. 7A, as shown in FIG. When a first session having a capacity larger than the size of the first session before erasing is recorded, the position X ′ of the lead-in area of the next session is only Z ′ behind the position Y ′ of the lead-in area before erasing. It will shift.

Therefore, at the time of the above-mentioned closed session processing, the predetermined block at the beginning and the predetermined block at the end of the lead-in area of the next session are reproduced, and the previous TOC is restored.
It is good to judge whether or not the information is recorded.

FIG. 8 is a flow chart showing the 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, and the process proceeds to step 32 and M
It is determined whether or not the B flag is set to "1".

In step 32, the MB flag is "0".
If so, it is recognized that the disc has not been subjected to the simple erasing process, and the close session process is ended. If the MB flag is "1" in the judgment of step 32, it is recognized as a disk which has been subjected to the simple erasing process, and the process proceeds to step 33, where a predetermined number (for example, a predetermined number) at the beginning of the lead-in area of the next session is determined.
The block (5 blocks) is reproduced, and the process proceeds to step 34 to determine whether TOC information is detected.

When the TOC information is detected in the determination in step 34, the process proceeds to step 37 and the erase 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 the process proceeds to step 36 to proceed to the TOC information. It is determined whether or not is detected.

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

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

Thus, during the close session processing, the previous TO is added to 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 can be saved. Further, by recording the session after the simple erasing process, even if the position of the lead-in area of the next session before and after the erasing process is displaced, it is possible to correctly recognize the presence of the TOC information of the next session recorded before the erasing process. .

[0073]

As described above, according to the information recording / reproducing apparatus of the present invention, when the information is recorded again on the multi-session optical disc in which the information in the recording area is erased by the simple erasing method, It is possible to avoid erroneous recognition of the position of the session in which information should be recorded next.

[Brief description of 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.

2 is a diagram showing a multi-session disc format of the CD-RW disc shown in FIG. 1. 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.

4 is a CD in the CD-RW drive shown in FIG.
FIG. 13 is a flowchart showing a process when a RW disc is mounted.

5 is a CD in the CD-RW drive shown in FIG.
FIG. 9 is a flowchart showing a process when closing a session for an RW disc. FIG.

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

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

FIG. 8 is a flowchart showing a TOC information erasing process that executes the erasing process only when TOC information is recorded in the lead-in area of the next session in the CD-RW drive shown in FIG. 1.

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 area 31: User data part 32: Run-out block part 33: Link block part 34: Run-in block part 35: Gap data section

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Claims (3)

(57) [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 for each session in track units. When recording information on an optical disc that has been subjected to a simple erasing process that erases only the track management information of the first session, user information was recorded on the track of the recording target session, and the track management information of that session was recorded. An information recording / reproducing apparatus characterized by further comprising means for erasing the track management information of the next session. 2. The information recording / reproducing apparatus according to claim 1, wherein when the track management information is recorded, it is determined whether or not the track management information of the next session is recorded,
An information recording / reproducing apparatus comprising means for erasing track management information only when track management information for the next session is recorded. 3. The information recording / reproducing apparatus according to claim 2, wherein when the track management information of the next session is erased, the track management information of the next session is located at the beginning and end of an area in which the track management information is recorded. An information recording / reproducing apparatus comprising means for reproducing a predetermined number of blocks and determining whether or not there is track management information recorded before the simple erasing process based on the reproduction result.