JP2004273007A - Optical disk information recording/reproducing device and method for obtaining disk management information thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for obtaining disk management information, which can discriminate the final session, even when the disk management information of write-once optical disk is broken. <P>SOLUTION: In the method for obtaining the disk management information in an optical disk device 500 for recording or reproducing recording information on the optical disk by the irradiation with a laser beam, by moving an optical head over the disk-like optical disk, the disk management information is read out from the disk on which a plurality of sessions can be recorded on the optical disk 100. When the latest disk management information cannot be read out, the disk management information previously recorded is read out so that a part of the latest disk management information incapable of being read out is interpolated by the disk management information previously recorded. Further, the error correction is performed for the disk management information that is read out, and the disk management information immediately before the final session that is securely corrected is obtained. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disc information recording / reproducing apparatus for reproducing record information from a so-called multi-session recording type optical disc capable of recording a plurality of sets of recording information including video and the like in a predetermined unit called a session, In particular, it relates to a method for acquiring disk management information in such an apparatus.
[0002]
[Prior art]
2. Description of the Related Art A multi-session recording type optical disk in which a plurality of sessions can be recorded on the same disk has been widely adopted, particularly, in an optical disk capable of recording a large amount of information. Note that write-once discs such as CD-R and CD-RW (hereinafter, referred to as CD-R / WR) are generally used as such optical discs capable of multi-session recording. DVDs, such as DVD-R and DVD + R, capable of recording a larger amount of information including image information and the like have been widely used.
[0003]
As described above, in a write-once optical disk represented by a CD-R (CR-Recordable), data can be written by a user. However, since it is impossible to rewrite data that has been written once, a new write-once is required. When writing data to a disc, the data is recorded on the disc in a unit called the above-mentioned session, that is, as a session different from a session including already written data.
[0004]
When retrieving the recorded information from such a write-once disc, the optical disc is mounted on the recording / reproducing apparatus. At this time, in general, the data recording state of the information recorded on the disc and usable and the contents thereof are checked. Therefore, an operation called a search is performed. In particular, in a multi-session recording type disc, the above search is performed for a set of data units called a session in the order of recording on the disc.
[0005]
In addition, in the case of so-called multimedia information, including various types of information, including the above-mentioned write-once optical disc, which can be recorded in a large amount and optically read, so-called ECC is used to correct errors due to various causes such as reading. An error correction code is added to the data, thereby enabling the data to be correctly demodulated from the disk. Examples of using such error correction in an optical disk recording / reproducing apparatus include the following Patent Documents 1 to 3.
[0006]
By the way, as described above, in an optical disc of a multi-session recording type in which a plurality of sessions can be recorded on the same disc, when the optical disc is mounted on the recording / reproducing apparatus, the information recorded on the disc and available is recorded. An operation called a search for confirming the data recording state and its contents is performed. At that time, in particular, in the case of a multi-session recording type disc, the above search is performed for a set of data units called a session in the order of recording on the disc.
[0007]
In particular, in a CD-R / RW, a plurality of sessions each including three areas called a lead-in area (I), a data area (D), and a lead-out area (O) are provided on a recording area of a disc. For example, as described in Patent Documents 4 to 6, the information recorded on the disk is divided into the sessions in units of sessions as described above. When the last session is searched, and the last session is searched, the management information (particularly, a subcode called TOC (Table Of Contents) recorded in the lead-in area of each session) is used to record the recorded information. Reading and writing will be performed.
[0008]
[Patent Document 1]
JP-A-8-214104 [Patent Document 2]
Japanese Patent Application Laid-Open No. 7-296531 [Patent Document 3]
JP 2001-168798 A [Patent Document 4]
Japanese Patent Application Laid-Open No. 2002-124068 [Patent Document 5]
JP 2000-285461 A [Patent Document 6]
JP-A-6-349252 [0009]
[Problems to be solved by the invention]
As described above, in the above-described conventional technique, in the write-once optical disc represented by the above-described CD-R or the like, the recording / reproducing operation by the device can be performed by reading the disc management information recorded in the area on the disc. However, if the area for recording the management information of the disc is broken, the disc management information cannot be read, so that the last session required for the recording / playback operation by the device cannot be recognized, and There was a problem of falling into the impossible.
[0010]
Therefore, the present invention solves the above-mentioned problems in the conventional technology, that is, in a case where the disc management information recorded on a write-once multi-session disc represented by a CD-R or the like cannot be read. In this case, the discrimination of the last session recorded on the disc also improves the recognition rate at the time of recording / reproducing such disc, and the optical disc information enables more reliable recording / reproduction of the record information. It is another object of the present invention to provide a recording / reproducing apparatus, and further provide a method for acquiring management information of a multi-session optical disc in such an apparatus.
[0011]
[Means for Solving the Problems]
In the present invention, the management information of the write-once type disc is made only by paying attention to the fact that only part of the previously recorded data is rewritten and added (that is, there are many identical parts). Based on this fact, when the disc management information of the last session cannot be read (even by ECC), the data portion having a high probability of being the same can be interpolated by reading the readable information before that. The main point is to enable the necessary last session disk management information to be corrected by the ECC function.
[0012]
More specifically, according to the present invention, in order to solve the above-described problems, first, an optical head is moved onto a disk-shaped optical disk and irradiated with a laser beam to record or reproduce recorded information on the optical disk. An optical disk information recording / reproducing apparatus, comprising: means for reading disk management information recordable on a predetermined unit of a plurality of pieces of recording information on the optical disk; When the management information cannot be read, an optical disk information recording / reproducing apparatus provided with means for reading and reproducing the disk management information recorded before that is provided.
[0013]
According to the present invention, in the optical disk information recording / reproducing apparatus described above, the disk management information reproducing means interpolates a part of the latest unreadable disk management information by using the previously recorded disk management information. And / or the disc management information reproducing means further comprises means for performing error correction on the read disc management information.
[0014]
Further, according to the present invention, in order to achieve the above object, an optical head is moved onto a disk-shaped optical disk and irradiated with a laser beam to record or reproduce recorded information on the optical disk. In the reproducing apparatus, a method for acquiring disk management information of the optical disk, the method comprising: reading disk management information that can be recorded on the optical disk in a predetermined unit of a plurality of pieces of recording information; Provides a method for obtaining disc management information for reading out and playing back disc management information recorded before that.
[0015]
According to the present invention, in the above-described method for acquiring the disk management information, when the latest disk management information cannot be read, a part of the latest unreadable disk management information is previously recorded. Interpolation is performed by the disk management information, and / or when the latest disk management information cannot be read, error correction is performed on the read disk management information.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First, FIG. 2 of the accompanying drawings shows an optical disc on which information can be additionally recorded / reproduced by an optical disc information recording / reproducing apparatus (so-called drive) according to an embodiment of the present invention, that is, a CD-R / RW, The external appearances of DVD-R, DVD + R, etc. are shown. As shown in this figure, generally, in such a multi-session write-once optical disc, data starts at an inner peripheral portion 110 of a disc-shaped disc 100 and moves toward an outer peripheral portion 120 of the disc 100 in a predetermined form called a session. Recorded in units.
[0017]
However, among the above optical disks, in particular, in the case of a disk called DVD + R, an area (block) in which session position information, which is a part of the management information of the disk, is recorded in the inner peripheral portion 110 of the disk 100. Is provided, and a plurality of pieces of information in a predetermined unit called the above-mentioned session can be recorded on the outer periphery 120 thereof.
[0018]
Next, the format of a multi-session recorded on an optical disc called CD-R / RW is composed of a PMA area, a first session, a second session, etc., from the inner circumference side of the disc. Each session includes a lead-in area (LI), a program area (PGM), and a lead-out area (LO), as shown in FIG. Then, TOC (Table Of Contents) as disc management information can be additionally written at a predetermined position in the lead-in area (LI).
[0019]
On the other hand, in a DVD disc called DVD + R, information of a predetermined unit called a session recordable on the DVD is generally represented by a block called TOC (Tn: where n is a natural number) as shown in FIG. Area) is provided on the inner peripheral portion 110 of the disk 100 (see FIG. 2). Each of the plurality of sessions recorded on the outer peripheral portion 120 includes a lead-in, an intro (In: n is a natural number), a data zone (DZn: n is a natural number), and a closure (Cn: n Is a region (block) called a natural number.
[0020]
Further, in this DVD + R, in the TOC block of the inner peripheral portion 110 of the disc, session position information (ie, start / end addresses of each session) which is a part of the management information is written every time each session is closed. Is added as needed, one block at a time. That is, in a DVD + R multi-session disc, disc management information called a TOC block is collected and arranged in a predetermined area of the disc, that is, in the inner peripheral portion of the disc, and the block immediately before the unrecorded section is arranged. Is the effective TOC.
[0021]
FIG. 5 attached hereto shows more detailed configuration contents of blocks (areas) constituting each session in the DVD + R. First, the lead-in area is provided with an initial zone, an inner disc identification zone, a buffer zone, control data, and a buffer zone. Further, Buffer Zone, SIZ and control data are sequentially provided in the intro area, and Buffer Zone and SIZ are provided in the closure area. That is, control data (DCB: Disc Control Block) which is disc management information is written in each session, and the start / end addresses in the session to which it belongs (however, in the case of lead-in, (Start / end address of session # 1). Although not shown here, the configuration (track configuration) of the final session (open) is written in the SIZ of the intro of the final session, and unless this SIZ is read, the drive cannot record on the disc. . Therefore, in order to read this SIZ, recognition of the above-mentioned last session is necessary and important.
[0022]
The search operation in the DVD + R having such a configuration will be briefly described with reference to FIG. 5 described above. When a disk is mounted on the apparatus, first, the head is moved to the disk inner peripheral portion 110 to search for the TOC block. By searching the TOC block, the position (address) of the last session is confirmed, the head is moved to the position of the last session, and the SIZ is read from the control data in the lead-in or intro (see the arrow in the figure). On the other hand, when the TOC block is destroyed and cannot be read, the control data is read from the lead-in of session # 1, the address of the next session is confirmed, and the head is moved to that position to control the intro. The data is further moved to the next session, and this is repeated to reach the final session. The configuration (track configuration) of the final session (open) written in the SIZ of the intro of the final session is read, and the apparatus reproduces / records the data. Operation becomes possible.
[0023]
Next, the schematic configuration and operation of an optical disk device (hereinafter simply referred to as a drive) as an information recording / reproducing device according to an embodiment of the present invention will be described with reference to the block diagram of FIG. Will be described.
[0024]
In FIG. 6, a higher-level device 400 is, for example, a higher-level device of a so-called optical disk device 500 constituted by a host computer or the like. The command issued from the host device 400 is received by the interface controller 502 constituting the optical disk device 500 and transmitted to the microprocessor 504. The microprocessor 504 has a control memory 505 which is a high-speed IC memory. The control memory 505 stores a so-called micro program code that operates on the microprocessor 504.
[0025]
Here, when the instruction issued from the host device 400 is a recording request, the microprocessor 504 operates to transfer the recording request data from the host device 501 to the buffer memory 503 via the interface controller 502. I do.
[0026]
Next, the microprocessor 504 of the optical disk device 500 instructs the recording circuit 506 to perform encoding, and the recording circuit 506 performs recording request data encoding processing on the buffer memory 503. Then, the microprocessor 504 instructs the recording circuit 506 to record the encoded data at a predetermined position on the optical disc medium 100, and the recording circuit 506 sends the data to the optical disc medium 100 via the optical head 508. Is recorded at a predetermined position.
[0027]
If the command issued from the host device 400 is a reproduction request, the microprocessor 504 instructs the reproduction circuit 507 to reproduce data from a predetermined position on the optical disc medium 301. On the other hand, the reproducing circuit 507 stores data reproduced from a predetermined position on the optical disc medium 100 via the optical head 508 in the buffer memory 503. Then, when there is an error in the reproduced data, the reproduction circuit 507 performs error correction. Next, the microprocessor 504 performs an operation of transferring the reproduction data from the buffer memory 503 to the host device 400 via the interface controller 502. The above operation is the same as the operation of a general drive. In addition, the movement of the optical head on the optical disk can be performed by the microprocessor 504 via, for example, a servo circuit or a feed mechanism (not shown), which is the same as the operation of a general drive. .
[0028]
Next, a method of acquiring disc management information in the optical disc apparatus (drive) according to an embodiment of the present invention, in particular, in the multi-session optical disc will be described in detail with reference to the flowchart of FIG. explain.
[0029]
In the following description, disc management information recorded on the disc is represented by a symbol M. The disc management information M is, for example, TOC information additionally recorded at a predetermined position in the lead-in area (LI) of each recorded session in the write-once CD-R / RW. On the other hand, in the DVD + R, the TOC information in the TOC block of the inner peripheral portion 110 of the disk or the control data DCB additionally written in the lead-in area or intro area of each session corresponds.
[0030]
In the flowchart of the disk management information read processing shown in FIG. 1, first, an unrecorded search of the disk management information area is performed (step S11), and subsequently, an effective disk immediately before the unrecorded portion (that is, the last session) is obtained. The management information (block) is read (step S12). In particular, since the data of the DVD is scrambled, a descrambling process is performed here (step S13).
[0031]
Thereafter, it is determined whether or not reading of the latest valid disk management information is OK (step S14). As a result, if the valid disk management information can be read ("Y (es)" in the figure), the disk management information reading process is normally terminated.
[0032]
On the other hand, for example, when the TOC block in the lead-in area or the inner peripheral portion of the disk is damaged and thus cannot be corrected by the ECC (ECC cannot be corrected: “N (o)” in FIG. The block is read (step S15). Here, for the same reason as described above, descrambling is also performed on the data of the read block (step S16).
[0033]
Thereafter, it is again determined whether the reading of the valid disk management information of the immediately preceding block is OK (step S17). As a result, if the reading of the disk management information of the immediately preceding block is also not ECC-correctable (“N (o)” in the figure), the process proceeds to step S15, and thereby the immediately preceding block is read. Read the block. However, even in this case, if the first block cannot be read, the processing is abnormally terminated.
[0034]
Next, in step S17, if "Y", that is, the new disk management information immediately before the unrecorded portion (final session) could not be read, but the previous (old) disk management information could be read, Performs the interpolation by copying the same data portion of the old management information (B) read in step S16 to the valid management information (A) not read in step S12 (step S18). At this time, the identity of the data between the new disk management information (A) and the old management information (B) is determined based on whether or not the parts should be the same according to the standard. Is possible. Thereafter, the interpolated data is re-scrambled (step S19), and ECC correction is performed (step S20).
[0035]
Thereafter, the scrambled data is descrambled (step S21), and it is determined whether or not the correction is OK (step S22). As a result, if it is determined in step S22 that the ECC correction is successful (“Y” in the figure), the descrambled data can be used as valid management information, but the ECC cannot be corrected (“N” in the figure). If it is determined that the disk management information cannot be read, the process ends abnormally.
[0036]
The above-described acquisition of the disc management information is performed by the microprocessor 504 in the configuration shown in FIG. 6 according to the contents of the micro program code recorded in the control memory 505.
[0037]
Hereinafter, the principle of the above-described method for acquiring disk management information according to the present invention will be described in more detail.
[0038]
That is, as shown in the attached FIG. 7, in a write-once disc, once recorded data cannot be rewritten, data is frequently updated. In particular, the management information of the disk is added as a new data block each time data is updated (added), so that the last block (immediately before the unrecorded portion) of the disk management information area is the only effective management information. Information (M4 in FIG. 7). An example of the contents of the disc management information recorded in each of the blocks M1 to M4 is shown at the bottom of the drawing. As will be understood from this, the updating (additional writing) of each data is performed immediately before that. This is performed by writing new update data in addition to the update data written in the block. (For example, in updating M2, "update data 2" is added to "header data" and "update data 1" of M1 and recorded.)
[0039]
Therefore, when reading the disk management information as described above, first, an unrecorded search of the management information area is performed, and the block immediately before the unrecorded portion is read (M4 in FIG. 7).
[0040]
However, at this time, as shown in the attached FIG. 8, if the block (M4) immediately before the unrecorded block could not be read out due to ECC error correction, according to the present invention, the block (M4) immediately before that block (M4) was used. Read M3). As described above, in this management information, the position and amount of update data each time it is updated once are clear according to the standard (however, the content of the data to be updated is undefined). Therefore, the data of the part that is not updated (in FIG. 8, the “header data”, “update data 1”, “update data 2”, and “update data 3” of M4) are valid blocks (the original undestructed data). This should be the same for the block M4) and the immediately preceding block (M3).
[0041]
Therefore, according to the present invention, the data of the part which is not updated in the standard is interpolated by copying the data of the immediately preceding block. That is, as shown on the right side of the figure, most of the destroyed data (“header data” to “update data 3” of M4) is reproduced by this interpolation. Then, the ECC correction is performed again in the interpolated state, and as a result, if the correction is successful, the data obtained by the correction is used as effective management information. That is, the ability of ECC usually employed in write-once discs including CD-R / RW, DVD-R, DVD + R, etc., is limited when the destroyed data amount is smaller than the data amount of the entire block. , Can expect enough. Therefore, since the data amount of the disk management information to be updated is usually smaller than the data amount of the entire block as described above (that is, a part of “update data 4” in FIG. 8), the update is not performed. If the data in the portion (“header data” to “update data 3”) is correct, the data at the updated location (“update data 4”) can be sufficiently corrected by ECC even if it is broken. It should be noted that the correction code of the ECC uses a valid block, so that data of an old block is not erroneously corrected.
[0042]
According to the use of the disc management information reproduced as described above, the optical disc apparatus, which is an information recording / reproducing apparatus for recording / reproducing information from / on such a disc, stores necessary disc management information. Even when a block (area) is destroyed and cannot be read, valid disk management information (block) immediately before an unrecorded portion (that is, the last session) can be correctly read. As a result, the SIZ of the intro of the last session can be read. Can be read, thereby improving the recognition rate at the time of recording / reproducing a disc, and enabling more reliable recording / reproducing of recorded information.
[0043]
【The invention's effect】
As described in detail above, according to the optical disk information recording / reproducing apparatus and the method for acquiring the disk management information of the present invention, when the block (area) in which the disk management information is recorded is destroyed and cannot be read, Also, it is possible to correctly read valid disc management information immediately before an unrecorded portion (final session), thereby improving the recognition rate when recording / reproducing a disc, and more reliably recording / reproducing recorded information. The effect is excellent.
[Brief description of the drawings]
FIG. 1 is a flowchart illustrating a method for acquiring disc management information in an optical disc information recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a multi-session recording type disc on which information can be additionally recorded / reproduced by the optical disc information recording / reproducing apparatus.
FIG. 3 is a diagram showing an example of a multi-session format configuration called CD-R / RW, which is a kind of the multi-session recording type disc.
FIG. 4 is a diagram showing an example of a format configuration of a multi-session called DVD + R, which is a kind of the multi-session recording type disc.
FIG. 5 is a diagram illustrating the block arrangement on a multi-session recording type DVD disk called DVD + R.
FIG. 6 is a block diagram showing a schematic configuration of an optical disk information recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 7 is an explanatory diagram for explaining a method of acquiring disc management information in the optical disc information recording / reproducing apparatus of the present invention.
FIG. 8 is also an explanatory diagram for explaining a method of acquiring disc management information in the optical disc information recording / reproducing apparatus of the present invention.
[Explanation of symbols]
100 optical disk (DVD + R)
110 Inner circumference 120 Recording area 500 Optical disc device 504 Microprocessor 505 Control memory 508 Optical head.

Claims (6)

An optical disk information recording / reproducing apparatus for moving an optical head onto a disk-shaped optical disk and irradiating a laser beam to record or reproduce recording information on the optical disk, comprising a plurality of predetermined units of recording information on the optical disk Means for reading the disc management information recordable by the control unit. Further, when the latest disc management information cannot be read, the disc management information reading means reads the disc management information recorded before that. An optical disk information recording / reproducing apparatus, comprising: means for reproducing information. 2. The optical disk information recording / reproducing apparatus according to claim 1, wherein the disk management information reproducing unit includes a unit that interpolates a part of the latest unreadable disk management information by using the previously recorded disk management information. An optical disk information recording / reproducing apparatus characterized by comprising: 3. The optical disc information recording / reproducing apparatus according to claim 1, wherein said disc management information reproducing means further comprises means for performing error correction on the read disc management information. Optical disk information recording / reproducing device. An optical disc information recording / reproducing apparatus that moves an optical head onto a disc-shaped optical disc and irradiates a laser beam to record or reproduce record information on the optical disc, a method for acquiring disc management information of the optical disc, A plurality of pieces of record information are read from the optical disc in a predetermined unit. If the latest disc management information cannot be read, the previously recorded disc management information is read and reproduced. A method for obtaining disk management information. 5. The disk management information acquisition method according to claim 4, wherein when the latest disk management information is unreadable, a part of the unreadable latest disk management information is stored in the previously recorded disk management information. A method for acquiring disk management information, wherein the method comprises: 6. The disk management information acquisition method according to claim 4, wherein when the latest disk management information cannot be read, error correction is performed on the read disk management information. How to get information.

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