JP2004303381A - Recording method of optical disk, and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize error processing by retry and alternation processing realized conventionally in an optical disk being able to overwrite, and a write-in system in which recorded data receiving from the high order device is arranged at an arbitrary position on the disk independently of a non-record part and a recorded part, with a write-once optical disk such as a CD-R and a DVD-R in which increasing capacity is performed remarkably and being spread widely as recording media in which overwriting cannot be performed physically. <P>SOLUTION: When digital data is recorded in an optical disk having a physical address at a recordable part and being not able to overwrite, the recordable part of the optical disk is divided into a read-in region a user region, and a read-out region using the physical address, an information region including a pointer for a list table for controlling a logic address allotted to a whole user region is provided in one part of the read-in region, in a list table for controlling the logic address, the logic address and a list indicating correspondence for the physical address in the user region are arranged together. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an information recording technique for recording information on an information recording medium.
[0002]
[Prior art]
As an example of an information recording system, an example of a conventional optical recording system will be described with reference to FIGS. FIG. 3 shows a block diagram of a conventional optical recording / reproducing apparatus. Light emitted from a laser light source 25 (a wavelength of about 660 nm for DVD-RAM), which is a part of the head 2, is collimated into a substantially parallel light beam 22 through a collimator lens 24. The light beam 22 is irradiated onto the optical disk 11 through an objective lens 23 to form a spot 21, and then guided to a servo detector 26 and a signal detector 27 through a beam splitter 28 and a hologram element 29. Signals from the respective detectors are subjected to addition / subtraction processing to become servo signals such as a tracking error signal and a focus error signal, which are input to a servo circuit. The servo circuit controls the positions of the driving means 31 of the objective lens 23 and the entire optical head 2 based on the obtained tracking error signal and focus error signal, and positions the position of the light spot 21 in a target recording / reproducing area. The added signal of the detector 27 is input to the signal reproduction block 41. The input signal is digitized after being filtered and frequency equalized by a signal processing circuit. The digitized digital signal is processed by an address detection circuit and a demodulation circuit. The microprocessor calculates the position of the light spot 21 on the optical disk 11 based on the address signal detected by the address detection circuit, and controls the automatic position control means so that the optical head 2 and the light spot 21 can be recorded in a desired recording unit. Positioning in the area (sector).
[0003]
When the instruction from the higher-level device to the optical recording / reproducing device is for recording, the microprocessor receives the recording data from the higher-level device and stores it in the memory, and controls the automatic position control means so that the light spot 21 can be used for the target recording. Position to the location of the area. After confirming from the address signal from the signal reproducing block 41 that the light spot 21 has been properly positioned in the recording area, the microprocessor controls the laser driver or the like to record the data in the memory in the target recording area. .
[0004]
Since the address signal is arranged for each information recording unit area as shown in FIG. 6 and is arranged at the head of the recording unit area, the position of the light spot immediately before recording is detected by detecting the address signal. Can be confirmed.
[0005]
FIG. 5 shows an example of an operation flow of an optical recording system that drives a DVD-RAM disc defined as an international standard ISO / IEC-16824, which is a rewritable DVD, as an example of the above-described optical recording system. It is.
[0006]
When a disc is inserted or the power of the optical recording system is turned on, first, the optical recording system performs processing for determining the type of the medium. Usually, in addition to a DVD-RAM medium, it has a reproduction function of a CD-ROM or a DVD-ROM which is a reproduction-only medium. Therefore, the optical recording system first performs a process of determining the type of the medium, and determines which of the above media the above-mentioned medium is. The manner of the discrimination processing differs depending on each system. For example, some systems determine the type of a medium from the analog characteristics of a reproduction signal such as a reflectance and a focus error signal. Other systems reproduce a medium physical information holding area provided on a disk substrate and then read the medium (contents) based on the contents (data). In some cases, the type is determined.
[0007]
When the optical recording system recognizes that the type of the medium is a rewritable type, that is, a DVD-RAM, first, it checks the recorded contents such as a defect management information area to check whether the optical disk has been physically formatted. If the physical format has not been performed, the process waits until there is a physical format instruction from a higher-level device or a user.
[0008]
When the optical disk has been physically formatted, the optical recording system waits for an instruction from a user or a higher-level device after performing recording preparation processing such as calibration processing and logical consistency verification. Upon receiving any command, the optical recording system checks the type of the command, and performs a recording process if the command is a recording command. In the case of a command such as reproduction, format, or removal of a disc, corresponding processing is performed. Normally, these processes are completed normally. However, if recording fails for an unexpected reason, error processing such as retry or replacement processing is performed.
[0009]
In the case of a normal DVD-RAM, at the time of this recording processing, whether or not the recording data has been normally recorded is actually reproduced and confirmed, and if necessary, replacement processing using another recording unit area is performed. , Increasing the reliability of the recorded data. Management information on the reallocation of the recording area by the replacement process is recorded in a special area (defect management area) on the recording medium.
[0010]
Thus, DVD-RAM is a very reliable optical recording system.
[0011]
Further, in an information recording / reproducing apparatus that treats a rewritable information recording medium such as a DVD-RAM as an information recording medium that can be recorded only once, a plurality of recorded sector flag areas provided in an area other than the user information area of the medium are provided. Means for recording an unrecorded sector by indicating the recorded or unrecorded state of each sector in the user information area of the information recording medium by the state of the plurality of flags. For example, see Patent Document 1). When receiving an instruction to record user information from a higher-level device, the information recording / reproducing apparatus reads the information in the written sector flag area of the information recording medium, and confirms that all the sectors in the recording instruction range have not been recorded. After that, recording on the information recording medium is performed. Means for preventing overwriting in a recorded sector by using the above method has been used.
[0012]
In addition, when using an information recording medium that can be recorded only once, when recording, the user information is continuously recorded from the beginning to the end of the user information area on an information recording medium that has never been recorded. After that, after the information recording medium is removed from the information recording / reproducing apparatus, a method called the Disc At Once method in which the user information is not recorded again is generally used.
[0013]
[Patent Document 1]
JP-A-4-3368 (page 1)
[0014]
[Problems to be solved by the invention]
As described above, in an optical disk that can be overwritten conventionally, error processing by retry or replacement processing or recording data received from a higher-level device is arranged at an arbitrary position on the disk regardless of an unrecorded part or a recorded part. A writing method has been realized. However, in recent years, the capacity has been steadily increased, and these functions are considered in an optical disk (write-once optical disk) that is physically impossible to overwrite, such as a CD-R or a DVD-R, which is most widely used as a recording medium. Not. The object of the present invention is not to limit the method of use of the medium to an overwritable optical disk without changing the hardware or physical specifications, that is, the recording data received from the higher-level device is stored at an arbitrary position on the disk. An object of the present invention is to provide a safe optical recording system in which there is no fear of destroying recorded information or losing recorded information despite the arrangement.
[0015]
[Means for Solving the Problems]
To solve the problem, when recording digital data on a non-overwritable optical disc having a physical address in the recordable part, the recordable part of the optical disc is read-in area, user area, lead-out area using the physical address. An information area including a pointer to a list table for managing a logical address allocated to the entire user area is provided in a part of the lead-in area, and the logical address management list table is provided in the logical address and the user area. Method of arranging a list showing correspondence to physical addresses of the optical discs '' or `` When recording digital data on a non-overwritable optical disc having a physical address in the recordable part, using the physical address Divided into a lead-in area, spare area, user area, and lead-out area, An information area including a pointer to a list table for managing a logical address allocated to the entire user area and a pointer to a list table for managing a spare area is provided in a part of the area. A list showing the correspondence between the logical address and the physical address in the user area is arranged and arranged in the user area, and the spare area management list table stores the physical address in the user area and the physical address in the spare area. When reproducing digital data from a recordable optical disc, the logical address of the logical address management list table and the physical address in the user area are recorded by the "method of arranging lists indicating correspondence and arranging them in the lead-in area". A method for reproducing data on an optical disk while using correspondence to addresses It is used.
[0016]
Further, in order to play back an optical disk recorded by such a recording method with an optical disk reproducing device and a recording / reproducing device, “the logical address of the logical address management list table arranged on the optical disk and the physical address in the user area are changed. When reading data at a certain logical address described in the logical address management list table after reading the corresponding list, the data is read from the physical address in the user area corresponding to the logical address in the logical address management list table. " Such means are used.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
FIG. 2 shows an arrangement of data on an optical disk used for explaining the present invention. Here, the present invention will be described based on the data arrangement of FIG. 2, but the essence of the present invention does not depend on the data arrangement.
[0019]
FIG. 2 is a sectional view of the radius of the optical disk. Therefore, in the optical disk used in the following description, a spare area, a user area, and a lead-out used as a replacement area of the user area due to a defect management header, a lead-in having a defect management table, a defect, and the like are arranged from the inner circumference to the outer circumference of the disk. Also, a logical address (LBA) is provided in an area freely accessible from the host, and this address is associated only with the user area. Therefore, the size generally recognized by the host as the recording capacity of the disk is equal to the size of the user area. Generally, the disk recording capacity takes a certain value after initialization, and the used area and the free area in the user data are used. Is equal to the capacity of the recording area.
[0020]
Next, with reference to FIG. 4, a description will be given of a general process performed when a defect occurs, which has been performed on an overwritable optical disk such as a DVD-RAM.
[0021]
In response to a command “record data (N) in LBA (n)” from the host, the drive records data (N) at a physical address (PBA (a)) in the user area corresponding to LBA (n). . Then, the drive reads the data (N) recorded in the user area again from the disk, compares it with the data (N) received from the host, or includes the data (N) in the reproduced data by using the parity for error correction attached to the data. Check the number of errors. At this time, if the number of errors included in the reproduced data satisfies the defect recognition condition (usually specified by the number of errors) specified by the drive, the PBA on which the data is recorded is handled as a defect. If the PBA (a) corresponding to the LBA (n) is defective, the position of the defect management table to be referred to is first checked from the defect management header arranged in the lead-in. Next, a PBA that can be newly used as a defect replacement area in the spare area is searched from the defect management table indicated by the defect management header. The data (N) requested by the host is written again in the defect replacement area determined in this way, and the recorded data is reproduced and the defect qualification conditions are checked as in the work performed in the user area. If it is determined that there is no need to treat the PBA (a) in the user area corresponding to the LBA (n), the PBA (b) in the spare area has been replaced. In order to indicate that PBA (b) in the area corresponds, "there is a defect in PBA (a)" and "PBA (b) is used instead of PBA (a)" in the defect management table. "Or that the physical address corresponding to LBA (n) is PBA (b)." Finally, as the information and position of the defect management table are updated, the information of the defect management table included in the defect management header is also updated.
[0022]
Therefore, the defect management performed on the optical disk is configured such that the number of LBAs, that is, the recording capacity is not changed even when a defect occurs during use of the disk by providing a spare area as a defect replacement dedicated area.
[0023]
The above is the defect management method conventionally performed on the rewritable optical disk. Performing the defect determination by performing reproduction after recording in this manner is called read-after-write (RAW). This defect determination is performed not only in the RAW mode but also in the normal playback mode using the number of errors included in data detected during the error correction processing.
[0024]
FIG. 7 is a diagram showing an arrangement of the defect management header and the defect management table included in FIG. Here, the defect management header is arranged in the defect management header area, and the defect management table is arranged in the defect management table area. Further, in each area, the defect management header and the defect management table are recorded so as to be added from one direction to the other in the area, and when the header and the table reach the end of the area, the head of the area is returned again. And updates the data while overwriting the previously recorded data. In such a usage, a problem occurs in which the latest defect management header and the defect management table are unknown, and therefore, the defect management header includes a counter value that is counted up each time an update is performed, and a PBA. Is provided. As a result, first, the drive arbitrarily reads out the defect management header in the defect management header area, compares the counter values contained in each of them, and finds the defect management header having the maximum counter value. Further, the latest defect management table corresponding to the defect management header is determined by reading using the defect management table pointer in the defect management header. In this way, the drive can find out the defect management information written on the optical disk and manage it again.
[0025]
Next, a recording sequence in a rewritable optical disk such as a DVD-RAM will be briefly described.
[0026]
FIG. 8 is a diagram showing a sequence in a case where a recording command comes from a host to a free area of an overwritable optical disk. In response to a recording command including an LBA indicating a recording area from the host, the drive records data requested by the host in a PBA corresponding to the LBA indicated by the host.
[0027]
FIG. 9 is a diagram showing a sequence in a case where a recording command is sent from the host to a used area of the overwritable optical disk. In response to a recording command including an LBA indicating a recording area from the host, the drive records data requested by the host in a recorded PBA corresponding to the LBA indicated by the host. This is because, in an actual system, all information relating to data recorded and arranged on the user area on the optical disk is managed by the host except for defect management. Normally, the host has, as a part of recording data, information as to how data is arranged in the user area using the LBA as a file list. When a new file is added, the file list contains the information. Management is performed such that information data corresponding to the added file is added, and when the file becomes unnecessary and is deleted, the information data corresponding to the deleted file is deleted from the file list. Therefore, the overwriting in FIG. 9 can be interpreted as that the host wants to newly update previously recorded data, or treats already recorded data as unnecessary data deleted from the file list.
[0028]
The defect management method for an overwritable optical disc and the write processing including overwriting have been described above.
[0029]
Next, a description will be given of a method and a process for applying these two features, which have been conventionally applied only to rewritable optical disks, to a write-once optical disk.
[0030]
The defect management method in the write-once optical disk can be performed in the same method as the optical disk capable of overwriting, except for the method of using the defect management header area and the defect management table area. In other words, as in the case of an overwritable optical disk, as shown in FIG. 4, in response to a command from the host to “record data (N) in LBA (n)”, the drive responds to the user area corresponding to LBA (n). The data (N) is recorded at the physical address (PBA (a)) in the data. Then, the drive reads the data (N) recorded in the user area again from the disk, compares it with the data (N) received from the host, or includes the data (N) in the reproduced data by using the parity for error correction attached to the data. Check the number of errors. At this time, if the number of errors included in the reproduced data satisfies the defect recognition condition specified by the drive, the PBA on which the data is recorded is handled as a defect. When PBA (a) is determined as a defect, the position of the defect management table to be referred to is detected from the defect management header arranged in the lead-in, and the defect management table is used as a new defect replacement area in the spare area. Search for possible PBAs. The data (N) requested by the host is written again in the defect replacement area searched in this way, and the recorded data is reproduced and the defect qualification conditions are checked as in the work performed in the user area. If it is determined that there is no need to treat the PBA as a defect, the PBA (a) in the user area corresponding to the LBA (n) has been replaced by the PBA (b) in the spare area, in other words, the LBA (n) In order to show that PBA (b) (in the spare area) corresponds, “PBA (a) has a defect” in the defect management table and “PBA (b) is used in place of PBA (a)” , Or that the physical address corresponding to LBA (n) is PBA (b). Finally, as the information and position of the defect management table are updated, the information of the defect management table included in the defect management header is also updated.
[0031]
FIG. 7 is a diagram showing an arrangement of the defect management header and the defect management table included in FIG. Here, the defect management header is arranged in the defect management header area, and the defect management table is arranged in the defect management table area. In each area, a defect management header and a defect management table are recorded so as to be added from one direction to the other in the area. Therefore, the latest defect management header is always located at the end of the defect management header area, and the latest defect management table corresponding to the defect management header is obtained by using the defect management table pointer in the defect management header, or using the defect management header. Similarly, it is determined by reading the defect management table located at the end of the defect management table area. In this way, the drive can find out the defect management information written on the optical disk and manage it again. In a write-once optical disc, it is impossible to overwrite the already used area, and the defect management header and the defect management table cannot be updated if the respective areas are filled up. Therefore, it is necessary to secure the size of each area sufficiently from the beginning and to minimize the timing at which the drive updates information using an internal memory or the like.
[0032]
From this, it can be seen that as long as a sufficient defect management area can be secured even in the write-once optical disk, the same system as the optical disk capable of overwriting can be applied to the defect management system itself. Next, an operation of the write-once optical disc corresponding to a normal write command from the host will be described, and thereafter, means for realizing an overwrite function of the write-once optical disc, which is an extension of the defect management method, will be described.
[0033]
FIG. 10 is a diagram showing a sequence in a case where a recording command is sent from the host to an empty area of the write-once optical disk. In response to a recording command including an LBA indicating the recording area from the host, the drive checks whether the PBA corresponding to the LBA indicated by the host is a used area or a free area, and determines that the PBA is a free area. Record the requested data.
[0034]
FIG. 11 is a user area bitmap for determining whether the area indicated by each PBA as used in FIG. 10 is a used area or a free area. In this user area bit map, bits corresponding to all addresses from the first address PBA (N) to PBA (N + M) in the user area are arranged in the map, and data is recorded at an arbitrary address. Then, by reversing the polarity of the value of the bit corresponding to the address, it is possible to determine the used area and the empty area. Therefore, in the example of FIG. 10, since the bit in the user area bit map corresponding to the PBA for the LBA indicating the recording area from the host has the polarity indicating the empty area, the drive can overwrite the PBA for the LBA as shown in FIG. In the case of an optical disk, data writing is performed similarly.
[0035]
FIG. 12 shows one method of extending the defect management method to realize an overwrite function in a write-once optical disc. In response to a recording command from the host including an LBA indicating the recording area, the drive checks whether the PBA corresponding to the LBA indicated by the host is a used area or a free area. If it is determined that this PBA is not a free area but a used area, a defect management header and a defect management table included in the lead-in are used similarly to the defect management method, and the used area is regarded as a defect area. Then, the recording position of the data (n) designated by the host is changed from the already used PBA (a) to the PBA (b) in the spare area, and the data recorded in the same manner in the user area is reproduced. It is confirmed whether or not the PBA (a) in the user area corresponding to the LBA (n) has been replaced with the PBA (b) in the spare area when it is determined that the PBA (n) does not need to be handled as a defect. In order to show that "PBA (a) has been used" and "PBA (a)" You use the A (b) ", or" physical address corresponding to LBA (n) adds information indicating that "has been changed to the PBA (b). By treating the used area in the same manner as the default, the conventional defect management method can be extended, and the overwriting function can be applied to the write-once optical disc. However, the overwrite function realized by extending this defect management method is limited to the size of the spare area area when overwriting a small-sized file over and over. For example, although the user area is hardly used, the spare area is completely filled, and the disk capacity cannot be used efficiently. Therefore, an overwrite function that can efficiently use the user area is realized as follows.
[0036]
FIG. 13 is a diagram showing a sequence in the case where a recording command comes from the host to the used area of the write-once optical disk. In response to a recording command from the host including an LBA indicating the recording area, the drive checks whether the PBA corresponding to the LBA indicated by the host is a used area or a free area. After determining that the PBA is not a free area but a used area, control is performed using an LBA management header and an LBA management table included in the lead-in set for write-once, as in the defect management method. The LBA management header includes a pointer pointing to the LBA management table, and in the LBA management table indicated in the LBA management header, a correspondence table between the LBA and the PBA used by the host is created similarly to the defect management table. That is, in response to a recording command from the host, an empty area in the user data is searched for, and the data requested by the host is recorded in the PBA of the empty area. Thereafter, this information is added to the LBA management table in order to record the relationship between the LBA requested by the host and the PBA in which the data is recorded, and the updated LBA management table is recorded in the LBA management table area. The LBA management header including the LBA management table pointer is also updated and recorded at a predetermined position in the LBA management header area. Here, how the newly generated LBA management information is registered in the LBA management table will be described with reference to the drawings.
[0037]
FIG. 14 shows an example of the configuration of LBA management information handled as one unit. In this figure, the above table shows the new LBA management information created when the following overwriting occurs. When the drive receives a write command from LBA (m) to LBA (n-1) from the host, the corresponding PBA (M) to PMA (N-1) have already been used and the drive is in the user area. When data from LBA (m) to LBA (n-1) is newly assigned to the free area PBA (S) to PBA (T-1), "LBA (m) to LBA (n-1) is used as new LBA management information. ) Is assigned from PBA (S) to PBA (T-1) ", it is sufficient that the additional list is" LBA for which overwriting has started "and" PBA for which overwriting has started. " ”And“ overwritten LBA ”, and the corresponding“ overwritten PBA ”. Also, this configuration may be “LBA where overwriting has started”, “PBA where overwriting has started”, and “number of addresses where overwriting has been performed consecutively”, or “virtual overwriting has started. PBA "," PBA actually started recording "," PBA virtually overwritten "," PBA actually recorded "corresponding thereto, or" virtual overwriting ". It can be easily guessed that the same result can be obtained as "the PBA at which recording has been started", the "PBA at which recording has actually started", and the "number of addresses at which continuous overwriting has been performed".
[0038]
Next, when the LBA management table is composed of a plurality of lists in this format, when new information is added by newly performed virtual overwriting, that is, how to process the list when the list is added The rules to be introduced will be described. In addition, in order to easily explain here and in consideration of practical use efficiency, each list in the LBA management table is always rearranged in ascending order of “LBA whose overwriting has been started” located at the head of the list. And
[0039]
FIG. 15 shows that the host writes from LBA (m) to LBA (n-1) after "LBA (l) to LBA (m-1) are allocated to PBA (R) to PBA (S-1)". Although the command has been issued, the corresponding PBA (M) to PMA (N-1) have already been used, and the drive has shifted from the free area PBA (S) in the user area to the PBA (T-1) with the LBA (T-1). This is an example of a case where data of LBA (n-1) from m) is newly assigned. In this case, a new list such as “LBA (m) to LBA (n−1) is assigned to PBA (S) to PBA (T−1)” is not directly added to the LBA management list, and the area of the LBA management list is not added. For the purpose of minimizing, the "overwritten LBA" and the corresponding "overwritten PBA" in the list immediately before the position where the additional list will be placed when a new list is added The “LBA where overwriting has started” in the list to be newly added and the corresponding “PBA where overwriting has started” are compared, and the “LBA in which overwriting has ended” in the immediately preceding list and the “LBA in which the overwriting has ended” are compared. The LBA for which overwriting has been started, the PBA for which overwriting has been completed in the immediately preceding list, and the PBA for which overwriting has been started in the additional list are each consecutive. , The two lists are combined into one list such as "LBA (l) to LBA (n-1) are assigned to PBA (R) to PBA (T-1)". , LBA management list.
[0040]
FIG. 16 is included in the range from LBA (l) to LBA (n-1) after "LBA (l) to LBA (n-1) is allocated to PBA (R) to PBA (T-1)". An overwrite request from LBA (m) to LBA (n-1) is issued again from the host, and the drive changes the free area PBA (Q) to PBA (P-1) in the user area from LBA (m) to LBA (n). This is an example of a case where data of -1) is newly re-allocated. In this case, a list such as “assign LBA (m) to LBA (n−1) from PBA (Q) to PBA (P−1)” is newly added to the LBA management list, but is registered in the LBA management list. The purpose of making the LBA range correspond to an arbitrary PBA on a one-to-one basis is, for example, when there are a plurality of lists including the LBA (a) in the LBA management table, when reading the LBA (a), For the purpose of preventing the user from losing sight of whether to read data, when a new list is added, the “overwrite-completed LBA” in the list immediately before the position where the additional list is arranged and the “overwrite in the The magnitude relationship between “started LBA” and “overwritten LBA” is compared. If it is determined that all or part of the LBA range of the additional list is included in the LBA range of the list immediately before the additional list, the additional list is arranged so as to omit the LBA range of the newly added list. It becomes necessary to modify the LBA range of the list immediately before the position and the corresponding PBA. For example, this process will be described with reference to FIG. 16 as an example. When a list is newly added, the list “LBA (l) to LBA (n−1) immediately before the position where the additional list is arranged is the PBA (R ) To PBA (T-1) "and newly added" LBA (m) to LBA (n-1) is assigned from PBA (Q) to PBA (P-1) ". Since all LBAs in the range of “LBA (m) to LBA (n−1)” in the additional list are included in “LBA (l) to LBA (n−1)” in the immediately preceding list, The list located immediately before the additional list also excludes “LBA (m) to LBA (n−1)” so that “LBA (l) to LBA (m−1) changes from PBA (R) to PBA (S−1)”. Has been assigned to It is. Note that PBA (S-1) can be easily obtained from the relationship between LBA (n-1) and LBA (m-1), that is, the difference value and PBA (T-1).
[0041]
FIG. 17 shows an example of the form of the overwriting function on the write-once optical disc realized by combining the overwriting function by the extension of the defect management method in FIG. 12 and the overwriting function by the LBA-PBA registration method in the user area. . This means that the overwriting method described with reference to FIG. 12 and the overwriting method described with reference to FIG. 13 are independent of each other, so that each method can be used properly depending on the usage.
[0042]
FIG. 1 shows an example in which the overwrite function in the write-once optical disk is used together with the defect management function as in FIG. As described above, a defect management condition realized by the same method as that of the rewritable optical disk includes a condition that a defect management table area located in the lead-in is sufficiently secured. Further, when the LBA management table is arranged in another area or in the same area, it is obvious that a similar problem occurs. Therefore, the LBA management table is arranged in the user area, and only the LBA management header including the pointer indicating the latest LBA management table is shared with the defect management header, so that the area secured by arranging the LBA management table in the lead-in can be secured. Solve a problem. In such a case, it is not necessary to arrange the area for the LBA management table in the user area, and it is possible to search for a free area and arrange the LBA management table at an address in an arbitrary user area as in the case of arranging overwrite data. It becomes. Further, although this figure shows an example in which only the LBA management table is arranged in the user area, it is apparent that the defect management table can be similarly arranged in the user area. However, in general, it is possible to estimate the size of the defect management table area from the number of spare areas, but the size of the LBA management table due to overwriting greatly changes depending on the usage of the user, so that the size is ultimately necessary. Considering that it is difficult to estimate the size of the region, it is considered that the arrangement form of FIG. 1 is desirable. In this example, as in the other examples, in response to a recording command including the LBA indicating the recording area from the host at the time of recording, the drive first determines whether the PBA corresponding to the LBA indicated by the host is a used area or an empty area. Check if it is. After judging that the PBA is not a free area but a used area, an unrecorded area of the user area on the disk is searched, and data transferred from the host is recorded at that position. Since the relationship between LBA and PBA is managed using the defect / LBA management header included in the lead-in and the LBA management table arranged in the user area, the LBA management table indicated by the pointer in the defect / LBA management header Using (N-1), a newly added LBA and PBA correspondence list is created as an LBA management table (N), which is recorded in a free area of the user area and includes a defect including a new pointer. The / LBA management header is also updated in an area at a predetermined position.
[0043]
As described above, in an optical disc in which the correspondence between LBA and PBA is managed by the LBA management header and the LBA management table, at the time of playback, in response to a playback request from the host, the PBA corresponding to the LBA included in the request is stored in the LBA management table. If the LBA requested to be reproduced is not in the LBA management table, the data is read from the originally associated PBA, and if the LBA is in the LBA management table, the data is read from the PBA associated in the LBA management table. Is read.
[0044]
【The invention's effect】
By using the method of the present invention that enables logical overwriting of a write-once optical disk that cannot be physically overwritten, the host can handle the write-once optical disk in the same way as an overwritable optical disk. Become. In addition, the disc can be used efficiently and without waste by being handled the same as the defect management function and independently.
[Brief description of the drawings]
FIG. 1 is a sectional view of a write-once optical disc showing a method for realizing a defect management and overwrite function.
FIG. 2 is a cross-sectional view of the optical disc showing a logical data arrangement for implementing defect management.
FIG. 3 is a diagram of an optical disk reproducing device.
FIG. 4 is a cross-sectional view of an optical disc showing a method for implementing defect management.
FIG. 5 is a flowchart showing the operation of the optical disc.
FIG. 6 is a sectional view showing a physical arrangement of an overwritable optical disk.
FIG. 7 is a diagram illustrating a method of using a defect management header and a defect management table in a defect management header area and a defect management table area.
FIG. 8 is a cross-sectional view of an overwritable optical disc showing a data arrangement when a command for recording data in a free area is received from a host.
FIG. 9 is a cross-sectional view of an overwritable optical disc showing a data arrangement when a command to record data in a used area is received from a host.
FIG. 10 is a sectional view of a write-once optical disc showing a data arrangement when a command for recording data in a free area is received from a host.
FIG. 11 is a cross-sectional view of a write-once optical disc showing a data arrangement when a command for recording data in a used area is received from a host.
FIG. 12 is a cross-sectional view of a write-once optical disc showing a method of realizing an overwrite function by extending defect management.
FIG. 13 is a cross-sectional view of a write-once optical disc showing a method of realizing an overwrite function by using a user area as a replacement area.
FIG. 14 is a diagram illustrating an example of a configuration of an additional list in the LBA management list.
FIG. 15 is a diagram showing a list compression method performed when a new list is added to the LBA management list, or a method of applying the method.
FIG. 16 is a diagram illustrating a duplicate LBA elimination method performed when a new list is added to the LBA management list, or a method of applying the same.
FIG. 17 is a cross-sectional view of a write-once optical disc showing a method for simultaneously realizing the overwrite function by extending the defect management and using the overwrite function and the user area as the replacement area.
[Explanation of symbols]
11 optical disk, 2 optical head, 21 optical spot, 22 optical beam, 23 objective lens, 24 collimator lens, 25 laser, 26 detector, 27 detector, 28 beam splitter, 29 ... hologram element, 31 ... lens actuator, 41 ... signal reproduction block.

Claims (10)

In a method of recording digital data on a non-overwritable optical disk having a physical address in a recordable part,
The recordable part of the optical disc is divided into a lead-in area, a user area, and a lead-out area using a physical address,
An information area including a pointer to a list table for managing logical addresses allocated to the entire user area is provided in a part of the lead-in area,
An optical disk recording method, wherein the logical address management list table is configured by arranging a list indicating correspondence between logical addresses and physical addresses in a user area. 2. The optical disk recording method according to claim 1, wherein the logical address management list table is arranged in the lead-in area. 2. The optical disk recording method according to claim 1, wherein the logical address management list table is arranged in the user area. 2. The optical disk recording method according to claim 1, wherein the logical address management list is recorded each time data is recorded in a free area in the user area instead of recording data again in a logical address corresponding to a used area in the user area. An optical disc recording method characterized by updating a table. 2. The optical disk recording method according to claim 1, wherein the logical address management list constituting the logical address management list table is rearranged according to a logical address included in the list, and corresponds to a used area in the user area. A list indicating that the relationship between the logical address and the physical address has been changed each time data is recorded in the free area in the user area instead of recording data again in the logical address is added to the logical address management list table, The added logical address management list and the adjacent logical address management list are added according to the relationship between the logical address and physical address of the added logical address management list and the logical address and physical address of the adjacent logical address management list. Optical data characterized by being combined into one logical address management list. Disk recording method. 2. The optical disk recording method according to claim 1, wherein the logical address management list constituting the logical address management list table is rearranged according to a logical address included in the list, and corresponds to a used area in the user area. A list indicating that the relationship between the logical address and the physical address has been changed each time data is recorded in the free area in the user area instead of recording data again in the logical address is added to the logical address management list table, Correct the above other logical address management list so that any logical address of the added logical address management list and the logical address included in the other logical address management list constituting the logical address management list table do not overlap. An optical disk recording method, comprising: In a method of recording digital data on a non-overwritable optical disk having a physical address in a recordable part,
The recordable portion of the optical disc is divided into a lead-in area, a spare area, a user area, and a lead-out area using physical addresses, and a part of the lead-in area is used to manage logical addresses allocated to the entire user area. An information area including a pointer to a list table and a pointer to a list table for managing a spare area is provided, and the logical address management list table arranges a list indicating correspondence between a logical address and a physical address in a user area. The spare area management list table is arranged and arranged in the user area, and a list showing correspondence between physical addresses in the user area and physical addresses in the spare area is arranged and arranged in the lead-in area. An optical disc recording method characterized by being performed. 8. The optical disk recording method according to claim 7, wherein data is recorded in an empty area in the user area or an empty area in the spare area instead of recording data again at a logical address corresponding to a used area in the user area. An optical disk recording method, wherein the logical address management list table is updated each time the operation is performed. In a method for reproducing digital data from a recordable optical disk on which a logical address management list table indicating correspondence between a logical address and a physical address in a user area is recorded,
An optical disk reproducing method comprising: reproducing data on the optical disk by using correspondence between a logical address in a logical address management list table and a physical address in a user area. In an optical disc reproducing apparatus capable of reproducing a recordable optical disc on which a logical address management list table indicating a correspondence between a logical address and a physical address in a user area is recorded,
When reading a list corresponding to the logical address of the logical address management list table arranged on the optical disk and the physical address in the user area, and then reading data at a logical address described in the logical address management list table An optical disk reproducing apparatus for reading data from a physical address in a user area corresponding to a logical address of the logical address management list table.

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