CN1745427B - Method and apparatus for managing overwriting on a write-once optical disc - Google Patents

Abstract

A method of managing overwrite and a method of recording management information on an optical disc write once can make it possible to perform a logical overwrite on the disc and thus heighten the use efficiency of the disc. The method includes replacement-recording data which is requested to be overwritten in a specified area of the disc where recording is completed in another data area physically separated from the specified area in the disc, and producing and recording management information for reproducing the physically replacement-recorded data.

Description

Method and apparatus for managing overwriting on a write-once optical disc

technical field

The present invention relates to methods and apparatus for managing overwriting on write-once optical discs.

Background technique

Recently, it is expected to develop and produce new HD-DVD (High Density Digital Versatile Disc) on which video data and audio data can be written and stored with high quality and high quantity, such as BD-RE (Blu-ray Disc Rewritable)

As shown in FIG. 1, BD-RE is divided into LIA (Lead-In Area), Data Area, and LOA (Lead-Out Area). At the head and tail of the data area, ISA (Inner Spare Area) and OSA (Outer Spare Area) are arranged separately.

On the BD-RE, data is recorded in units of clusters corresponding to a specific recording unit, and data can be repeatedly recorded in a specific area of the BD-RE, which is called physical overwriting. At this time, as shown in FIG. 1, it detects whether there is any defective area in the data area during data recording. If a defective area is detected, a series of replacement-recording operations for performing a replacement-recording step of data recorded in a defective area (eg, ISA) is performed. In addition, position information of a defective area and position information of a replacement record in a spare area are recorded and stored as management information in a defect list in a DMA (Defect Management Area) in a read-in area.

At the same time, the standard of BD-WO (Blu-ray Write Once Disc) has recently been discussed among related companies, and since BD-WO can only be recorded once on the entire disc area, it is physically impossible to record on BD-WO, unlike BD-RE. -WO for rewriting.

However, rewriting must be performed on the BD-WO in order to edit recorded data, modify a part of recorded data, or provide convenience to a user or a host, and thus an effective solution is urgently needed for this.

Contents of the invention

Accordingly, the present invention is directed to a method and apparatus for managing overwriting on a write-once optical disc that substantially obviates one or more problems due to limitations and disadvantages of the related art.

It is an object of the present invention to provide a method and apparatus for managing rewriting on a write-once optical disc, which can perform physical rewriting on the optical disc and maintain the continuity of the user data area after performing the physical rewriting .

Additional advantages, objects and features of the present invention will be set forth in part in the following description and in part will become apparent to those of ordinary skill in the art upon examination of the following or through practice of the present invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages, and in accordance with the objects of the present invention, as broadly embodied and described herein, a method of managing overwriting on a write-once optical disc comprises: replacing recording data requested to be rewritten in a specific area of the optical disc that has been recorded; and information on the last recordable position of the user data area changed according to the replacement recording operation is recorded in the management area of the optical disc.

According to another aspect of the present invention, a method of managing overwriting on a write-once optical disc includes: replacement recording is requested to be overwritten on an already recorded optical disc from an area before the outer spare area (OSA) of the optical disc expand the OSA up to the size of the replacement recording area; and record information on the last recordable position of the user data area that varies according to the expansion of the OSA in the management area of the optical disc.

According to yet another aspect of the present invention, a method of managing overwriting on a write-once optical disc comprises: alternately recording in the outer spare area (OSA) of the optical disc the specific data in the area; determining whether to extend the OSA in consideration of the size of the replacement recording area; and recording information on the last recordable position of the user data area changed according to the extension determination of the OSA in the management area of the optical disc.

In yet another aspect of the present invention, a method of managing rewriting on a write-once optical disc having multiple recording layers includes selectively replacing records in the user data area of each recording layer of the optical disc that are requested to be rewritten. data written in a specific area of the optical disc on which recording has been completed; and information on the last recordable position of the user data area of each recording layer which changes according to the replacement recording operation is recorded in the management area of the optical disc.

In another aspect of the present invention, a method of managing rewriting on a write-once optical disc includes: receiving a recording command requesting recording on a specific area of the optical disc; determining that the specific area is an already recorded area is also a non-recording area; and if it is judged that the specific area is a recorded area, data replacement is recorded in another area of the user data area, so that the continuity of the user data area can be ensured even after the replacement recording operation.

In yet another aspect of the present invention, an apparatus for recording/reproducing a write-once optical disc includes: a controller for transmitting a recording command for requesting recording on a specific area of the optical disc; and recording means , for judging whether the specific area is a recorded area or a non-recorded area, and if it is judged that the specific area is a recorded area, the data is replaced and recorded in another area of the user data area, so that even in The continuity of the user data area can also be ensured after the replacement record operation.

Description of drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the attached picture:

FIG. 1 schematically illustrates the structure of a BD-RE as a rewritable optical disc according to the related art;

Figure 2 illustrates the structure of a BD-WO as a write-once optical disc according to the present invention;

3A and 3B illustrate a method of managing rewriting on a write-once optical disc according to another embodiment of the present invention;

4 and 5 illustrate methods of managing rewriting on write-once optical discs according to other embodiments of the invention;

Figure 6 illustrates a method for managing rewriting on a write-once optical disc according to yet another embodiment of the present invention;

7 and 8 illustrate management information related to a method of managing rewriting on a write-once optical disc according to the present invention;

9 illustrates the BD-WO structure as a dual-layer type write-once optical disc according to the present invention;

FIG. 10 illustrates a method for managing rewriting on a dual-layer write-once optical disc according to one embodiment of the present invention;

11 illustrates a method for managing rewriting on a dual-layer type write-once optical disc according to another embodiment of the present invention;

12 and 13 illustrate methods for managing rewriting on a dual-layer type write-once optical disc according to other embodiments of the present invention;

14 and 15 illustrate management information related to a method for managing rewriting on a dual-layer type write-once optical disc according to the present invention; and

FIG. 16 illustrates an apparatus for recording/reproducing a write-once optical disc according to the present invention.

Detailed ways

Reference will now be made in detail to a method of managing overwriting on a write-once optical disc according to a preferred embodiment of the present invention, examples of which are illustrated in the accompanying drawings. Furthermore, broadly used general terms are selected in the description of the present invention. However, in special cases, terms selected at the applicant's discretion are also used, but their meanings will be described in detail in the corresponding sections of the description. Therefore, it should be understood that the present invention can be grasped by the meaning of the terms rather than the terms themselves.

The invention enables rewriting even on write-once optical discs. In general, the term "overwrite" means repeated recording on a specific area on a rewritable optical disc. In other words, the term "overwrite" is an inherent property of rewritable optical discs, and therefore it is generally considered impossible to perform rewriting on write-once optical discs.

However, the present invention makes it possible to perform rewriting logically while maintaining the physical properties of a write-once optical disc, ie the write-once property is maintained. In particular, this improves the usage efficiency of the optical disc by maintaining the continuity of the user data area after the physical rewrite operation. Now, different embodiments of the invention will be described, taking BD-WO as an example.

FIG. 2 illustrates the structure of a BD-WO as a write-once optical disc according to the present invention. A BD-WO (Blu-ray Write Once Disc) includes a LIA (Lead-in Area), a Data area, and a LOA (Lead-Out Area). In the head and tail of the data area, an ISA (Inner Spare Area) and an OSA (Outer Spare Area) are separately provided, and a user data area where data is actually recorded is located between the ISA and the OSA. An LSN (Logical Sector Number) is given to the user data area, and the user or host transmits a record command with reference to the LSN. The recording device converts the LSN into a PSN (Physical Sector Number), which actually represents position information in the optical disc, to execute a recording command.

Furthermore, in this disc, TDMA (Temporary Defect Management Area) is provided. TDFL (Temporary Defect List), TDDS (Temporary Disc Definition Structure), SBM (Spatial Bitmap) are recorded in TDMA as management information. According to the present invention, in recording management information after replacement recording, location information on the original area and replacement recording area is recorded in TDFL, and LSN indicating continuity of the user data area after replacement recording is recorded in TDDS.

In addition, by allocating one bit (which is the minimum recording unit) to each cluster, the SBM information recorded in TDMA indicates "1b" if the corresponding cluster is a recorded area, and "1b" if the cluster is a non-recorded area. 0b" and vice versa. Therefore, by reading the SBM information, it is convenient to know where there are recorded areas and non-recorded areas in the optical disc. After receiving the user's recording command for recording a specific area, the recording/reproducing device can judge the recording/non-recording state of the corresponding area through the SBM information, and if the specific area is a recorded area, execute the recording in another area of the data area. A replacement record for the data in the , to enable logical rewriting.

For a specific update timing, management information such as TDFL, TDDS, SBM, etc. recorded in TDMA is updated in the minimum unit of a cluster, and in a write-once optical disc, an area for recording management information such as TDMA is absolutely necessary .

In FIG. 2, if a recorded area exists in the data area, "overwriting" in the corresponding area is not physically allowed due to the characteristics of the write-once optical disc. But, if the recording command request of the user or the host computer is recorded on the A-B area (for example, the recorded area) shown in FIG. replacement record. Thus, a user or a host can order recording regardless of whether a specific area of the disc is recorded or not, so the user can use a write-once disc just like a rewritable disc. This is called a logical overwrite (LOW) to distinguish it from a physical overwrite.

Furthermore, when the recording command on the A-B area shown in FIG. 2 is executed, since it is an already recorded area, rewriting cannot be performed on the corresponding area. However, the recording command can be performed in the following manner: the data is replaced-recorded in the data zone, and especially in the position of the data zone that ensures the continuity of the user data zone, and the corresponding management zone is recorded in the TDMA of the optical disc, so that Complete execution of the recorded command.

Figure 3A illustrates a method of managing overwriting on a write-once optical disc according to the present invention. In order to maintain the continuity of the user data area after replacement recording in the data of the area (for example, A-B area) for which the rewriting is requested in another area of the data area, replace the recording data from the front of the OSA, and in the replacement After recording, change the last recordable position of the user data area. In this way, before the replacement recording, the user data area has the last LSN information corresponding to the just front position of the OSA, but after the replacement recording, a new last LSN is provided to the user data area. This way, users or hosts are logged based on the LSN command, thus excluding logged zones from the LSN. As a result, the continuity of the user data area is generally maintained, and convenient operation of the recording/reproducing apparatus (numeral "10" in FIG. 16) is provided during execution of optical disk recording.

Fig. 3B is a partially enlarged view of a replacement recording area (for example, a-b area). This replacement recording is performed from the old last LSN position, and after the replacement recording is completed, the last LSN of the recordable user data area is provided to just before the "a" position, so that the next rewriting will be performed from the new last LSN.

As described above, the information according to the change of the last LSN after the replacement recording should be recorded in an arbitrary position in the disc management area, and in the present invention, for example, the information is recorded in the TDDS of TDMA. TDDS includes a lot of general disc management information, and since the most recent information is recorded in TDDS for each update timing, TDDS will be most suitable for recording this management information.

FIG. 4 illustrates a method of managing overwriting on a write-once optical disc according to another embodiment of the present invention. In order to maintain the continuity of the user data area after replacement recording in the data of the area (for example, A-B area) where the replacement recording is requested to be rewritten in another area of the data area, from the area before OSA (i.e., in a-b) For replacement recording, the OSA is extended to the size of the replacement recording area, and then information on the last recordable position of the user data area changed according to the extended OSA is recorded as management information.

FIG. 5 illustrates a method of managing overwriting on a write-once optical disc according to yet another embodiment of the present invention. Replacement recording in another area of the data area in the data of the area where rewriting is requested (for example, A-B area) In order to maintain the continuity of the user data area after replacement recording, when performing replacement recording in OSA, after the replacement recording operation The OSA is made expandable in consideration of the size of the replacement recording area, and if the OSA is extended, information on the last recordable position of the user data area changed according to the extended OSA is recorded as management information. In addition, considering the size of the replacement recording area after the replacement recording operation, the OSA may not be extended, and if the OSA is not extended, the last recordable location information of the user data area is not changed. In addition, the OSA can be extended before the replacement recording operation, and the extension of the OSA can be performed according to a user's request during system initialization or during use of the optical disc.

Fig. 7 schematically shows the structure of the TDDS according to the embodiment of the present invention of Figs. 3, 4 and 5, in which LSN information changed by performing replacement recording by rewriting request is recorded.

In TDDS, fields for recording the location information of "LSN=0" and the location information of "Last LSN" are provided, and as long as the TDDS is updated, the location information of "LSN=0" and the location of "Last LSN" are recorded information. Therefore, in the embodiments of the present invention of FIGS. 3, 4 and 5, replacement recording is performed according to the rewrite request, and the last LSN information changed by the replacement recording is recorded.

Fig. 6 shows a method of managing overwriting on a write-once optical disc according to yet another embodiment of the present invention. In order to maintain the continuity of the user data area after replacement recording, from the area before OSA (i.e., in the a-b area) in the data of the area (i.e., A-B area) for which rewriting is requested in another area of the data area Replacement recording is performed, the OSA is expanded to the size of the replacement recording area, and then, the last recordable position of the user data area is changed after the replacement recording. Unlike the embodiments of Figs. 3, 4 and 5, according to the embodiment of Fig. 6, the last LSN value (before OSA) provided to the user data area before the replacement recording remains unchanged, and a new last LSN is provided after the replacement recording to the user data area. This is specifically referred to as the usable last LSN of the user data area.

FIG. 8 shows the management information recorded in the TDDS when the method in FIG. 6 is executed. The TDDS includes the old last LSN value and available last LSN information that changed after the record was replaced.

9 to 15 illustrate a method of managing overwriting on a dual-layer type write-once optical disc according to an embodiment of the present invention. Now, an embodiment of the present invention will be described, taking BD-WO as an example of a write-once optical disc.

First, FIG. 9 illustrates the structure of a BD-WO as a dual-layer type write-once optical disc according to the present invention. Compared with the single-layer type write-once optical disc shown in FIG. 2 , the BD-WO of FIG. 9 shows a dual-layer type write-once optical disc, and two recording layers are referred to as layer 0 and layer 1 .

According to the dual-layer type BD-WO, the LSN provided to the user data area is a continuous value from the end of ISA0 of layer 0 to the front of ISA1 of layer 1 (ie, the last LSN). For LIA and LOA, TDMA0 and TDMA1 for recording management information are assigned respectively, and TDFL, TDDS, and SBM information are recorded in TDMA0 and TDMA1 in the same manner as single-layer type BD-WO.

FIG. 10 illustrates a method of managing overwriting on a dual-layer type write-once optical disc, which corresponds to the method of managing overwriting on a single-layer type write-once optical disc of FIG. 3, according to an embodiment of the present invention. In order to maintain the continuity of the user data area after replacement recording in the data of the area (for example, C-D area) for which the replacement recording is requested to be rewritten in another area of the data area, replace from the front part of ISA1 (for example, c-d area) Data is recorded, and after replacement recording, the last recordable position of the user data area is changed. In this case, the rewriting operation is performed in the same manner as the single-layer type write-once optical disc. That is, before the replacement recording, the user data area has the last LSN information corresponding to the position just before the ISA1, but after the replacement recording, a new last LSN is provided to the user data area. Management information is recorded in TDDS of TDMA, and as shown in FIG. 7, a new last LSN information value is recorded during TDDS update timing.

In the case of a dual-layer type disc, replacement recording of data before the OSA or in the OSA of a single-layer type disc as shown in FIGS. 4 and 5 can also be applied in the same manner, and in this case, the layer ISA1 of 1 will be the extended spare area.

FIG. 11 illustrates a method of managing overwriting on a dual-layer type write-once optical disc, which corresponds to the method of overwriting on the single-layer type write-once optical disc of FIG. 6, according to another embodiment of the present invention. When replacing the data in the area (for example, C-D area) for which rewriting is requested in another area of the data area in order to maintain the continuity of the user data area after replacement recording, replace from the front of ISA1 (for example, c-d area) Data is recorded, and after replacement recording, the last recordable position of the user data area is changed. That is, the last LSN information (before ISA1) provided to the user data area before the replacement recording remains as it is, and a new last LSN is provided to the user data area after the replacement recording. This is specifically referred to as the last LSN available for the user data area. Management information is recorded in TDDS of TDMA, and as shown in FIG. 8, a new usable last LSN information value is recorded during TDDS update timing.

FIG. 12 illustrates a method of managing overwriting on a dual-layer type write-once optical disc having last LSN information corresponding to each recording layer according to still another embodiment of the present invention. In other areas of the data area, data in the areas where rewriting is requested (for example, A-B area and C-D area) is replaced and recorded in the data area. In order to maintain the continuity of the user data area after replacement recording, the data in the A-B area is replaced and recorded in OSA0. The front part (for example, a-b area), and the data of C-D area are replaced and recorded in the front part of ISA1 (for example, c-d area). Also, after replacement recording, the last recordable position of the user data area is changed with respect to each recording layer. In this case, replacement recording can be performed for each recording layer of the dual-layer type optical disc. In this way, before the replacement recording, the last LSN information is provided to the user data area of each recording layer (for example, the last LSN of layer 0 and layer 1), but after the replacement recording, the new last LSN information is provided to the user data area of each recording layer User data area. Management information is recorded in TDDS of TDMA, and as shown in FIG. 14, new last LSN information is recorded for each recording layer during TDDS update timing.

In the case of a dual-layer type optical disc, replacement recording of data in the OSA or at the front of the OSA of a single-layer type optical disc as shown in FIGS. is the extended spare area of layer 0, and ISA1 will be the extended spare area of layer 1.

FIG. 13 illustrates a method of managing overwriting on a dual-layer type write-once optical disc according to another embodiment of the present invention. Replacement recording in other areas of the data area in the data of the area where rewriting is requested (for example, A-B area and C-D area) In order to maintain the continuity of the user data area after replacement recording, the data of the A-B area is replaced and recorded before OSA0 (for example, a-b area), and the data of C-D area is replaced and recorded before ISA1 (for example, c-d area). Also, after replacement recording, the last recordable position of the user data area is changed with respect to each recording layer. In this case, replacement recording is available for each recording layer of a dual-layer type optical disc. That is, the last LSN information provided to the user data area of each recording layer (for example, the last LSN of layer 0 and layer 1) remains as it is, but after replacement recording, a new last LSN is provided to the user data area of each recording layer . They are specifically referred to as the available last LSNs of the available user data areas of layer 0 and layer 1 . Management information is recorded in TDDS of TDMA, and as shown in FIG. 15, during TDDS update timing, a new last LSN information value is recorded for each recording layer.

FIG. 13 shows an apparatus for recording/reproducing a write-once optical disc according to the present invention. The recording/reproducing device includes a recording/reproducing device for recording/reproducing on an optical disc and a controller for controlling the device. The controller is used to provide a recording/reproducing command to the recording/reproducing device, and the recording/reproducing device performs recording/reproducing on a specific area of the optical disc according to the command of the controller. The recording/reproducing apparatus 10 includes an interface 12 for communicating with the outside, an optical pickup 11 for recording or reproducing data on an optical disc, and is used to receive a reproduction signal from the optical pickup to restore to a desired signal value or to modulate a signal to be recorded to be possible. A data processor 13 for transferring the modulated signal from a signal recorded on an optical disc, a servo unit 14 for controlling an optical pickup 11 to accurately read a signal from an optical disc or write a signal on an optical disc, for temporary storage including management A memory 15 for various information of information and data and a microcomputer 16 for controlling constituent elements of the recording/reproducing apparatus.

During the recording operation, all management information of the optical disc is read out and stored in the memory 15 of the recording/reproducing apparatus, and the management information is used for the recording/reproducing operation on the optical disc. If data needs to be recorded in a specific area of the optical disc, the controller 20 transfers the location information together with the data to be recorded to the recording/reproducing device. The microcomputer 16 in the recording/reproducing apparatus 10 receives the recording command, and judges from the management information stored in the memory 15 (in particular, the SBM information explained with reference to FIGS. A recorded area is also a non-recorded area. If it judges that this area is a non-recording area, then the microcomputer 16 records according to the recording command of the controller 20, and if it judges that this area is a recorded area, then the microcomputer 16 replaces and records this data in another area of the data area , so that the continuity of the user data area can be ensured.

Industrial application

Therefore, the present invention enables logical rewriting while maintaining the physical characteristics of a write-once optical disc, that is, the write-once characteristic. In particular, it improves the usage efficiency of the disc by maintaining the continuity of the user data area after the physical rewrite operation.

It will be apparent to those skilled in the art that various modifications and changes can be made in the present invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims (19)

1. A method of managing overwriting on a write-once optical disc comprising a data area with a spare area and a user data area, the user data area being given a logical sector number, characterized in that it comprises : From the back of the user data area of the optical disc, a replacement recording operation is performed by writing replacement data in a specific area requested to be rewritten in which data has already been recorded; recording first information representing the last logical sector number of the user data area changed according to the replacement recording operation in the management area of the optical disc; and In the management area is recorded second information indicating the specific area and the location of the replacement data recorded in the user data area. 2. The method of claim 1, wherein the last logical sector number information of the user data area is obtained by updating information on a previous last logical sector number of the user data area. 3. The method according to claim 1, wherein the last logical sector number information of the user data area is updated with new management information, while the information about the previous last logical sector number of the user data area remains as it is . 4. The method according to claim 1, wherein said write-once optical disc is a dual-layer type write-once optical disc, to which said method is applied in the same manner. 5. A method as claimed in claim 4, characterized in that, like one recording layer, the double layer has the user data area provided consecutively. 6. The method of claim 4, wherein the first information represents the last logical sector number of the user data area of each recording layer of the optical disc. 7. A method of managing overwriting on a write-once optical disc comprising a data area with a spare area and a user data area, the user data area being given a logical sector number, characterized in that it comprises : performing a replacement recording operation by writing replacement data in a specific area requested to rewrite data already recorded therein, from an area preceding the outer spare area of the optical disc; expanding the outer spare area to the size of the replacement data; In the management area of the optical disc, recording first information representing the last logical sector number of the user data area changed according to the extension of the outer spare area; and In the management area is recorded second information indicating the specific area and the location of the replacement data recorded in the user data area. 8. A method of managing overwriting on a write-once optical disc, comprising: In the outer spare area of the optical disc, a replacement recording operation is performed by writing replacement data in a specific area requested to be rewritten in which data has already been recorded; Considering the size of the replacement data, it is judged whether to extend the external spare area; In the management area of the optical disc, recording first information representing the last logical sector number of the user data area changed according to the judgment of extension of the outer spare area; and In the management area is recorded second information indicating the specific area and the location of the replacement data recorded in the outer spare area. 9. The method of claim 8, wherein whether to expand the outer spare area is determined before the replacement recording operation. 10. The method of claim 8, wherein whether to extend the outer spare area is determined during initialization of the optical disc. 11. A method of managing overwriting on a write-once optical disc comprising a data area with a spare area and a user data area, the user data area being given a logical sector number, characterized in that it comprises : receiving a recording command requesting recording on a specific area of the optical disc; judging whether the specific area is a recorded area or a non-recorded area; and If it is judged that the specific area is a recorded area, then performing a replacement recording operation by writing replacement data in another area of the user data area, so that the continuity of the user data area can be ensured after the replacement recording operation; and In the management area of the optical disc, first information indicating the last logical sector number of the user data area changed by the replacement recording operation is recorded. 12. The method as claimed in claim 11, characterized in that the latest space bitmap (SBM) information recorded in the optical disc is used to judge whether the specific area is a recorded area or a non-recorded area. 13. A device for managing rewriting on a write-once optical disc comprising a data area with a spare area and a user data area on which logical sector numbers are given, characterized in that the Said devices include: means for performing a replacement recording operation by writing replacement data in a specific area requested to be rewritten in which data has already been recorded, from the rear of the user data area of an optical disc; means for recording first information indicating the last logical sector number of the user data area changed according to the replacement recording operation in the management area of the optical disc; and means for recording second information in the management area, the second information indicating the specific area and the location of the replacement data recorded in the user data area. 14. The apparatus according to claim 13, wherein the optical disc has two recording layers, and the first information includes the last logical sector number of the user data area of each recording layer of the optical disc, wherein the management The apparatus for rewriting on a write-once optical disc further includes means for recording first information including the last logical sector number of the user data area of each recording layer in the management area. 15. A device for managing rewriting on a write-once optical disc comprising a data area with a spare area and a user data area on which logical sector numbers are given, characterized in that the Said devices include: A device for performing a replacement recording operation by writing replacement data in a specific area requested to overwrite data already recorded therein, starting from the area before the outer spare area of the optical disc; means for extending the external spare area up to the size of the replacement data; In the management area of the optical disc, means for recording first information representing the last logical sector number of the user data area changed according to the extension of the outer spare area; and means for recording second information in the management area, the second information indicating the specific area and the location of the replacement data recorded in the user data area. 16. An apparatus for managing overwriting on a write-once optical disc, characterized in that said apparatus comprises: means for performing a replacement recording operation by writing replacement data in a specific area requested to be rewritten in an external spare area of an optical disc; means for judging whether to extend the external spare area in consideration of the size of the replacement data; In the management area of the optical disc, means for recording the first information representing the last logical sector number of the user data area changed according to the determination of the extension of the outer spare area; and means for recording second information in the management area, the second information indicating the specific area and the location of the replacement data recorded in the outer spare area. 17. The apparatus according to claim 16, further comprising means for determining whether to expand the outer spare area before the replacement recording operation. 18. The apparatus of claim 16, further comprising means for determining whether to extend the outer spare area during initialization of the optical disc. 19. A device for recording/reproducing a write-once optical disc comprising a data area with a spare area and a user data area on which logical sector numbers are given, characterized in that the Said devices include: means for receiving a recording command for requesting to record data on a specific area in which data has already been recorded; means for performing a replacement recording operation by writing replacement data in another area of the user data area so as to ensure the continuity of the user data area even after the replacement recording operation; and In the management area of the optical disc, means for recording first information representing the last logical sector number of the user data area changed according to the replacement recording operation.

Images