KR20050035452A - Method and apparatus for recording the data on optical disc write once - Google Patents

Abstract

The present invention relates to an optical disc that can be recorded once, and a recording method and a recording / playback apparatus for an optical disc. When changing to a non-writable area, dummy data of a certain size is recorded after the last recorded area in the additional recordable area to indicate that the area has been changed to a non-recordable area, and the recording status information of the disc including the changed area is displayed. It is characterized by recording in the management area of the disc, thereby enabling effective data recording even in a write once optical disc having a new physical structure.

Description

Recording method and recording / reproducing apparatus for optical disc and optical disc which can be recorded once [Method and apparatus for recording the data on optical disc write once}

The present invention relates to an optical disc, a recording method of an optical disc, and a recording and reproducing apparatus.

As optical recording media, optical disks capable of recording large amounts of data are widely used. Recently, new high-density optical recording media (HD-DVD), for example, Blu-ray Disc, which can record and store high-quality video data and high-quality audio data for a long time, have been developed.

Blu-ray Disc, the next-generation HD-DVD technology, is a next-generation optical recording solution that can store data that significantly surpasses existing DVDs. Recently, world-standard technical specifications have been established.

In this regard, standard proposals relating to Blu-ray Discs have been prepared, and various standard proposals have been prepared for rewritable Blu-ray Discs (BD-REs) and following write-once Blu-ray Discs (BD-WOs).

In particular, a standard method of recording once on a Blu-ray Disc (BD-WO) has discussed a method of recording management information of a disc. The management information indicates the recording state of the disc as a characteristic of an optical disc that can be written once. Includes a method of recording information (hereinafter referred to as " recording status information ").

In general, a write-once optical disc needs to accurately grasp the recording state of the current disc by the characteristic of "one-time" of recording, and for this purpose, it is necessary to record / manage recording state information in any form. Conventional write-once optical discs (CD-R, DVD-R, DVD + R) use these recording status information under various names, such as track information in CD series, and RZone in DVD series. ), Or fragments.

However, since the recording state information is determined by the structure of the disc and the method of distinguishing the recording area from the unrecorded area, etc., the standardized "recording state information" of the existing write once optical disc having the different disc structure is also different. It is standardized by contents.

In particular, the newly standardized write once Blu-ray Disc (BD-WO) is different from the existing write once discs (CD-R, DVD-R, DVD + R) in terms of physical structure and usage environment. It adopts a method of managing a disk defect in the drive itself (generally referred to as Physical Defect Management), and has a complicated disk structure such that an additional management area for defect management is required in the disk. More conventional disc recording status information cannot be applied.

Therefore, it is necessary to prepare new recording status information applicable to high density optical discs such as BD-WO, and an efficient optical disc recording method corresponding thereto is urgently needed. In particular, it is required to be provided as standardized information to ensure mutual compatibility. I will.

Accordingly, the present invention has been made in view of the above circumstances, and provides an efficient recording method of an optical disc that can be recorded once, and has the following characteristics.

To define a new type of additional recordable area (open SRR) and non-writable area (close SRR) in a disc, and to change the additional recordable area to a non-recordable area by a close command. ,

In addition, to provide a method of recording and managing the last recording state of the disc as recording status information in the management area of the disc,

In addition, if there is a loss in the recording state information before recording the user data to provide a method for confirming the final recording state on the disc,

Also, the present invention provides a recording method and a recording / playback apparatus on a disc using the above methods.

In the recording method of a write-once optical disc according to the present invention for achieving the above object, in the write-once optical disc that can be divided into an area capable of additional recording and an area in which no additional recording is possible, When changing to an area in which no additional recording is possible, record dummy data of a certain size after the last recorded area in the area in which additional recording is possible, indicating that the area is changed into an area in which no additional recording is possible, and recording status information of the disc including the changed area. Recording the data into the management area of the disk,

In addition, another recording method for a write once optical disc according to the present invention, when the disc is loaded, reads out the latest recording state information recorded in the management area, and then confirms whether the latest recording state information is lost. And if the latest recording state information is lost, inferring the final recording state of the disc from previously recorded non-lost recording state information, and additional recording according to the final recording state of the inferred disc. Characterized in that it comprises the steps of performing a recording in the possible area,

In addition, the write once optical disc according to the present invention has a data area that can be divided into an area capable of additional recording and an area in which no additional recording is possible, and when the area capable of additional recording is closed to an area in which no additional recording is possible. And a management area for indicating a closed area in the recordable area remaining in the additional recordable area, and recording the recording status information in the disc including the closed area.

In addition, the recording / reproducing apparatus of the write once optical disc according to the present invention generates a separate area for recording in a specific area in the disc, and then transfers a recording command. A control unit that transmits a command to close the area, and if a recordable area remains in the area after receiving the close command of the control area, a part of the area is recorded as dummy data, and the management area in the disc And a recording and reproducing section for recording the recording state information indicating that the area is closed at

In addition, another recording / reproducing apparatus of the write once optical disc according to the present invention reads out the latest recording state information recorded in the management area when the disc is loaded, and then checks whether the latest recording state information is lost. If the latest recording state information is lost, the recording / reproducing section infers the final recording state of the disc from the previously recorded non-lost recording state information, and based on the last recording state of the inferred disc. And a control unit for transmitting a recording command to an additional recordable area in the disc by the recording and reproducing unit.

      Hereinafter, a preferred embodiment of a disc management information recording method and a recording / reproducing apparatus of an optical disc according to the present invention will be described in detail with reference to the accompanying drawings. For convenience of explanation, a case of a write once Blu-ray Disc (BD-WO) will be described as an example.

In addition, the terms used in the present invention was selected as a general term widely used as possible now, but in certain cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, The present invention is to be understood as the meaning of terms rather than names.

In this regard, in the present invention, the recording state information of the disc is collectively referred to as "SRR information" (hereinafter referred to as "SRRI") as a meaning applied to the continuous recording mode of the Blu-ray Disc BD. In the case where a plurality of areas are formed in the disc and recording is performed in the corresponding areas, each of the formed areas will be referred to as a "Sequential Recording Range", and "session" means that at least one of the SRRs is at least one. The term "cluster" refers to the minimum recording unit of a Blu-ray Disc. The term "cluster" refers to the term used to distinguish SRR for compatibility with playback-only standards. do.

In addition, the SRR is largely divided into an open SRR and a closed SRR, and an open SRR means an SRR capable of additional recording in a corresponding area, and a closed SRR is additional recording in a corresponding area. This means that this impossible SRR will be described in detail later.

<Optical Disc Structure and SRR Information Structure (SRRI Strucrure)>

Fig. 1 specifically shows the structure of the SRR information as a writeable optical disc structure and recording state information to which the present invention is applied.

The write once optical disc of FIG. 1 shows a single layer disc having one recording layer, for example, and has a characteristic structure compared with the conventional write once optical disc and rewritable optical disc.

First, it is understood that a spare area (ISA0 / OSA0) for replacing and recording a defective area for physical defect management and a temporary defect management area (hereinafter referred to as 'TDMA') for managing information on the defective area are required. have. In general, a rewritable optical disc does not require a large amount of DMA, since even if it has a limited size of a defect management area (hereinafter referred to as 'DMA'), it can be repeatedly written and erased in this area. In the case of recordable optical discs, once recorded areas cannot be used for recording again, a larger size management area is required for defect management, and the final TDMA Since a process of transferring information to DMA may be necessary, this information is named as TDMA (Temporary DMA) to distinguish it from DMA.

1 shows that there are two types of TDMAs, firstly, PTDMA0 (Primary TDMA) allocated to a fixed size in the lead-in area, and secondly, a size interlocked with the size of the spare area in the outer spare area (OSA0). There is an ATDMA0 (Additional TDMA) assigned, and the size P of ATDMA0 is, for example, P = (N * 256) / 4 cluster, so that about one quarter of the total outer spare area (OSA0) size is suitable. In addition, although not shown in FIG. 1, if the dual layer disk has two recording layers, the PTDMA and ATDMA will be allocated to the other recording layers, in which case they will be named PTDMA1, ATDMA1, ATDMA2, respectively. .

Each PTDMA0 and ATDMA0 is the same management area, and the management information recorded in the area is also the same. The management information is recorded in the following manner. That is, the temporary defect list information ("TDFL" or below) and the temporary disc definition structure ("TDDS" or below) are stored in one recording unit (1 cluster in the case of BD-WO). Recorded (TDFL + TDDS) or SRR information and TDDS can be recorded in another recording unit (SRRI + TDDS).

The TDFL refers to information that manages a series of processes as a defective area list when a defective area is generated in the data area, and manages a series of processes as a defective area list. The size of the cluster is 1 to 4 clusters depending on the size of the defective area list. Write with. The SRR information is recording status information indicating whether a specific area of the disc is recorded or unrecorded. In particular, the SRR information may be applicable when the disc is a continuous recording method. In addition, TDDS is written in the last sector out of 32 sectors in one cluster, and important information for general management and defect management of the disk is recorded so that it is always written last when updating management information in TDMA.

The present invention relates to a method of recording disc recording status information applied to a new high density optical disc such as a BD-WO. In particular, the present invention uses SRR information as recording status information, and various SRR types as shown in FIGS. It is characterized in that the display, the structure of the SRR information (SRRI) of the present invention can be seen from the bottom of Figure 1 as follows.

First, the SRR information is largely composed of three parts: a header for recognizing the SRR information, a List of SRR entries indicating the SRR information, and an end of the SRR information. Is composed of SRR List Terminator.

The header is located at the head of the SRR information, and in addition to the "SRRI Structure identifier" field for recognizing the SRR information, the "List of opened SRRs" field indicating the position of the open SRR present in the corresponding SRR information, and the entire SRR. It contains information such as the "Number of SRR entries" field indicating the number of open and "Number of opened SRR" fields indicating the number of open SRR, so that the contents of the entire SRR information can be checked before reading the direct SRR entry list. Will be. Therefore, it is also possible to newly define and standardize necessary information other than the field in the header. In particular, the "List of opened SRRs" field is a recordable SRR existing in the current disk, and the number and position of open SRRs. Information that can be identified.

After the header, the SRR entry list is recorded, and when the SRR entry list ends, the SRR end display unit displays the end of the SRR information. Particularly, when the SRR information has a variable size, the SRR end display unit may have meaning as information for indicating an end point of the corresponding SRR information.

Therefore, as the disc recording status information, the SRR information is composed of a header, an SRR entry list, and an SRR end indicator, and all of these information will be collectively recorded every update.

Hereinafter, the SRR entry list will be described in more detail.

An SRR entry list means that a plurality of SRR entries are listed together, and one SRR entry is allocated by eight bytes to express information about one SRR in a disk. The entry consists of the SRR status information, the first address information (Start address of SRR) of the SRR, and the last address information (LRA of SRR) in which data is recorded in the SRR.

SRR type information (SRR Status) is composed of 4 bits (b60 to b63), and is used as information indicating the characteristics of the SRR. For example, it may indicate whether the SRR is an open SRR or a closed SRR, or it may indicate that the SRR is the start SRR of the session.

The start address of SRR of the corresponding SRR means the start position information of the SRR, and the first physical sector number of the SRR of the corresponding SRR physically formed in the disk will correspond thereto.

The last address information (LRA of SRR) in which data is recorded in the SRR is information indicating the last position where the user data is recorded in the SRR. In particular, in the case of open SRR, additional recording is possible since additional recording is possible. In general, the cluster immediately after the LRA corresponds to this, and this is called a next writable address (NWA). After all, open SRR means additionally recordable SRR with NWA, and closed SRR can not be rewritten as SRR without NWA because additionally impossible recording.

Therefore, the recording / reproducing apparatus (Fig. 12) can confirm the position and the NWA of the open SRR in the disc from the SRR information, thereby enabling additional recording and the like effectively on the disc.

<SRR Type>

In the present invention, the SRR is an area created for recording in the disc. The type of the SRR can be defined in various ways as necessary or according to the progress of recording. Hereinafter, the types of the SRR newly defined in the present invention will be described with reference to FIGS. 2A to 3C. When described in detail with reference to as follows.

First, FIGS. 2A to 2D illustrate types of open SRRs of SRRs. As described above, an open SRR means an SRR that can be recorded in a corresponding area, and the possibility of recording means that it has NWA information. do. An open SRR is generated by a user or a recording / playback apparatus (Fig. 12) for recording on a disc, and is changed to a closed SRR by a close command.

FIG. 2A shows an Invisible SRR first among open SRRs, which is an SRR that is always formed in the outermost circumferential section of a disc or an initial blank disc, and means an area where recording has not yet been performed. That is, the invisible-SRR has only a start address defined and no end of the area, and as the recording is not performed yet, the NWA becomes the same value as the start address.

FIG. 2B illustrates Incomplete SRR as the second of open SRRs, and indicates an area in which some recording is performed in the Invisible SRR state of FIG. 2A. Incomplete-SRR, like Invisible SRR, defines only the start address and no end of the area. However, as some recordings are performed, LRA means the last position where normal data is recorded. Therefore, the NWA is the information corresponding to the next location of the LRA.

FIG. 2C is the third of the open SRRs, showing an empty SRR, unlike the Invisible SRR and Incomplete SRR of FIGS. 2A and 2B. Refers to the SRR formed for recording in the intermediate region rather than the outer periphery. That is, the SRR corresponds to the case in which the host or the user has formed an open SRR for recording and has not yet performed the recording. The SRR has a start address and an end address but is not yet recorded. NWA is the same value as the start address.

FIG. 2D shows a partial recorder-SRR (Partially recorded SRR) as the last fourth of the open SRRs, and means an SRR in which some recording is performed in the empty SRR state of FIG. 2C. Therefore, it has a start position and an end address, and as some recordings are performed, the LRA means the last recorded position, and the NWA becomes information corresponding to the next position of the LRA.

3A to 3E illustrate the types of closed SRRs in the SRR. As described above, the closed SRR means an SRR that is impossible to record in a corresponding area, and the impossible that recording does not have NWA information. In addition, the closed SRR may be generated after all of the corresponding areas have been recorded, and may be forcibly closed even if a recordable area remains in the corresponding area by a close command of a user or a host.

FIG. 3A shows the first of the closed SRRs, which is an empty SRR, and in the open empty SRR state of FIG. 2C, the closed SRR is closed by a close command without recording user data. do. Generally, in this case, even if no display (recording) is performed on the SRR, the SRR is excluded from the open SRR list by the "List of opened SRRs" field in the SRR information header, thereby automatically recognizing that it is a closed SRR. .

However, there may be a case where the corresponding SRR information is lost due to a power failure or a disk damage. In this case, the open empty SRR of FIG. 2C and the closed empty SRR of FIG. 3A cannot be distinguished. A problem arises that is missing. Therefore, in the present invention, when the open empty SRR is changed to the closed empty SRR by the close command, the changed fact is displayed in the corresponding area.

In other words, part of the recordable area of the open empty SRR was recorded as dummy data to indicate that the area was closed. The dummy data to be recorded is meaningless data arbitrarily generated by the recording / reproducing unit (FIGS. 12 and 10) in the recording / reproducing apparatus (FIG. 12) and will be used only as information indicating that the corresponding SRR is closed. There is also an advantage that the recording time can be further shortened than when recording and receiving specific data from (20) (also called "automatic padding").

In addition, the size of the dummy data to be recorded may be selectively determined by the recording / reproducing apparatus (Fig. 12), but preferably only the minimum recording unit (1 cluster) is recorded so that the entire remaining area is dummy data. In this case, the recording time is shorter than when recording. Accordingly, FIG. 3A shows that recording of the entire area as dummy data is an option of the recording / reproducing apparatus (FIG. 12).

FIG. 3B shows a closed partial recorder-SRR (Partially recorded SRR), which is the second of the closed SRRs, and means an SRR closed by a close command in the open partial recorder-SRR state of FIG. 2D. . In this case as well, a part of the data is recorded in the recordable area as dummy data for the same reason as in FIG. The following detailed description is the same as in FIG. 3A and will be omitted.

3C shows a complete SRR (Complete SRR), which is the third of the closed SRRs, and indicates an SRR in which normal user data recording is completed until the end of the corresponding area. This is a case where the entire SRR has been recorded, so as shown in FIGS. 3A and 3B, the SRR will not be additionally recorded by the dummy command.

That is, in the present invention, in determining the type of SRR, when there is an area that is not recorded when the open SRR is changed to the closed SRR by the close command, a part of the area (or optionally the entire area) is dummy data. It can be seen that even if the SRR information is lost and the recording state of the disc is not accurately understood, the recording is possible.

<SRR Information Recording Method According to SRR Type Created in Disk>

4 to 9B, the actual SRR type (Figs. 2A to 3C described above) is generated on the disc, and the SRR information is recorded as the recording state information indicating the recording state of the disc. It will be described in detail by dividing into steps.

In addition, when the session is briefly described, as described above, the term is used to collectively apply the concept used to distinguish the SRRs for compatibility with the playback-only standard, wherein the SRR is composed of at least one. There are three types of sessions related to the present invention, the first being an empty session consisting only of Invisible SRR and the second being at least one excepting Invisible SRR. Incomplete sessions with open SRRs. Third, complete sessions with closed SRRs only. That is, the Incomplete session is changed to a complete session by the session close command, and all open SRRs in the complete session are changed to closed SRRs.

Fig. 4 is a first step (step1), which means a first blank disc which can be recorded in the whole area, and the portion indicated by the arrow indicates the "NWA" position, where the initial position of the disc is NWA. In this state, only one SRR exists in the disk, which becomes an Invisible SRR as shown in FIG. 2A. Therefore, the session is in the initial state of the disk where only one empty session exists. This is a case where a blank disc is not yet recorded with the SRR information.

FIG. 5A shows a second step (step2) in which a part of recording on the blank disc of FIG. 4 is completed but the session is not closed. In this state, only one SRR exists on the disc. Incomplete SRR # 1, and a session has only one Incomplete session.

FIG. 5B shows a method of recording a disc recording state as shown in FIG. 5A as SRR information in a management area of the disc. For convenience of description, only the important part of the disc structure and the SRR information structure as shown in FIG. Briefly shown. That is, the SRR information is recorded in the in-disk management area (PTDMA0), and the temporary defect list (TDFL) and the temporary disk definition structure (TDDS) information are not shown, and the SRR information includes the "List of opened SRRs" field in the header. Only "SRR entry" is shown. In the disc recording state of FIG. 5A, since there is one open SRR in the entire disc area, the corresponding SRR number is recorded in the "List of opened SRRs" field (SRR # 1), and only one entry exists in the SRR entry. .

FIG. 6A is a third step (step3), in which the session close command is executed in the second step (FIG. 5A). By the session close command, an area where data is previously recorded is separated into an independent closed SRR, and a new session is created. That is, the portion of which recording is completed in the second step becomes a complete SRR # 1, and the corresponding region generates a complete session. In addition, the area left unrecorded becomes an Invisible SRR # 2 as shown in FIG. 2A, and the area becomes an empty session.

FIG. 6B shows a method of recording the disc recording state as shown in FIG. 6A as SRR information in the management area of the disc, and is named SRRI # 2 since it is SRR information recorded second in the management area. In the disc recording state of FIG. 6A, since there is one open SRR and one closed SRR in the entire disc area, the corresponding open SRR number is recorded in the "List of opened SRRs" field (SRR # 2), and the SRR entry is recorded in the SRR entry. Record the information for both entries. In the drawing, the blacked SRR entry is illustrated as meaning a closed SRR entry.

FIG. 7A shows a fourth step (step4), in which the second open SRR is additionally reserved for new recording in the third step (FIG. 6A). Thus, the newly created open SRRs are empty SRRs (Empty SRR # 2 and # 3), respectively, and have NWA. The session is also changed from an empty session to an incomplete session.

FIG. 7B shows a method of recording the disc recording state as shown in FIG. 7A as SRR information in the management area of the disc, and is named SRRI # 3 because it is the third SRR information recorded in the management area. In the disc recording state of FIG. 7A, since three open SRRs exist in the entire disc area and one closed SRR exists, the corresponding open SRR number is recorded in the "List of opened SRRs" field (SRR # 2, # 3, # 4), SRR entry records the corresponding information for each of the four entries. Likewise, blackened SRR entries are shown as meaning closed SRR entries.

FIG. 8A shows a state in which data has been recorded in the first empty SRR and invisible SRR in the fourth step (step 5A) in the fourth step (FIG. 7A). Thus, the first empty SRR is changed to partial recorder SRR (Partially recorded SRR # 2), the invisible SRR is changed to Incomplete SRR # 4, and is open. Empty SRR # 3 has no change.

FIG. 8B shows a method of recording the disk recording state as shown in FIG. 8A as SRR information in the management area of the disc. Since it is the fourth SRR information recorded in the management area, it is named SRRI # 4. In the disc recording state of FIG. 8A, since three open SRRs exist in the entire disc area and one closed SRR exists, the corresponding open SRR number is recorded in the "List of opened SRRs" field (SRR # 2, # 3, # 4), SRR entry records the corresponding information for each of the four entries. In particular, in this step, the number of SRR entries and the location of open SRRs are the same as in the case of FIG. 7B, but since the recording is performed in a specific open SRR, the "LRA" information in the open SRR entry where the recording is performed is changed, Therefore, the additional recordable NWA position is also changed. Likewise, blackened SRR entries are shown as meaning closed SRR entries.

Fig. 9A shows a sixth step (step6) in which the session close command is executed in the fifth step (Fig. 8A), but dummy data is recorded and closed in the additionally recordable position of the open SRR.

That is, an area in which data is previously recorded by the session close command becomes an independent complete session, and all SRRs included in the complete session are changed to closed SRRs. In other words, a partial recorder SRR (Partially recorded SRR # 2), an empty SRR # 3, and a complete SRR # 4 are generated as a closed SRR in a newly created complete session. Will be.

In particular, although SRR # 2 and SRR # 3 have additional recordable areas, they are changed to closed SRR by a close command, so that dummy data is recorded in some areas as described above. However, even in this case, the "LRA" information recorded in the SRR entry means the last position where the actual user data is recorded, and the dummy data part has no effect on the "LRA" positioning.

The remaining outermost SRR is an open SRR, which becomes Invisible SRR # 5, and the session becomes an empty session.

Fig. 9B shows a method of recording the disc recording state as shown in Fig. 9A as SRR information in the management area of the disc, and is named SRRI # 5 because it is the fifth SRR information recorded in the management area. In the disc recording state of FIG. 9A, since one open SRR exists and four closed SRRs exist in the entire disc area, the corresponding open SRR number is recorded in the "List of opened SRRs" field (SRR # 5). In the SRR entry, the corresponding information is recorded for each of the five entries. In particular, even in the case of SRR # 2 and SRR # 3 in which dummy data is added by the close instruction, the "LRA" information in the SRR entry records the last position where the actual user data is recorded. Likewise, blackened SRR entries are shown as meaning closed SRR entries.

As can be seen from Fig. 4 to Fig. 9B, the SRR information is information indicating the recording state on the current disc. When the disc is loaded, the recording / reproducing apparatus (Fig. 12) is the latest recorded in the management area. The SRR information (SRRI # 5 in the above example) should be checked, and since only the latest SRR information accurately indicates the final recording state of the disc, the position of the additionally recordable SRR can be confirmed.

However, the power may be suddenly turned off while the disk is in use, or the disk may be damaged and the latest SRR information may not be read. In this case, the final recording state of the disk should be inferred using the latest SRR information from the normal SRR information. do. In the present invention, since the SRR type is defined so that the final recording state of the disc can be inferred even in the above-described loss situation, the SRR information and the disc recording state can be easily restored, which will be described in detail below. do.

<Restoring SRR information and restoring the last recorded state of disk>

10, 11A, and 11B relate to a method of recording an optical disc of write once type according to the present invention. In particular, in the case where the latest SRR information is lost, the final recording state of the disc is inferred and used for recording and reproducing. It is about.

The loss of the latest SRR information may be the case that the SRR information is determined to be a defective area, and the recorded information is unreliable. If the latest SRR information is lost (Damaged), it means that the final recording state of the disc cannot be confirmed, and therefore the disc itself may not be used anymore in the worst case since the recordable location is not known. That is, the present invention relates to a method for correctly restoring the final recording state of a disc even in the above case.

Fig. 10 is a flowchart of a method for recording an optical disc of write once type according to the present invention. When the disc is loaded, the latest SRR information (SRRI) recorded in the management area is read, and then the corresponding SRR information is normal or lost. Check whether the information (S10).

If the latest SRR information is not lost in this step (Non-Damaged), as a normal step, the final disc recording state is checked from the SRR information (S21), and recording is performed only in the additional recordable area therefrom, Playback is performed in the area (S22).

If the latest SRR information is lost in the step (Damaged), first check the latest SRR information from the normal SRR information (S31), and infer the final disk recording state from it (S32), and infer the final Recording is performed only in the additionally recordable area from the disc recording state, and reproduction is performed in the already recorded area (S34). In addition, the latest SRR information may be restored and recorded in the management area on the basis of the inferred final disc recording state (S33). However, the above step S33 may be omitted, and the recording state of the newly changed disc after the recording / reproducing step S34 may be recorded in the management area as SRR information.

11A and 11B illustrate a process of inferring and restoring a final disc recording state when the latest SRR information is lost. For convenience of description, the SRR information recording method described above with reference to FIGS. 4 through 9B. Will be described with an example.

Fig. 11A shows the SRR information last recorded in the disk management area PTDMA0, and SRRI # 5 will be the latest SRR information in the normal state. However, if SRRI # 5 is lost, the recording / reproducing apparatus (Fig. 12) reads out the latest SRR information from the lossless SRR information, which becomes SRRI # 4, for example.

That is, the actual final recording state of the disc (Fig. 9A, step 6) can be confirmed by SRRI # 5, but the information that can be confirmed by the recording / playback apparatus (Fig. 12) is SRRI # 4, which is different from the final recording state of the disc. Will do. Therefore, in order to restore the disc final recording state, it is necessary to infer by comparing SRRI # 4 information with the actual final recording state of the disc, which will be described below.

First, the recording / playback apparatus (Fig. 12) checks the position and LRA information of the open SRR from SRRI # 4. In this example, it is confirmed from SRRI # 4 that there are three open SRRs (SRR # 2, # 3, # 4), and the LRA is used to verify whether the actual position is the open SRR. That is, only the open SRR is verified, and the position already recorded as the closed SRR is not verified. The reason is that once the SRR is changed to the closed SRR, it cannot be returned to the open SRR. Therefore, the final SRR information can be restored by confirming that the open SRR is changed to the closed SRR.

That is, in the case of SRR # 2 and SRR # 3 recognized as the open SRR from the SRR information SRRI # 4, it can be confirmed that dummy data is recorded after the LRA position as shown in FIG. 9A (actual disc recording state). From this, the recording and reproducing apparatus (Fig. 12) can infer that the corresponding SRR has been changed to the closed SRR. In addition, SRR # 4 recognized as an open SRR confirms that dummy data is not recorded after the LRA position from FIG. 9A (actual final disc recording state). From this, SRR # 4 is inferred as open SRR even in actual disc recording state. It can be seen that since the LRA is a recordable area. At this time, the recording / reproducing apparatus (Fig. 12) may infer that SRR # 4 has already been recorded to close SRR, and infers only the recordable area as an open SRR (in this case, an invisible SRR as shown in Fig. 2A). The reason is that since the information required by the recording / reproducing apparatus (Fig. 12) is additionally recordable position information (NWA), there is no problem because the position of the NWA does not change even if inferred as described above.

Fig. 11B shows the result of restoring the latest SRR information SRRI # 5 through the above analogy, and the result will be exactly the same as representing the final recording state of the actual disc. Therefore, the recording / reproducing apparatus (Fig. 12) records the latest SRRI # 5 restored as necessary in the management area again (in this case, it is SRRI # 6 since it is the eighth SRRI), and then performs recording only in the additional recordable area. do.

Fig. 12 relates to a recording / playback apparatus for an optical disk to which the present invention is applied, and the recording / playback apparatus includes a recording / playback section 10 for performing recording / reproducing on an optical disk and a control section 20 for controlling the recording / playback section. The control unit 20 issues a recording or reproducing command to the recording / reproducing section 10 to the specific area, and the recording / reproducing section 10 performs recording / reproducing to the specific area according to the command of the control section 20. FIG. Specifically, the recording and playback section 10 includes an interface section 12 for communicating with the outside, a pickup section 11 for directly recording or reproducing data on an optical disc, and a playback signal received from the pickup section. A data-processor 13 for restoring a signal value or modulating a signal to be recorded into a signal recorded on an optical disk, and transferring the data-processor 13 to pick up a signal accurately from the optical disk or to accurately record a signal on the optical disk. A servo unit 14 for controlling the unit 11, a memory 15 for temporarily storing various information and data including management information, and a microcomputer 16 for controlling the components of the recording / reproducing unit. have.

Referring to the recording and reproducing process of the optical disc according to the present invention in detail, first, when the optical disc is loaded into the recording and reproducing apparatus, the microcomputer 16 is recorded in a predetermined management area, for example, a temporary defect management area (TDMA) in the optical disc. If the pickup 11 is controlled to read the latest SRR information, and it is determined whether the corresponding SRR information is lost, and it is determined that the latest SRR information is lost, as described above with reference to FIGS. 10, 11a, and 11b. Likewise, the latest SRR information is inferred and restored from the lossless SRR information, which makes it possible to restore the latest SRR information by checking the dummy data recorded in the disk when the open SRR is changed to the closed SRR by the close command. As described above.

When the latest SRR information restored as described above or the latest SRR information is not lost, from the latest SRR information itself, the recording / playback unit 10 checks the position of the additionally recordable open SRR and performs recording. When the close command of the control unit 20 is received after the predetermined recording operation, the recording / playback unit 10 records the dummy data in some (or all areas) of the additional recordable areas remaining in the open SRR to indicate that the change has been made to the closed SRR. After that, the recording state of the changed disc is recorded as new (latest) SRR information in the management area, so that even if any recording / reproducing apparatus is loaded again, the recording state of the final disc is lost even if the latest SRR information is lost. Can be confirmed accurately.

As mentioned above, preferred embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.

According to the present invention, the recording method of a write once type optical disc according to the present invention defines a new SRR type in consideration of not only accurately representing the recording state of the disc but also restoring lost SRR information in the future, and using the same. By accurately deriving and recording the recordable area, it is possible to effectively record and manage the optical disc.

Fig. 1 shows the overall structure of a writeable optical disc of the present invention and a method of recording SRR information as disc recording state information.

2A to 2D show the types of opened SRR of the write once optical disc to which the present invention is applied;

3A to 3C show a closed SRR type of a write-once optical disc to which the present invention is applied;

4 to 9b illustrate an example of a step-by-step method of generating an SRR in a writeable optical disc to which the present invention is applied and recording it as SRR information.

10 shows a recording method using SRR information of an optical disc of write once type according to the present invention;

11A and 11B are diagrams for explaining a method of restoring the latest SRR information in the write once optical disc of the present invention;

Fig. 12 shows a recording and reproducing apparatus of the write once optical disc of the present invention.

-Description of the main parts in the drawing-

10: recording and playback section 20: control section

16: micom 15: memory

Claims (21)

In an optical disc of recordable type, which can be divided into a recordable area and a non-recordable area, When changing the additionally recordable area into a non-recordable area, dummy data of a certain size is recorded after the last recorded area in the additionally recordable area to indicate that the additionally recordable area has been changed to the non-recordable area, And recording status information of the disc including the changed area in a management area of the disc. The method of claim 1, And the additionally recordable area means an open SRR. The method of claim 1, And the area in which the additional recording is impossible means a closed SRR. The method of claim 1,       And a predetermined size recorded in the dummy data is a minimum recording unit. The method of claim 1,       And a predetermined size recorded in the dummy data is at least one cluster or more. The method of claim 1, And a predetermined size recorded in the dummy data means the size of the entire remaining area which is not recorded in the additionally recordable area. The method of claim 1, And the recording state information includes the start position information of the additionally recordable area and the position information of the last recorded area (LRA) in the additionally recordable area. When the disc is loaded, reading out the latest recording state information recorded in the management area, and then checking whether the latest recording state information is lost; If the latest recording state information is lost, inferring the final recording state of the disc from previously recorded unlost recording state information;  And recording in the additionally recordable area according to the final recording state of the inferred disc. The method of claim 8,       Inferring a final recording state of the disc from the previously recorded non-lost recording state information may include: an area designated as an additional recordable area in the previously recorded non-lost recording state information is an actual additional recordable area in the disc. A recording method of an optical disc of write once type, characterized in that to confirm the recognition. The method of claim 9, The recording area is designated as an additional recordable area in the previously recorded non-lost recording state information. However, when dummy data is recorded in the corresponding area of the actual disc, the recording is once made. Possible optical disc recording method. The method of claim 8, And when the latest recording state information is not lost, checking the final recording state of the disc from the latest recording state information. The method of claim 8, Inferring the final recording state of the disc from the previously recorded non-lost recording state information, and recording the final recording state of the inferred disc as recording state information in the management area. Possible optical disc recording method. The method of claim 8, And the recording state information is SRR information. The method of claim 13, The SRR information is recorded by allocating one entry for each SRR in the disk, and in one entry, information indicating the first address of the SRR and information indicating the last address where data is recorded in the SRR are included. A recording method of an optical disc of write once type, characterized in that for recording. After creating a separate area for recording on the disc, in closing the area so that it no longer writes to that area, Receive a close command for a specific area, Indicates that the area is closed to a recordable area remaining in a specific area after receiving the close command, A method for closing an area on a writeable optical disc, characterized in that the recording state information records that the specific area is closed in a disc management area. The method of claim 15, The method for indicating that the closed area is a part of the recordable area remaining in the specific area is recorded as dummy data. A data area that can be divided into an additional recordable area and a non-addable area; When the additional recordable area is closed to the non-recordable area, it indicates that the area is closed to a recordable area remaining in the additional recordable area, and the recording state information in the disc including the closed area. And a management area for recording data. The method of claim 17, The write once optical disc is a Blu-ray disc (BD-WO). The method of claim 17, And the management area is provided both in the data area and outside the data area. A control unit for generating a separate area for recording in a specific area of the disk and transferring a recording command, and for transmitting a command to close the corresponding area when the recording is no longer performed in the corresponding area; After receiving the close command of the controller, if a recordable area remains in the area, some of the area is recorded as dummy data, and recording state information indicating that the area is closed is recorded in the management area of the disc. An optical disc recording and reproducing apparatus, characterized by comprising a recording and reproducing section. When the disc is loaded, after reading the latest recording state information recorded in the management area, it is checked whether or not the latest recording state information is lost. If the latest recording state information is lost, the previously recorded state is recorded. A recording / playback unit for inferring the final recording state of the disc from the recording state information which is not lost;  And a control unit which transmits a recording command to an additional recordable area in the disc, based on the final recording state of the inferred disc.