KR20050111047A - Method for recording management information on optical disc write once - Google Patents

Abstract

The present invention relates to an optical disc and a method of recording management information of an optical disc, and a recording and reproducing method and apparatus using the same, which allocates an open SRR for recording on a disc, and records when the recording in the open SRR is terminated. Pad unrecorded sectors included in the last cluster to be terminated with dummy data, set identification information identifying the padding for each sector in the cluster, and, in closing the open SRR, a recordable cluster remains in the SRR. In this case, the recordable cluster may be padded or not padded to close SRR, and each sector in the padded cluster may have identification information indicating that the padded sector is a padded sector, thereby having a new physical structure. Efficient recording and playback even on recordable optical discs It is possible.

Description

Recording method of optical disc management information which can be recorded once and method and apparatus for recording and reproducing optical disc using same {Method for recording management information on optical disc write once}

The present invention relates to a method of recording management information of an optical disc, which can be recorded once, and a recording and reproducing method and apparatus using the same.

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.

Various standard proposals related to Blu-ray Discs are being prepared, and standard proposals for Blu-ray Discs (BD-WOs) that can be written once are prepared following the rewritable Blu-ray Discs (BD-RE).

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 way to record the information.

The information indicative of the recording state of the disc is a kind of information indicating the use state of the current disc, which allows a host or a user to easily find a recordable area on the write-once optical disc. In the conventional recordable optical discs, information indicating the recording state is used under various names. In the CD series, the track information is used, and in the DVD series, it is expressed as RZone or fragment. It was.

In the present invention, as a meaning applied to the continuous recording mode of the Blu-ray Disc BD, information indicating the recording state of the disc is collectively referred to as "SRR information (Sequential Recording Range Information: hereinafter referred to as" SRRI "), In addition, when a plurality of areas are formed in the disc and recording is performed in the corresponding area, each of the areas formed in the disc will be referred to as "SRR (Sequential Recording Range)", which will be understood as its meaning regardless of the name. Details of "SRR" and "SRR information (or SRRI)" in the present invention will be described later in the constituent parts of the present invention.

Therefore, an efficient management information recording method corresponding to the recording state of a disc in a high density optical disc is desperately required. In particular, it must be provided as standardized information to ensure mutual compatibility.

Accordingly, the present invention has been made in view of the above circumstances, and provides a method of recording disc management information on an optical disc that can be recorded once, and particularly, a method of efficiently recording and managing recording state information of a disc. Its purpose is to provide the following technical problems.

To provide a way to define new SRR types and record them in SRRIs,

Further, an object of the present invention is to provide a method of recording an SRRI as a disc recording state information, a method of restoring an SRRI, and a related recording and reproducing method and apparatus, which are applicable to a write-once optical disc on which physical defect management is performed.

In order to achieve the above object, the method of recording management information of an optical disc of write once type according to the present invention includes generating an open SRR for recording in the disc, and when the recording in the open SRR ends, it is included in the last cluster which has been recorded. Padding the unrecorded sector with dummy data and recording identification information identifying the padding in a specific area of the disc.

In addition, another management information recording method for a write-once optical disc according to the present invention, in closing an open SRR, if a recordable area remains in the SRR, the recordable area is padded with or without padding. And padding identification information according to the presence or absence of the padding is recorded.

In addition, the recording method of the write once optical disc according to the present invention allocates an open SRR for recording in the disc, and when the recording in the open SRR is completed, unrecorded sectors included in the last cluster where recording is completed as dummy data. Padding, identification information identifying the padding is set for each sector in the cluster, and when closing the open SRR, if a recordable cluster remains in the SRR, the recordable cluster is padded or closed without padding. Change to SRR, wherein each sector in the padded cluster records identification information indicating a padded sector;

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 recording / reproducing apparatus of the write once optical disc according to the present invention, after allocating an open SRR for recording in the disc, transmits a recording command, but closes the corresponding area when no further recording is performed in the corresponding area. a control unit that sends a command to close,

When recording is performed in the open SRR according to a recording command of the controller, when recording is completed, padding unrecorded sectors included in the last cluster whose recording is completed with dummy data, and identification information identifying whether the padding is performed is performed for each sector in the cluster. If a recordable cluster remains in the SRR according to the close command of the control unit, the recordable cluster is changed to a closed SRR with or without padding, and each sector in the padded cluster is changed. And a recording / playback section for recording identification information indicating that the sector is a padded sector.

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.

The term "SRR" used (or used) in the description of the present invention in relation to this is a term meaning a divided area for recording on a disc, and "SRR information (or SRRI)" indicates information for indicating a recording state of a disc. The term "padding" refers to the term "padding", which means that the unrecorded area in the SRR is not normal user data or dummy data or zero at the request of the user or by the judgment of the recording / playback apparatus (Fig. 14). The term means to record the value as). In addition, "session" is to be understood that the term is composed of at least one SRR, the term used to collectively apply the concept used to distinguish the SRR for compatibility with the reproduction-only standard.

Fig. 1 shows a method of recording a writeable optical disc and disc management information to which the present invention is applied.

The write-once optical disc of Fig. 1 shows, for example, a single layer disc having one recording layer. First, a spare area (ISA0 / OSA0) for alternately recording a defective area for physical defect management It is understood that a temporary disc management area (hereinafter referred to as "TDMA") for managing the information of the defective area is required. In general, rewritable optical discs have a limited size of defect management area (hereinafter referred to as " DMA ") so that a large amount of DMA can be repeatedly written and erased in this area. Although it is not necessary, in the case of an optical disc that can be written once, once a recorded area cannot be used for recording again, a larger size management area is required for defect management, and when an optical disc that can be written once is no longer recorded Since the process of transferring the final TDMA information to the DMA may be necessary, this is named TDMA (Temporary DMA) to distinguish it from DMA.

1 shows that there are two types of TDMAs, firstly, TDMA0 allocated to a fixed size in the lead-in area, and secondly, TDMA1 allocated to the size of the spare area in the outer spare area OSA0. The size P of TDMA1 is, for example, P = (N * 256) / 4, so that about one quarter of the total outer spare area OSA0 size is suitable.

Each TDMA0 and TDMA1 includes a temporary defect list information (hereinafter referred to as "TDFL") and a temporary disc definition structure (hereinafter referred to as "TDDS") information in one recording unit (BD-WO). In this case, one cluster may be recorded (TDFL + TDDS), or SRR information and TDDS may be recorded in another recording unit (SRRI + TDDS).

Here, the TDFL is a process of replacing a spare area with a defective area when a defective area is generated in the data area. The TDFL refers to information managing a series of processes as a defective area list, and 1 to 4 clusters according to the size of the defective area list. Write the size of. SRRI is information indicating whether a specific area of a disc is recorded or unrecorded. In particular, SRRI may be applicable when the disc is a continuous recording method. In addition, the TDDS is recorded in the last sector of the 32 sectors in one cluster, and important information for general management and defect management of the disk is recorded so that it is always recorded at the last time when updating management information in the TDMA.

The present invention relates to a method of recording disc recording status information applied to a new high density optical disc such as BD-WO. In particular, the present invention uses SRRI as recording status information and displays various types of SRR to be defined in FIGS. 2A to 3E. The detailed structure of the SRRI will be described later with reference to FIGS. 5A to 6C.

In this regard, the present invention has the purpose of distinguishing various types of SRRs formed in a disc, and utilizing them for recording and reproducing an optical disc. The present invention hereinafter newly defines the types of SRRs and identifies distinct types of SRRs. It will be described in detail how to organize the information.

2A to 2D illustrate types of open SRRs among SRRs. Open SRR means an SRR that can be recorded in the corresponding area, and being capable of recording means having "NWA (Next Writable Address)" information. Therefore, an open SRR means an SRR having NWA information, and an SRR that cannot be recorded without having an NWA is called a closed SRR. The closed SRR will be described with reference to FIGS. 3A to 3E.

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. Invisible SRR means that only the start address is defined and the end position means the end of the user data area. As the recording has not been performed yet, "LRA" has a value of "zero" and thus NWA has a start position ( start address).

FIG. 2B illustrates an Incomplete SRR as the second of the open SRRs, and represents an SRR in which some recording is performed in the Invisible SRR state of FIG. 2A. That is, like Invisible SRR, Incomplete SRR defines only the start address and the end position means the end of the user data area. However, as some recording is performed, the LRA is the last time that normal data is recorded. This means the location, so the NWA is the information corresponding to the next location in the LRA.

In this regard, in the open SRR, an enlarged view of the dotted box portion of FIG. 2B to specifically describe the relationship between "LRA" and "NWA" in relation to padding when some recording is performed in the SRR, 2b is shown at the bottom.

That is, since the LRA means an area in which the actual user data is recorded, if the user data is recorded only in some sectors in one cluster composed of 32 sectors, the physical sector number (PSN) of the last sector in which the user data is recorded is "LRA". Becomes However, since the recording unit of the Blu-ray Disc BD is a cluster, " NWA " indicating an additional recordable area will be the PSN of the head sector of the cluster that follows.

Therefore, in the case where only some sectors in the cluster are recorded and recording is completed, the remaining unrecorded sectors in the cluster must be padded with dummy data, and in this case, padding is generally performed with a "zero" value.

Therefore, it will be apparent that the above padding is not necessary if all user data has been recorded up to the last sector of a particular cluster.

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. In other words, this is the case when the host or user has not yet performed the recording after the open SRR is formed for the recording. The LRA has a start address and an end address but is not yet recorded. Will be "zero" and NWA will be the same 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.

In this regard, in the open SRR of FIG. 2D, the dotted box portion of FIG. 2D is enlarged to specifically explain the relationship between “LRA” and “NWA” in relation to padding when some recording is performed in the SRR. The drawings are shown in the lower part of FIG. 2D, and the detailed description thereof will be omitted below since they are the same as in the case of FIG. 2B.

Accordingly, the open SRR of the present invention can be divided into the open SRRs (FIGS. 2A and 2C) which have not been recorded yet, and the open SRRs (FIGS. 2B and 2D) in which the partial recording is completed in the SRRs. The open SRR (Fig. 2B, Fig. 2D), in which the partial recording is completed in the SRR, is distinguished into a case where padding is performed after "LRA" and when no padding is performed.

In addition, the number of open SRRs is limited due to the difficulty of management in a recordable disc once. For example, in the BD-WO of the present invention, up to 16 open SRRs can exist. Information on the location and number of open SRRs in the disc can be identified by the "List of opened SRRs" field and the "Number of opened SRRs" field in the aforementioned SRRI header. This will be described later in detail in the SRRI structure description of FIGS. 5A to 6C.

3A to 3E show the types of closed SRRs in the SRRs. Closed SRR means SRR that can not be recorded in the corresponding area, and impossible to record means that it does not have "NWA (Next Writable Address)" information. 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 empty SRR of the closed SRR, which means the SRR closed by the close command without writing in the open empty SRR state of Fig. 2C. Is an empty SRR, and FIG. 2C is an open empty SRR.

FIG. 3B shows a Partially Recorded SRR (Partially Recorded SRR) as the second of the Closed SRRs, and means the SRR closed by the Close command without recording in the Open Partially Recorded SRR state of FIG. 2D. . Accordingly, FIG. 3B becomes a closed partial recorder-SRR (Partially recorded SRR), and FIG. 2D becomes an open partial recorder-SRR (Partially recorded SRR).

FIG. 3C illustrates a complete SRR (the third complete SRR) in which normal user data is recorded or dummy data is padded to the end of the corresponding area. This is an SRR that exists only at close.

FIG. 3D is a fourth type of closed partial recorder-SRR (closed partial recorded SRR) of the closed SRR, but the open partial recorder-SRR of FIG. 2D is specified in some recordable areas after LRA upon closing. It means a closed SRR after padding with dummy data. At this time, it is possible to pad the entire recordable area after the LRA with dummy data, or only a part of the area (for example, one cluster) with the dummy data. In addition, when padding some areas, it is also possible to record specific ASCII characters to indicate that the SRR is closed instead of the dummy data, in which case the specific character code is the corresponding SRR, for example "CLSD". It will be a character to indicate that it is closed.

FIG. 3E is the last fifth of the closed SRRs, which is a type of closed SRR, but when the open empty SRR of FIG. 2C is closed, specific dummy data is stored in some recordable areas after the LRA. It means a closed SRR after padding. At this time, it is possible to pad the entire recordable area after the LRA with dummy data, or only a part of the area (for example, one cluster) with the dummy data. In addition, when padding some areas, it is also possible to record specific ASCII characters to indicate that the SRR is closed instead of the dummy data, in which case the specific character code is the corresponding SRR, for example "CLSD". It will be a character to indicate that it is closed.

In this regard, in the closed SRRs of FIGS. 3D and 3E, if all of the end addresses of the SRRs are padded with dummy data, in this case, the SRRs will be SRRs having the same concept as the complete-SRR described in FIG. 3C. .

That is, in the present invention, in determining the type of the closed SRR, when the open SRR is changed to the closed SRR by the close instruction, the area remaining unrecorded in the SRR is closed without padding (FIGS. 3A and 3B). ) And padding (padding) to close the case (Fig. 3d, 3e) is characterized by defining.

In addition, in the present invention, when closing the SRR, it is possible to selectively close the padding without padding and to close the pad after padding specific data.In the case of the current Blu-ray disc, padding of the unrecorded area in the SRR is required. It is conceived that the recording and reproducing apparatus (Fig. 14) can be selectively performed whether or not padding is possible. There is an effect that the degree of freedom is further ensured, and at the time of padding, the recording / playback section (Figs. 14, 10) in the recording / playback apparatus (Fig. 14) can automatically record specific data, so that the control unit ( It is also possible to solve the time problem when padding is received by receiving specific data from Figs. 14 and 20).

4A and 4B show an example of a method of recording padding identification information when padding dummy data in the open SRR and the closed SRR of a write once optical disc to which the present invention is applied.

That is, FIG. 4A shows a case in which only a part of the area in one cluster is actually recorded with real user data, and padding with dummy data in the rest of the cluster, in the case of an open SRR. The padding identification information Padding_flag for distinguishing a sector in which dummy data is recorded is set as control information in a corresponding cluster.

Therefore, in the case of FIG. 4A, since "sector0 to sector29" is an area where normal user data is recorded, it is set to "Padding_flag = 0b", and "sector30 to sector31" is set to "Padding_flag = 1b" because the dummy data is padded area. Done. In addition, the LRA will indicate the position of "sector29", and the optical recording / reproducing apparatus (FIG. 14) decodes the cluster including the LRA to read out the corresponding "Padding_flag" for each sector, and then the user in the cluster. The sector in which data is recorded and the sector in which dummy data is padded can be identified accurately.

In addition, FIG. 4B illustrates a case in which all of a specific cluster of recordable areas in the SRR are padded with dummy data, particularly when closing the SRR, and padding for distinguishing between the closed SRR without padding and the closed SRR after padding is performed. It shows the identification information (Padding_flag) is set to the control information (control flag) in the cluster.

Therefore, in the case of FIG. 4B, since all cluster areas from "sector0 to sector31" are padded with dummy data, "Padding_flag = 1b" is set for all sectors. As a result, when the optical recording / reproducing apparatus (Fig. 14) decodes the cluster having the padding identification information as described above, the corresponding " Padding_flag " for each sector is read out, and then all sectors in the cluster are dummy data instead of user data. Can correctly identify that is a padded sector.

5 to 6c illustrate the structure of the SRRI of the present invention and information included in the SRRI.

First, Fig. 5 shows the structure of the entire SRRI, and as described above, the SRRI is recorded as management information indicating a disc recording state in TDMA in the optical disc structure of the present invention of Fig. 1.

Related to this, SRRI is composed of three major parts: header which makes it possible to recognize that it is SRRI, list of SRR entries indicating recording status of each SRR, and termination of SRRI. It consists of SRR List Terminator.

The header is located in the head of the SRRI, and the "List of opened SRR" field indicating the position of the open SRR present in the corresponding SRR information, in addition to the "SRRI Structure identifier" field that makes it possible to recognize the SRRI (this is shown in FIG. 6C). It contains more information such as "Number of SRR entries" field indicating the total number of SRRs and "Number of opened SRR" field indicating the number of open SRRs before reading the SRR entry list. The full SRRI will be available at.

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 disk management information, the SRR information is composed of a header, an SRR entry list, and an SRR end indicator, and all of the information will be collectively recorded every update.

FIG. 6A illustrates a list of SRR entries in an SRRI structure. The SRR entry list means that a plurality of SRR entries are collected.

In relation to this, one SRR entry is composed of 8 bytes to express the recording status of each SRR on the disk. The SRR entry includes status information (Status1, 2) of the corresponding SRR and the corresponding SRR. Start address information (Start address of SRR), and last address information (LRA of SRR) in which data is recorded in the corresponding SRR.

FIG. 6B illustrates an SRR entry structure in detail. In particular, "Status1" information is used as information identifying padding, and "Status2" information is used as information identifying session start. Hereinafter, this will be described in detail.

That is, it is used as padding identification information ("P_flag") for identifying padding using 1 bit of the first 4 bits of SRR status information (Status1), and the remaining 3 bits are used to cope with future specification changes. It is left reserved.

In this regard, " P_flag " recorded in an SRR entry is a similar concept to the " Padding_flag " described above in Figs. 4A and 4B, but has a different purpose, i.e. if padding is finally performed on a particular SRR, the corresponding SRR is The information recorded in the SRR entry is " P_flag " to directly indicate that the SRR has been padded.

Therefore, the optical recording / reproducing apparatus (Fig. 14) can easily confirm that padding has been performed on the corresponding SRR from " P_flag " recorded in the SRR entry as management information, and how much padding has been performed since the LRA of the corresponding SRR. As shown in Figs. 4A and 4B, the corresponding cluster is decoded to read and confirm the setting state of the corresponding "Padding_flag" for each sector.

That is, if "P_flag = 1b", the corresponding SRR is defined as padding SRR, and if "P_flag = 0b", the corresponding SRR is defined as meaning padding (SRR).

In addition, the next 28 bits are fields for recording start address information of the corresponding SRR. The address of the start position of each SRR is recorded, and is generally expressed as a "PSN (Physical Sector Number)".

The next four bits are the second SRR status information (Status2), using one of the two bits. It is used as session identification information (Session flag; hereinafter referred to as "S_flag") for identifying whether the corresponding SRR is the start SRR of the session, and the remaining 3 bits are reserved as a reserved for future specification changes.

That is, if "S_flag = 1b", the corresponding SRR means the start SRR of the session, and if "S_flag = 0b", the corresponding SRR is defined as meaning that it is not the start SRR of the session.

In particular, the reason for distinguishing the start of a session by means of "S_flag" is that on discs such as conventional DVDs, a separate additional area (eg "Border-In / Boder-out") is used to distinguish the session. This additional area has a problem of reducing the total recording capacity of the disk. In the present invention, the session structure of the entire disk can be easily identified using only the session identification information ("S_flag") in the SRR entry without allocating the additional area. It is to make it possible.

In relation to this, in the present invention, for convenience of explanation, "P_flag" and "S_flag" are shown as separate "status" information, but it will be apparent that they can be used together in one "status".

The last 28 bits of the SRR entry are fields for recording the last address information (LRA) in which data is recorded in the corresponding SRR. The last 28 bits of the SRR entry record information about the last position of the user data (except padding data) actually recorded in each SRR. . This is the same as described above.

Fig. 6C shows the detailed structure of the "List of opened SRR" field recorded in the header in the SRRI of the present invention, which is information used to confirm the position of the open SRR. Hereinafter, the method of using the field will be described in detail.

That is, in the "List of opened SRR" field, an open SRR entry number is recorded as information about the position of the open SRR entry in the SRR entry.

In the present invention, when a maximum of 16 open SRRs can be present in a disk, an example of recording a position of each open SRR entry through each "opened SRR number" is illustrated.

Therefore, when the optical disc having the structure as in the present invention is loaded, the recording and reproducing apparatus (Fig. 14) should check the recordable position in the disc, which is made possible by checking the NWA value from the open SRR of the present invention.

That is, for recording, the position of the open SRR in the current disk must be checked. All of this information will generally be recorded in the SRR entry. However, in the present invention, since the SRR entry does not contain information identifying whether the SRR is an open SRR or a closed SRR, the optical recording and reproducing apparatus is recorded by recording the position of the open SRR entry in the header portion of the SRRI. Can easily read open SRR entry information.

Therefore, only "SRR number" finally recorded in the "List of opened SRRs" field means that additional recording is possible as an open SRR, and when the open SRR is changed to a closed SRR, the close in the "List of opened SRRs" field is performed. The SRR number changed to SRR is deleted so that it is easy to distinguish between open SRR and closed SRR.

Hereinafter, a method of updating an SRRI indicating a disk recording state according to the present invention will be described. Particularly, dummy data is padded in the SRR, and the padded SRR is used to effectively prevent the lost SRRI even after the SRRI is lost. It will be described how to recover.

7A to 11B are sequential steps of how the actual SRR types (described above with reference to FIGS. 2A to 3E) are generated in the disc and how SRRI is recorded as recording state information indicating the recording state of the disc. It is shown in detail by dividing by (step).

Fig. 7A 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 disc, which becomes Invisible SRR # 1 as shown in FIG. 2A.

Therefore, the session is in the initial state of the disk where only one open session (1) is present. This is a case of blank disk and SRRI has not been recorded yet.

FIG. 7B is a second step (step2), in which a part of recording on the blank disc of FIG. 7A has been completed, but the session has not been closed yet. In this state, only one SRR exists on the disc. It becomes the same Incomplete SRR # 1, and the session is a case where the open session # 1 is maintained.

In this regard, FIG. 7B illustrates a case in which unrecorded sectors in the cluster are padded with dummy data after recording is completed in Incomplete SRR # 1. As described above, the padded sectors are referred to as "padding_flag = 1b". You can see that it is set to.

FIG. 7C illustrates a method of recording a disc recording state as shown in FIG. 7B in the management area of the disc by SRRI. For convenience of explanation, only the important parts related to the present invention among the disc structure and the SRRI structure shown in FIG. It was.

In other words, the SRRI is recorded in the intra-disk management area (TDMA), and the temporary defect list (TDFL) and the temporary disk definition structure (TDDS) information are not shown. In the SRRI, the "List of opened SRRs" field and the "SRR" in the header are shown. Only entries "are shown.

Therefore, in the disc recording state of FIG. 7C, when 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. Done.

In particular, in the SRR entry, as the state information of the corresponding SRR # 1, since padding is finally performed in a partial region, it is set to "P_flag = 1b", and is set to "S_flag = 1b" because it is the start SRR of the open session # 1. .

FIG. 8A is a third step (step3), in which the session close command is executed in the second step (FIG. 7B). 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, in the second step, the recorded portion becomes complete-SRR (complete SRR # 1), and the corresponding region generates a closed session # 1.

In addition, the area left unrecorded becomes an Invisible SRR # 2 as shown in FIG. 2A, and the area becomes an open session # 2.

Fig. 8B shows a method of recording a disc recording state as shown in Fig. 8A in the management area in the disc by SRRI, and is named SRRI # 2 since it is the second SRRI recorded in the management area. In the disc recording state of FIG. 8A, 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 written in the SRR entry. Record the information for both entries. For reference, the shaded SRR entry means a closed SRR entry.

Therefore, the newly created SRR # 2 entry is set to "P_flag = 0b" because no recording has been performed yet, and to "S_flag = 1b" because it is the start SRR of the open session # 2.

FIG. 9A shows a fourth step (step4), in which the second open SRR is additionally reserved for new recording in the third step (FIG. 8A). Thus, the newly created open SRRs are empty SRRs (Empty SRR # 2 and # 3), respectively, and have NWA.

Fig. 9B shows a method of recording the disc recording state as shown in Fig. 9A in the management area in the disc by SRRI, and is named SRRI # 3 because it is the third SRRI recorded in the management area. In the disc recording state of FIG. 9A, since three open SRRs exist in the entire disc area and one close 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.

Therefore, information about the newly created SRR # 2, # 3, # 4 entry is recorded in the SRRI. Since SRR # 2, # 3, # 4 has not been recorded yet, "P_flag = 0b ", and SRR # 2 is set to" S_flag = 1b "because it is the start SRR of open session # 2, but SRR # 3 and # 4 are not set to start SRR of open session # 2 and" S_flag = 0b ". Is set.

FIG. 10A is a fifth step (step5), in which the data has been recorded in the first empty SRR # 2 and invisible SRR # 4 in the fourth step (FIG. 9A). Shows. Thus, the first empty SRR # 2 is changed to partial recorder SRR (Partially recorded SRR # 2), and the invisible SRR # 4 is changed to incomplete SRR # 4. The open empty SRR (Empty SRR # 3) has no change.

In this regard, SRR # 2 is a case where recording is terminated without padding, and SRR # 4 is a case where recording is terminated after padding, and it can be seen that "padding_flag = 1b" is set to a padded sector in SRR # 4. .

Fig. 10B shows a method of recording a disc recording state as shown in Fig. 10A in the management area in the disc by SRRI, and is named SRRI # 4 because it is the fourth SRRI recorded in the management area. In the disc recording state of FIG. 10A, 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. 9B, 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, The identification information P_flag value depending on the presence or absence of padding is different.

That is, since the information on the SRR # 2, # 4 entry where recording is performed will be updated, "P_flag = 0b" is maintained since SRR # 2 has finished recording without padding, and SRR # 4 is the recording after padding. Since it is finished, the setting is changed to "P_flag = 1b".

Fig. 11A shows a sixth step (step6) in which the session close command is executed in the fifth step (Fig. 10A), but the dummy data is padded and closed in the additionally recordable area of the open SRR.

In this regard, the padding may be padded over the entire recordable area in the SRR, which has been discussed above. It is also the same as described above that when padding, specific data (eg, "CLSD" in character code) can be recorded.

That is, the area where data is previously recorded by the session close command becomes an independent closed session # 2, and all SRRs included in the closed session # 2 are changed to the closed SRR. In other words, in the newly created closed session # 2, SRR # 2, # 3, and # 4, which were previously open SRRs, are closed partial recorder-SRR (closed partially recorded SRR # 2) and closed M-SRR ( closed Empty SRR # 3) and complete SRR # 4 (complete SRR # 4).

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 selectively recorded in some areas as described above. Therefore, all sectors in the cluster in which the dummy data is padded (for example, FIG. 4B) are set to "padding_flag = 1b". 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 portion has no effect on the "LRA" positioning.

The remaining outermost SRR # 5 becomes Invisible SRR # 5, and the session becomes a new open session (open session # 3).

Fig. 11B shows a method of recording the disc recording state as shown in Fig. 11A in the management area in the disc by SRRI, and is named SRRI # 5 because it is the fifth SRRI recorded in the management area.

In the disc recording state of FIG. 11A, 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). ), The previous open SRR number (for example, SRR # 2, # 3, # 4 in FIG. 10B) recorded in SRRI # 4 is deleted from the list, so that it can be seen that it has been changed to closed SRR.

The SRR entry records the corresponding information for each of the five entries. In particular, in case of SRR # 2 and SRR # 3 to which dummy data is added by the close instruction, padding is performed, so it is changed to "P_flag = 1b". The "LRA" information in the SRR entry indicates the last position where the actual user data is recorded. Since this is a recording, it has the same value as the previous LRA recorded in SRRI # 4.

In addition, since newly created invisible SRR # 5 has not been recorded yet, "P_flag = 0b" and the start SRR of new session # 3 are set to "S_flag = 1b".

As can be seen from Figs. 7A to 11B, SRRI is information indicating a recording state of a current disc, and when a disc is loaded, the recording / reproducing apparatus (Fig. 14) is the latest SRRI recorded most recently in the management area. (SRRI # 5 in the above example) should be checked, and since only the latest SRRI accurately displays the final recording state of the disc, it is possible to confirm the position of the additionally recordable SRR.

However, the power may suddenly be turned off while the disk is in use, or the disk may be damaged and the latest SRRI may not be read. In this case, the latest SRRI in non-damaged SRRI may be used. The final recording state of the disc must be inferred.

The present invention is characterized in that the padding at the close of the SRR in order to be able to infer the final recording state of the disc even in the above loss situation, it is possible to easily restore the SRRI and disc recording state through this, This will be described in detail.

12, 13A, and 13B relate to a method of recording an optical disc of write once type according to the present invention, and particularly to a method of inferring the final recording state of a disc and using it for recording and reproducing even when the latest SRRI is lost. will be.

The loss of the latest SRRI will be the case that the SRRI is considered to be a defective area and the recorded information is unreliable. If the latest SRRI is lost, it means that the final recording state of the disc cannot be confirmed, and therefore the disc may not be used anymore in the worst case since the recordable location is not known.

That is, the present invention intends to provide a method for accurately restoring the final recording state of a disc even in the above case.

Fig. 12 is a flowchart of a method for recording a writeable optical disc of the present invention, and when the disc is loaded, it reads out the latest SRRI recorded in the management area and checks whether the corresponding SRRI is normal or lost information. (S10).

If the latest SRRI is not lost in this step (Non-Damaged), check the final disc recording state of the SRRI rotor as a normal step (S21), and perform recording only in the additional recordable area therefrom, and in the already recorded area. Playback is performed (S22).

If the latest SRRI is lost in this step (Damaged), first check the latest SRRI among the SRRIs that are normally played back without being lost (S31), and inferred the final disc recording state from this (S32), and inferred final In addition to recovering the lost SRRI from the disc recording state, recording is performed in the additionally recordable area, and the already recorded area is reproduced (S34).

In addition, the latest SRRI may be restored and recorded in the management area on the basis of the inferred final disc recording state (S33). However, the step S33 may be omitted, and the recording state of the newly changed disc may be recorded in the management area by the new SRRI after the recording and reproducing step S34.

13A and 13B illustrate a process of inferring and restoring a final disc recording state when the latest SRRI is lost. For convenience of description, the SRRI recording method described above with reference to FIGS. 7A to 11B is illustrated. Is shown as an example.

Fig. 13A shows the SRRI recorded last in the disc management area TDMA0. If the normal state is, SRRI # 5 will be the latest SRR information, but if there is a loss in SRRI # 5, the recording / reproducing apparatus (Fig. 14) Will read the latest SRRI out of the lossless SRRI, for example SRRI # 4.

That is, the actual final recording state of the disc (Fig. 11A, step 6) can be confirmed by SRRI # 5, but the information recognizable by the recording / playback apparatus (Fig. 14) 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 restore SRRI # 5 by comparing the information recorded in the SRRI # 4 with the actual final recording state in the disc, which will be described below.

First, the recording and reproducing apparatus (Fig. 14) 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 a position already recorded as a closed SRR does not need to be 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 case of SRR # 2 and SRR # 3 recognized as an open SRR from SRRI # 4, as shown in FIG. 11A (actual disc recording state), it is confirmed that dummy data is padded in all sectors of the cluster after the LRA position. From this, the recording and reproducing apparatus (Fig. 14) can infer that the corresponding SRR has been changed to the closed SRR.

In addition, SRR # 4 recognized as an open SRR confirms that only some sectors in the cluster including the LRA are padded after the LRA position from FIG. 11A (actual final disk recording state). You will be able to confirm that you can write from the cluster.

At this time, the recording / reproducing apparatus (Fig. 14) may change the already-recorded portion of the corresponding SRR # 4 to the closed SRR and set only the recordable area as a new open SRR, because the information necessary for the recording / reproducing apparatus (Fig. 14) is required. Since is an additional recordable position information (NWA), even if inferred as described above, the position of the NWA does not change and there is no problem.

Fig. 13B shows the result of restoring the latest 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. 14) records the latest restored SRRI # 5 in the management area again (in this case, it is the sixth SRRI and becomes SRRI # 6), and then records only in the additional recordable area, or Even if the restored SRRI # 5 is not recorded as SRRI # 6, recording is performed from the restored NWA information afterwards, and finally, the changed disk recording state is selectively recorded as SRRI # 6.

Fig. 14 relates to a recording / playback apparatus for an optical disk to which the present invention is applied, and the recording / playback apparatus is composed of a recording / playback section 10 for recording and playback on an optical disk and a control section 20 for controlling it. 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.

The optical disc recording and reproducing method according to the present invention is largely divided into two types. First, in the case of FIGS. 4 to 11B, the sectors in the cluster including the LRA position are forcibly padded after recording of the open SRR. There is a case of recording information identifying this, and optionally determining whether to pad the closed SRR, and recording the identification information according to the padding.

Secondly, as described above with reference to FIGS. 12 and 13B, the SRRR is padded in the SRR to effectively restore the lost SRRI. That is, the presence or absence of padding at the time of closing SRR is optional, but it can be seen that the present invention is more advantageous at restoring the data when padding to close the SRR.

First, the first recording and reproducing method of an optical disc according to the present invention will be described in detail. First, when an optical disc is loaded into a recording and reproducing apparatus, SRRI is read out as the latest disc management information recorded in a predetermined management area in the optical disc, for example, TDMA. In addition, the header and the SRR entry recorded in the SRRI are read out and temporarily stored in the memory 15 in the recording and playback section 10.

In the stored SRRI, the latest disc recording state is displayed. In particular, the open SRR can be identified through the header information, and the entire or unrecorded state of the disc and the open session through the SRR entry can be identified. It is possible to identify the presence and location of the SRR as well as to identify whether each of the SRR padding (padding), it is utilized in the recording and playback of the optical disc.

After the recording is performed in a specific open SRR, when the recording is completed, the dummy data is padded to an unrecorded sector in the cluster including the LRA, the padding identification information (padding_flag = 1b) is set for each sector, and the SRR entry in the SRRI. Is recorded as "P_flag = 1b" as the SRR status information at the time of update.

In addition, even when the SRR is closed by the close command of the control unit 20, whether or not the recordable part (for example, one cluster) is closed after padding or closed without padding. 16) can be selected, and depending on the designer, even if there is no padding command of the control unit 20, it may be designed to close after padding unconditionally. Such a function may be referred to as an "automatic padding function" by the recording / playback section 10, and the recording / playback section 10 displays dummy data by a padding command of the control section 20. FIG. It has a time advantage over the case of padding.

When the SRR state is changed by padding as described above, " padding_flag = 1b " is set for each padded sector, and also " P_flag = 1b " Allow the device to utilize this information.

Therefore, as the definition of the SRR type and the method of recording the SRRI according to the present invention are provided, it is possible for the designer who produces the recording / reproducing apparatus to design the recording / reproducing apparatus of various methods having the desired performance.

In addition, the second recording and reproducing method by SRRI restoration of the optical disk according to the present invention will be described in detail. First, when the optical disk is loaded into the recording and reproducing apparatus, the microcomputer 16 records in a predetermined management area in the optical disk, for example, TDMA. The pickup 11 is controlled to read out the latest SRRI, and after determining whether the SRRI is lost, if it is determined that the latest SRRI is lost, as described with reference to FIGS. 12, 13A, and 13B, By inferring and restoring the latest SRRI from the lossless SRRI, it is possible to restore the latest SRRI by checking the dummy data padded in the disk when the open SRR is changed to the closed SRR by the close command.

From the latest SRRI restored as described above or, if there is no loss of the latest SRRI, from the latest SRRI itself, the recording / playback section 10 checks the position of the additionally recordable open SRR, performs recording, and performs a constant recording. After receiving the close command of the control unit 20, the recording / playback unit 10 pads the dummy data to a part (or all areas) of the additional recordable areas remaining in the open SRR, and indicates that the changed data is changed to the closed SRR. The recording state of the changed disc is recorded as a new (latest) SRRI in the management area. When the optical disc is subsequently reloaded, the recording state of the final disc can be accurately checked even if the latest SRRI is lost.

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 management information recording method for a write once disc according to the present invention defines a new SRR type and a session type that accurately represent a recording state of the disc, and padding is performed on the open SRR, or by padding. In the closed case, padding identification information ("padding_flag") is set in the padded area, and another padding identification information ("P_flag") is also recorded in the SRR entry, resulting in a single recording having a new physical structure as a whole. It is possible to effectively record and manage the management information even in an optical disc, and it can be seen that when closing after padding, it is more effective for restoring SRRI.

Fig. 1 shows the entire structure of a writeable optical disc of the present invention and a method for recording disc management information.

2A to 2D show an open SRR type of a write-once optical disc to which the present invention is applied;

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

4A illustrates padding identification information when padding dummy data in an open SRR of an optical disc of write once type to which the present invention is applied;

4B illustrates padding identification information when padding dummy data in a closed SRR of an optical disc of write once type to which the present invention is applied;

Fig. 5 shows an entire structure of a writeable optical disc of the present invention and a method of recording an SRRI as disc management information.

Fig. 6A shows a list of SRR entries recorded in the SRRI of the present invention,

Fig. 6B shows one SRR entry recorded in the SRR entry list of the present invention,

Fig. 6C shows an open SRR entry number indicating the position of an open SRR recorded in the SRR entry list of the present invention,

7A to 11B show an example of a method of recording SRRI according to a disc recording state in a writeable optical disc of the present invention;

12 is a flowchart showing a recording method using SRRI of an optical disc of write once type according to the present invention;

13A and 13B are diagrams for explaining a method of restoring the latest SRRI in the write-once optical disc of the present invention;

Fig. 14 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 (16)

Creates an open SRR for recording in the disc, and when recording in the open SRR ends, pads unrecorded sectors included in the last cluster where recording is completed with dummy data, And recording the identification information identifying the padding in a specific area of the disc. The method of claim 1, And the padding identification information (padding_flag) is recorded in the cluster as information indicating whether padding exists for each sector. The method of claim 1, And the padding identification information (P_flag) is recorded in an SRR entry to indicate whether the corresponding SRR is padded. In closing the open SRR, if a recordable area remains in the SRR, the recordable area is changed to a closed SRR with or without padding. And a padding identification information according to whether or not the padding is present. The method of claim 4, wherein And the padding identification information (padding_flag) is recorded in the cluster as information indicating whether padding exists for each sector. The method of claim 4, wherein And the padding identification information (P_flag) is recorded in an SRR entry to indicate whether the corresponding SRR is padded. In recording the SRRI having a temporary disk management area (TDMA) and informing the recording state of the disk in the TDMA, Record one SRR entry corresponding to one SRR formed in the disk in the SRRI, Record information in SRRI indicating the position of the open SRR entry in the SRR entry, And recording padding identification information (P_flag) identifying whether there is a padding area in the SRR in the SRR entry. In recording the SRRI having a temporary disk management area (TDMA) and informing the recording state of the disk in the TDMA, Record one SRR entry corresponding to one SRR formed in the disk in the SRRI, Record information in SRRI indicating the position of the open SRR entry in the SRR entry, And recording session identification information (S_flag) indicating whether or not the corresponding SRR is the start of a session in the SRR entry. Allocate an open SRR for on-disk recording, When the recording in the open SRR is terminated, unrecorded sectors included in the last cluster which has been recorded are padded with dummy data, and identification information identifying whether the padding is provided is set for each sector in the cluster. In closing the open SRR, if there is a recordable cluster remaining in the SRR, the recordable cluster is changed to a closed SRR with or without padding, and each sector in the padded cluster is identified as a padded sector. A recording method of an optical disc of write once type, characterized in that information is recorded. The method of claim 9, And if padding exists in the open SRR or the closed SRR, the padding identification information is further recorded in the SRR entry. 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 11,       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 11, 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 11, 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 11, And the recording state information is SRRI. After allocating the open SRR for recording in the disk, and delivers a recording command, when the recording is no longer in the area, the control unit for transmitting a command to close the area (closing), When recording is performed in the open SRR according to a recording command of the controller, when recording is completed, padding unrecorded sectors included in the last cluster whose recording is completed with dummy data, and identification information identifying whether the padding is performed is performed for each sector in the cluster. If a recordable cluster remains in the SRR according to the close command of the control unit, the recordable cluster is changed to a closed SRR with or without padding, and each sector in the padded cluster is changed. And a recording and reproducing unit for recording identification information indicating that the sector is a padded sector.