Patent Document

This application is a Continuation of U.S. application Ser. No. 11/984,172, filed Nov. 14, 2007 now U.S. Pat. No. 7,672,208 which is a Continuation of U.S. application Ser. No. 10/911,727, filed on Aug. 5, 2004, now U.S. Pat. No. 7,313,065, which claims, under 35 U.S.C. §119, the priority benefit of Patent Application No. 2003-054165 filed in Republic of Korea on Aug. 5, 2003; Patent Application No. 2003-073088 filed in Republic of Korea on Oct. 20, 2003; Patent Application No. 2004-032677 filed in Republic of Korea on May 10, 2004, and U.S. Provisional Application No. 60/546,961 filed on Feb. 24, 2004. The entire contents of each of these applications are hereby incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a write-once optical disc and an apparatus and method for recording/playing-back management information on/from the optical disc such as a Write-Once Blu-ray Disc (BD-WO). 
     2. Discussion of the Related Art 
     As an optical recording medium, optical discs on which high-capacity data can be recorded are widely being used. Among them, a new high-density optical recording medium (HD-DVD), for example, a Blu-ray disc, has been recently developed for recording and storing high-definition video data and high-quality audio data for a long-term period. 
     The Blu-ray disc involves the next generation HD-DVD technology and is the next generation optical recording solution, which has an excellent capability to store data more than existing DVDs. Recently, a technical specification of an international standard for HD-DVD has been established. Various standards for Blu-ray discs are being prepared. Particularly the standards for a write-once Blu-ray disc (BD-WO) are being proposed. 
       FIG. 1  schematically illustrates the structure of a recording area of a rewritable Blu-ray disc (BD-RE) according to a related art. As shown in  FIG. 1 , the disc is divided into a lead-in zone, a data zone and a lead-out zone allocated in the inner-to-outer radius direction. The data zone is provided with an inner spare area (ISA) and an outer spare area (OSA) respectively disposed at the inner and outer radiuses to replace defective areas, and a user data area provided between the spare areas to record user data therein. 
     If a defective area is generated in the user data area while data is recorded on the rewritable Blu-ray disc (BD-RE), data is transferred from the defective area to the spare area and is recorded in a portion of the spare area. This portion of the spare area is known as a replacement area for replacing the defective area. Additionally, position information related to the defective area, that is, position information on the defective area and on the corresponding replacement area is recorded in defect management areas (DMA1, DMA2, DMA3, and DMA4), which are provided in the lead-in/out zones, to perform defect management. The BD-RE has a cluster as a minimal recording-unit. One cluster has a total of 32 sectors, and one sector has 2048 bytes. 
     Since rewriting can be performed in any area of the BD-RE, the entire area of the disc can be randomly used irrespective of a specific recording manner. Also, since the defect management information can be written, erased and rewritten in the defect management areas (DMAs), it does not matter that the size of the defect management area is small in particular, the BD-RE allocates and uses 32 clusters for each of the defect management areas (DMAs). 
     On the other hand, in a write-once disc such as a BD-WO, writing can be only made once in a specific area of the disc and thus, the manner of recording is much limited. As such, defect management becomes one of the important matters when data is to be recorded on a high-density write-once disc such as a BD-WO. Accordingly, the write-once disc requires a management area to record therein information on defect management and on disc management. In this regard, the write-once optical disc requires a larger management area for recording information on the defect management and on the disc use state due to its unique ‘write-once’ characteristic. 
     However, a unified standard satisfying the above requirements is not available for a write-once disc such as a BD-WO. Further, any standard related to presently declared write-once optical discs cannot solve the above drawbacks. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention is directed to a write-once optical disc, and an apparatus and method for recording/playing back management information on/from the optical disc that substantially obviate one or more problems due to limitations and disadvantages of the related art. 
     An object of the present invention is to provide a method and apparatus for separately recording and managing management information on a write-once disc, thereby enhancing the use efficiency of a plurality of temporary disc/defect management areas (TDMAs) provided on the disc. 
     Another object of the present invention is to provide a method and apparatus for efficiently recording and playing back an optical disc using management information. 
     Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. 
     To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a recording medium comprising: at least one recording layer; a plurality of temporary defect management areas (TDMAs) on the at least one recording layer; and a plurality of defect management areas DMAs) on the at least one recording layer, wherein at least one of the TDMAs includes first and second indicators, the first indicator indicating which TDMA is an in-use TDMA, and the second indicator indicating whether or not the recording medium is closed. 
     In another aspect of the present invention, there is provided a recording medium comprising: at least one recording layer; a plurality of temporary management areas on the at least one recording layer; and a plurality of defect management areas (DMAs) on the at least one recording layer, wherein at least one of the temporary management areas includes a DMA access indicator indicating whether or not the recording medium is closed. 
     In a further another aspect of the present invention, there is provided a method of recording management information on a recording medium, the recording medium including a plurality of temporary defect management areas (TDMAs) on at least one recording layer, and a plurality of defect management areas (DMAs) on the at least one recording layer, the method comprising: recording first and second indicators in at least one of the TDMAs, the first indicator indicating which TDMA is an in-use TDMA, and the second indicator indicating whether or not the recording medium is closed. 
     In a further another aspect of the present invention, there is provided a method of recording management information on a recording medium, the recording medium including a plurality of temporary management areas on at least one recording layer, and a plurality of defect management areas (DMAs) on the at least one recording layer, the method comprising: recording, in at least one of the temporary management areas, a DMA access indicator indicating whether or not the recording medium is closed. 
     In a further another aspect of the present invention, there is provided a method of quickly accessing a recording medium, the method comprising: reading TDMA (temporary disc management area) access indicator (TAI) information from a loaded recording medium; determining whether or not the recording medium is closed based on the TAI information; and accessing management information from an in-use-TDMA based on the TAI information, if the determining step determines that the recording medium is not closed. 
     In a further another aspect of the present invention, there is provided an apparatus for providing management information on a recording medium, the recording medium including a plurality of temporary defect management areas (TDMAs) on at least one recording layer, and a plurality of defect management areas (DMAs) on the at least one recording layer, the apparatus comprising: a recording part to record first and second indicators in at least one of the TDMAs, the first indicator indicating which TDMA is an in-use TDMA, and the second indicator indicating whether or not the recording medium is closed. 
     In a further another aspect of the present invention, there is provided an apparatus for providing management information on a recording medium, the recording medium including a plurality of temporary management areas on at least one recording layer, and a plurality of defect management areas (DMAs) on the at least one recording layer, the apparatus comprising: a recording part to record, in at least one of the temporary management areas, a DMA access indicator indicating whether or not the recording medium is closed. 
     In a further another aspect of the present invention, there is provided an apparatus for quickly accessing a recording medium, the apparatus comprising: a pickup unit; and a controller controlling the pickup unit to read TDMA (temporary disc management area) access indicator (TAI) information from a loaded recording medium, determining whether or not the recording medium is closed based on the TAI information, and accessing management information from an in-use-TDMA based on the TAI information if the recording medium is determined to be not closed. 
     It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings: 
         FIG. 1  is a schematic view illustrating the structure of a rewritable Blu-ray disc according to a related art; 
         FIGS. 2A and 2B  are views respectively illustrating the structure of a single-layer write-once optical disc and the structure of a dual-layer write-once optical disc according to an embodiment of the present invention; 
         FIGS. 3A-3E  are views illustrating the structure of a TAI and a method for recording and using the TAI for a single-layer write-once optical disc and a dual-layer write-once optical disc according to an embodiment of the present invention; 
         FIGS. 4A-4C  are views illustrating the structure of a TAI and a method for recording and using the TAI for a single-layer write-once optical disc and a dual-layer write-once optical disc according to another embodiment of the present invention; 
         FIG. 5A  is a view illustrating a variety of disc defect management and disc use state information recorded in a TDMA according to an embodiment of the present invention; 
         FIG. 5B  is a view illustrating a structure of a TDDS according to all embodiment of the present invention; 
         FIGS. 6A and 6B  are views illustrating two examples of the contents of a TAI according to an embodiment of the present invention; 
         FIG. 7  is a block diagram illustrating an optical recording/reproducing apparatus according to an embodiment of the present invention; and 
         FIG. 8  is a flow chart illustrating an optical recording/playback method using an optical recording/reproducing apparatus according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. 
     For description convenience, a write-once optical disc is exemplified as a write-once Blu-ray disc (BD-WO). 
       FIGS. 2A and 2B  are views illustrating the structure of a write-once optical disc such as a BD-WO and a method for recording management information on the disc according to an embodiment of the present invention. Particularly,  FIG. 2A  illustrates a single-layer write-once optical disc having one recording layer according to an embodiment of the present invention.  FIG. 2B  illustrates a dual-layer write-once optical disc having two recording layers according to an embodiment of the present invention. 
     As shown in  FIG. 2A , the single-layer optical disc includes a lead-in area  30 , a data area  32  and a lead-out area  34  in the inner-to-outer radius direction. The data area  32  includes an inner spare area (ISA) and an outer spare area (OSA) for replacing defective areas, and a user data area for recording user data therein. The write-once optical disc also includes a plurality of temporary disc/defect management areas TDMAs in addition to a plurality of disc/defect management areas (DMAs). The DMAs (DMA1-DMA4) are provided in the lead-in and lead-out areas  30  and  34 . The TDMAs store temporarily management information whereas the DMAs store more permanently the management information. For instance, when the disc is to be finalized or closed, the management information stored in a TDMA is transferred to and stored in each of the DMAs. The same information is repeatedly stored four times using the plurality of DMAs. 
     Here, two TDMAs are provided on the disc, and are referred to as a TDMA0 and a TDMA1. The TDMA0 having a fixed size (for example, 2048 clusters) is located in the lead-in area  30 , and the TDMA1 having a variable size is provided in the spare area OSA having a variable size. The TDMA0 should be necessarily provided on the disc, whereas the TDMA1 is selectively allocated with various sizes, appropriately. For instance, the size of the TDMA1 can be ¼ of the size (N*256 clusters) of the OSA such that P=(N*256/4) clusters where P=size of the TDMA1 and N is a positive integer. 
     Further, the plurality of TDMAs are used in a specific use sequence. For instance, it is used in a sequence of the TDMA0 and then the TDMA1. Identification numbers (TDMA0 and TDMA1) are given to the TDMAs in a serial sequence depending on the use sequence. 
     According to an embodiment of the present invention, management information for managing the plurality of TDMAs is recorded at the head of the TDMA0. This TDMA management information is referred to herein as a TDMA access indicator (TAI), e.g., element  50  in  FIG. 2A . The TAI can also be referred to as a TLI (TDMA location indicator). The TAI identifies which TDMA among all the TDMAs to be used in a specific use sequence/order, is an “in-use TDMA”. An “in-use TDMA” is a TDMA that is currently being used/accessed or that is currently available for use, among all the TDMAs having the designated use sequence. The TAI also provides information on whether or not the disc is currently closed/finalized. 
     The TAI allows an initial disc access time to be reduced greatly since the TAI identifies the in-use TDMA and thus, information on the last defect management and on the disc use state can be quickly obtained from the identified in-use TDMA. This is beneficial especially when the disc is initially loaded. Without the TAI, all the TDMAs have to be scanned to determine which TDMA is the in-use TDMA in order to obtain the necessary management information from that in-use TDMA. 
     In the single-layer write-once disc of  FIG. 2A , the TAI  50  is provided by first two head clusters  50   a  and  50   b  among the fixed 2048 clusters of the TDMA0. 
     On the other hand, as shown in  FIG. 2B , the dual-layer writer-once optical disc includes a first recording layer (Layer  0 ) and a second recording layer (Layer  1 ). The first recording layer (Layer  0 ) includes a lead-in area  40  and an outer zone  0  respectively at the inner and outer radius areas of the disc. The second recording layer (Layer  1 ) includes a lead-out area  41  and an outer zone  1  respectively at the inner and outer radius areas of the disc. The lead-in and lead-out areas  40  and  41  are known as inner zones. 
     Further, the disc includes a data area  42  on each of the recoding layers. The data area of the first recording layer (Layer  0 ) includes inner and outer spare areas ISAO and OSAO, and a user data area  43  therebetween. The user area of the second recording layer (Layer  1 ) includes inner and outer spare areas ISA1 and OSA1 and a user data area  44  therebetween. The ISA0 has a fixed size such as 2048 clusters. The ISA1, OSA0 and OSA1 have variable sizes. For instance the size of the ISA1 may be (L*256) clusters and the size of each of the OSA0 and OSA1 may be (N*256) clusters where L and N are positive integers. The disc also includes a plurality of DMAs (DMA1-DMA4) in the lead-in area  40 , the outer zones  0 ,  1  and the lead-out area  41 . The same information is repeatedly recorded in the DMAs for the redundancy purpose. 
     Furthermore, the disc includes a plurality of TDMAs (TDMA0, TDMA1, TDMA2, TDMA3 and TDMA4) in addition to the DMAs. The TDMA0 and the TDMA1 exist in the lead-in and lead-out areas  40  and  41  (inner zones) and have fixed sizes (e.g., 2048 clusters). The TDMA2, the TDMA3 and the TDMA4 are provided with variable sizes that vary according to the variable sizes of the corresponding spare areas. For instance, the size of each of the TDMA2, TDMA3 and TDMA4 can be ¼ of the size of the corresponding spare area. In one example, the TDMA2 and the TDMA3 each have the size of P=N*256/4 clusters, and the TDMA4 has the size of Q=L*25614 clusters. 
     Moreover, all the TDMAs are used in a specific use sequence. For instance, the TDMA0-TDMA4 are used in the sequence of the TDMA0 to TDMA4. This means, whenever recording is desired to a TDMA, the TDMA0 is first used to record therein. When the TDMA0 is full, i.e., fully used up, then the TDMA1 is next used to record therein. When the TDMA1 is full, then the TDMA2 is next used to record therein, and so on. Identification numbers (TDMA0 to TDMA4) are given to the TDMAs in a serial sequence depending on the use sequence. 
     As in the single-layer write-once disc of  FIG. 2A , the dual-layer optical disc of  FIG. 2B  also includes a TAI  57  at the head area of the TDMA0 preferably located in the lead-in area  40  of the disc. Generally since more TDMAs are provided on the dual-layer optical disc compared to the single-layer disc, providing the TAI on the dual-layer optical disc is of great importance. 
     In the dual-layer optical disc, the TAI is represented by first five head clusters  57   a - 57   e  among the fixed 2048 clusters of the TDMA0. 
       FIGS. 3A to 3B  are views illustrating the structure of a TAI according to an embodiment of the present invention.  FIG. 3A  illustrates the structure and use of a TAI in a single-layer write-once optical disc such as a single-layer BD-WO, and  FIG. 3B  illustrates the structure and use of a TAI in a dual-layer write-once optical disc such as a dual-layer BD-WO. The structures of the TAI as shown in  FIGS. 3A and 3B  are applicable to the discs shown in  FIGS. 2A and 23 . 
     As shown in  FIG. 3A , in the single-layer write-once optical disc, the TAI  50  is composed of the first two head clusters  50   a  and  50   b  of the TDMA0 on the disc. One of the two TAI clusters  50   a  and  50   b  is used as a DMA disc closing indicator  51  for informing whether or not the optical disc is finalized/closed, and the other one of the two TAI clusters  50   a  and  50   b  cluster is used as a TDMA1 in-use indicator  52  for indicating whether or not the TDMA1 is the in-use TDMA. In this example, the first head cluster  50   a  of the TAI  50  functions as the DMA disc closing indicator  51 , and the second head cluster  50   b  functions as the TDMA1 in-use indicator. However, this allocated order can be switched as needed. 
     The TDMA1 in-use indicator  52  indicates directly whether or not the corresponding TDMA1 is the in-use TDMA. This indication is implemented by providing certain recording in the second cluster  50   b  of the TAI  50 . If the TAI cluster  50   b  has this certain recording therein, then the TAI cluster  50   b  is said to be in the ‘recorded state’. If the TAI cluster  50   b  does not have this certain recording therein, then the TAI cluster  50   b  is said to be not in the recorded state. If the TAI cluster  50   b  (the TDMA1 in-use indicator  52 ) is not in the recorded state, it means that the firstly used TDMA0 is the in-use-TDMA. If the TAI cluster  50   b  is in the recorded state, it means that the next TDMA1 is the in-use-TDMA, which means the firstly used TDMA0 is full, i.e., fully used up, so that there is no recording space in the TDMA0. 
     Accordingly, by examining the recorded/unrecorded state of the TAI cluster  50   b , a recording/reproducing apparatus can identify quickly which TDMA can and should be currently used during a data recording operation of the disc. This reduces the disc access time greatly and provides an efficient and effective way to carry data recording operations of the disc. 
     The DMA disc closing indicator  51  functions to inform whether or not the write-once optical disc is closed/finalized. This can be realized by recording certain data in the first cluster  50   a  of the TAI. If there is such recording in the first TAI cluster  50   a , then the first TAI cluster  50   a  is said to be in the recorded state and the recorded state of the first TAI cluster  50   a  means the disc is finalized/closed. If there is no such recording in the first TAI cluster  50   a , then the first TAI cluster  50   a  is said to be not in the recorded state, which in turn means the disc is not yet finalized/closed. 
     A user or host can request the disc to be closed, or the closing of the disc can be triggered automatically if there is no user data area or management data area to record user data/management data therein. Once the disc is closed, the disc is essentially in a read-only state, thereby making it impossible to record user data subsequently. The closing of the disc is also referred to as finalizing the disc or disc finalization. 
     If the disc is to be closed as described above, the optical recording/playback apparatus transfers and records the latest management information from the latest TDMA into each of the DMAs. At this time, the first TAI cluster  50   a  (DMA disc closing indicator cluster  51 ) is recorded with data (e.g., dummy data or some other data) to be placed in the recorded state. The recorded state of the first TAI cluster  50   a  indicates that the disc is closed. 
     As shown in  FIG. 3C , if none of the TAI clusters  50   a  and  50   b  are in the recorded state, it means that the in-use-TDMA is the TDMA0 as the first TDMA and the disc is not closed. 
     Placing the TAI clusters  50   a  and  50   b  in the recorded state is done by recording the TAI clusters  50   a  and  50   b  with some data. This can be realized by recording the TAI clusters  50   a  and  50   b  with high frequency signals, dummy data, or real data (meaningful data). For instance, the latest temporary disc definition structure (TDDS) information of the corresponding TDMA can be recorded into the corresponding TAI cluster as an example of using real data to place the TAI cluster in the recorded state. Examples of recording such real data in the TAI clusters will be described later reference to  FIGS. 6A and 6B . 
     Accordingly, the TAI includes the disc closing information as well as information on the in-use-TDMA among the TDMAs. 
     According to an embodiment of the present invention, the dual-layer disc can have up to five TDMAs (TDMA0-TDMA4). Then the TAI for such a disc is composed of the first five head clusters of the TDMA0, where the first head cluster of the TDMA0 functions as the DMA disc closing indicator and the next four head clusters (second to fifth clusters) of the TDMA0 function as the TDMA in-use indicators. The second to fifth clusters of the TDMA0 correspond respectively to the TDMA1-TDMA4 such that they function as the TDMA1-TDMA4 in-use indicators, respectively. Each of these TDMA in-use indicators, as discussed in connection with  FIG. 3A , indicates whether or not the corresponding TDMA is the in-use TDMA. 
       FIG. 3B  illustrates an example of the structure of a TAI  57  for the dual-layer write-once disc of  FIG. 2B  according to an embodiment of the present invention. As shown in  FIG. 3B , the TAI  57  is composed of first to fifth head clusters  57   a - 57   e  of the TDMA0. The first TAI cluster  57   a  functions as a DMA disc closing indicator  51 . The second to fifth TAI clusters  57   b - 57   e  function respectively as TDMA4-TDMA1 in-use indicators  55 - 52 . As such, the second to fifth TAI clusters  57   b - 57   e  are used in the order of decreasing address, which is indicated by the ‘recording direction’ arrow. That is, recording in the TAI clusters  57   b - 57   e  occurs sequentially from the cluster  57   e  to the cluster  57   b . However, these clusters can be used in the reverse direction. 
     If none of the second to fifth TAI clusters  57   b - 57   e  are in the recorded state, it means that the firstly used TDMA0 is the in-use-TDMA. If the fifth TAI cluster  57   e  (TDMA1 in-use indicator  52 ) alone is in the recorded state, it means that the TDMA0 is full and the TDMA1 is the in-use-TDMA. If only the fifth and fourth TAI clusters  57   e  and  57   d  are in the recorded state, it means that the TDMA0 and TDMA1 are full and the TDMA2 is the in-use-TDMA. This is illustrated in  FIG. 3D . The rest of the in-use indicator clusters are used in the similar manner. 
     If all the clusters  57   a - 57   e  of the TAI  57  are in the recorded state as shown in  FIG. 3E , it means that the current disc is closed, and no data can now be recorded on any area of the disc. Thus, only a reproduction of the disc may be allowed. 
       FIGS. 4A to 4C  are views illustrating the structure of a TAI according to another embodiment of the present invention.  FIG. 4A  illustrates the structure and use of a TAI in a single-layer write-once optical disc such as a single-layer BD-WO, and  FIGS. 4B and 4C  illustrate the structure and use of a TAI in a dual-layer write-once optical disc such as a dual-layer BD-WO. The structures of the TAI as shown in  FIGS. 4A-4C  are applicable to the discs and TAI ( 57 ) shown in  FIGS. 2A and 2B . 
     In this embodiment, the TAI indicates which TDMA is the in-use TDMA by indicating which TDMA(s) are full. In the example of  FIGS. 4A-4C , assume that the TDMAs are used sequentially from the TDMA0 to the TDMA1 (single-layer disc), or to the TDMA4 (dual-layer disc) as discussed above. Also the TAI is used in a sequence starting from the TAI cluster having a low PSN to the TAI cluster having a high PSN. 
     As shown in  FIG. 4A , in the example of the single-layer disc, two clusters  172   a  and  172   b  are allocated for a TAI  172 . The first and second TAI clusters  172   a  and  172   b  function respectively as a TDMA0 full indicator  173  and a TDMA1 full indicator  174 . Accordingly, if only the TDMA0 is full, the first TAI cluster  172   a  (TDMA0 full indicator  173 ) alone is indicated as being in the recorded state. This means that the TDMA1 is the in-use TDMA and can be used. If the first TAI cluster  172   a  is not in the recorded state, it means that the TDMA0 is not yet full and is available for use. That is, the TDMA0 is the in-use TDMA and can be used. If both the first and second TAI clusters  172   a  and  172   a  are in the recorded state, then the TDMA0 and TDMA1 are all full, which means there is no TDMA available for recording management information and the disc is closed/finalized. 
     As shown in  FIG. 4B , in the dual-layers write-once disc, first through fifth clusters  175   a - 175   e  are allocated for a TAI  175  and are recorded sequentially in that order in this example. The first to fifth cluster  175   a - 175   e  correspond to the TDMA0 to TDMA4, respectively, and function as TDMA0-TDMA4 full indicators  176 - 180 , respectively. Each TAI cluster indicates whether or not the corresponding TDMA if full. 
     Accordingly, for instance, if no TAI cluster is in the recorded state, it means that the TDMA0 is the in-use TDMA. If only the first TAI cluster  175   a  is in the recorded state, it means that the TDMA0 is full and the in-use-TDMA is the TDMA1. If only the first and second TAI clusters  175   a  and  175   b  are in the recorded state, it means that the TDMA0 and TDMA1 are fully used and the TDMA2 is currently available for use. If all five TAI clusters  175   a - 175   e  are in the recorded state as shown in  FIG. 4C , it means that the TDMA0 to the TDMA4 are all fully used up and there is no usable TDMA. In this case, since the corresponding disc has no area for recording the TDMS information therein, the disc is finalized/closed. 
     In the embodiment of  FIGS. 4A-4C , the TDMA full indicators of the TAI can be used to determine whether or not the disc is finalized/closed and thus can function also as the disc closing indicator. For instance, if the TAI cluster  174  (TDMA1 full indicator) in the example of  FIG. 4A  is in the recorded state, it means that the disc is closed/finalized. In the example of  FIG. 4C , if the TAI cluster  180  (TDMA4 full indicator) is in the recorded state, it means that the disc is closed/finalized. 
     According to the embodiments of the present invention, the TAI clusters shown in  FIGS. 3A-4C  can be used sequentially in the order of decreasing address or increasing address. However, it may be desirable that the recording of the TAI clusters is performed in a sequence starting from the cluster having a high PSN (Physical Sector Number) to the cluster having a lower PSN, as shown in  FIG. 3B . This prevents interference with an OPC (Optimum Power Calibration, not shown) disposed in the inner radius direction adjacently to the TDMA0. 
     According to the present invention, since the recording/reproducing apparatus checks for a recorded state within the TAI to determine the location of the in-use-TDMA if the disc is loaded, the recording/reproducing apparatus can quickly move to a start location of the in-use-TDMA to read the lastly recorded TDMS (temporary disc management structure) information there from, thereby initially obtaining a variety of initialization information for playback. However, if there is no TAI, the recording/reproducing apparatus has to scan all TDMAs beginning from the TDMA0 to search for an available TDMA. This is a drawback because a long disc access time is needed for initial playback. Thus the present invention solves the above drawback effectively by providing and using the TAI. Moreover, the DMA disc closing indicator of the TAI quickly indicates whether or not any recording can be made to the disc. 
     According to an embodiment of the present invention, if the single-layer write-once disc has more than two TDMAs or if the dual-layer write-once disc has a certain number of TDMAs, then the total number of TAI clusters present in the TAI as the TDMA in-use indicators changes according to the total number of TDMAs present on the disc. For instance, if there is an X number of TDMAs on the disc, then there is an (X−1) number of TAI clusters that function as the TDMA in-use indicators. Each of such TAI clusters would correspond to one of the TDMAs, generally excluding the first TDMA (TDMA0), in the order of the TDMA use sequence. 
     The TAI  50 ,  57 ,  172 ,  175  is located at the head of the TDMA0 located in the lead-in area of the single layer or dual-layer disc as shown in  FIGS. 2A and 2B . However, any location of the TAI on the disc is acceptable if it is located within an area which a recording/reproducing apparatus can initially recognize as the management area. In this regard, the data area of the disc may be excluded. For instance, the TAI can alternatively be provided at the end portion of the TDMA0. As another alternative, the TAI can be provided within one, some or each of the DMAs of the single-layer/dual-layer write-once disc. 
       FIG. 5A  illustrates a variety of information on the disc defect management and on the disc use state, where this information is recorded in the TDMAs. Whenever recording is performed on the disc, the recording is generally performed by more than one cluster, a cluster being generally a minimal recording-unit. Various disc management information recorded in the TDMA (e.g., TDMA0, TDMA1, TDMA2, TDMA3, or TDMA4) is collectively referred to herein as TDMS (temporary disc management structure) information. The TDMS information can be changed or added depending on a standard. 
     As shown in  FIG. 5A , the TDMS information includes, but is not limited to, a Temporary Defect List (TDFL) for recording disc defect management information, a Sequential Recording Range Information (SRRI) applied in a sequential recording mode as information for representing the disc use state, a Space-Bit Map (SBM) applied in a random recording mode, and a Temporary Disc Definition Structure (TDDS) information including recent location information of the TDFL and the SRRI (or SBM). The SRRI and the SUM may not be concurrently used, and either the SRRI or SBM is recorded on the disc depending on the recording mode. 
     As an example, in the context of the disc structure shown in  FIGS. 2A and 2B , each of the TDMA0˜TDMA4 includes one or more TDFLs/SBMs/SRRIs each recorded with a TDDS in one cluster at each recording/updating time, as shown in  FIG. 5A . That is, each recording of a TDFL/SBM/SRRI with a TDDS is allotted one cluster. Generally, the last sector of each such cluster is designated to store therein the TDDS information as shown in  FIG. 5A . However, the first sector, instead of the last sector, of each such cluster can also be used to store the TDDS information. 
     The TDDS information includes general disc record/playback information, and is generally always checked at the time of loading the disc in the record/playback apparatus since it includes pointer information for indicating the recent locations of the TDFL and the SRRI (or SBM) as described above. According to the disc use state, the TDDS information is continuously updated and the updated TDDS information is written in the TDMA at each update/recording time. Thus, the last TDDS in the latest TDMA used should be checked to access a variety of management information on a current disc use state. 
       FIG. 5B  is a view illustrating the structure of a TDDS according to an embodiment of the present invention. This structure can be applied to any disc structure having a TDDS therein. Referring to  FIG. 5B , a variety of information recorded in the TDDS includes, but is not limited to: a TDDS identifier” field  61  and a “TDDS format” field  62  for distinguishing a property of the TDDS; a “TDDS Update Count” field  63  for indicating update times of the TDDS; a “first PSN of Drive Area” field  64  for recording a variety of drive information; a “first PSN of Defect List” field  65  for indicating a first physical sector number of the defect list in case where the disc is closed; a “Location of LSN 0 of User Data Area” field  66  (LSN=last sector number) and a “last LSN of User Data Area” field  67  for indicating a start and an end of the user data area; an “Inner Spare Area 0 size” field  68 , an “Outer Spare Area size” field  69  and an “Inner Spare Area 1 size” field  70  for indicating the size of the corresponding spare area; a “Spare Area Full flags” field  71  for selectively indicating whether or not the spare areas are fully used (full); a “Recording Mode” field  72  for indicating a disc recording mode such as a sequential recording mode or a random recording mode; a “general flag bits” field  73  for indicating whether or not the write-protection of the disc exists; an “Inconsistency flags” field  74  for indicating an update state of the TDMS information; a “Last Recorded Address of User Data Area” field  75  for indicating a location of the last recorded user data within the user data area; a “Size of TDMAs in Outer Spare Area” field  76  and a “Size of TDMS in Inner Spare Area 1” field  77  for indicating the size of the corresponding TDMA allocated within the spare area; a “First PSN of 1 st  Cluster of Defect List” field  78  for indicating a first physical sector number of the latest defect list in the latest TDMA area to a “first PSN of 8 th  Cluster of Defect List” field  79  for indicating the 8 th  physical sector number (Defect list generally does not exceed four clusters in the single-layer optical disc and eight clusters in the dual-layer optical disc); a “first PSN of SRRI/SBM for L0” field  80  and a “first PSN of SBM for L1” field  81  for indicating the location of the SRRI (or SBM), which is finally recorded in a sequential or random recording mode; a “next available PSN of ISA0” field  82 , a “next available PSN of OSA0” field  83 , a “next available PSN of ISA1” field  84 , a “next available PSN of OSA1” field  85  for indicating a next available physical sector number in the corresponding spare area; and a “Year/Month/Data of recording” field  86  for indicating a recording time, and a “Drive ID” field  87  for indicating a manufacture company, an additional identification, a serial number and the like. 
     Some of these fields of the TDDS can be non-variable fields (not updated). Such fields may include the “TDDS identifier” field  61 , the “Inner Spare Area 0, 1 size” fields  68 - 70 , the “Outer Spare Area size” field  69 , the “Recording Mode” field  72 , the “Size of TDMAs in Outer Spare Area” field  76 , the “Size of TDMAs in Inner Spare Area 1” field  77  among the TDDS information discussed above. For description convenience, information included in these non-variable fields is called “fixed management field” information. Since the fixed management field information is the same no matter which TDDS is played-back, the entire structure of the disc, the recording manner and the like can be determined through this information. 
     Further, some of the fields of the TDDS may need to be continuously updated according to a need. Such fields may include the “first PSN of 1 st  Cluster of Defect List” . . . “first PSN Of 8 th  Cluster of Defect List” field  78  . . .  79 , the “next available PSN of ISA0” field  82 , the “next available PSN of OSA0” field  83 , the “next available PSN of ISA1” field  84 , and the “next available PSN of OSA1” field  85 . For description convenience, information included in these variable fields is called “variable management field” information.** 
     Accordingly, if the TDDS information is recorded in the TAI and is played-back according to an embodiment of the present invention, the entire disc structure, the recording manner/mode and the like can be firstly determined through the fixed management field information. For instance, a corresponding TDMA is easily accessed through the size information of the TDMA area included in the fixed management field information. 
       FIGS. 6A and 6B  illustrate two examples of different contents of the TAI cluster according to an embodiment of the present invention. Although  FIGS. 6A and 6B  show one TAI cluster, each cluster of the TAI discussed herein can have the same or similar content structure. 
     Particularly,  FIGS. 6A and 6B  are examples of recording certain real data into the TAI clusters to selectively place the TAI clusters into the recorded state. Some or all of such real data recorded in the TAI can be directly used to indicate whether or not the TAI cluster(s) is in the recorded state so as to identify the in-use TDMA as discussed above. The use of such real data has an advantage in that additional relevant information can be provided by the TAI in addition to the indication of the current in-use TDMA. It should be noted, however, that dummy data or any other designated signals can be recorded into the TAI clusters to indicate the recorded/unrecorded state of the TAI clusters. The TAI content structures of  FIGS. 6A and 6B  are applicable to the TAI and disc structures shown in  FIGS. 2A-5B  and the methods of  FIG. 8 . 
     According to one example as shown in  FIG. 6A , the TAI cluster, which corresponds to a particular TDMA (or latest TDMA in case that the TAI cluster indicates the disc closing) as discussed above, includes the latest TDDS information associated with the TDMA corresponding to the TAI cluster, in addition to the information indicating whether the corresponding TDMA is the in-use TDMA. In case where the last TDDS is recorded in the last cluster of each TDMA, the TDMA including the latest TDDS and the in-use-TDMA can be different from each other, which in turn can cause errors when accessing the disc. By providing the additional information in the TAI as in  FIG. 6A , such an error can be prevented. 
     A detailed description of this situation is as follows by referring to  FIG. 6A . First, assume that the TAI is recorded in cluster units, a cluster being the minimal recording-unit. In the first sector (Sector  0 ) of the TAI cluster having 32 sectors, there exist an identification field  92  (“TAI identifier”) for allowing the recognition of the TAI information, a TAI format information field  93  (“TAI format”) related with a version of the current disc, and a TAI update count field  94  (“TAI update count”) for increasing a count value by 1 whenever the TAI is updated. The update count field  94  can also be used even as the information for indicating how many clusters may be present within the TAI. Further, there exists a TDDS location field  95  (“Latest TDDS location”) for providing information on the TDMA in which the latest TDDS information is located. 
     The remaining area  96  of the first sector (Sector  0 ) of the TAI cluster is used to indicate the recorded or unrecorded state of the TAI cluster by using a predetermined value (for example, setting the field to “00h”). For instance, if the remaining area  96  of Sector  0  of the TAI cluster has certain designated recording as discussed above, then the TAI cluster is said to be in the recorded state to indicate the in-use status of the corresponding TDMA or the disc closing as discussed above in connection with  FIGS. 3A-4C . 
     The TDDS location field  95  in the first sector (Sector  0 ) of the TAI cluster identifies a TDMA in which the latest TDDS information is recorded irrespective of whether or not that TDMA is fully used up. For example, the values of this field  95  can be defined so that “0000 0000b” means the latest TDDS exists in the TDMA0, “0000 0001b” means the latest TDDS exists in the TDMA2, “0000 0011b” means the latest TDDS exists in the TDMA3, and “00000 0000 b ” means the latest TDDS exists in the TDMA4. Other examples are possible. Accordingly, in the example of  FIG. 3C , if the second cluster  50   b  of the TAI  50  alone is in the recorded state (e.g., the area  96  of the TAI cluster  50   b  in  FIG. 3C  is in the recorded state) and the TDDS location field  95  (i.e., of the second TAI cluster  50   b  in  FIG. 3C ) has a value of “0000 0000b”, it means the usable TDMA is the TDMA1, but the last updated TDDS (latest TDDS information) is located within the TDMA0 on the disc. 
     In addition, the latest TDDS information is recorded into a TDDS information field  97  (“Latest TDDS”) of the second sector (Sector  1  of the TAI cluster). As a result, the TAI can be utilized even for recovering the latest TDDS information directly. This is advantageous since, even if the latest TDDS information recorded in the latest TDMA as part of the TDMS information is damaged, the important TDDS information will not be lost since it can recovered from the TAI recorded in the TDMA0. Some or all of the remaining sectors ( 98 ) of the TAI cluster can have a copy of the latest TDDS information stored in the TDDS information field  97 . Each TDDS information is recorded in one sector size. Thus, for instance, if 3 sectors of the TAI cluster are each recorded with the same latest TDDS information, this means that the latest TDDS information is stored three times in the TAI. 
     The latest TDDS information stored in the field  97  of the TAI cluster can be the last TDDS information or the first TDDS information. For instance, if the TDMA corresponding to the TAI cluster becomes the in-use TDMA, then recording in the field  96  is made to indicate that the corresponding TDMA is currently in use. At this time, the first TDDS information recorded in the corresponding TDMA is copied and recorded into the TDDS information field  97  of the TAI cluster as the latest TDDS information. The first TDDS information is recorded in the field  97  because the corresponding TDMA is still in use and is not full at that time. Thus, according to a time point when the TAI is updated, the latest TDDS information recorded in the TAI can be the last TDDS recorded within the corresponding TDMA (e.g., when the corresponding TDMA is full), or can be the first TDDS recorded within the in-use-TDMA (i.e., when the corresponding TDMA is currently available for use). 
     As another example, the latest TDDS information can be copied up to 32 times into the TAI cluster. Any remaining sector of the TAI cluster can be set to a certain value such as 00h if it is not used. Since each TDDS information recording is allotted with one sector size, this means the entire TAI cluster can be recorded with the same latest TDDS information up to 32 times as shown in  FIG. 6B . In this example, the first TDDS information recorded in the corresponding TDMA is recorded 32 times in the TAI cluster. And the recording of the first TDDS information in the TAI cluster is directly used as the TDMA in-use/disc closing indicator of the TAI cluster. This is an example of using the recording of real data (such as the TDDS information) in the TAI cluster to selectively indicate whether or not the TAI cluster is in the recorded state. Thus, the TAI cluster, not only indicates which TDMA is the in-use TDMA or whether or not the disc is closed, but also provides the latest TDDS information associated with the corresponding TDMA. 
     Accordingly, the optical recording/playing-back apparatus can examine the TAI from the loaded disc to determine whether or not the disc is closed. If the disc is closed, the last TDDS information of the disc can be obtained by reading the latest TDDS information recorded in the TAI cluster. Further, the TAI can be examined to identify the location of the in-use TDMA since it indicates which TDMA is currently the in-use TDMA. Further, by accessing and using the “fixed management field” information within the TDDS information recorded in the corresponding TAI cluster, the spare areas can be allocated or not allocated on the disc, and the allocation size of the spare areas and/or TDMAs may be obtained. 
     After that, the recording/playing-back apparatus can move a pickup to the in-use-TDMA area to perform the scan from the beginning of the corresponding TDMA area, thereby confirming the last recorded TDDS. Therefore, the “variable management field” information recorded in the TDDS can be confirmed and the confirmed information can be used to allow the reading of the last TDFL, SRRI (or SBM), thereby reading information on the entire disc recording state and defect areas. 
     Hereinafter, the optical recording and playback method and apparatus using the TAI according to an embodiment of the present invention is discussed. 
       FIG. 7  illustrates a recording/reproducing apparatus according to an embodiment of the present invention. The methods of the present invention can be implemented by the apparatus of  FIG. 7  or other suitable device/system. The recording/reproducing apparatus includes a recording/reproducing unit  10  for performing reproduction and/or recording from/on an optical disc, and a control unit (or host)  20  for controlling the recording/reproducing unit  10 . The control unit  20  sends a record command or a reproduce command for a specific area on the disc to the reproducing unit  10 . The recording/reproducing unit  10  performs the recording/reproduction in the specific area according to the command of the control unit  20 . The recording/reproducing unit  10  can employ an optical drive. 
     The recording/reproducing unit  10  can include an interface unit  12  for performing communication with an external device such as the control unit  20 ; a pickup unit  11  for directly recording or reproducing data to/from the optical disc; a data processor  13  for receiving the reproduction signal from the pickup unit  11  to convert the receive signal into appropriate signal values, or for modulating a to-be-recorded signal into an appropriate recording signal for the optical disc; a servo unit  14  for controlling the pickup unit  11  to precisely read the signals from the optical disc, or to precisely record the signals on the optical disc; a memory  15  for temporarily storing a variety of information including the management information and data; and a microprocessor  16  for controlling the operations and structural elements within the unit  10 . 
     A description of a disc playback method using the TAI in a recording/reproducing apparatus according to any embodiment of the present invention is now provided referring to  FIG. 8 . 
     As shown in  FIG. 8 , if the write-once optical disc is loaded in the optical recording/reproducing apparatus, the apparatus moves to the TDMA0 of the disc to read the TAI (S 10 ). It is determined whether or not the loaded disc is closed by examining the TAI information, particularly, the DMA disc-closing indicator of the TAI (S 20 ). 
     At this time, if it is determined that the disc is closed since the DMA disc closing indicator cluster is in the recorded state, the apparatus moves the pick-up unit to a designated area (e.g., a DMA) to read the last recorded management information (S 30 ). In case where the disc is closed as described above, recording on the disc can no longer be performed. Therefore, the management information is utilized to perform the playback of data (S 40 ). On the other hand, if it is determined that if the disc is not closed, the recording/reproducing apparatus moves to the in-use-TDMA indicated by the TDMA in-use indicator cluster(s) of the TAI to read the management information including the latest TDDS information recorded in the in-use-TDMA (S 50 ). Such TDDS information may also be obtained from the TAI. Also the recording/reproducing apparatus first reads the “fixed management field” information from the TDDS recorded in the TAI to obtain information on the entire disc structure and the like and then, can also move to the currently in-use TDMA area to read the latest “variable management field” information. 
     As described above, after the last management information of the disc is read, the data is recorded or played-back according to a user&#39;s selection or as needed (S 60 ). 
     Applying the method of  FIG. 8  to the apparatus of  FIG. 7 , if the optical disc is loaded, the recording/reproducing unit  10  obtains a variety of recorded disc information from the loaded optical disc. Specifically, if the loaded optical disc is the write-once optical disc, for example, BD-WO, the microcomputer  16  accesses the TAI and obtains the TAI information recorded in the TDMA0 area in order to determine whether or not the loaded disc is closed and to obtain the location of the in-use-TDMA. 
     If the disc is determined to be closed in view of the TAI information, the recording can be no longer performed on the disc. Therefore, the recording/reproducing unit  10  performs the disc playback through a playback command of the control unit  20  under the control of the microcomputer  16 . If the disc is not closed in view of the TAI information, the location of the in-use-TDMA to obtain the last TDMS information recorded in the in-use TDMA is obtained from the TAI, and the obtained TDMS information is utilized to perform the playback by the recording/reproducing unit  10  under the control of the microcomputer  16  according to a playback command of the control unit  20 . 
     On the other hand, a method for recording the TAI using the optical recording/reproducing apparatus of  FIG. 7  according to an embodiment of the present invention is described as follows. 
     The microcomputer  16  within the playback unit  10  records the TDMS information to the plurality of TDMAs in a specific use sequence. For example, the TDMA0 first is used. If the TDMA0 is fully used up, the TDMA1 in-use indicator cluster of the TAI within the TDMA0 is changed to be in the recorded state to indicate that the TDMA1 is currently in use. The recorded state of the TDMA1 in-use indicator cluster can be realized by recording the recorded TDDS information already recorded in the TDMA0 or some other designated data as discussed above. 
     In case where there is no longer any cluster to be recorded or the disc is closed by a closing command of the control unit  20  according to a user&#39;s request or like while recording is performed, the microcomputer  16  controls to transfer and record the latest TDMS information, which is recorded in the latest TDMA, into each of the DMAs (duplicate recording for redundancy purpose), and controls to change the DMA disc closing indicator cluster of the TAI to be in the recorded state. 
     When the disc is in an idle state or in a disc eject state after the disc recording is all finished, the location of the in-use-TDMA is determined such that the above operation can change the specific cluster within the corresponding TAI to be in a batch record state. 
     As described above, the present invention has an advantage in that the write-once optical disc is efficiently used through a method for recording and using the TAI including both the TDMA in-use indicator(s) and the disc closing indicator. By accessing the TAI initially, the identity of the in-use TDMA at that time can be quickly obtained, information on whether or not the disc is closed can be easily obtained, and management information such as the latest TDDS information can also be easily obtained. 
     It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Technology Category: 3