KR20050094733A - Method of recording / reproducing in high density optical disc and apparatus of the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to high density optical discs, and more particularly, to an apparatus and method for recording and reproducing data using a high density optical disc such as a Blu-ray Disc. According to the present invention, in a high density optical disc allocated into a lead-in area, a data area, and a lead-out area, the PAC area in the high density optical disc is allocated, and a PAC recorded in the PAC area is used for the high density optical disc. By controlling logical superposition recording, there is an effect of efficiently recording and reproducing data on a high density optical disc.

Description

Method and apparatus for recording and reproducing high density optical discs {Method of recording / reproducing in High density optical disc and Apparatus of the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to high density optical discs, and more particularly, to an apparatus and method for recording and reproducing data using a high density optical disc such as a Blu-ray Disc.

As optical recording media, optical discs capable of recording large amounts of data are widely used. Among them, recently, a new high-density optical recording medium (HD-DVD) capable of recording and storing high-definition video data and high-quality audio data for a long time, for example, Blu-ray Disc (hereinafter referred to as "BD"). ) Is being developed.

Blu-ray Disc (BD), the next-generation HD-DVD technology, is a next-generation optical recording solution that can contain data that significantly surpasses the existing DVD. Recently, the world's standard technical specifications with other digital devices have been established.

In relation to the Blu-ray Disc (BD), various standard proposals have been prepared, followed by a rewritable Blu-ray Disc (BD-RE), a write once-only Blu-ray Disc (BD-WO), and recording-only playback-only blue. Various standards for ray discs (BD-ROMs) are being prepared.

Recently, the Blu-ray Disc (BD-RE / R / ROM) is a recording and reproducing method in the course of the standardization step. If a new function of the Blu-ray Disc is to be introduced into a new version, the existing version is supported. Physical Access Control (PAC) method is being discussed to solve the problem caused by the failure of the drive to support this.

Accordingly, an object of the present invention was created in view of the above situation, and proposes a PAC method and a data recording and reproducing apparatus and method using the same in a high density optical disc.

Another object of the present invention is to propose an efficient management method of a PAC for controlling logical overlapping (LOW) among high density optical discs, especially in a write once high density optical disc.

Another object of the present invention is to propose an optical recording and reproducing apparatus for recording and managing data using the PAC.

The recording and reproducing method of the high density optical disc according to the present invention for achieving the above object, in the high density optical disc allocated to the lead-in area, data area, and lead-out area, the PAC area in the high density optical disc is allocated And logically superimposing recording of the high density optical disc by using the PAC recorded in the PAC area.

A recording / reproducing method of a high density optical disc according to the present invention is a high density optical disc which is divided into a lead-in area, a data area, and a lead-out area, wherein the PAC area in the high density optical disc is allocated and recorded in the PAC area. And management information for a logically superposed recorded area of the high density optical disc.

A data recording method according to a command of a host of a high-density optical disc according to the present invention is characterized by recording control information on whether to allow logical overlapping of the data recording method in the PAC area of the optical disc.

In the method of recording and reproducing data on an optical disc according to a command of a host according to the present invention, the management information including the PAC information in the high density optical disc is read and stored, and the identified PAC_ID is recognized by checking the PAC_ID of the PAC information. If it is impossible, the logical overlapping recording and the logical overlapping recording area are controlled according to the Unknown PAC Rules and Segment information recorded in the PAC.

The recording and reproducing apparatus of the high density optical disc according to the present invention includes a memory in which the PAC information in the high density optical disc is read and stored, and the PAC_ID of the PAC information is checked, and if the identified PAC_ID is not recognized, the Unknown PAC Rule recorded in the PAC. And a microcomputer for performing control on the logical overlapping recording and the logical overlapping recording area according to the segment information.

Best Mode for Carrying Out the Invention A preferred embodiment of a method and apparatus for recording and reproducing a high density optical disc according to the present invention will now be described in detail with reference to the accompanying drawings. In addition, the term used in the present invention was selected a general term that is widely used at present, but according to the emergence of a new technology, the term that the applicant deemed most appropriate in the present invention was arbitrarily used, and the meaning of the term in the corresponding description. It will be explained clearly. Therefore, in the understanding of the present invention, it is intended that the present invention should be understood as the meaning of terms rather than simple names of terms.

1 is a view showing a PAC region in a high density optical disc according to the present invention.

As shown in FIG. 1, a high-density optical disc according to the present invention has a lead-in zone, a data zone, and a lead-out zone in the circumferential direction from the inner circumference of the disc. Classification is assigned.

In the lead-in area, an information 2 (INFO 2) area and an information 1 (INFO 1) area in which various types of management information of the disc are recorded are allocated, and the PAC according to the present invention is allocated to the information 2 area and the information 1 area. Physical Access Control) zones are present.

In this case, the PAC area allocated to the info 2 area is called a PAC 2 area for convenience, and the PAC area allocated to the info 1 area is called a PAC 1 area. At this time, the original PAC is recorded in one of the PAC 2 area and the PAC 1 area, and the other is used as a back up area in which a copy of the original PAC is recorded. In consideration of the recording direction, the area where the original PAC is recorded is preferably PAC 2 area, and the area where the backup PAC is recorded is PAC 1 area.

The PAC area is an area for solving a problem that may occur because a function added in a new version of the drive is not recognized by the previous version of the drive. For this purpose, the PAC area has an "unknown rule" for the drive of the conventional version. .

The " unknown rule " defines a rule for controlling predictable operations on a disk, that is, basic control such as reading and writing, linear replacement of a defective area, and logical overwrite. do. To this end, a region on the disk to which the "unknown rule" is applied is placed, and the region includes a segment in which the entire disk or a predetermined portion of the disk is defined. (More details on this will be described later.) .)

Therefore, the new version of the optical disc drive defines an area on the disc that the conventional version of the drive can access through the "unknown rule", thereby reducing unnecessary access operations of the conventional version of the drive.

This PAC also defines the accessible area on the disk for the older version of the drive in the physical area on the disk, thus more robustly protecting the data area on which user data is written, hacking and It is possible to block illegal access from the same outside.

On the other hand, the Info 2 area and the Info 1 area in the lead-in area where the PAC 2,1 area exists are described according to the recordable characteristics of the high density optical disc.

2 is a diagram showing the configuration of the info 2 area and the info 1 area of the high density optical disc according to the present invention.

First, as shown in FIG. 2, in the case of a rewritable high-density optical disc (BD-RE) among the high-density optical discs, the Info 2 area includes a 32 cluster PAC 2 area according to the present invention and a 32 cluster DMA (Defect Management Area) for defect management. 2 zones, a 32 cluster CD (Control Data) 2 area in which control information is recorded, and a 32 cluster BZ (Buffer Zone) 3 area as a buffer area, including 256 clusters.

In addition, the Info 1 area includes a 32 cluster BZ2 area as a buffer area, a 32 cluster drive area as a drive area for storing drive-specific information, a DMA 1 area as a 32 cluster as a defect management area, and control information. It is composed of a CD1 area of 32 clusters to be recorded and a BZ1-PAC1 area of 32 clusters which are buffer areas and are utilized as PAC areas according to the present invention.

In the case of a write once high-density optical disc (BD-R), the Info2 area is composed of 256 clusters including the PAC 2 area, the DMA 2 area, the CD 2 area, and the BZ 3 area in 32 clusters. The area 1 is composed of 256 clusters including 32 zones of BZ 2 area, DMA 1 area, CD 1 area, BZ1-PAC1 area, and 128 cluster drive area.

In the case of a high-density optical disc (BD-ROM) for exclusive use of reproduction, 256 clusters including 32 clusters of PAC 2 area, CD 2 area, and BZ 3 area are provided in the Info 2 area, and the Info 1 area is 32 clusters. It consists of 256 clusters including each CD 1 area and the BZ1-PAC1 area.

As described above, the PAC area according to the present invention is allocated to have a size of 32 clusters in the Info 2 area and the Info 1 area in the lead-in area according to the recordable characteristics of the high density optical disc.

A PAC region having a size of 32 clusters is allocated such that one PAC has a size of one cluster, which will be described below with reference to FIG. 3.

3 is a view showing a structure in which a PAC is recorded on a disc in the high density optical disc according to the present invention.

As shown in FIG. 3, one PAC having a size of one cluster (32 sectors) is largely composed of a header area and a specific information area unique to the optical disc drive.

At this time, 384 bytes are allocated to the first 1 sector of the PAC in the header area of the PAC to record various PAC information such as an "unknown PAC rule" and information about a segment, and the optical disc drive having a so-called "known rule" in the remaining area. Specific specific information is configured to be recorded.

Referring to Figure 4 attached to the structure according to an embodiment of the PAC recorded in such a form as follows. For convenience of description, specific fields requiring more detailed description of the PAC will be described with reference to the drawings showing the corresponding fields.

4 is a diagram illustrating a structure of a PAC in a high density optical disc according to an embodiment of the present invention.

As shown in FIG. 4, the PAC according to the present invention has common header for all PACs that are commonly applied to all PACs, and drive specific information (PAC Specific Information). It is divided into areas to be recorded.

The header part is again 4 bytes of "PAC_ID", 4 bytes of "Unknown PAC Rules", 1 byte of "Entire Disc Flag", 1 byte of "Number of Segments", and total of 32 "segments" of 8 bytes each. (Segment_0 to Segment_31) ".

The "PAC_ID" is a field for providing a status and identification code of the current PAC. For example, in the case of the '00 00 00 00 'bit, it indicates that the current PAC is not used and the' FF FF FF FE 'bit. It indicates that the current PAC area is unavailable due to defects, and in the case of the 'FF FF FF FF' bit, the current PAC area is used as a code indicating that it is used in the past but can be used again.

In addition, it is recorded as a predetermined bit such as the '54 53 54 00 'bit, so that it is utilized as a code for checking whether the current drive is a freely accessible disk. That is, if the current drive does not know the "PAC_ID" input as described above, it is determined that the current PAC is not understood because of a different version or the like, so that the information recorded in the "Unknown PAC Rules" field is referred to. It is used as code.

In addition, the "Entire Disc Flag" field is used as a field indicating that the PAC is applied to the entire disc area, and the "Number of Segments" field is a field indicating the number of segment areas to which the PAC is applied.

In addition, up to 32 segments may be allocated in one PAC, and information about the allocated segments is recorded in fields of 8 bytes of "Segment_0" to "Segment_31", respectively. In the "Segment_0 to 31" fields, the first PSN and the last PSN of the allocated segment area are recorded.

A more detailed description of the segment will now be described with reference to the accompanying drawings.

5 is a view showing a segment region in the high density optical disc according to the present invention.

As shown in FIG. 5, up to 32 segment areas to which a PAC is applied in the high density optical disc may be sequentially allocated from the "segment 0" area as needed.

At this time, the first physical sector number (The first PSN) indicating the start position of the allocated segment region and the last physical sector number (The last PSN) indicating the last position are recorded in the "Segment" fields of the PAC 2 and PAC 1 regions. It allows the optical disc drive to locate the segment area.

The allocated plurality of segments do not overlap each other and the start and end positions are allocated to the boundary area between clusters.

Meanwhile, as described above, the "Unknown PAC Rules" field of FIG. 4 is used as a field for specifying an operation range of a drive that does not understand the current PAC. Referring to FIG. 6A to FIG. same.

6A to 6B are diagrams illustrating the configuration of an "Unknown PAC Rules" field according to the present invention.

First, as shown in FIG. 6A, it is possible to define whether or not various areas of the disc can be controlled through the "Unknown PAC Rules" field. At this time, "Area" on the table represents a controllable area in the disk, "Control" area represents a control type such as read / write, and "Number of bits" represents the number of bits required for control. The bits added in the "Number of bits" indicate the case of a dual layer disc having two recording / reproducing surfaces.

For example, this may indicate that read and write control of the PAC area itself is possible through the "PAC zones 1,2" field, and through the "DMA Zone 1,2" field. It may indicate that write control of the defect management area is possible. In addition, the "Replacement Clusters" field may indicate that write control of a replacement area of a defective area is possible. The "Data Zone" field may be used to control read and write of the data area through the "Logical Overwrite" field. May indicate that logical overlapping write control is possible.

Of course, the write control may be applicable to the case where the high-density optical disc is a physically recordable disc (BD-RE, BD-R), and in the case of the write control for the replacement area of the defective area, BD-RE, BD-R). Also, the above logically superimposed recording can be applied to a write once high density optical disc (BD-R) having such superimposed recording characteristics. Accordingly, it will be appreciated that the contents of the present invention should be understood according to the recording characteristics of the high density optical disc.

In this way, it is possible to designate a controllable area on the disc for a drive with a mismatched version by utilizing the "Unknown PAC Rules" field. In addition, this method is not only for the drive of the mismatched version, but also access control of a specific area in the physical area on the disc (record / play control or read / write control, mixed herein) at the user's choice. It may also be used for such purposes.

In this regard, according to the present invention, among the access control for the various areas allocable on the disc, in particular, for a high-density optical disc recordable once, the control on the logical overlapping recording and the access control method on the logical overlapping recorded area To this end, the logical overlapping recording method will be described first, followed by an access control method for the logical overlapping recording area and a logical overlapping recording control method through the "Logical Overwrite" field. (It will be described with reference to FIGS. 6A to 6B and FIG. 7 as necessary.)

7 is a view showing a logically superimposed recording method of a write once high density optical disc according to the present invention.

As shown in FIG. 7, a lead-in zone, an inner spare area, a user data area, an outer spare area, and a lead-out area are shown in FIG. 7. In a once-writable high-density optical disc (BD-WO), which is divided into out zones, recording management information according to data recording can be updated as many times as necessary during use of the disc.

Therefore, a temporary disc management area (TDMA: TDMA) is provided in the lead in area to record management information of an optical disc that can be updated several times in the optical disc. In the TDMA, a temporary defect list (TDFL) is recorded. The TDFL includes a List of defects composed of a plurality of DeFect List entries in which management information such as position information of an actual defect area or an overlapped recorded area is recorded.

In the case of an optical disc that has been allocated as described above, if there is already recorded area (Original recorded data) in the data area, the area is not allowed to 'overwrite' physically due to the characteristics of the optical disc that can be written once. something to do.

However, when a recording command such as a host according to a user's request requests recording to be performed in the a-b area (recorded area) as shown in FIG. 7, a method of alternatively recording the data in another area of the data area is used.

Therefore, the host or the like can issue a recording command regardless of whether or not the specific area of the disc has been recorded. This means that the user or the like can use the rewritable optical disc even though it is an optical disc that can be written once. This is distinguished from physical overlapping records and is called logical over-write (LOW).

That is, in performing a recording command for the ab area as shown in FIG. 7, since the physically recorded part is already recorded, the data cannot be superimposed again in the corresponding area, but this is in the data area and the spare area. The recording is performed in the cd area, and the management information thereof is recorded in the TDMA in the disk as the TDFL information, thereby completing the execution of the recording command.

In this case, necessary superimposition recording management information is processed in the same manner as the replacement type (CRD, Consecutive Re-allocation Defect) of the continuous defect cluster. In other words, the physically recorded a-b area is regarded as if it is a defective area, and data to be recorded in the area is alternately recorded in the spare area.

In the case of the replacement (CRD) type of the continuous defect cluster, management information recorded in the TDMA can be expressed using two DFL entries. As shown in FIG. 7, "status 1" for one entry may be represented. The field contains information on the type of each DFL entry as information on whether or not to be recorded alternately (for example, if '0000', the defective area is normally overwritten by the RAD (Re-allocation Defective) type or CRD (Consecutive Re-). "Defective Cluster first PSN" means a DFL entry of allocation Defect), and '0001' means a DFL entry of NRD (Non-Reallocatable Defect) type, which is a defective area but no replacement area is designated for replacement recording. Field is used to record the location information of the cluster in which the defect has occurred. In this case, the location information is recorded as the first physical sector number (PSN) of the cluster.

In addition, in the "status 2" field, together with the "status 1" field, information on the type and attribute of each DFL entry (for example, '0000' indicates a case where a defect occurs in one cluster. '0001' records the start of a number of consecutive fault clusters, and '0010' means the end of a number of consecutive fault clusters). The field "Replacement Cluster first PSN" indicates the fault. The area records the location information of the area where the area is alternately recorded into the spare area, and the location information is recorded as the first physical sector number (PSN) of the cluster.

In addition, information on the type of each DFL entry is represented in the "status 1" and "status 2" fields using another entry (especially in the "status 2" field of the second entry). '0010' bit will be written indicating the end of the defective cluster and the alternate cluster). In the "Defective CLuster first PSN" field, the first physical sector number (PSN) of the last cluster among the location information of the defective cluster is displayed. In the " Replacement Cluster first PSN " field, the first physical sector number (PSN) of the last cluster is recorded among the position information of the region where the defective area is replaced and recorded into the spare area.

In the example of FIG. 7 illustrating an overlapping recording method using the entry format according to the present invention having such a structure, '0000' which means that replacement recording has been made in the "status 1" field of the first entry (DFL entry 1). Is recorded, and 'a', which is the first physical sector number of the defective cluster, will be recorded in the "Defective Cluster first PSN" field.

Also, '0001' is recorded in the field "status 2", which means the start of consecutive defect clusters, and in the field "Replacement Cluster first PSN", 'c, which is the first physical sector number of the position where the defective area is replaced and written into the spare area. Will be written.

In addition, '0000' indicating that an alternative recording has been recorded is recorded in the field 'status 1' of the second entry (DFL entry 2), and 'b', which is the first physical sector number of the last cluster of the defective cluster, is recorded in the field 'Defective Cluster first PSN'. 'Is recorded,' status 2 'field is written' 0010 'which means the end of consecutive fault clusters, and' Replacement Cluster first PSN 'field is the first of the last cluster where the defective area is recorded and replaced into the spare area. The physical sector number 'd' will be recorded.

Therefore, when a host or the like requests reproduction of the a-b area at the request of the user, the reproduction of the c-d area may be performed by referring to the information recorded in the TDMA area.

In the logical overlapping recording method according to the present invention made through such a method, the original recorded area may be an area allocated to a segment area (ex, segment 0).

Therefore, according to the present invention, even when the area where the logical overlapping recording is made as such is assigned to the segment area or when the unknown PAC rule for the entire disc area is applied, the data to be physically recorded in the ab area is recorded in the cd area. Although the host and the like are recognized as data superimposed and recorded in the ab area, the cd area is defined to be processed in the same manner as the access control content by the PAC applied to the segment 0 area. For the sake of brevity, the ab area in which the data is recorded is referred to as a logical overlapping recording area, and the cd area is referred to as a logical overlapping recording area.)

That is, for example, if the current drive does not know the recognized PAC_ID, such as when a disk on which a data is written in a higher version drive is loaded in a lower version drive, the loaded disk is determined by an unknown PAC rule. The segment area (or the whole disk), which is an area on the disk to which the unknown PAC rule is applied, includes a logically overlapped recorded area, so that the logically overlapped recorded data is separated from the segment area. Even if recorded in the spare area, the logical overlapped recorded area is processed in the same manner as the access control content by the unknown PAC rule of the corresponding segment area.

Meanwhile, according to the present invention, information for limiting the logical overlapping write is defined in an unknown PAC rule of a PAC for a drive having a mismatched version, which will be described below with reference to FIGS. 6A to 6B.

First, the information for limiting the logical overlapping recording is recorded through the "Logical Overwrite" field of FIG. 6A.

To this end, according to the present invention, by allocating 1 bit to the "Logical Overwrite" field, if the bit is '1', logical overlapping of the recorded area on the disk is possible. Indicates that logical overlapping recording for the recorded area on the disc is not allowed.

Therefore, when the current drive does not know the PAC_ID of the inserted optical disc, it is determined whether to control the logical overlapping by referring to the bits recorded in the "Logical Overwrite" field of the unknown PAC rule.

Meanwhile, FIG. 6B is a diagram illustrating a case where two bits are allocated to the "Logical Overwrite" field.

As shown in FIG. 6B, two bits are allocated to the "Logical Overwrite" field, and if the bit is '00', physical overwrite is allowed. Logical nested writes are allowed for ',' '10' indicates that logical nested writes are not allowed for the recorded area on disk, and '11' bits are reserved for future use. Leave as.

That is, in the case of FIG. 6B, the case of the overwrite of the high-density optical disc BD-RE that can be physically rewritten in addition to the high-density optical disc that can be written once is considered.

On the other hand, Figure 8 is a diagram showing the structure of the PAC in the high-density optical disk according to another embodiment of the present invention.

As shown in FIG. 8, a structure of a PAC according to another embodiment of the present invention is divided into a header portion and a specific information area unique to a drive. The header portion includes four bytes of "PAC_ID", two bytes of "Unknown PAC Rules", 1 byte of "PAC Header Tag", 1 byte of "Entire_disc_flag", 2 bytes of "Byte address for the Main Set of Segments", 2 bytes of "Number of Segments defined in the Main Set (N_M_Segs)", 2 bytes of It consists of a "Byte address for the Additional Set of Segments", a 2-byte "Number of Segments defined in the Additional Set (N_A_Segs)" field, and specifically "Unused Part in the specific PAC" in the drive specific information area. Has a field.

As such, in the structure of a PAC according to another embodiment of the present invention, two bytes are allocated for an "Unknown PAC Rule" field, and a main segment set and an additional segment set are provided. It is characterized by. That is, an additional segment area is used when additional segment areas are additionally allocated to 32 segment areas.

To do this, record the number of defined main segments through the "Number of Segments defined in the Main Set (N_M_Segs)" field, and record the starting position in the "Byte address for the main Set of Segments" field. Release. That is, the information recorded in the "Byte address for the main Set of Segments" field serves as a pointer of the defined main segment area.

In addition, the number of additional segments defined is recorded through the "Number of Segments defined in the Additional Set (N_A_Segs)" field, and a start position thereof is recorded in the "Byte address for the Additional Set of Segments" field.

In this case, the additional segment area is allocated to the area N_A_Segs in an unused part in the specific PAC area of the specific information area unique to the drive in one PAC area recorded in the size of one cluster. do.

If such a PAC structure is used, the segment area can be additionally managed as necessary in addition to the 32 segment areas.

Meanwhile, as mentioned above, the "Unknown PAC Rules" field of 2 bytes is used as a field for specifying an operation range of a drive that does not understand the current PAC, which will be described with reference to FIGS. 9A to 9B. Is as follows.

9A to 9B are diagrams illustrating a configuration of an "Unknown PAC Rules" field according to another embodiment of the present invention.

First, as shown in FIG. 9A, the "Unknown PAC Rules" field according to another embodiment of the present invention uses read / write control of a data zone on a disk using one byte and uses the following one byte. By using the following 1-bit, the control of the read / overlapping write in the PAC area is displayed, and the control content of the logical overwrite according to the present invention is displayed.

That is, by assigning a '1' bit to a logical overwrite, the bit is 1, indicating that the logical overlap is allowed. If the bit is '0', the logical overlap is not allowed. .

Meanwhile, as shown in FIG. 9B, the "Unknown PAC Rules" field according to another embodiment of the present invention allocates two bits for the "Logical Overwrite" field. When the bit is '00', the physical overlapping recording is performed. (Physical Overwrite) is allowed, '01' means that logical overlapping is allowed, '10' means that logical overlapping is not allowed, and if '11' it is reserved for future use. ) Bit.

Such a case is considered even in the case of a rewritable high-density optical disc (BD-RE), which has been described above.

On the other hand, Figure 10 is a block diagram showing the configuration of an optical recording and reproducing apparatus for implementing the technical idea according to the embodiment of the present invention.

As shown in FIG. 10, the optical recording and reproducing apparatus according to the present invention includes a recording / reproducing device 10 for recording and reproducing an optical disk, and a host or controller 20 for controlling the recording / reproducing device 10. (The recording and reproducing section 10 is often referred to as " optical disk drive ", and it is clear that this is used interchangeably herein.)

That is, the host 20 issues a recording or reproducing command to a specific area of the optical disc to the recording and reproducing section 10, and the recording and reproducing section 10 records and reproduces to a specific area according to the command of the host 20. Will be operated to perform

In this case, the recording and reproducing unit 10 specifically includes an interface unit 12 which communicates data and commands with the host 20, and records or reads data directly on an optical disc. A pickup processor 11 and a data processor 13 for receiving a signal read out from the pickup unit 11 and restoring the signal to a desired signal value, or for modulating a signal to be recorded into a signal recorded on an optical disc. And a servo unit 14 for controlling the pick-up unit 11 to accurately read signals from the optical disc or to accurately record signals on the optical disc, and a memory 15 for temporarily storing various information and data including management information. ) And a microcomputer 16 that controls the components in the recording and playback section 10.

A method of recording a PAC according to the present invention on a high-density optical disc recordable using the optical recording and reproducing apparatus configured as described above is as follows.

Initially, when an optical disc is inserted into an optical recording and reproducing apparatus, all management information in the optical disc is read out and stored in a memory in the recording and reproducing section 10, and these management information is utilized in recording and reproducing the optical disc.

In this state, when the user wants to record in a specific area of the optical disc, the host 20 transfers the data to the recording / playback section 10 with the data to record the desired position information as a recording command.

The microcomputer 16 in the recording / reproducing section 10 receives the recording command and checks whether or not the area in the optical disc to which the host 20 wants to record is a defective area or the like from management information stored in the memory 15. Then, data is recorded in the area other than the defective area by the write command of the host 20.

At this time, the microcomputer 16 of the recording / reproducing section 10 includes a new feature in which the recording on the entire disc or the specific area is not included in the conventional version of the recording / reproducing apparatus. When it is determined that the playback apparatus does not recognize or when the user wants to limit a function such as recording or playback of a specific area on the disc according to a user's request, control information about the area is stored in a PAC zone on the disc. PAC rule ".

At this time, if the recorded PAC is control information for the entire disc area, the " Entire Disc Flag " field is recorded, and at least one segment area, which is a predetermined area on the disc, is allocated to control access to the entire area. In this case, the number of segment areas allocated to the "Number of Segment" field is recorded, and control information such as accessibility is recorded in the "Data Zone" field of the "Unknown PAC Rule". In addition, when control is desired for each segment area, the control content and position information of the segment are recorded in the "Segment" field.

In this case, in particular, when the host 20 or the like wants to record the control items for the logical overlapping recording for the drive that does not match the version, the control items are recorded in the "Logical Overwrite" field of the "Unknown PAC Rule".

The PAC is recorded in the size of one cluster in the PAC 2 area of the Info 2 area, and the PAC and a copy thereof are recorded in the PAC 1 area of the Info 1 area for backup.

To this end, the microcomputer 16 transfers the position information and data of the area where the data is recorded or the PAC area to the servo 14 and the data processor 13, and through the pickup unit 11, a desired position in the optical disc. Allow the record to complete.

On the other hand, a method of recording and reproducing a high-density optical disc on which a PAC is recorded in this manner is as follows.

Initially, when an optical disc is inserted into an optical recording and reproducing apparatus, all management information in the optical disc is read out and stored in a memory in the recording and reproducing section 10, and these management information is utilized in recording and reproducing the optical disc.

In this case, the information stored in the memory 10 includes location information of various areas including the PAC area on the disc. Thereafter, the PAC_ID of the PAC in the PAC region is checked to determine whether the PAC_ID is a recognizable PAC_ID.

If the recorded PAC_ID is recognizable as a result of the check, it is determined that the version is the same as that of the recording / reproducing apparatus which records the data on the disk or there is no separate recording / reproducing, and then recording / reproducing is performed according to the command of the host 20. .

In addition, when the code recorded in the PAC_ID is not recognized, it is determined that there is a recording / playback restriction due to the version being recorded by another recording / playback device, and in this case, the "Unknown PAC Rules" and "Segment" Recording / reproducing is performed in accordance with the command of the host 20 with reference to the recording / reproducing limitation area on the recorded disc. At this time, in particular, the control of the logical overlapping recording and the logical overlapping recording area is performed according to the present invention.

To this end, the microcomputer 16 transmits the position information and data according to the command of the host to the servo 14 and the data processor 13, and records / reproduces at a desired position in the optical disc through the pickup unit 11. Allow this to complete.

As described above, the recording and reproducing method and apparatus for the high density optical disc according to the present invention have the following effects.

First, the PAC is used to define the accessible area on the disk for the previous version of the drive in the physical area on the disk, thereby more robustly protecting the data area in which user data is recorded, hacking and It is effective in blocking illegal access from the same outside.

Second, there is an effect of efficiently recording and reproducing data on a high density optical disc by using a PAC that manages the entire data area or the segment area on the disc.

Third, the present invention provides an effect of efficiently recording and reproducing data on a high-density optical disc by providing a logical overlapping recording control for an area managed by a PAC on a disc and an access control method for the logical overlapping recorded area.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

1 shows a PAC region in a high density optical disc according to the present invention.

2 is a view showing the configuration of an info 2 area and an info 1 area of a high density optical disc according to the present invention;

3 is a view showing a structure in which a PAC is recorded on a disk in the high density optical disk according to the present invention;

4 is a diagram showing the structure of a PAC in a high density optical disk according to an embodiment of the present invention;

5 is a view showing a segment region in the high density optical disk according to the present invention;

6a to 6b are views showing the configuration of the "Unknown PAC Rules" field according to the present invention

7 is a view showing a logically superimposed recording method of a write once high density optical disc according to the present invention;

8 illustrates a structure of a PAC in a high density optical disc according to another embodiment of the present invention.

9A to 9B are views showing the configuration of an "Unknown PAC Rules" field according to another embodiment of the present invention.

10 is a block diagram showing a configuration of an optical recording and reproducing apparatus according to the present invention.

-Explanation of symbols for the main parts of the drawing-

10: recording and playback section 11: pickup

12 interface 13 data-processor

14: Servo 15: Memory

16: microcomputer 20: host or control unit

Claims (14)

In the high-density optical disc allocated to the lead-in area, data area, and lead-out area, Allocate a PAC area in the high density optical disc, And recording and reproducing logical overlapping of the high density optical disc by using a PAC recorded in the PAC area. The method of claim 1, And at least one PAC area is allocated in the lead-in area. The method of claim 1, And the high density optical disc has at least one segment area managed by the PAC. The method of claim 1, And the PAC has a " Unknown PAC Rules " field for controlling an operation range of a drive that does not understand the current PAC. The method of claim 4, wherein And the "Unknown PAC Rules" field has a "Logical Overwrite" field for limiting logical overlapping recording. The method of claim 5, 1 bit is allocated to the "Logical Overwrite" field to indicate whether to allow logical overlapping recording. The method of claim 5, 2 bits are allocated to the " Logical Overwrite " field to indicate whether physical overlapping and logical overlapping are recorded. In the high-density optical disc allocated to the lead-in area, data area, and lead-out area, Allocate a PAC area in the high density optical disc, And recording management information on a logically superposed recorded area of the high density optical disc in a PAC recorded in the PAC area. The method of claim 8, And said management information is access control information for said logically superimposed recorded area. The method of claim 8, And the high density optical disc has at least one segment area managed by the PAC. The method of claim 10, And the logically superimposed recorded area is managed in the same manner as the segment area corresponding to the area where logical superimposed recording is performed. In a method for recording data on an optical disc in accordance with a command of a host, The control method for recording and reproducing a high density optical disc, characterized by recording control information on whether to allow logical overlapping recording in the data recording method in the PAC area of the optical disc. In the method of recording and playing back data on an optical disc according to a command of a host, Read and store management information including PAC information in the high density optical disc; Checking the PAC_ID of the PAC information, if the confirmed PAC_ID is not recognizable, the high density characterized in that the control of the logical overlapping and the logical overlapping recording area is made according to the Unknown PAC Rules and Segment information recorded in the PAC Recording and reproducing method of optical disc. A memory in which PAC information in a high density optical disc is read and stored; Checking the PAC_ID of the PAC information, and if the confirmed PAC_ID is not recognized, including a micom for performing a logical superimposition recording and control of the logical superimposition recorded area according to Unknown PAC Rule and Segment information recorded in the PAC And a recording and reproducing apparatus for a high density optical disc.