KR20060004486A - Method of recording / reproducing in high density optical disc and apparatus of the same - Google Patents

Abstract

The present invention relates to a high density optical disc, and more particularly, to a method and apparatus for recording and reproducing data using PAC in a high density optical disc such as a Blu-ray Disc. According to the present invention, by allocating a PAC area in which at least one PAC is recorded in a high density optical disc, and controlling the logical overlapping recording of the optical disc by using one PAC among the PACs recorded in the PAC area, the data is efficiently stored in the high density optical disc. It has the effect of recording and playing back.

High Density Optical Disc, PAC, Logical Superposition, LOW PAC, Segment

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}

1A to 1B show 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 view showing the structure of the PAC in the high-density optical disk according to the present invention;

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

6 is a diagram showing the configuration of an "Unknown PAC Rules" field according to the present invention.

7A to 7B illustrate a logically superimposed recording method of a write once high density optical disc according to the present invention.

8 is a view showing the structure of the PAC region in the high-density optical disk according to the present invention;

9 is a diagram illustrating a configuration of an "Unknown PAC Rule" field according to 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

The present invention relates to a high density optical disc, and more particularly, to a method and apparatus for recording and reproducing data using PAC in a high density optical disc such as a Blu-ray Disc.

As optical recording media, optical disks 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.

During this standardization process, if a new feature of the Blu-ray Disc is recently introduced into a new version, the purpose of solving the problem caused by the failure of the legacy drive that supports the existing version is not supported. In this regard, a physical access control (PAC) method has been proposed, and various methods for controlling read / write of data on the entire disk or a specific area using the PAC are performed in the physical area of the disk. Is being discussed.

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.

According to an aspect of the present invention, there is provided a recording and reproducing method of a high density optical disc, by allocating a PAC area in which at least one PAC is recorded in the high density optical disc, and using one of the PACs recorded in the PAC area. It is characterized by controlling the logical overlapping recording of the optical disc.                     

A recording and reproducing method of a high density optical disc according to the present invention is a method of recording and reproducing data on a high density optical disc in response to a command of a host, wherein the management information including the PAC information in the high density optical disc is read and stored, and the PAC_ID is included in the PAC information. When the PAC_ID is not recognizable for a PAC having 'LOW', the logical overlapping recording is limited according to an unknown PAC recorded in the PAC.

The recording and reproducing apparatus of the high density optical disc according to the present invention is a memory in which the PAC information in the high density optical disc is read and stored, and when the PAC_ID is not recognized for the PAC whose PAC_ID = 'LOW' in the PAC information, And a micom that controls logical superposition recording according to the recorded unknown PAC.

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.

In relation to this, the meaning of "PAC (Physical Access Control)" used in the present invention means that on the disc for the purpose of controlling the recording and reproduction of data for the entire disc or specific area in the physical area of the disc. Meaning additional information to be recorded (Additional Information), in the present specification it is named "PAC", "PAC information" or "PAC control information" for convenience, and all are used in the same meaning.

In addition, the area on the disk where the PAC is recorded is named "PAC Zone" for convenience, and the PAC is recorded in cluster units in the PAC area on the disk. We will call it "cluster".

In addition, the PAC according to the present invention has an " unknown rule " for limiting the read / write of data on the entire disk or a specific area for a drive that does not know a specific PAC_ID including a legacy drive. The PAC to which the "unknown rule" is applied is called "Unknown PAC" for convenience, and the PAC to which "PAC specific information" which is a "known rule" applied to the specific PAC_ID is known and recorded in the PAC is applied. For convenience, we call it "Known PAC."

A form in which such a PAC is recorded in the PAC area, and a method and apparatus for recording and reproducing data using the same will be described with reference to the accompanying drawings.

1A to 1B show a PAC area in a high density optical disc according to the present invention.

First, as shown in FIG. 1A, a single layer disc having a recording layer of one of the high density optical discs is largely a lead-in zone and a data zone in the circumferential direction from the inner circumference of the disc. The lead-out zones are separately allocated.

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 area according to the present invention is allocated to the information 2 area and the information 1 area. Each of these exists.

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. PACs recorded in the PAC 1 area and the PAC 2 area are recorded with the same information in case of sudden power-down, and the PAC recorded in the PAC 1 area of the Info 1 is updated first. A copy is recorded in the PAC 2 area of Info 2.

Meanwhile, FIG. 1B is a diagram illustrating a structure of a dual layer disk having two recording layers. As shown in FIG. 1B, the dual layer disk includes a first recording layer (L0: Layer 0) and a second layer. Each recording layer is provided with a recording layer L1 (Layer 1), and each recording layer has a lead-in / out area (also called an inner zone) and a data area. ), Outer zones (Outer Zones 0, 1) are allocated separately.

In the lead-in area (inner area 0) and the lead-out area (inner area 1), an info 2 area and an info 1 area in which various types of management information of the disc are recorded are allocated. Each of the Info2 area and the Info1 area has a PAC area according to the present invention, respectively.

In this case, like the single-layer disc, the PAC area allocated to the Info 2 area of the lead-in and lead-out area is called the PAC 2 area for convenience, and is assigned to the Info 1 area of the lead-in and lead-out area. The PAC region is called a PAC 1 region. PACs recorded in the PAC 1 area of the Info 1 and the PAC 2 area of the Info 2 area are all recorded with the same information, and the PACs recorded in the PAC 1 area of the Info 1 are updated first, and a copy thereof is stored in the Info 2 area. Is recorded in the PAC 2 area.

In this case, as shown in FIG. 1B, since the PAC 1 and PAC 2 regions exist not only in the lead-in region but also in the lead-out region, the dual layer disk has twice the size of the PAC region of the single layer disk. will be.

As mentioned above, the PAC area is for recording / reproducing control of data on the entire disk or a specific area. For this purpose, the PAC area has an “unknown rule” for limiting recording / reproduction of a drive. It is characterized by.

The disk area managed by the " unknown rule " includes a disc management area (DMA) area, a spare area, a user data area, and the like. A segment area, which is a predetermined area on a disk to which unknown rule "is applied, may be divided and allocated. (More details about the segment will be described later.)

In other words, using an "unknown rule", the optical disc capable of linear replacement of a defective area from a basic operation of the above-listed areas, for example, recording, reproducing, etc. It defines a rule for controlling logical overwrite of (BD-WO).

Therefore, a problem (ex, unnecessary access, etc.) that may be caused by not recognizing the function added in the new version of the drive through the "unknown rule" of the PAC recorded in the PAC area in the conventional version of the drive can be solved. By defining the accessible area on the disk in the physical area on the disk, it provides more robust protection to the area where the data is recorded and prevents illegal access from outside such as hacking. A more detailed function will be described later.)

Meanwhile, the info 2 area and the info 1 area in the lead-in area including the PAC 2 area and the PAC 1 area (including the lead-out area in the case of a dual layer disc) will be 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.

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 PAC 2 area having a size of 32 clusters according to the present invention, and DMA (Defect Management) of 32 clusters for defect management. It consists of 256 clusters including an Area) 2 area, a 32 cluster CD (Control Data) 2 area where control information is recorded, and a 32 cluster BZ (Buffer Zone) 3 area which is a buffer area.

In addition, the Info 1 area is a buffer zone (BZ) area of 32 clusters as a buffer area, a drive area of 32 clusters as a drive area for storing drive-specific information, and a DMA 1 area of 32 clusters as a defect management area. And a CD 1 area of 32 clusters in which control information is recorded, and a PAC 1 area according to the present invention.

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

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 PAC 1 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.

In addition, in the case of a dual-layer disc having two recording layers, the PAC area is allocated not only to the lead-in area but also to the lead-out area, so that one PAC area has a size of 64 clusters.

One PAC is allocated to have a size of one cluster in a PAC area having a size of 32 clusters (or 64 clusters), and a plurality of PACs having a size of one cluster may exist as needed. Referring to Figure 3 attached to the form in which one PAC is recorded in the size of one cluster as follows.

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 (a concept such as a frame or a sector) is composed of a header area and a specific information area specific to an optical disk drive. do.

In this case, 384 bytes are allocated to the first 1 frame 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. PAC Specific Information is configured to be recorded.

A detailed structure of the PAC recorded in such a form will be described with reference to FIG. 4. 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 view showing the structure of the PAC in the high-density optical disk according to the present invention.

As shown in FIG. 4, the PAC according to the present invention is largely divided into a header portion (up to 384 bytes of the first frame) and an area in which specific information specific to the PAC is recorded.

The header part is again 4 bytes of "PAC_ID", 4 bytes of "PAC Update Count", 4 bytes of "Unknown PAC Rules", 1 byte of "Entire_Disc_Flag", 1 byte of "Number of Segments", and 8 bytes of each A total of 32 "segments (Segment_0 to Segment_31)" are included.

The "PAC_ID" is a field for providing a status and identification code of the current PAC. For example, if "00 00 00 00h" is recorded, it indicates that the current PAC is not used and is recorded as 'FF FF FF FFh'. If so, the current PAC field is used as code to indicate that it was used in the past but is available again.

In addition, by recording with a predetermined bit such as '54 53 54 00h ', 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 "PAC Update Count" field is a field indicating the number of updates of the PAC. Initially, 0 is recorded, and then incremented by one each time the PAC is re-written.

In addition, the "Entire Disc Flag" field is applied to the entire disc area regardless of whether the segment area is allocated to the Unknown PAC and used as a field indicating whether to allow re-initialization. That is, for example, by utilizing b0 which is one bit of one byte (8 bits) allocated to the "Entire Disc Flag" field, when b0 is 0, it indicates that reinitialization is allowed. A value of 1 indicates that reinitialization is not allowed. Of course, this reinitialization is applied when the recording characteristic of the high density optical disc is rewritable (BD-RE).

In addition, the "number of Segments" field is a field indicating the number of segment areas to which the PAC is applied. Up to 32 segments can be allocated in one PAC. Information about the location of the allocated segments is recorded in 8-byte fields "Segment_0" to "Segment_31". In the fields "Segment_0 to 31", the first physical sector number (PSN) of the first cluster of the segment region is recorded in the first 4 bytes, respectively, and the last physical of the last cluster of the segment region is recorded in the next 4 bytes. The sector number is 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 PAC is applied in the high density optical disc may be sequentially allocated from the "segment 0" area as necessary. That is, up to 32 segments managed by one PAC can be allocated in ascending order from "segment 0", and even when there are a plurality of PACs, the total number of segment areas managed by each PAC is 32. (One optical disc has a maximum of 32 segment areas.)

In this case, the start position of the allocated segment area is the first PSN of the first cluster, and the last position is the last PSN of the last cluster. This is recorded in the "Segment" field so that the optical disc drive can locate the segment area.

At this time, segment areas allocated and managed by one PAC do not overlap each other, and start and end positions are allocated to boundary areas 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.

6 is a diagram illustrating the configuration of an "Unknown PAC Rules" field according to the present invention.

As shown in FIG. 6, it is possible to define whether or not the various areas of the disc can be controlled through the "Unknown PAC Rules" field represented by 4 bytes (32 bits). At this time, "Area" on the table represents controllable areas of the disc, "Bits" represents a control bit, and "Control type" represents a control type such as recording / reproducing.

Through this, the controllable areas of the "Unknown PAC Rules" field will be described. First, "DMA zones (DMA Zones, Disc Definition Structure (DDS) are not included)" present in the Info 1,2,3,4 areas. It is possible to indicate that the recording control is possible for the "Spare Areas" in the Data Zones, and that the recording control is possible. It is possible to control recording and reproducing for the CD (Control Data Zones), and to control recording and reproducing for the "User Data Area" of the data area. "Cluster" may indicate that recording and reproduction control are possible.                     

In this case, the following rules are applied to the remaining areas except for the "PAC cluster".

That is, when the control type is write (ex, Bits = b3, b5, b6, b7, ...), if the allocated bit is set to 0, recording is possible for the corresponding area. When the assigned bit is set to 1, it indicates that recording is not possible for the area.

In addition, when the controllable form is read (ex, Bits = b2, b4, ...), if the assigned bit is set to 0, playback of the corresponding area is possible. When set, it indicates that playback for that area is not possible.

On the other hand, for the "PAC cluster" area, when the controllable form is write (Bits = b1), if the allocated bit is 0, it indicates that the superimposed recording on the current PAC is possible. In addition, if the allocated bit is 1, it indicates that overlapping recording for the current PAC is impossible.

Also, for the " PAC Cluster " area, when the controllable form is read (Bits = b0), if the assigned bit is 0, the play and the contents of the current cluster are transferred to the outside of the drive (ex, host, etc.). Indicates that transmission is possible. In addition, if the allocated bit is 1, the contents of the current PAC cluster (known as a known rule) except for the first 384 bytes (so-called PAC header portion) of the first data frame may not be transmitted to the outside of the drive. It can be set when you want to control only with unknown rule.

In this case, in the case of the user data area, when the segment area, which is a specific area on the disk, is defined, the user data area is used as a field indicating whether recording and reproduction control is possible for the segment area instead of the entire user data area. .

Using the "Unknown PAC Rule" defined above, during recording and playback control of the entire disc or the segment area, particularly for a high-density optical disc (BD-WO) that can be written once, the so-called Logical OverWrite (LOW) A control method will be described, and for this purpose, the logical overlapping recording method will be described first, and a method of controlling this to "LOW PAC" as one of the known PACs according to the present invention will be described.

7A to 7B are diagrams showing a logically superimposed recording method of a write once high density optical disc according to the present invention. (For convenience of explanation, the case of a single-layer disc having one recording layer is taken as an example.)

First, as shown in FIG. 7A, in the case of a write once type high-density optical disc (BD-WO), a lead-in zone, an inner spare area 0 (ISA0: Inner Spare Area 0), and a user data area (User Data Area), Outer Spare Area 0 (OSA0), and Lead-out Zone (OSA0), which are allocated to the recording management information according to data recording on the disc Can be updated as many times as needed during the use of.                     

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 location 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 area A (recorded area) as shown in Fig. 7A, a method of alternatively recording the data in another area in 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 called Logical OverWrite (LOW) to distinguish it from physical overlapping recording of a rewritable optical disc.

That is, as shown in FIG. 7A, since the recording command for the area A is physically already recorded, the overlapping recording cannot be performed again in the corresponding area, but the user data area ( The recording command is completed by alternately recording in the B area, which is a user data area, and recording management information thereof as TDFL information in TDMA on the disk.

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 area A is regarded as if it is a defective area, and data to be recorded in the area is alternately recorded in the area B in the user data area.

In the case of the continuous defect cluster replacement (CRD) type, the management information recorded in the TDMA can be represented using two DFL entries, and as shown in FIG. 7A, "status 1" for one entry. Field is information on the type of each DFL entry, and information on whether or not to be recorded alternately (for example, if '0000', the defective area has been successfully recorded and 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 corresponding 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 location information of the area where the area is recorded is recorded, 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' bits will be recorded indicating that the two defective clusters and the end of the alternate cluster will be recorded. In the "Replacement Cluster first PSN" field, the first physical sector number (PSN) of the last cluster of the position information of the region where the defective region is replaced is recorded.

In the case of FIG. 7A, which illustrates an overlapping recording method using the entry format according to the present invention having such a structure, '0000' means that the alternative recording has been made in the field "status 1" 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.

In addition, in the "status 2" field, '0001' is recorded, which indicates the start of consecutive defect clusters, and in the "Replacement Cluster first PSN" field, 'c', which is the first physical sector number of the location where the defective area is recorded, is recorded. Will be recorded.

In addition, the field "status 1" of the second entry (DFL entry 2) is recorded with '0000' indicating that an alternative recording has been made, and in the field "Defective Cluster first PSN", which is the first physical sector number of the last cluster of the defective cluster. 'b' 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 replacement is recorded. The physical sector number 'd' will be recorded.

Therefore, when the host or the like requests reproduction of the area A according to the user's request, the reproduction of the area B may be performed by referring to the information recorded in the TDMA area.

On the other hand, in such a logically superimposed recording method, when the alternatively recorded area is a user data area, the current recording track is opened in the SRM (Sequential Recording Mode) recording method, which is a recording method of a high-density optical disc that can be recorded once. This is the case when the next recordable area (NWA) exists. That is, the logical overlapping recording is made in the next recordable area, NWA, and after the logical overlapping recording is completed, the next area of the recorded area will be the next recordable area (NWA).

Therefore, when the track to perform the logical overlapping recording is closed (Closed Track), the logical overlapping recording is composed of a spare area in the data area, which is one of RRM (Random Recording), which is one of the recording methods of a high-density optical disc that can be recorded once. Mode) The same applies to the recording method. This is illustrated in FIG. 7B.

As shown in FIG. 7B, the logical overlapping recording may be performed as a spare area in a data area. That is, in the case of the RRM recording method in which a track for performing logical overlapping recording is closed or data recording is randomly recorded in an unrecorded area on a disk, logical overlapping recording is performed to a spare area.

Therefore, the data to be recorded in the A area which is the recorded area on the disc is recorded in the spare area, and this replacement recorded information is recorded in the TDMA area as a DFL entry in the same manner as in FIG. 7A.

According to the present invention, "LOW PAC" with PAC_ID = 'LOW' is placed in order to control such logical overlapping recording. That is, a plurality of valid PACs (valid PACs) may exist in one PAC area as needed. One of the PACs is used as a PAC including control information regarding logical overlapping recording. This will be described with reference to the accompanying drawings.

8 is a view showing the structure of the PAC region in the high-density optical disk according to the present invention.

As shown in FIG. 8, in one PAC area having a size of 32 clusters (PAC Zone of INFO2 or INFO1), a plurality of valid PACs each having a size of 1 cluster are provided as necessary, and the valid PACs are stored. To manage the entire disk or up to 32 segment areas.                     

In this case, the valid PAC is referred to as a "valid PAC (Valid PAC)" because it means the area that actually contains the above-mentioned various types of PAC information, and a valid PAC having a size of 1 cluster is one PAC zone (PAC Zone). ) Can be allocated up to 32 (up to 64 for dual-layer discs).

As described above, the valid PAC indicates a predetermined PAC_ID (ex, PAC_ID = 54 53 54 00h, etc., for convenience, indicated by 'A' or 'B' on the drawing) according to the version of the optical disc drive on which the PAC is recorded. These valid PACs include "Primary PAC" with PAC_ID = 'PRM' and "LOW PAC" with PAC_ID = 'LOW' according to the present invention. In relation to the above, the "Primary PAC" is a kind of "Known PAC" which is a PAC having information on the date when the disc is initialized and recorder ID information.

Therefore, the drive knowing PAC_ID = 'LOW' may perform logical overlapping recording normally (it may be possible to insert control information regarding the logical overlapping recording as a separate specific INFO), but for the drive not knowing the logical overlapping The information that limits the recording is defined in the "Unknown PAC rule". This will be described with reference to FIG. 9.

9 is a view showing a field configuration of the "Unknown PAC Rule" described above. According to the present invention, the write control bits of the "PAC Cluster", "User Data Area", "Control Data Zones", and "DMA Zones" fields of the "Unknown PAC Rule" field configured as shown in FIG. It is characterized by setting.

That is, if bits 1, 3, 5, and 7 of the "Unknown PAC Rule" field are forcibly set to 1, recording of the corresponding area is impossible and logical overlapping recording cannot be performed.

At this time, the "Spare Areas" field indicating whether or not the spare area is to be recorded is not forcibly set to 1. In the case of a spare area, defect management relating to a defect area that can be found at the time of reproduction is required, and when a segment area is allocated to a user data area, even if logical overlapping recording is restricted through the "LOW PAC", This is because logical overlapping recording for areas except the segment area is possible. For the same reason, the "DMA Zones" field indicating whether or not the DMA area is controlled for recording does not include the DDS area.

On the other hand, the remaining PAC area in which the valid PAC is not recorded may be recorded when the PAC_ID is 00 00 00 00h or FF FF FF FFh, and the unrecorded PAC area remains as an unrecorded PAC area. do.

In addition, when a defect occurs in an area where a PAC is to be recorded in one PAC zone, a method of recording a PAC in a next area of the defective area is used. The defect may be caused by factors such as damage or contamination of the disk surface, and when such a defect occurs in an area where the PAC is to be recorded, a method of recording PAC information in the next area after the defective area is used. .

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 / reproducing apparatus, all management information in the optical disk is read out and stored in a memory in the recording / reproducing section 10, and these management information are utilized in recording and reproducing the optical disk.

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 an area other than the defective area according to the recording command of the host 20.

At this time, the microcomputer 16 of the recording / reproducing section 10 is intended to limit the functions such as recording or reproducing the entire disc or a specific area according to a user's request, or a conventional version of the recording / reproducing apparatus. If it is determined that the conventional recording / reproducing apparatus does not recognize the new feature, the control information about the area is recorded in the PAC Zone on the disc as " Unknown PAC rule ".

The PAC information is recorded as a plurality of valid PACs (Valid PACs) in the size of 1 cluster in the PAC 1 area of the Info 1 area as needed, and the backup data is stored in the PAC 2 area of the Info 2 area as a back-up. Record a copy of the PAC recorded in the PAC 1 area.

In this case, particularly, when the host 20 or the like wants to record the control items for the logical overlapping recording for the mismatched drive, bits 1, 3, 5, and 7 of the "Unknown PAC rule" are forced to 1 Create a so-called "LOW PAC" by setting and giving PAC_ID 'LOW'.

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.                     

In this case, in particular, a control for logically overlapping recording is performed for a drive that does not recognize PAC_ID = 'LOW' 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, there is an effect of efficiently recording and reproducing data on a high density optical disc by presenting a logical overlapping recording control method for an area managed by a PAC on a disc.

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

Claims (10)

Allocate a PAC area in which at least one PAC is recorded on a high density optical disc, And a logical superimposition recording of the optical disc using one of the PACs recorded in the PAC area. The method of claim 1, And the PAC area is allocated to the Info 1 area and the Info 2 area of the high density optical disc, respectively. The method of claim 1, And the PAC for controlling the logical overlapping recording is PAC_ID = 'LOW'. The method of claim 3, wherein And the PAC controlling the logical overlapping recording has an Unknown PAC rule for controlling an operation range of a drive that does not recognize PAC_ID = 'LOW'. The method of claim 4, wherein The unknown PAC rule has information for limiting recording in a DMA area, a control data area, a user data area, and a PAC cluster area. The method of claim 5, The recording limitation information on the user data area is information on the segment area when a segment area which is a predetermined area in the user data area is allocated. The method of claim 6, And up to 32 segments are allocated in one optical disc. The method of claim 4, wherein And b1, b3, b5, and b7 bits of the Unknown PAC rule are set to one. In the method of recording and reproducing data on a high density optical disc in accordance with a command of a host, Read and store management information including PAC information in the high density optical disc, And if the PAC_ID is not recognizable with respect to a PAC having PAC_ID = 'LOW' in the PAC information, logical superimposition recording is limited according to an unknown PAC recorded in the PAC. A memory in which PAC information in a high density optical disc is read and stored; The PAC having PAC_ID = 'LOW' in the PAC information, when the PAC_ID is unrecognizable, includes a micom that controls logical overlapping recording according to the unknown PAC recorded in the PAC. Playback device.

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