CN100437803C - Data storage medium having link zone and apparatus and method for recording reproducing data on or from the data storage medium - Google Patents

Abstract

A data storage medium including a link area, an apparatus and method for recording data, and an apparatus and method for reproducing data. The data storage medium includes: a plurality of ECC blocks storing user data; and a plurality of linking areas arranged between the ECC blocks corresponding to the ECC blocks. Additional information on ECC blocks is recorded in the linking area.

Description

Device and method for recording data on or reproducing data from a data storage medium

technical field

The present invention relates to an optical disc, and more particularly, to a data storage medium having a linking area, and an apparatus and method for recording data on or reproducing data from the data storage medium.

Background technique

In general, laser beams have been widely used to record/reproduce data from optical discs. In a recordable optical disc, it is necessary to define an area used as a buffer to correctly read data recorded on a space other than the desired space, and to secure random recording and repeat recording functions. This zone is called a run-in or run-out zone. Since the move-in or move-out zone exists between areas where user data is recorded, this zone is also called a link zone.

However, in the case of a ROM type disc on which data can no longer be recorded, when the move-in or move-out area, that is, the linking area, is directly applied to the ROM type disc to enhance the compatibility of the ROM type disc with the disk drive, the number of recordable spaces is used. Efficiency is reduced. That is, once data is recorded on a ROM type optical disc by a disc manufacturer in an authorization process, the ROM type optical disc cannot be recorded again. Therefore, a linking area provided for repeatedly recording data on a data storage medium occupies only a recordable space on which user data can be prevented from being recorded.

Contents of the invention

Therefore, an aspect of the present invention is to provide a data storage medium having a data structure which can more effectively use a link area and obtain a larger recording space by defining a link area in a ROM type disc while maintaining recordability. disk to disk drive compatibility.

Another aspect of the present invention is to provide an apparatus and method for recording data on a data storage medium, and an apparatus and method for reproducing data from a data storage medium.

Additional aspects and/or advantages of the present invention will be set forth in part in the following description, and some will be clear from the description, or can be learned through practice of the present invention.

In order to achieve the above and/or other aspects of the present invention, a data storage medium is provided, which includes: a plurality of ECC blocks storing user data; and a plurality of links arranged between the ECC blocks corresponding to the ECC blocks district. In this immediate data storage medium, additional information on ECC blocks is recorded in the linking area.

Address information on ECC blocks may be recorded in each linking area.

Additional information corresponding to at least one ECC block may be recorded in at least one linking area.

Additional information on the ECC blocks may be recorded in the respective linking areas a predetermined number of times.

Address information corresponding to at least one ECC block may be recorded in at least one linking area.

Address information on the ECC blocks may be recorded in the respective linking areas a predetermined number of times.

Each linking area may include at least one frame including at least one data field and at least one address field.

All data fields present in the frame may define an ECC frame, which is subject to at least one of ECC encoding and ECC decoding.

All address fields present in one frame may define an address frame subject to at least one of ECC encoding and ECC decoding.

At least a portion of the additional information may be placed at least once in each data field.

At least a portion of address information corresponding to at least one ECC block may be placed in each address field at least once.

The ECC frame may include as many codewords as data fields.

The ECC frame may be a frame obtained by adding null data to additional information, ECC encoding the result of the addition, discarding the null data, and discarding a part of parity obtained by ECC encoding.

In order to achieve the above and/or other aspects of the present invention, there is provided a method of recording data on a data storage medium, the method comprising: setting a linking area on the data storage medium; and recording predetermined information in the linking area.

Recording the predetermined information may include recording additional information corresponding to an ECC block of a data storage medium storing user data.

Setting the linking area may include setting one or more linking areas, and recording the additional information may include placing additional information corresponding to at least one ECC block in at least one linking area.

Recording additional information may include placing additional information in a plurality of link areas.

Recording the additional information may include recording at least a part of the additional information at least once in a plurality of data fields provided in one link area.

Recording the additional information may include: adding null data to the data indicating the additional information and ECC encoding the result of the addition; obtaining an ECC frame by discarding the null data and discarding a part of the parity obtained by the ECC encoding; and Record the ECC frame in.

Recording the ECC frame in the linking area may include recording the ECC frame in a direction opposite to a direction in which codewords of the ECC frame are arranged.

Recording the ECC frame in the linking area may include recording the ECC frame in a plurality of data fields provided in one linking area in a direction opposite to a direction in which codewords of the ECC frame are arranged.

Recording the predetermined information may include recording address information on an ECC block of a data storage medium storing user data.

Recording the address information may include placing address information corresponding to at least one ECC block in the linking area.

Setting the link area may include setting a plurality of link areas, and recording address information may include placing address information in each link area.

Recording the address information may include placing at least a part of the address information at least once in a plurality of address fields set in the link area.

Recording the address information may include recording an address frame obtained by ECC encoding in the link area.

Recording the address information may include recording the address frame in a direction opposite to a direction in which codewords of the address frame are arranged.

Recording the address information may include recording the address frame in a direction opposite to a direction in which codewords of the address frame are arranged in a plurality of address fields provided in the linking area.

In order to achieve the above and/or other aspects of the present invention, there is provided a method of reproducing data from a data storage medium, the method comprising: reading data from a linking area corresponding to an ECC block of a data storage medium storing user data; and At least one of additional information and address information of the linking area is obtained by ECC decoding the read data.

Obtaining at least one of the additional information and the address information includes: adding null data to data of the ECC frame read from the link area; and when an error has occurred in the remaining parity, adding parity to the read ECC frame Adds a random value as the remaining parity and performs error correction on its ECC frame.

In order to achieve the above and/or other aspects of the present invention, there is provided a device for recording data on a data storage medium, the device comprising: an ECC encoder, the encoder is located in the link area of the data storage medium corresponding to ECC encoding of the additional information of at least one ECC block of the data storage medium; and a recorder for recording the ECC encoded additional information in at least one linking area of the data storage medium in a manner of placing the additional information.

The recorder can record ECC-encoded additional information in a plurality of link areas of the data storage medium.

The recorder may record at least a part of the ECC-coded additional information at least once in a plurality of data fields set in one of the link areas.

The ECC encoder can add null data to data indicating additional information, ECC encode the result of the addition, discard the null data, and discard the ECC frame obtained by ECC encoding, and the recorder can record the ECC frame in the linking area.

The recorder may record the ECC frame in a direction opposite to the direction in which the codewords of the ECC frame are arranged.

In order to achieve the above and/or other aspects of the present invention, there is provided an apparatus for reproducing data from a data storage medium, the apparatus comprising: a reader, which extracts data from an ECC block corresponding to the data storage medium storing user data and an ECC decoder that obtains at least one of additional information and address information from the linking area by ECC-decoding the read data.

The ECC decoder adds null data to the data of the ECC frame read from the linking area, and when an error has occurred in the remaining parity, adds a random value to the parity of the read ECC frame as the remaining parity to perform error correction.

Description of drawings

These and/or other aspects and advantages of the present invention will become clearer and easier to understand by carrying out the following description of the embodiments in conjunction with the accompanying drawings, wherein:

1 is a schematic diagram of a device for recording data according to an embodiment of the present invention;

2 is a schematic diagram of an apparatus for reproducing data according to another embodiment of the present invention;

3A to 3C are layout views of an optical disc according to another embodiment of the present invention;

4A to 4C are diagrams showing the data structure of an arbitrary link area #K shown in FIGS. 3A-3C according to the present invention;

5 is a diagram showing a data structure of an ECC frame of an optical disc according to the present invention;

6A is a diagram showing an example of a block obtained by performing second ECC encoding on the ECC frame of FIG. 5 before recording the ECC frame of FIG. 5 on an optical disc or for performing second ECC decoding on the ECC frame of FIG. Diagram of an example of a block;

6B is another example showing blocks obtained by performing second ECC encoding on the ECC frame of FIG. 5 before recording the ECC frame of FIG. 5 on an optical disc or for performing second ECC on the ECC frame of FIG. A diagram of another example of a decoded block;

Figure 7A is a detailed diagram of the codeword in Figure 6A;

Figure 7B is a detailed diagram of the codeword in Figure 6B;

8 is a diagram showing a data structure of an address frame of an optical disc according to the present invention;

9A is a diagram showing an arrangement of additional information recorded in a link area of an optical disc according to the present invention;

9B is a diagram showing an arrangement of address information recorded in a link area of an optical disc according to the present invention;

10A is a diagram showing another arrangement of additional information recorded in a link area of an optical disc according to the present invention; and

FIG. 10B is a diagram showing another arrangement of address information recorded in a link area of an optical disc according to the present invention.

Detailed ways

Embodiments of the invention will now be discussed in detail, examples of which are shown in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

FIG. 1 is a schematic diagram showing an apparatus for recording data according to an embodiment of the present invention. Referring to FIG. 1 , the apparatus includes: a recorder 1 for recording predetermined information in a linking area defined on an optical disc 100 of the present invention; and an ECC encoder 2 .

The ECC encoder 2 performs a first ECC encoding process on user data to be recorded on the optical disc 100 and a second ECC encoding process on predetermined information to be recorded in a linking area of the optical disc 100 . In the first ECC encoding process, user data is encoded under the control of the first error correction system. In the second ECC encoding process, predetermined information to be recorded in the linking area is encoded under the control of the second error correction system. The first and second error correction systems may use the same error correction code or may perform encoding processing by the same operation.

The recorder 1 records user data encoded by the ECC encoder 2 on the optical disc 100 and records predetermined information encoded by the ECC encoder 2 in the link area of the optical disc 100 .

The predetermined information recorded in the link area is classified into, for example, additional information and address information. The additional information includes copyright protection information and information on whether access to a block in which user data is recorded is to be permitted. The address information is, for example, location information for recording or reading data.

For example, the recorder 1 records ECC-encoded additional information in at least one linking area of the optical disc 100 in a manner of placing the additional information. That is, by recording additional information corresponding to at least one ECC block in one linking area from the point of view of the linking area, and at the same time, recording additional information in at least one linking area from the point of view of the additional information, the additional information is written in a predetermined number of number of times or repeated records.

FIG. 2 is a schematic diagram illustrating an apparatus for reproducing data according to another embodiment of the present invention. Referring to FIG. 2 , the device includes a reader 4 and an ECC decoder 5 . The reader 4 reads user data from a main block or an ECC block provided on the optical disc 100 of the present invention or reads predetermined information from a link area of the optical disc 100 and supplies the user data or predetermined information to the ECC decoder 5 . Specifically, the reader 4 reads first ECC-encoded data from the main block or the ECC block and reads second ECC-encoded data from the main block or a plurality of link areas arranged in the ECC block.

The ECC decoder 2 performs ECC decoding processing on user data and predetermined information supplied from the reader 4 and outputs ECC-decoded user data or predetermined information. Specifically, the ECC decoder 2 obtains user data by performing a first ECC decoding process on data read from a main block or an ECC block, and obtains information about the main block by performing a second ECC decoding process on data read from a link area. or the reservation information of the ECC block. The first ECC decoding process is a process for correcting errors using the first error correction system employed for user data, and the second ECC decoding process is a process for correcting errors using the second error correction system employed for predetermined information to be recorded in the linking area to correct errors. The first and second error correction systems may use the same error correction code or may perform error correction processing by the same operation.

Since the optical disc 100 in FIG. 2 has the same data structure as the optical disc 100 shown in FIG. 1 on which data has been recorded, the optical disc 100 in FIG. 2 has the same reference numerals as the optical disc 100 in FIG. 1 . In other words, as a disc having a data structure according to the present invention, the optical disc 100 of FIG. 2 has a linking area, and predetermined information is recorded in the linking area.

The device in FIG. 1 for recording data and the device in FIG. 2 for reproducing data are incorporated in, for example, a disk drive.

3A to 3C are diagrams showing the data structure of the optical disc 100 according to the present invention. Referring to FIG. 3A, these ECC blocks and their corresponding linking areas are alternately arranged on at least one recording layer (not shown) provided on the optical disc 100. Referring to FIG. In the recording space of the optical disc 100, ECC block #1, linking area #1 corresponding to ECC block #1, ECC block #2, and linking area #2 corresponding to ECC block #2 are sequentially arranged. ECC block #K and its corresponding linking area #K are arranged in the same manner. User data is stored in the ECC block, and predetermined information according to the present invention is stored in the linking area. For example, information on the ECC block K# preceding the linking area #K is recorded in any linking area #K.

Referring to FIG. 3B , similar to FIG. 3A , the ECC blocks and their corresponding linking areas are alternately arranged in at least one recording layer (not shown) provided on the optical disc 100 . However, the order of these ECC blocks and their corresponding linking areas is different. That is, the linking area and its corresponding ECC block are sequentially arranged so that the linking area is arranged before the corresponding ECC block. For example, information on the ECC block #K next to the linking area #K is recorded in any linking area #K.

Referring to FIG. 3C, in at least one recording layer (not shown) provided on the optical disc 100, an ECC block is located between its two corresponding linking areas. In other words, linking area #1, ECC block #1, and another linking area #1 are sequentially arranged. Linking area #K, ECC block #K, and another linking area #K are sequentially arranged in the same manner. Hereinafter, the linking area #K may also designate a pair of linking areas corresponding to the ECC block #K which is arranged between the pair of linking areas. For example, information on the corresponding ECC block #K located before or immediately after the linking area #K is recorded in any linking area #K.

4A to 4C are diagrams showing the data structure of an arbitrary link area #K according to the present invention. Referring to FIG. 4A, the linking area #K includes a plurality of frames. A frame sync as data for synchronizing the frame is recorded at one end of each frame, and data fields and address fields are alternately arranged next to the frame sync. In this embodiment, since a data field is arranged at the other end of each frame, the number of data fields is one greater than the number of address fields.

Referring to FIG. 4B, the linking area #K includes a plurality of frames. Frame synchronization, which is data for synchronizing frames, is recorded at one end of each frame. Address fields and data fields are alternately arranged after frame synchronization. Because an address field is placed at the other end of each frame, the number of address fields is one greater than the number of data fields. In addition, data fields and address fields may be alternately arranged after frame synchronization, and this arrangement may end with an address field. In this case, the number of address fields is the same as the number of data fields.

Referring to FIG. 4C, the linking area #K includes a plurality of frames. Frame synchronization, which is data for synchronizing frames, is recorded at one end of each frame. As shown in FIG. 4C, a plurality of address fields and a data field follow a frame sync.

In the arrangement shown in FIGS. 4A and 4B , one ECC frame is obtained by, for example, adding all data recorded in at least one data field. Specifically, an ECC frame is obtained by, for example, adding all or at least part of the data recorded in multiple data fields in one frame, or by adding all the data recorded in multiple data fields in multiple frames Or at least part of the data to get. Therefore, the number of data fields included in one ECC frame may vary. Furthermore, in the arrangement shown in FIG. 4C, one ECC frame is obtained by, for example, adding data recorded in at least a part of the data field. In the arrangements shown in FIGS. 4A to 4C , one address frame is obtained by, for example, adding all or at least a part of data recorded in a plurality of address fields present in one frame. Here, the frames are distinguished based on their frame synchronization.

FIG. 5 is a diagram showing a data structure of an ECC frame according to the present invention. Referring to FIG. 5, the ECC frame includes data with additional information and parity set for error correction. In other words, an ECC frame includes a plurality of codewords, each codeword including data and parity. The number of codewords need not be the same as the number of data fields. That is, the order and length of data allocated to constitute a codeword may vary. Here, codewords are arranged in a column direction, and a direction in which codewords are recorded in a plurality of data fields is a row direction. Since the arrangement direction of the codeword is opposite to the data recording direction, the effect of interleaving ECC frames can be provided. The depth of interleaving for ECC frames is, for example, the same as the number of codewords. When the number of codewords is the same as the number of data fields, the depth of interleaving the ECC frame is the same as the number of data fields.

6A is a diagram showing an example of a block obtained by performing second ECC encoding on the ECC frame of FIG. 5 before recording the ECC frame of FIG. Diagram of an example of a decoded block. Referring to FIG. 6A, for recording data, predetermined dummy data is added to data indicating additional information, and ECC encoding processing is performed on the added result to attach parity to the data and dummy data. Codewords obtained as a result of the ECC encoding process are codewords conforming to Long Distance Coding (LDC), but may be replaced by codewords conforming to other ECC encoding methods including the Reed-Solomon encoding method.

A part of null data and parity is discarded so that an ECC frame according to the present invention can be obtained, and the remaining ECC frame is recorded on the optical disc 100 . In other words, in the present embodiment, dummy data is temporarily appended to data for ECC encoding without being recorded on the optical disc 100 . Only a part of the parity is recorded on the optical disc 100, and the rest is discarded. The discarded part of the parity is called the remaining parity.

One reason for performing ECC encoding after adding null data to data indicating additional information is to make the data compatible with an ECC encoder used to encode user data. In other words, even when the size of the ECC frame is different from the size of the ECC block of user data, ECC encoding can be performed using the ECC encoder for encoding user data by adding null data. Therefore, no additional hardware needs to be introduced.

To reproduce data, null data is added to the data of the ECC frame shown in FIG. 5 read from the optical disc 100, and the remaining parity is added to the parity of the ECC frame. Since the null data is predetermined, the value of the null data is known in the ECC decoding process. A random value instead of parity discarded during data recording is used as the remaining parity. In other words, the remaining parity for decoded data has a different value from the discarded parity for encoded data. Since an error may have occurred in the parity filled with such random values, ECC decoding processing, that is, error correction processing is performed. The error correction processing where the error occurs is an error correction processing in a narrow sense, and the error correction processing to a known location is called an erasing (erase) error correction processing. Therefore, since the position where the error occurred is known, the erasure error correction process is performed on the remaining parity.

6B is another example showing blocks obtained by performing second ECC encoding on the ECC frame of FIG. 5 before recording the ECC frame of FIG. Diagram of another example of two ECC decoded blocks. Referring to FIG. 6B, for recording data, predetermined dummy data is added to data indicating additional information, and an error detection code (EDC) encoding process is performed for each codeword of the added result. Alternatively, EDC encoding processing is performed on each codeword of data indicating additional information, and then predetermined dummy data is added to the result of the EDC encoding processing. In the former case, the EDC code is appended to the sum of null data and data indicating additional information. On the other hand, in the latter case, an EDC code is attached to data indicating additional information. After the EDC encoding process is completed, in other words, the ECC encoding process is performed after the EDC code and null data are added to the data indicating additional information, so that parity is attached to the result of the EDC encoding process. A codeword obtained as a result of the ECC encoding process is a codeword compliant with LDC. However, the obtained codewords can be replaced by codewords following other ECC encoding methods such as the Reed-Solomon encoding method. The codeword obtained as a result of the second encoding is directly recorded on the optical disc 100 . In other words, in the present embodiment, dummy data is appended to data indicating additional information for ECC encoding or EDC encoding, and is also recorded on the optical disc 100 . The parity is also recorded on the optical disc 100 without its discarded parts.

One reason for performing the second ECC encoding after adding null data to data indicating additional information is to make the data compatible with an ECC encoder used to encode user data. In other words, even when the size of the ECC frame is different from the size of the ECC block for user data, ECC encoding can be performed using the ECC encoder for encoding user data by adding null data. Therefore, no additional hardware needs to be introduced.

In order to reproduce data, the second ECC decoding process, ie, error correction process, is performed on the codewords constituting the ECC frame shown in FIG. 6B read from the optical disc 100 . Specifically, ECC decoding processing is performed on the codeword, and then EDC decoding processing is performed on the result of the ECC decoding processing. Alternatively, the ECC decoding process is performed on the codeword, the null data is separated from the result of the ECC decoding, and the EDC decoding process is performed on the result of the ECC decoding from which the null data has been removed. The former case corresponds to an ECC frame having a codeword obtained by appending null data to data to be recorded, performing EDC encoding processing, and then performing ECC encoding processing. The latter case corresponds to an ECC frame having a codeword obtained by performing EDC encoding processing, appending null data to data to be recorded, and performing ECC encoding processing.

Whether or not an error occurs in the second error correction system that completely performs error correction on the codeword can be identified through the EDC decoding process. In general, it is impossible to guarantee that the data obtained after error correction processing is the same as the original data before an error occurs. Therefore, the reliability of data that has undergone error correction can be enhanced by performing EDC encoding processing on the result of error correction.

Figure 7A shows a detailed view of the codeword shown in Figure 6A. Referring to FIG. 7A, the codeword shown in FIG. 6A includes: a null byte, an information byte constituting additional information, a parity byte, and the remaining parity bytes. In this embodiment, the codewords are LDC compliant codewords. However, it should be understood that this codeword may be replaced by a codeword following other ECC encoding methods, such as the Reed-Solomon encoding method. As described above, the dummy bytes and the remaining parity bytes in the codeword are not data recorded on the optical disc 100, but bytes used for ECC encoding or ECC decoding. The information byte and the parity byte are bytes recorded in the data field of the link area of the optical disc 100 . For example, 32 parity bytes are obtained by performing ECC encoding on 16 information bytes to which 200 dummy bytes are added. However, only 16 information bytes and 16 parity bytes are recorded on the optical disc 100, and 200 dummy bytes and 16 remaining parity bytes are discarded. When reproducing data, 16 information bytes and 16 parity bytes are read from the optical disc 100 . Then, 200 dummy data is added to 16 information bytes and 16 parity bytes, and after padding codewords using, for example, random values instead of the remaining parity bytes, error correction processing is performed.

Figure 7B shows a detailed view of the codeword shown in Figure 6B. Referring to FIG. 7B, the codeword shown in FIG. 6B includes: a null byte, an information byte constituting additional information, an EDC byte, and a parity byte. In this embodiment, the codewords are LDC compliant codewords. However, it should be understood that this codeword may be replaced by a codeword following other ECC encoding methods such as the Reed-Solomon encoding method. Null bytes and parity bytes are all recorded on the optical disc 100 as described above with reference to FIG. 6B. For example, 28 information bytes are added to 4 EDC bytes, and 184 dummy bytes are added to the 28 information bytes and 4 EDC bytes. Thereafter, ECC encoding processing is performed to obtain 32 parity bytes.

FIG. 8 shows a diagram showing the data structure of an address frame according to the present invention. FIG. 8 shows an address frame with an interleaving depth of M, 5-byte length data constituting each codeword, and 4-byte length parity. The address frame includes data constituting address information and parity for error correction. In other words, the address frame includes a plurality of address code words, and each address code word includes data and parity. In this embodiment, the number of codewords is the same as the number of address fields. Here, codewords are arranged in a column direction, and a direction in which codewords are recorded in a plurality of data fields is a row direction. Since the direction in which the codewords are arranged is opposite to the data recording direction, the effect of interleaving ECC frames can be provided. Here, the interleaving depth is the same as the number of codewords (the number of data fields) M.

Because the ECC encoder and ECC decoder for address frames are provided separately from the ECC encoder and ECC decoder for user data, address frames are different from ECC frames in that address frames are ECC-encoded and ECC-decoded without enclosing empty data is added to it.

FIG. 9A shows a diagram showing the arrangement of additional information recorded in the link area according to the present invention. Referring to FIG. 9A in which there are ECC block #K, ECC block #K±1, . . . , and their corresponding linking areas #K, #K±1, . The information of K-1, #K-2 and #K-3 is recorded in the data field of the link area #K, the information on the ECC blocks #K-1, #K-2, #K-3 and #K-4 Recorded in the data field of the linking area #K-1, information on the ECC blocks #K+1, #K, #K-1, and #K-2 is recorded in the data field of the linking area #K+1.

In other words, in the present embodiment, additional information on a plurality of ECC blocks is recorded in an arbitrary linking area, and additional information on an arbitrary ECC block is arranged in a plurality of linking areas. Therefore, additional information on predetermined ECC blocks is repeatedly recorded in at least two different linking areas to enhance reliability and robustness of information.

FIG. 9B is a diagram showing the arrangement of address information recorded in the link area according to the present invention. Referring to FIG. 9B in which ECC blocks #K, #K±1, . . . and their corresponding linking areas #K, #K±1, . A predetermined number of times is recorded in the address field of the linking area #K, address information on the ECC block #K-1 is recorded in the address field of the linking area #K-1 a predetermined number of times, and information on the ECC block #K Address information of +1 is recorded in the address field of the link area #K+1 a predetermined number of times.

When the linking area #K is located next to its corresponding ECC block #K as shown in FIG. 3A, addresses of a plurality of ECC blocks are recorded in any linking area immediately before the ECC block. Therefore, the address of the next ECC block can be predicted in advance, so the ECC block can be accessed faster.

When the linking area #K is located before its corresponding ECC block #K as shown in FIG. 3B, addresses of a plurality of ECC blocks are recorded in any linking area next to the ECC block. Therefore, the address of the next ECC block can be predicted in advance, so the ECC block can be accessed faster.

When the linking area #K is located between its corresponding ECC block #K as shown in FIG. 3C, addresses of a plurality of ECC blocks are recorded in the linking area preceding and/or immediately following the ECC block. Therefore, the address of the next ECC block can be predicted in advance, so the ECC block can be accessed faster.

In other words, in this embodiment, address information on an ECC block may be recorded a predetermined number of times in the linking area corresponding to the ECC block to enhance reliability and robustness of the address information.

FIG. 10A is a diagram showing another arrangement of additional information recorded in a link area according to the present invention. Referring to FIG. 10 in which ECC blocks #K, #K±1, . . . and their corresponding linking areas #K, #K±1, . in the data field of a link area. In the embodiment of FIG. 10A, additional information #i is recorded in link areas #K, #K-1, and #K+1. In each link area, there are a plurality of data fields, so additional information #i can be recorded at least once in each data field. The reliability and robustness of information can be enhanced by repeatedly recording the information in the linking area.

In other words, in this embodiment, additional information corresponding to a plurality of ECC blocks is recorded at least once in the linking area corresponding to these ECC blocks. The method of arranging additional information in the link area is suitable for the case of recording information indicating whether restricted access to some ECC blocks is to be permitted when, for example, content unsuitable for minors is recorded; or When promotional discs are provided to people free of charge, some ECC blocks can be viewed free of charge, but the case where passwords are recorded as additional information in a business model where other ECC blocks can be viewed only after, for example, accessing a predetermined website and entering a password obtained in paid exchange .

Furthermore, additional information #K on the ECC block #K is recorded in the linking area #K. In addition, the additional information #K can also be repeatedly recorded once in each of a plurality of data fields present in the link area #K.

FIG. 10B shows a diagram showing another arrangement of address information recorded in a link area according to the present invention. Referring to FIG. 10B in which ECC blocks #K, #K±1, . . . and their corresponding linking areas #K, #K±1, . The address information of K, and #K+1 is recorded in the address field in the linking area #K, and the address information about the ECC blocks #K-2, #K-1, and #K is recorded in the linking area #K- 1, address information on the ECC blocks #K, #K+1, and #K+2 is recorded in the address field of the link area #K+1.

In other words, in the present embodiment, at least a part of address information on a plurality of ECC blocks is recorded in an arbitrary linking area, and address information on an arbitrary ECC block is arranged in a plurality of linking areas. Therefore, address information on a predetermined ECC block is recorded in at least two different linking areas to further enhance the reliability and robustness of the information.

Industrial availability

As described above, according to the present invention, a ROM-type disc can have a data structure that realizes more efficient use of the linking area in terms of obtaining a larger storage space while maintaining its compatibility with recordable disc drives by defining the linking area . In addition, an error correction system is introduced to enhance the reliability of information stored in the link area, and information is repeatedly recorded in the link area to reproduce the information regardless of errors such as fingerprints or scratches. Also, it is possible to record address information on the ECC block in the link area and utilize the address information.

While a few embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined herein. The appended claims and their equivalents are defined.

Claims (20)

1. A method of recording data on a data storage medium, the method comprising: providing a link area on the data storage medium; and recording additional information corresponding to the ECC block in which the user data is stored in the data storage medium in the linking area, Wherein, the step of recording additional information includes: adding null data to the data indicating the additional information, and ECC encoding the addition result; obtaining ECC by discarding the null data and part of the parity obtained by ECC encoding frame; and recording the ECC frame in the linking area. 2. The method of claim 1, wherein: setting a link area includes setting one or more link areas, and Recording additional information includes placing additional information corresponding to at least one ECC block in at least one linking area. 3. The method of claim 1, wherein recording the ECC frame in the linking area comprises recording the ECC frame in a row direction and arranging codewords of the ECC frame in a column direction. 4. The method according to claim 1, wherein recording the ECC frame in the linking area comprises: recording the ECC frame in a plurality of data fields set in one linking area in a row direction, arranging codewords of the ECC frame in a column direction . 5. The method of claim 1, further comprising: recording an address frame obtained through ECC encoding in the link area, the address frame including address information on an ECC block of the data storage medium storing user data. 6. The method of claim 5, wherein: providing a link area includes providing a plurality of link areas; and Recording address information includes placing address information in each link area. 7. The method of claim 5, wherein recording the address information comprises: recording the address frame in a row direction, and arranging code words of the address frame in a column direction. 8. The method of claim 5, wherein recording address information comprises: recording address frames in a plurality of address fields provided in the linking area in a row direction, and arranging code words of the address frames in a column direction. 9. A method of recording data on a data storage medium, the method comprising: providing a link area on a data storage medium; and recording additional information corresponding to the ECC block in which the user data is stored in the data storage medium in the link area, Wherein, the step of recording additional information includes: adding empty data to the data of the additional information, and EDC encoding each codeword of the added result; obtaining the codeword by ECC encoding the result of EDC encoding; and linking Record the codeword on the area. 10. A method of recording data on a data storage medium, the method comprising: providing a link area on a data storage medium; and recording additional information corresponding to the ECC block in which the user data is stored in the data storage medium in the link area, Wherein, the step of recording additional information includes: EDC encoding each codeword of the additional information; adding empty data to the result of EDC encoding of the data; obtaining the codeword by ECC encoding the addition result; and on the linking area Record the codeword. 11. A method of reproducing data from a data storage medium, the method comprising: reading data from a linking area corresponding to an ECC block of a data storage medium storing user data; and obtaining at least one of additional information and address information of the link area by ECC decoding the read data, Wherein, obtaining at least one of the additional information and the address information includes: adding dummy data to the data of the ECC frame read from the link area; and A random value is added to the parity of the read ECC frame as the remaining parity, and error correction is performed on the ECC frame thereof or erasure error correction is performed on the remaining parity. 12. The method of claim 11, wherein the step of performing error correction comprises: Decoding the codeword ECC read from the linking area; and EDC decodes the result of ECC decoding. 13. The method of claim 11, wherein the step of performing error correction comprises: separating null data from codewords read from the linking area by ECC-decoding said codewords; and The resultant EDC of ECC decoding from which null data has been discarded is decoded. 14. A device for recording data on a data storage medium, the device comprising: an ECC encoder configured to ECC-encode additional information corresponding to at least one ECC block of the data storage medium in the linking area of the data storage medium; a recorder for recording ECC-encoded additional information in at least one link area of the data storage medium in accordance with the manner in which the additional information is placed, Wherein, the ECC encoder obtains the ECC frame by adding null data to the data indicating the additional information, ECC-encoding the addition result, discarding the null data, and discarding part of the parity obtained by ECC encoding, and the recorder in the link area records the ECC frame. 15. The apparatus of claim 14, wherein the recorder records the ECC-encoded additional information in a plurality of linking areas of the data storage medium. 16. The apparatus of claim 15, wherein the recorder records at least a part of the ECC-encoded additional information at least once in a plurality of data fields provided in one of the link areas. 17. The apparatus of claim 14, wherein the recorder records the ECC-encoded additional information a predetermined number of times in at least one linking area of the data storage medium. 18. The apparatus according to claim 14, wherein the recorder repeatedly records the ECC-encoded additional information in such a manner that for the linking area, the ECC-encoded additional information is recorded on one linking area, and for the additional information at least Additional information is recorded in a link area. 19. The apparatus of claim 14, wherein the recorder records the ECC frame in a row direction, and arranges codewords of the ECC frame in a column direction. 20. An apparatus for reproducing data on a data storage medium, the apparatus comprising: a reader that reads data from a link area corresponding to an ECC block of a data storage medium storing user data; and an ECC decoder that obtains at least one of additional information and address information from the link area by ECC-decoding the read data, Among them, the ECC decoder performs error correction by adding null data to the data of the ECC frame read from the link area, and adding a random value as the remaining parity to the parity of the read ECC frame.

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